A first version of obimicroasm...

Changes to be committed:
modified: pkg/obiformats/universal_read.go modified: pkg/obioptions/version.go modified: pkg/obiseq/taxonomy_methods.go
2026-03-25 13:30:52 +00:00 · 2025-02-16 21:47:49 +01:00 · 2025-02-12 08:40:38 +01:00 · 2025-02-10 14:05:47 +01:00 · 2025-02-10 11:42:46 +01:00 · 2025-02-05 19:28:19 +01:00
54 changed files with 2442 additions and 4725 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -132,3 +132,4 @@ xxx.gz
 *.sav
 *.old
 ncbitaxo.tgz
+*.csv
--- a/cmd/obitools/obimicroasm/main.go
+++ b/cmd/obitools/obimicroasm/main.go
@@ -0,0 +1,42 @@
+package main
+
+import (
+	"os"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obimicroasm"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+)
+
+func main() {
+
+	// go tool pprof -http=":8000" ./obipairing ./cpu.pprof
+	// f, err := os.Create("cpu.pprof")
+	// if err != nil {
+	// 	log.Fatal(err)
+	// }
+	// pprof.StartCPUProfile(f)
+	// defer pprof.StopCPUProfile()
+
+	// go tool trace cpu.trace
+	// ftrace, err := os.Create("cpu.trace")
+	// if err != nil {
+	// 	log.Fatal(err)
+	// }
+	// trace.Start(ftrace)
+	// defer trace.Stop()
+
+	optionParser := obioptions.GenerateOptionParser(obimicroasm.OptionSet)
+
+	optionParser(os.Args)
+
+	obidefault.SetStrictReadWorker(2)
+	obidefault.SetStrictWriteWorker(2)
+
+	seq := obimicroasm.CLIAssemblePCR()
+
+	println(obiformats.FormatFasta(seq, obiformats.FormatFastSeqJsonHeader))
+	obiutils.WaitForLastPipe()
+}
--- a/cmd/obitools/obitag/main.go
+++ b/cmd/obitools/obitag/main.go
@@ -47,12 +47,27 @@ func main() {
 	obiconvert.OpenSequenceDataErrorMessage(args, err)

 	taxo := obitax.DefaultTaxonomy()
+
+	references := obitag.CLIRefDB()
+
+	if references == nil {
+		log.Panicln("No loaded reference database")
+	}
+
+	if taxo == nil {
+		taxo, err = references.ExtractTaxonomy(nil)
+
+		if err != nil {
+			log.Fatalf("No taxonomy specified or extractable from reference database: %v", err)
+		}
+
+		taxo.SetAsDefault()
+	}
+
 	if taxo == nil {
 		log.Panicln("No loaded taxonomy")
 	}

-	references := obitag.CLIRefDB()
-
 	var identified obiiter.IBioSequence

 	if obitag.CLIGeometricMode() {
--- a/cmd/obitools/obitaxonomy/main.go
+++ b/cmd/obitools/obitaxonomy/main.go
@@ -1,13 +1,16 @@
 package main

 import (
-	"log"
 	"os"

+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obitaxonomy"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+
+	log "github.com/sirupsen/logrus"
 )

 func main() {
@@ -18,17 +21,49 @@ func main() {
 	var iterator *obitax.ITaxon

 	switch {
+	case obitaxonomy.CLIDownloadNCBI():
+		err := obitaxonomy.CLIDownloadNCBITaxdump()
+		if err != nil {
+			log.Errorf("Cannot download NCBI taxonomy: %s", err.Error())
+			os.Exit(1)
+		}
+
+		os.Exit(0)
+
+	case obitaxonomy.CLIExtractTaxonomy():
+		iter, err := obiconvert.CLIReadBioSequences(args...)
+
+		if err != nil {
+			log.Fatalf("Cannot extract taxonomy: %v", err)
+		}
+
+		taxonomy, err := iter.ExtractTaxonomy()
+
+		if err != nil {
+			log.Fatalf("Cannot extract taxonomy: %v", err)
+		}
+
+		taxonomy.SetAsDefault()
+
+		log.Infof("Number of extracted taxa: %d", taxonomy.Len())
+		iterator = taxonomy.AsTaxonSet().Sort().Iterator()

 	case obitaxonomy.CLIDumpSubtaxonomy():
 		iterator = obitaxonomy.CLISubTaxonomyIterator()

 	case obitaxonomy.CLIRequestsPathForTaxid() != "NA":

-		taxon := obitax.DefaultTaxonomy().Taxon(obitaxonomy.CLIRequestsPathForTaxid())
+		taxon, isAlias, err := obitax.DefaultTaxonomy().Taxon(obitaxonomy.CLIRequestsPathForTaxid())

-		if taxon == nil {
-			log.Fatalf("Cannot identify the requested taxon: %s",
-				obitaxonomy.CLIRequestsPathForTaxid())
+		if err != nil {
+			log.Fatalf("Cannot identify the requested taxon: %s (%v)",
+				obitaxonomy.CLIRequestsPathForTaxid(), err)
+		}
+
+		if isAlias {
+			if obidefault.FailOnTaxonomy() {
+				log.Fatalf("Taxon %s is an alias for %s", taxon.String(), taxon.Parent().String())
+			}
 		}

 		s := taxon.Path()
--- a/go.mod
+++ b/go.mod
@@ -14,7 +14,7 @@ require (
 	github.com/rrethy/ahocorasick v1.0.0
 	github.com/schollz/progressbar/v3 v3.13.1
 	github.com/sirupsen/logrus v1.9.3
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.10.0
 	github.com/tevino/abool/v2 v2.1.0
 	github.com/yuin/gopher-lua v1.1.1
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d
@@ -25,13 +25,17 @@ require (

 require (
 	github.com/Clever/csvlint v0.3.0 // indirect
+	github.com/TuftsBCB/io v0.0.0-20140121014543-22b94e9b23f9 // indirect
 	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/ef-ds/deque/v2 v2.0.2 // indirect
 	github.com/goombaio/orderedmap v0.0.0-20180924084748-ba921b7e2419 // indirect
 	github.com/kr/pretty v0.3.0 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rogpeppe/go-internal v1.6.1 // indirect
+	go.etcd.io/bbolt v1.4.0 // indirect
 )

 require (
@@ -45,7 +49,7 @@ require (
 	github.com/shopspring/decimal v1.3.1 // indirect
 	github.com/ulikunitz/xz v0.5.11
 	golang.org/x/net v0.17.0 // indirect
-	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/sys v0.29.0 // indirect
 	golang.org/x/term v0.13.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c
 )
--- a/go.sum
+++ b/go.sum
@@ -6,12 +6,16 @@ github.com/PaesslerAG/gval v1.2.2 h1:Y7iBzhgE09IGTt5QgGQ2IdaYYYOU134YGHBThD+wm9E
 github.com/PaesslerAG/gval v1.2.2/go.mod h1:XRFLwvmkTEdYziLdaCeCa5ImcGVrfQbeNUbVR+C6xac=
 github.com/PaesslerAG/jsonpath v0.1.0 h1:gADYeifvlqK3R3i2cR5B4DGgxLXIPb3TRTH1mGi0jPI=
 github.com/PaesslerAG/jsonpath v0.1.0/go.mod h1:4BzmtoM/PI8fPO4aQGIusjGxGir2BzcV0grWtFzq1Y8=
+github.com/TuftsBCB/io v0.0.0-20140121014543-22b94e9b23f9 h1:Zc1/GNsUpgZR9qm1EmRSKrnOHA7CCd0bIzGdq0cREN0=
+github.com/TuftsBCB/io v0.0.0-20140121014543-22b94e9b23f9/go.mod h1:PZyV4WA3NpqtezSY0h6E6NARAmdDm0qwrydveOyR5Gc=
 github.com/barkimedes/go-deepcopy v0.0.0-20220514131651-17c30cfc62df h1:GSoSVRLoBaFpOOds6QyY1L8AX7uoY+Ln3BHc22W40X0=
 github.com/barkimedes/go-deepcopy v0.0.0-20220514131651-17c30cfc62df/go.mod h1:hiVxq5OP2bUGBRNS3Z/bt/reCLFNbdcST6gISi1fiOM=
 github.com/buger/jsonparser v1.1.1 h1:2PnMjfWD7wBILjqQbt530v576A/cAbQvEW9gGIpYMUs=
 github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
 github.com/chen3feng/stl4go v0.1.1 h1:0L1+mDw7pomftKDruM23f1mA7miavOj6C6MZeadzN2Q=
 github.com/chen3feng/stl4go v0.1.1/go.mod h1:5ml3psLgETJjRJnMbPE+JiHLrCpt+Ajc2weeTECXzWU=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8=
+github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -21,6 +25,8 @@ github.com/dlclark/regexp2 v1.11.4/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cn
 github.com/dsnet/compress v0.0.1 h1:PlZu0n3Tuv04TzpfPbrnI0HW/YwodEXDS+oPKahKF0Q=
 github.com/dsnet/compress v0.0.1/go.mod h1:Aw8dCMJ7RioblQeTqt88akK31OvO8Dhf5JflhBbQEHo=
 github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
+github.com/ef-ds/deque/v2 v2.0.2 h1:GQtDK1boBMu/qsNbSLQsqzwNptaioxZI39X3UxT5ALA=
+github.com/ef-ds/deque/v2 v2.0.2/go.mod h1:hoZy4VooWLhRT4uS+sSCilfgBQUNptJU2FGqr08a5sc=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
 github.com/gabriel-vasile/mimetype v1.4.3/go.mod h1:d8uq/6HKRL6CGdk+aubisF/M5GcPfT7nKyLpA0lbSSk=
 github.com/goccy/go-json v0.10.3 h1:KZ5WoDbxAIgm2HNbYckL0se1fHD6rz5j4ywS6ebzDqA=
@@ -73,6 +79,8 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
 github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 github.com/tevino/abool/v2 v2.1.0 h1:7w+Vf9f/5gmKT4m4qkayb33/92M+Um45F2BkHOR+L/c=
 github.com/tevino/abool/v2 v2.1.0/go.mod h1:+Lmlqk6bHDWHqN1cbxqhwEAwMPXgc8I1SDEamtseuXY=
 github.com/ulikunitz/xz v0.5.6/go.mod h1:2bypXElzHzzJZwzH67Y6wb67pO62Rzfn7BSiF4ABRW8=
@@ -80,6 +88,8 @@ github.com/ulikunitz/xz v0.5.11 h1:kpFauv27b6ynzBNT/Xy+1k+fK4WswhN/6PN5WhFAGw8=
 github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M=
 github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
+go.etcd.io/bbolt v1.4.0 h1:TU77id3TnN/zKr7CO/uk+fBCwF2jGcMuw2B/FMAzYIk=
+go.etcd.io/bbolt v1.4.0/go.mod h1:AsD+OCi/qPN1giOX1aiLAha3o1U8rAz65bvN4j0sRuk=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
 golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
@@ -89,6 +99,8 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
+golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
 golang.org/x/term v0.13.0 h1:bb+I9cTfFazGW51MZqBVmZy7+JEJMouUHTUSKVQLBek=
 golang.org/x/term v0.13.0/go.mod h1:LTmsnFJwVN6bCy1rVCoS+qHT1HhALEFxKncY3WNNh4U=
--- a/go.work.sum
+++ b/go.work.sum
@@ -2,12 +2,9 @@ git.sr.ht/~sbinet/gg v0.3.1 h1:LNhjNn8DerC8f9DHLz6lS0YYul/b602DUxDgGkd/Aik=
 git.sr.ht/~sbinet/gg v0.3.1/go.mod h1:KGYtlADtqsqANL9ueOFkWymvzUvLMQllU5Ixo+8v3pc=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b h1:slYM766cy2nI3BwyRiyQj/Ud48djTMtMebDqepE95rw=
 github.com/ajstarks/svgo v0.0.0-20211024235047-1546f124cd8b/go.mod h1:1KcenG0jGWcpt8ov532z81sp/kMMUG485J2InIOyADM=
-github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
 github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/logex v1.2.0 h1:+eqR0HfOetur4tgnC8ftU5imRnhi4te+BadWS95c5AM=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e h1:fY5BOSpyZCqRo5OhCuC+XN+r/bBCmeuuJtjz+bCNIf8=
-github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 h1:q763qf9huN11kDQavWsoZXJNW3xEE4JJyHa5Q25/sd8=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/chzyer/test v0.0.0-20210722231415-061457976a23 h1:dZ0/VyGgQdVGAss6Ju0dt5P0QltE0SFY5Woh6hbIfiQ=
@@ -29,16 +26,21 @@ github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeN
 github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
 github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
 github.com/ianlancetaylor/demangle v0.0.0-20220319035150-800ac71e25c2 h1:rcanfLhLDA8nozr/K289V1zcntHr3V+SHlXwzz1ZI2g=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213 h1:qGQQKEcAR99REcMpsXCp3lJ03zYT1PkRd3kQGPn9GVg=
 github.com/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
 github.com/kr/pty v1.1.1 h1:VkoXIwSboBpnk99O/KFauAEILuNHv5DVFKZMBN/gUgw=
 github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
 github.com/smallnest/goroutine v1.1.1/go.mod h1:Fp8f6ZReubfdj0m4+NcUnW4IsAqKa+Pnrv9opEiD43E=
+github.com/spf13/cobra v1.8.1/go.mod h1:wHxEcudfqmLYa8iTfL+OuZPbBZkmvliBWKIezN3kD9Y=
+github.com/spf13/pflag v1.0.6/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4=
 github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
 github.com/yuin/goldmark v1.4.13 h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE=
+go.etcd.io/gofail v0.2.0/go.mod h1:nL3ILMGfkXTekKI3clMBNazKnjUZjYLKmBHzsVAnC1o=
 golang.org/x/crypto v0.14.0 h1:wBqGXzWJW6m1XrIKlAH0Hs1JJ7+9KBwnIO8v66Q9cHc=
 golang.org/x/crypto v0.14.0/go.mod h1:MVFd36DqK4CsrnJYDkBA3VC4m2GkXAM0PvzMCn4JQf4=
 golang.org/x/image v0.6.0 h1:bR8b5okrPI3g/gyZakLZHeWxAR8Dn5CyxXv1hLH5g/4=
@@ -46,6 +48,7 @@ golang.org/x/image v0.6.0/go.mod h1:MXLdDR43H7cDJq5GEGXEVeeNhPgi+YYEQ2pC1byI1x0=
 golang.org/x/mod v0.13.0 h1:I/DsJXRlw/8l/0c24sM9yb0T4z9liZTduXvdAWYiysY=
 golang.org/x/mod v0.13.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
 golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4 h1:uVc8UZUe6tr40fFVnUP5Oj+veunVezqYl9z7DYw9xzw=
+golang.org/x/sync v0.10.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/text v0.13.0 h1:ablQoSUd0tRdKxZewP80B+BaqeKJuVhuRxj/dkrun3k=
 golang.org/x/text v0.13.0/go.mod h1:TvPlkZtksWOMsz7fbANvkp4WM8x/WCo/om8BMLbz+aE=
 golang.org/x/tools v0.14.0 h1:jvNa2pY0M4r62jkRQ6RwEZZyPcymeL9XZMLBbV7U2nc=
--- a/pkg/obidefault/taxonomy.go
+++ b/pkg/obidefault/taxonomy.go
@@ -2,6 +2,8 @@ package obidefault

 var __taxonomy__ = ""
 var __alternative_name__ = false
+var __fail_on_taxonomy__ = false
+var __update_taxid__ = false

 func SelectedTaxonomy() string {
 	return __taxonomy__
@@ -30,3 +32,27 @@ func SetSelectedTaxonomy(taxonomy string) {
 func SetAlternativeNamesSelected(alt bool) {
 	__alternative_name__ = alt
 }
+
+func SetFailOnTaxonomy(fail bool) {
+	__fail_on_taxonomy__ = fail
+}
+
+func SetUpdateTaxid(update bool) {
+	__update_taxid__ = update
+}
+
+func FailOnTaxonomyPtr() *bool {
+	return &__fail_on_taxonomy__
+}
+
+func UpdateTaxidPtr() *bool {
+	return &__update_taxid__
+}
+
+func FailOnTaxonomy() bool {
+	return __fail_on_taxonomy__
+}
+
+func UpdateTaxid() bool {
+	return __update_taxid__
+}
--- a/pkg/obiformats/fastseq_json_header.go
+++ b/pkg/obiformats/fastseq_json_header.go
@@ -9,7 +9,6 @@ import (
 	log "github.com/sirupsen/logrus"

 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
-	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 	"github.com/buger/jsonparser"
 )
@@ -201,8 +200,6 @@ func _parse_json_array_interface(str []byte, sequence *obiseq.BioSequence) ([]in
 }

 func _parse_json_header_(header string, sequence *obiseq.BioSequence) string {
-	taxonomy := obitax.DefaultTaxonomy()
-
 	annotations := sequence.Annotations()
 	start := -1
 	stop := -1
@@ -291,13 +288,8 @@ func _parse_json_header_(header string, sequence *obiseq.BioSequence) string {

 			case skey == "taxid":
 				if dataType == jsonparser.Number || dataType == jsonparser.String {
-					taxid := obiutils.UnsafeString(value)
-					taxon := taxonomy.Taxon(taxid)
-					if taxon != nil {
-						sequence.SetTaxon(taxon)
-					} else {
-						sequence.SetTaxid(string(value))
-					}
+					taxid := string(value)
+					sequence.SetTaxid(taxid)
 				} else {
 					log.Fatalf("%s: Cannot parse taxid %s", sequence.Id(), string(value))
 				}
@@ -306,15 +298,7 @@ func _parse_json_header_(header string, sequence *obiseq.BioSequence) string {
 				if dataType == jsonparser.Number || dataType == jsonparser.String {
 					rank, _ := obiutils.SplitInTwo(skey, '_')

-					taxid := obiutils.UnsafeString(value)
-					taxon := taxonomy.Taxon(taxid)
-
-					if taxon != nil {
-						taxid = taxon.String()
-					} else {
-						taxid = string(value)
-					}
-
+					taxid := string(value)
 					sequence.SetTaxid(taxid, rank)
 				} else {
 					log.Fatalf("%s: Cannot parse taxid %s", sequence.Id(), string(value))
--- a/pkg/obiformats/universal_read.go
+++ b/pkg/obiformats/universal_read.go
@@ -72,7 +72,7 @@ func OBIMimeTypeGuesser(stream io.Reader) (*mimetype.MIME, io.Reader, error) {
 	}

 	fastqDetector := func(raw []byte, limit uint32) bool {
-		ok, err := regexp.Match("^@[^ ].*\n[^ ]+\n\\+", raw)
+		ok, err := regexp.Match("^@[^ ].*\n[A-Za-z.-]+", raw)
 		return ok && err == nil
 	}

--- a/pkg/obiiter/extract_taxonomy.go
+++ b/pkg/obiiter/extract_taxonomy.go
@@ -0,0 +1,18 @@
+package obiiter
+
+import "git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+
+func (iterator *IBioSequence) ExtractTaxonomy() (taxonomy *obitax.Taxonomy, err error) {
+
+	for iterator.Next() {
+		slice := iterator.Get().Slice()
+
+		taxonomy, err = slice.ExtractTaxonomy(taxonomy)
+
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}
--- a/pkg/obikmer/debruijn.go
+++ b/pkg/obikmer/debruijn.go
@@ -8,9 +8,12 @@ import (
 	"math/bits"
 	"os"
 	"slices"
+	"sort"

 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obistats"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+	"github.com/ef-ds/deque/v2"
 	log "github.com/sirupsen/logrus"
 )

@@ -89,12 +92,18 @@ type DeBruijnGraph struct {
 //
 //	*DeBruijnGraph - a pointer to the created De Bruijn's Graph
 func MakeDeBruijnGraph(kmersize int) *DeBruijnGraph {
+	if kmersize > 31 {
+		log.Panicf("k-mer size %d is too large", kmersize)
+	}
+
+	kmermask := (^uint64(0) << (uint64(kmersize) * 2))
+
 	g := DeBruijnGraph{
 		kmersize: kmersize,
-		kmermask: ^(^uint64(0) << (uint64(kmersize) * 2)), // k-mer mask used to set to 0 the bits that are not in the k-mer
-		prevc:    uint64(1) << (uint64(kmersize-1) * 2),
-		prevg:    uint64(2) << (uint64(kmersize-1) * 2),
-		prevt:    uint64(3) << (uint64(kmersize-1) * 2),
+		kmermask: kmermask, // k-mer mask used to set to 1 the bits that are not in the k-mer
+		prevc:    (uint64(1) << (uint64(kmersize-1) * 2)) | kmermask,
+		prevg:    (uint64(2) << (uint64(kmersize-1) * 2)) | kmermask,
+		prevt:    (uint64(3) << (uint64(kmersize-1) * 2)) | kmermask,
 		graph:    make(map[uint64]uint),
 	}

@@ -161,19 +170,34 @@ func (g *DeBruijnGraph) FilterMinWeight(min int) {
 	}
 }

+// FilterMinWeight filters the DeBruijnGraph by removing nodes with weight less than the specified minimum.
+//
+// min: an integer representing the minimum count threshold.
+func (g *DeBruijnGraph) FilterMaxWeight(min int) {
+	umin := uint(min)
+	for idx, count := range g.graph {
+		if count > umin {
+			delete(g.graph, idx)
+		}
+	}
+}
+
 func (g *DeBruijnGraph) Previouses(index uint64) []uint64 {
 	if _, ok := g.graph[index]; !ok {
 		log.Panicf("k-mer %s (index %d) is not in graph", g.DecodeNode(index), index)
 	}

 	rep := make([]uint64, 0, 4)
+
+	index &= ^g.kmermask
 	index >>= 2

-	if _, ok := g.graph[index]; ok {
-		rep = append(rep, index)
+	key := index | g.kmermask
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
 	}

-	key := index | g.prevc
+	key = index | g.prevc
 	if _, ok := g.graph[key]; ok {
 		rep = append(rep, key)
 	}
@@ -197,7 +221,7 @@ func (g *DeBruijnGraph) Nexts(index uint64) []uint64 {
 	}

 	rep := make([]uint64, 0, 4)
-	index = (index << 2) & g.kmermask
+	index = (index << 2) | g.kmermask

 	if _, ok := g.graph[index]; ok {
 		rep = append(rep, index)
@@ -268,6 +292,33 @@ func (g *DeBruijnGraph) MaxHead() (uint64, int, bool) {
 	return rep, int(max), found
 }

+func (g *DeBruijnGraph) Terminals() []uint64 {
+	rep := make([]uint64, 0, 10)
+
+	for k := range g.graph {
+		if len(g.Nexts(k)) == 0 {
+			rep = append(rep, k)
+		}
+	}
+
+	return rep
+}
+
+func (g *DeBruijnGraph) MaxTerminal() (uint64, int, bool) {
+	rep := uint64(0)
+	max := uint(0)
+	found := false
+	for k, w := range g.graph {
+		if len(g.Nexts(k)) == 0 && w > max {
+			rep = k
+			max = w
+			found = true
+		}
+	}
+
+	return rep, int(max), found
+}
+
 func (g *DeBruijnGraph) MaxPath() []uint64 {
 	path := make([]uint64, 0, 1000)
 	ok := false
@@ -318,7 +369,11 @@ func (g *DeBruijnGraph) LongestConsensus(id string, min_cov float64) (*obiseq.Bi
 		return nil, fmt.Errorf("graph is empty")
 	}
 	//path := g.LongestPath(max_length)
-	path := g.HaviestPath()
+	path, err := g.HaviestPath(nil, nil, false)
+
+	if err != nil {
+		return nil, err
+	}

 	spath := path

@@ -481,7 +536,7 @@ func (graph *DeBruijnGraph) append(sequence []byte, current uint64, weight int)
 	}

 	current <<= 2
-	current &= graph.kmermask
+	current |= graph.kmermask
 	b := iupac[sequence[0]]
 	current |= b[0]
 	graph.graph[current] = uint(graph.Weight(current) + weight)
@@ -495,6 +550,36 @@ func (graph *DeBruijnGraph) append(sequence []byte, current uint64, weight int)
 	}
 }

+// func (graph *DeBruijnGraph) search(current uint64, extension []byte, path []uint64, error,errormax int) ([]uint64,error) {
+
+// 	path = append(path, current)
+
+// 	if len(extension) == 0 {
+// 		return path,nil
+// 	}
+
+// 	current <<= 2
+// 	current &= graph.kmermask
+// 	b := iupac[extension[0]]
+
+// 	newPath := path
+// 	if len(b) > 1 {
+// 		newPath = slices.Clone(path)
+// 	}
+
+// 	current |= b[0]
+
+// 	_, ok := graph.graph[current]
+// 	if ok {
+// 		newPath = append(newPath, current)
+// 	}
+// 	rep, err := graph.search(current, extension[1:], newPath, error,errormax)
+// 	if err != nil {
+// 		return path,err
+// 	}
+
+// }
+
 // Push appends a BioSequence to the DeBruijnGraph.
 //
 // Parameters:
@@ -523,6 +608,7 @@ func (graph *DeBruijnGraph) Push(sequence *obiseq.BioSequence) {
 				initFirstKmer(start+1, key)
 			}
 		} else {
+			key |= graph.kmermask
 			graph.graph[key] = uint(graph.Weight(key) + w)
 			graph.append(s[graph.kmersize:], key, w)
 		}
@@ -533,6 +619,110 @@ func (graph *DeBruijnGraph) Push(sequence *obiseq.BioSequence) {
 	}
 }

+func (graph *DeBruijnGraph) search(sequence []byte, mismatch, errormax int) []uint64 {
+	var initFirstKmer func(start int, key uint64) []uint64
+
+	initFirstKmer = func(start int, key uint64) []uint64 {
+		if start == graph.kmersize {
+			key |= graph.kmermask
+			if _, ok := graph.graph[key]; ok {
+				return []uint64{key}
+			} else {
+				return []uint64{}
+			}
+		}
+
+		keys := make([]uint64, 0, 1000)
+
+		if start == 0 {
+			key = 0
+		}
+
+		key <<= 2
+		b := iupac[sequence[start]]
+
+		for _, code := range b {
+			key &= ^uint64(3)
+			key |= code
+			keys = append(keys, initFirstKmer(start+1, key)...)
+		}
+
+		// w := []string{}
+		// for _, k := range keys {
+		// 	w = append(w, graph.DecodeNode(k))
+		// }
+		// // log.Warnf("For %s found %d matches : %v", sequence, len(keys), w)
+
+		return keys
+	}
+
+	rep := initFirstKmer(0, 0)
+
+	return rep
+}
+
+func (graph *DeBruijnGraph) Search(sequence *obiseq.BioSequence, errormax int) []uint64 {
+
+	s := sequence.Sequence() // Get the sequence as a byte slice
+
+	if len(s) < graph.KmerSize() {
+		s = slices.Clone(s)
+		for len(s) < graph.KmerSize() {
+			s = append(s, 'n')
+		}
+	}
+
+	log.Warnf("searching for %s", s)
+	keys := graph.search(s, 0, errormax)
+
+	for mismatch := 1; mismatch <= errormax; mismatch++ {
+		log.Warnf("searching with %d error for %s", mismatch, s)
+		for probe := range IterateOneError(s[0:graph.kmersize]) {
+			keys = append(keys,
+				graph.search(probe, mismatch, errormax)...,
+			)
+		}
+	}
+	keys = obiutils.Unique(keys)
+
+	return keys
+}
+
+func (graph *DeBruijnGraph) BackSearch(sequence *obiseq.BioSequence, errormax int) []uint64 {
+	lkmer := graph.KmerSize()
+
+	s := sequence.Sequence() // Get the sequence as a byte slice
+
+	if len(s) < lkmer {
+		sn := []byte{}
+		ls := len(s)
+		for ls < lkmer {
+			sn = append(sn, 'n')
+			ls++
+		}
+		s = append(sn, s...)
+	} else {
+		s = s[(len(s) - lkmer):]
+	}
+
+	log.Warnf("back-searching for %s", s)
+
+	keys := graph.search(s, 0, errormax)
+
+	for mismatch := 1; mismatch <= errormax; mismatch++ {
+		log.Warnf("searching with %d error for %s", mismatch, s)
+		for probe := range IterateOneError(s[0:graph.kmersize]) {
+			// log.Warnf("searching with %d error for %s", mismatch, probe)
+			keys = append(keys,
+				graph.search(probe, mismatch, errormax)...,
+			)
+		}
+	}
+
+	keys = obiutils.Unique(keys)
+	return keys
+}
+
 func (graph *DeBruijnGraph) Gml() string {
 	buffer := bytes.NewBuffer(make([]byte, 0, 1000))

@@ -614,7 +804,7 @@ func (graph *DeBruijnGraph) WriteGml(filename string) error {
 func (g *DeBruijnGraph) HammingDistance(kmer1, kmer2 uint64) int {
 	ident := ^((kmer1 & kmer2) | (^kmer1 & ^kmer2))
 	ident |= (ident >> 1)
-	ident &= 0x5555555555555555 & g.kmermask
+	ident &= 0x5555555555555555 & ^g.kmermask
 	return bits.OnesCount64(ident)
 }

@@ -638,11 +828,23 @@ func (h *UInt64Heap) Pop() any {
 	return x
 }

-func (g *DeBruijnGraph) HaviestPath() []uint64 {
+func (g *DeBruijnGraph) HaviestPath(starts, stops []uint64, backPath bool) ([]uint64, error) {

-	if g.HasCycle() {
-		return nil
+	// if g.HasCycle() {
+	// 	return nil, fmt.Errorf("graph has a cycle")
+	// }
+
+	following := g.Nexts
+
+	if backPath {
+		following = g.Previouses
 	}
+
+	stopNodes := make(map[uint64]bool, len(stops))
+	for _, n := range stops {
+		stopNodes[n] = true
+	}
+
 	// Initialize the distance array and visited set
 	distances := make(map[uint64]int)
 	visited := make(map[uint64]bool)
@@ -654,7 +856,11 @@ func (g *DeBruijnGraph) HaviestPath() []uint64 {
 	heap.Init(queue)

 	startNodes := make(map[uint64]struct{})
-	for _, n := range g.Heads() {
+	if starts == nil {
+		starts = g.Heads()
+	}
+
+	for _, n := range starts {
 		startNodes[n] = struct{}{}
 		heap.Push(queue, n)
 		distances[n] = g.Weight(n)
@@ -686,7 +892,11 @@ func (g *DeBruijnGraph) HaviestPath() []uint64 {
 			log.Warn("current node is 0")
 		}
 		// Update the distance of the neighbors
-		nextNodes := g.Nexts(currentNode)
+
+		nextNodes := following(currentNode)
+		if _, ok := stopNodes[currentNode]; ok {
+			nextNodes = []uint64{}
+		}
 		for _, nextNode := range nextNodes {
 			if nextNode == 0 {
 				log.Warn("next node is 0")
@@ -718,16 +928,178 @@ func (g *DeBruijnGraph) HaviestPath() []uint64 {
 	}

 	if slices.Contains(heaviestPath, currentNode) {
-		log.Panicf("Cycle detected %v -> %v (%v) len(%v), graph: %v", heaviestPath, currentNode, startNodes, len(heaviestPath), g.Len())
-		return nil
+		return nil, fmt.Errorf("cycle detected in heaviest path")
 	}

 	heaviestPath = append(heaviestPath, currentNode)

 	// Reverse the path
-	slices.Reverse(heaviestPath)
+	if !backPath {
+		slices.Reverse(heaviestPath)
+	}

-	return heaviestPath
+	return heaviestPath, nil
+}
+
+func (g *DeBruijnGraph) HaviestPathDSU(starts, stops []uint64, backPath bool) ([]uint64, error) {
+	// Collect and sort edges
+	type Edge struct {
+		weight float64
+		u, v   uint64
+	}
+	edges := make([]Edge, 0)
+
+	// Function to get next nodes (either Nexts or Previouses based on backPath)
+	following := g.Nexts
+	previouses := g.Previouses
+	if backPath {
+		following = g.Previouses
+		previouses = g.Nexts
+	}
+
+	// Collect all edges
+	for u := range g.graph {
+		for _, v := range following(u) {
+			edges = append(edges, Edge{
+				weight: float64(min(g.Weight(u), g.Weight(v))),
+				u:      u,
+				v:      v,
+			})
+		}
+	}
+
+	// Sort edges by weight in descending order
+	sort.Slice(edges, func(i, j int) bool {
+		return edges[i].weight > edges[j].weight
+	})
+
+	// Initialize disjoint set data structure
+	parent := make(map[uint64]uint64)
+	for u := range g.graph {
+		parent[u] = u
+	}
+
+	// Find with path compression
+	var find func(uint64) uint64
+	find = func(node uint64) uint64 {
+		if parent[node] != node {
+			parent[node] = find(parent[node])
+		}
+		return parent[node]
+	}
+
+	// Union function that returns true if cycle is detected
+	union := func(u, v uint64) bool {
+		rootU := find(u)
+		rootV := find(v)
+		if rootU == rootV {
+			return true // Cycle detected
+		}
+		parent[rootV] = rootU
+		return false
+	}
+
+	// If no specific starts provided, use graph heads
+	if starts == nil {
+		if !backPath {
+			starts = g.Heads()
+		} else {
+			starts = g.Terminals()
+		}
+	}
+
+	// If no specific stops provided, use graph terminals
+	if stops == nil {
+		if !backPath {
+			stops = g.Terminals()
+		} else {
+			stops = g.Heads()
+		}
+	}
+
+	// Convert stops to a map for O(1) lookup
+	stopNodes := make(map[uint64]bool)
+	for _, stop := range stops {
+		stopNodes[stop] = false
+	}
+
+	var path []uint64
+	maxCapacity := math.Inf(-1)
+	stopEdge := []Edge{}
+
+	// Process edges in descending order of weight
+	for _, edge := range edges {
+		if stopNodes[edge.u] {
+			continue // Skip edges from stop nodes
+		}
+
+		if in, ok := stopNodes[edge.v]; ok {
+			if !in {
+				stopEdge = append(stopEdge, edge)
+				stopNodes[edge.v] = true
+			}
+		}
+
+		if union(edge.u, edge.v) {
+			continue // Skip if creates cycle
+		}
+
+		pathFound := false
+		for _, sedge := range stopEdge {
+			// Check if any start-stop pair is connected
+			fv := find(sedge.v)
+			for _, s := range starts {
+				fs := find(s)
+				//				log.Warnf("Start: %d, Stop: %d", fs, fv)
+				if fs == fv {
+					pathFound = true
+					maxCapacity = edge.weight
+
+					// Reconstruct path
+					current := sedge.v
+					path = []uint64{current}
+					for current != s {
+						oldcurrent := current
+						//						log.Warnf("Start: %d, Current: %d, Previous: %v", s, current, previouses(current))
+						for _, prev := range previouses(current) {
+							if find(prev) == fs {
+								path = append(path, prev)
+								current = prev
+								break
+							}
+						}
+						if current == oldcurrent {
+							log.Fatalf("We are stuck")
+						}
+
+					}
+					//					log.Warnf("Built path: %v", path)
+					break
+				}
+			}
+			if pathFound {
+				break
+			}
+		}
+		if pathFound {
+			break
+		}
+	}
+
+	//	log.Warnf("Stop edge: %v", stopEdge)
+
+	// Process edges in descending order of weight
+
+	if path == nil {
+		return nil, fmt.Errorf("no valid path found")
+	}
+
+	if !backPath {
+		slices.Reverse(path)
+	}
+	log.Warnf("Max capacity: %5.0f: %v", maxCapacity, g.DecodePath(path))
+
+	return path, nil
 }

 func (g *DeBruijnGraph) HasCycle() bool {
@@ -765,3 +1137,59 @@ func (g *DeBruijnGraph) HasCycle() bool {
 	}
 	return false
 }
+
+// HasCycleInDegree détecte la présence d'un cycle dans le graphe en utilisant la méthode des degrés entrants.
+// Cette méthode est basée sur le tri topologique : si on ne peut pas trier tous les nœuds,
+// alors il y a un cycle.
+//
+// Returns:
+// - bool: true si le graphe contient un cycle, false sinon
+func (g *DeBruijnGraph) HasCycleInDegree() bool {
+	// Créer une map pour stocker les degrés entrants de chaque nœud
+	inDegree := make(map[uint64]int)
+
+	// Initialiser les degrés entrants à 0 pour tous les nœuds
+	for node := range g.graph {
+		inDegree[node] = 0
+	}
+
+	// Calculer les degrés entrants
+	for node := range g.graph {
+		for _, next := range g.Nexts(node) {
+			inDegree[next]++
+		}
+	}
+
+	// Créer une deque pour stocker les nœuds avec un degré entrant de 0
+	queue := deque.Deque[uint64]{}
+
+	// Ajouter tous les nœuds avec un degré entrant de 0 à la deque
+	for node := range g.graph {
+		if inDegree[node] == 0 {
+			queue.PushBack(node)
+		}
+	}
+
+	visited := 0 // Compteur de nœuds visités
+
+	// Parcours BFS
+	for queue.Len() > 0 {
+		// Retirer le premier nœud de la deque
+		node, _ := queue.PopFront()
+		visited++
+
+		// Pour chaque nœud adjacent
+		for _, next := range g.Nexts(node) {
+			// Réduire son degré entrant
+			inDegree[next]--
+
+			// Si le degré entrant devient 0, l'ajouter à la deque
+			if inDegree[next] == 0 {
+				queue.PushBack(next)
+			}
+		}
+	}
+
+	// S'il y a un cycle, on n'aura pas pu visiter tous les nœuds
+	return visited != len(g.graph)
+}
--- a/pkg/obikmer/oneerror.go
+++ b/pkg/obikmer/oneerror.go
@@ -0,0 +1,45 @@
+package obikmer
+
+import (
+	"iter"
+	"slices"
+)
+
+var baseError = map[byte]byte{
+	'a': 'b',
+	'c': 'd',
+	'g': 'h',
+	't': 'v',
+	'r': 'y',
+	'y': 'r',
+	's': 'w',
+	'w': 's',
+	'k': 'm',
+	'm': 'k',
+	'd': 'c',
+	'v': 't',
+	'h': 'g',
+	'b': 'a',
+}
+
+type BytesItem []byte
+
+func IterateOneError(kmer []byte) iter.Seq[BytesItem] {
+	lkmer := len(kmer)
+	return func(yield func(BytesItem) bool) {
+		for p := 0; p < lkmer; p++ {
+			for p < lkmer && kmer[p] == 'n' {
+				p++
+			}
+
+			if p < lkmer {
+				nkmer := slices.Clone(kmer)
+				nkmer[p] = baseError[kmer[p]]
+				if !yield(nkmer) {
+					return
+				}
+			}
+		}
+	}
+
+}
--- a/pkg/obilua/obilib.go
+++ b/pkg/obilua/obilib.go
@@ -4,4 +4,5 @@ import lua "github.com/yuin/gopher-lua"

 func RegisterObilib(luaState *lua.LState) {
 	RegisterObiSeq(luaState)
+	RegisterObiTaxonomy(luaState)
 }
--- a/pkg/obilua/obiseq.go
+++ b/pkg/obilua/obiseq.go
@@ -1,7 +1,9 @@
 package obilua

 import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
 	lua "github.com/yuin/gopher-lua"
 )

@@ -16,6 +18,7 @@ func registerBioSequenceType(luaState *lua.LState) {
 	bioSequenceType := luaState.NewTypeMetatable(luaBioSequenceTypeName)
 	luaState.SetGlobal(luaBioSequenceTypeName, bioSequenceType)
 	luaState.SetField(bioSequenceType, "new", luaState.NewFunction(newObiSeq))
+	luaState.SetField(bioSequenceType, "nil", obiseq2Lua(luaState, nil))

 	luaState.SetField(bioSequenceType, "__index",
 		luaState.SetFuncs(luaState.NewTable(),
@@ -53,6 +56,7 @@ var bioSequenceMethods = map[string]lua.LGFunction{
 	"definition":         bioSequenceGetSetDefinition,
 	"count":              bioSequenceGetSetCount,
 	"taxid":              bioSequenceGetSetTaxid,
+	"taxon":              bioSequenceGetSetTaxon,
 	"attribute":          bioSequenceGetSetAttribute,
 	"len":                bioSequenceGetLength,
 	"has_sequence":       bioSequenceHasSequence,
@@ -62,6 +66,9 @@ var bioSequenceMethods = map[string]lua.LGFunction{
 	"md5_string":         bioSequenceGetMD5String,
 	"subsequence":        bioSequenceGetSubsequence,
 	"reverse_complement": bioSequenceGetRevcomp,
+	"fasta":              bioSequenceGetFasta,
+	"fastq":              bioSequenceGetFastq,
+	"string":             bioSequenceAsString,
 }

 // checkBioSequence checks if the first argument in the Lua stack is a *obiseq.BioSequence.
@@ -254,3 +261,88 @@ func bioSequenceGetRevcomp(luaState *lua.LState) int {
 	luaState.Push(obiseq2Lua(luaState, revcomp))
 	return 1
 }
+
+func bioSequenceGetSetTaxon(luaState *lua.LState) int {
+	s := checkBioSequence(luaState)
+
+	if luaState.GetTop() > 1 {
+		taxon := checkTaxon(luaState, 2)
+
+		s.SetTaxon(taxon)
+
+		return 0
+	}
+
+	taxon := s.Taxon(obitax.DefaultTaxonomy())
+	luaState.Push(taxon2Lua(luaState, taxon))
+
+	return 1
+}
+
+func bioSequenceGetFasta(luaState *lua.LState) int {
+	s := checkBioSequence(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txt := obiformats.FormatFasta(s, formater)
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
+
+func bioSequenceGetFastq(luaState *lua.LState) int {
+	s := checkBioSequence(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txt := obiformats.FormatFastq(s, formater)
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
+
+func bioSequenceAsString(luaState *lua.LState) int {
+	s := checkBioSequence(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+	format := obiformats.FormatFasta
+
+	if s.HasQualities() {
+		format = obiformats.FormatFastq
+	}
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txt := format(s, formater)
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
--- a/pkg/obilua/obiseqslice.go
+++ b/pkg/obilua/obiseqslice.go
@@ -1,6 +1,9 @@
 package obilua

 import (
+	"strings"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
 	lua "github.com/yuin/gopher-lua"
 )
@@ -11,6 +14,7 @@ func registerBioSequenceSliceType(luaState *lua.LState) {
 	bioSequenceSliceType := luaState.NewTypeMetatable(luaBioSequenceSliceTypeName)
 	luaState.SetGlobal(luaBioSequenceSliceTypeName, bioSequenceSliceType)
 	luaState.SetField(bioSequenceSliceType, "new", luaState.NewFunction(newObiSeqSlice))
+	luaState.SetField(bioSequenceSliceType, "nil", obiseqslice2Lua(luaState, nil))

 	luaState.SetField(bioSequenceSliceType, "__index",
 		luaState.SetFuncs(luaState.NewTable(),
@@ -37,6 +41,9 @@ var bioSequenceSliceMethods = map[string]lua.LGFunction{
 	"pop":      bioSequenceSlicePop,
 	"sequence": bioSequenceSliceGetSetSequence,
 	"len":      bioSequenceSliceGetLength,
+	"fasta":    bioSequenceSliceGetFasta,
+	"fastq":    bioSequenceSliceGetFastq,
+	"string":   bioSequenceSliceAsString,
 }

 func checkBioSequenceSlice(L *lua.LState) *obiseq.BioSequenceSlice {
@@ -105,3 +112,96 @@ func bioSequenceSlicePop(luaState *lua.LState) int {
 	return 1

 }
+
+func bioSequenceSliceGetFasta(luaState *lua.LState) int {
+	s := checkBioSequenceSlice(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txts := make([]string, len(*s))
+
+	for i, seq := range *s {
+		txts[i] = obiformats.FormatFasta(seq, formater)
+	}
+
+	txt := strings.Join(txts, "\n")
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
+
+func bioSequenceSliceGetFastq(luaState *lua.LState) int {
+	s := checkBioSequenceSlice(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txts := make([]string, len(*s))
+
+	for i, seq := range *s {
+		txts[i] = obiformats.FormatFastq(seq, formater)
+	}
+
+	txt := strings.Join(txts, "\n")
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
+
+func bioSequenceSliceAsString(luaState *lua.LState) int {
+	s := checkBioSequenceSlice(luaState)
+
+	formater := obiformats.FormatFastSeqJsonHeader
+
+	if luaState.GetTop() > 1 {
+		format := luaState.CheckString(2)
+		switch format {
+		case "json":
+			formater = obiformats.FormatFastSeqJsonHeader
+		case "obi":
+			formater = obiformats.FormatFastSeqOBIHeader
+		}
+	}
+
+	txts := make([]string, len(*s))
+
+	format := obiformats.FormatFasta
+
+	allQual := true
+
+	for _, s := range *s {
+		allQual = allQual && s.HasQualities()
+	}
+
+	if allQual {
+		format = obiformats.FormatFastq
+	}
+
+	for i, seq := range *s {
+		txts[i] = format(seq, formater)
+	}
+
+	txt := strings.Join(txts, "\n")
+
+	luaState.Push(lua.LString(txt))
+	return 1
+}
--- a/pkg/obilua/obitaxon.go
+++ b/pkg/obilua/obitaxon.go
@@ -0,0 +1,139 @@
+package obilua
+
+import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	lua "github.com/yuin/gopher-lua"
+)
+
+const luaTaxonTypeName = "Taxon"
+
+func registerTaxonType(luaState *lua.LState) {
+	taxonType := luaState.NewTypeMetatable(luaTaxonTypeName)
+	luaState.SetGlobal(luaTaxonTypeName, taxonType)
+	luaState.SetField(taxonType, "new", luaState.NewFunction(newTaxon))
+	luaState.SetField(taxonType, "nil", taxonomy2Lua(luaState, nil))
+
+	luaState.SetField(taxonType, "__index",
+		luaState.SetFuncs(luaState.NewTable(),
+			taxonMethods))
+}
+
+func taxon2Lua(interpreter *lua.LState,
+	taxon *obitax.Taxon) lua.LValue {
+	ud := interpreter.NewUserData()
+	ud.Value = taxon
+	interpreter.SetMetatable(ud, interpreter.GetTypeMetatable(luaTaxonTypeName))
+
+	return ud
+}
+
+func newTaxon(luaState *lua.LState) int {
+	taxonomy := checkTaxonomy(luaState)
+	taxid := luaState.CheckString(2)
+	parent := luaState.CheckString(3)
+	sname := luaState.CheckString(4)
+	rank := luaState.CheckString(5)
+
+	isroot := false
+
+	if luaState.GetTop() > 5 {
+		isroot = luaState.CheckBool(6)
+	}
+
+	taxon, err := taxonomy.AddTaxon(taxid, parent, rank, isroot, false)
+
+	if err != nil {
+		luaState.RaiseError("(%v,%v,%v) : Error on taxon creation: %v", taxid, parent, sname, err)
+		return 0
+	}
+
+	taxon.SetName(sname, "scientific name")
+
+	luaState.Push(taxon2Lua(luaState, taxon))
+	return 1
+}
+
+var taxonMethods = map[string]lua.LGFunction{
+	"string":          taxonAsString,
+	"scientific_name": taxonGetSetScientificName,
+	"parent":          taxonGetParent,
+	"taxon_at_rank":   taxGetTaxonAtRank,
+	"species":         taxonGetSpecies,
+	"genus":           taxonGetGenus,
+	"family":          taxonGetFamily,
+}
+
+func checkTaxon(L *lua.LState, i int) *obitax.Taxon {
+	ud := L.CheckUserData(i)
+	if v, ok := ud.Value.(*obitax.Taxon); ok {
+		return v
+	}
+	L.ArgError(i, "obitax.Taxon expected")
+	return nil
+}
+
+func taxonAsString(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+	luaState.Push(lua.LString(taxon.String()))
+	return 1
+}
+
+func taxonGetSetScientificName(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+
+	if luaState.GetTop() > 1 {
+		sname := luaState.CheckString(2)
+		taxon.SetName(sname, "scientific name")
+		return 0
+	}
+
+	luaState.Push(lua.LString(taxon.ScientificName()))
+	return 1
+}
+
+func taxonGetParent(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+
+	parent := taxon.Parent()
+	luaState.Push(taxon2Lua(luaState, parent))
+
+	return 1
+}
+
+func taxonGetSpecies(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+
+	species := taxon.Species()
+	luaState.Push(taxon2Lua(luaState, species))
+
+	return 1
+}
+
+func taxonGetGenus(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+
+	genus := taxon.Genus()
+	luaState.Push(taxon2Lua(luaState, genus))
+
+	return 1
+}
+
+func taxonGetFamily(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+
+	family := taxon.Family()
+	luaState.Push(taxon2Lua(luaState, family))
+
+	return 1
+}
+
+func taxGetTaxonAtRank(luaState *lua.LState) int {
+	taxon := checkTaxon(luaState, 1)
+	rank := luaState.CheckString(2)
+
+	taxonAt := taxon.TaxonAtRank(rank)
+
+	luaState.Push(taxon2Lua(luaState, taxonAt))
+
+	return 1
+}
--- a/pkg/obilua/obitaxonomy.go
+++ b/pkg/obilua/obitaxonomy.go
@@ -0,0 +1,116 @@
+package obilua
+
+import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
+	lua "github.com/yuin/gopher-lua"
+)
+
+func RegisterObiTaxonomy(luaState *lua.LState) {
+	registerTaxonomyType(luaState)
+	registerTaxonType(luaState)
+}
+
+const luaTaxonomyTypeName = "Taxonomy"
+
+func registerTaxonomyType(luaState *lua.LState) {
+	taxonomyType := luaState.NewTypeMetatable(luaTaxonomyTypeName)
+	luaState.SetGlobal(luaTaxonomyTypeName, taxonomyType)
+	luaState.SetField(taxonomyType, "new", luaState.NewFunction(newTaxonomy))
+	luaState.SetField(taxonomyType, "default", luaState.NewFunction(defaultTaxonomy))
+	luaState.SetField(taxonomyType, "has_default", luaState.NewFunction(hasDefaultTaxonomy))
+	luaState.SetField(taxonomyType, "nil", taxon2Lua(luaState, nil))
+	luaState.SetField(taxonomyType, "__index",
+		luaState.SetFuncs(luaState.NewTable(),
+			taxonomyMethods))
+}
+
+func taxonomy2Lua(interpreter *lua.LState,
+	taxonomy *obitax.Taxonomy) lua.LValue {
+	ud := interpreter.NewUserData()
+	ud.Value = taxonomy
+	interpreter.SetMetatable(ud, interpreter.GetTypeMetatable(luaTaxonomyTypeName))
+
+	return ud
+}
+
+func newTaxonomy(luaState *lua.LState) int {
+	name := luaState.CheckString(1)
+	code := luaState.CheckString(2)
+
+	charset := obiutils.AsciiAlphaNumSet
+	if luaState.GetTop() > 2 {
+		charset = obiutils.AsciiSetFromString(luaState.CheckString(3))
+	}
+
+	taxonomy := obitax.NewTaxonomy(name, code, charset)
+
+	luaState.Push(taxonomy2Lua(luaState, taxonomy))
+	return 1
+}
+
+func defaultTaxonomy(luaState *lua.LState) int {
+	taxonomy := obitax.DefaultTaxonomy()
+
+	if taxonomy == nil {
+		luaState.RaiseError("No default taxonomy")
+		return 0
+	}
+
+	luaState.Push(taxonomy2Lua(luaState, taxonomy))
+	return 1
+}
+
+func hasDefaultTaxonomy(luaState *lua.LState) int {
+	taxonomy := obitax.DefaultTaxonomy()
+
+	luaState.Push(lua.LBool(taxonomy != nil))
+	return 1
+}
+
+var taxonomyMethods = map[string]lua.LGFunction{
+	"name":  taxonomyGetName,
+	"code":  taxonomyGetCode,
+	"taxon": taxonomyGetTaxon,
+}
+
+func checkTaxonomy(L *lua.LState) *obitax.Taxonomy {
+	ud := L.CheckUserData(1)
+	if v, ok := ud.Value.(*obitax.Taxonomy); ok {
+		return v
+	}
+	L.ArgError(1, "obitax.Taxonomy expected")
+	return nil
+}
+
+func taxonomyGetName(luaState *lua.LState) int {
+	taxo := checkTaxonomy(luaState)
+	luaState.Push(lua.LString(taxo.Name()))
+	return 1
+}
+
+func taxonomyGetCode(luaState *lua.LState) int {
+	taxo := checkTaxonomy(luaState)
+	luaState.Push(lua.LString(taxo.Code()))
+	return 1
+}
+
+func taxonomyGetTaxon(luaState *lua.LState) int {
+	taxo := checkTaxonomy(luaState)
+	taxid := luaState.CheckString(2)
+	taxon, isAlias, err := taxo.Taxon(taxid)
+
+	if err != nil {
+		luaState.RaiseError("%s : Error on taxon taxon: %v", taxid, err)
+		return 0
+	}
+
+	if isAlias && obidefault.FailOnTaxonomy() {
+		luaState.RaiseError("%s : Taxon is an alias of %s", taxid, taxon.String())
+		return 0
+	}
+
+	luaState.Push(taxon2Lua(luaState, taxon))
+	return 1
+}
--- a/pkg/obioptions/options.go
+++ b/pkg/obioptions/options.go
@@ -66,10 +66,6 @@ func GenerateOptionParser(optionset ...func(*getoptions.GetOpt)) ArgumentParser
 		options.GetEnv("OBISOLEXA"),
 		options.Description("Decodes quality string according to the Solexa specification."))

-	options.BoolVar(obidefault.CompressedPtr(), "compressed", obidefault.CompressOutput(),
-		options.Alias("Z"),
-		options.Description("Compress all the result using gzip"))
-
 	for _, o := range optionset {
 		o(options)
 	}
@@ -181,6 +177,15 @@ func LoadTaxonomyOptionSet(options *getoptions.GetOpt, required, alternatiive bo
 			options.Alias("a"),
 			options.Description("Enable the search on all alternative names and not only scientific names."))
 	}
+
+	options.BoolVar(obidefault.FailOnTaxonomyPtr(), "fail-on-taxonomy",
+		obidefault.FailOnTaxonomy(),
+		options.Description("Make obitools failing on error if a used taxid is not a currently valid one"),
+	)
+
+	options.BoolVar(obidefault.UpdateTaxidPtr(), "update-taxid", obidefault.UpdateTaxid(),
+		options.Description("Make obitools automatically updating the taxid that are declared merged to a newest one."),
+	)
 }

 // CLIIsDebugMode returns whether the CLI is in debug mode.
--- a/pkg/obioptions/version.go
+++ b/pkg/obioptions/version.go
@@ -8,7 +8,7 @@ import (
 // corresponds to the last commit, and not the one when the file will be
 // commited

-var _Commit = "c50a0f4"
+var _Commit = "4774438"
 var _Version = "Release 4.2.0"

 // Version returns the version of the obitools package.
--- a/pkg/obiseq/biosequenceslice.go
+++ b/pkg/obiseq/biosequenceslice.go
@@ -1,6 +1,7 @@
 package obiseq

 import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/exp/slices"
@@ -179,3 +180,18 @@ func (s *BioSequenceSlice) SortOnLength(reverse bool) {
 		}
 	})
 }
+
+func (s *BioSequenceSlice) ExtractTaxonomy(taxonomy *obitax.Taxonomy) (*obitax.Taxonomy, error) {
+	var err error
+
+	for _, s := range *s {
+		taxonomy, err = taxonomy.InsertPathString(s.Path())
+
+		if err != nil {
+			return nil, err
+		}
+
+	}
+
+	return taxonomy, nil
+}
--- a/pkg/obiseq/paired_reads.go
+++ b/pkg/obiseq/paired_reads.go
@@ -25,7 +25,7 @@ func (s *BioSequence) UnPair() {
 }

 func (s *BioSequenceSlice) IsPaired() bool {
-	return (*s)[0].paired != nil
+	return s != nil && s.Len() > 0 && (*s)[0].paired != nil
 }

 func (s *BioSequenceSlice) PairedWith() *BioSequenceSlice {
--- a/pkg/obiseq/taxonomy_lca.go
+++ b/pkg/obiseq/taxonomy_lca.go
@@ -4,6 +4,7 @@ import (
 	"math"
 	"strings"

+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
 	log "github.com/sirupsen/logrus"
 )
@@ -15,13 +16,20 @@ func (sequence *BioSequence) TaxonomicDistribution(taxonomy *obitax.Taxonomy) ma
 	taxonomy = taxonomy.OrDefault(true)

 	for taxid, v := range taxids {
-		t := taxonomy.Taxon(taxid)
-		if t == nil {
+		t, isAlias, err := taxonomy.Taxon(taxid)
+		if err != nil {
 			log.Fatalf(
-				"On sequence %s taxid %s is not defined in taxonomy: %s",
+				"On sequence %s taxid %s is not defined in taxonomy: %s (%v)",
 				sequence.Id(),
 				taxid,
-				taxonomy.Name())
+				taxonomy.Name(),
+				err,
+			)
+		}
+
+		if isAlias && obidefault.FailOnTaxonomy() {
+			log.Fatalf("On sequence %s taxid %s is an alias on %s",
+				sequence.Id(), taxid, t.String())
 		}
 		taxons[t.Node] = v
 	}
--- a/pkg/obiseq/taxonomy_methods.go
+++ b/pkg/obiseq/taxonomy_methods.go
@@ -5,7 +5,9 @@ import (

 	log "github.com/sirupsen/logrus"

+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
 )

 func (s *BioSequence) Taxon(taxonomy *obitax.Taxonomy) *obitax.Taxon {
@@ -14,7 +16,10 @@ func (s *BioSequence) Taxon(taxonomy *obitax.Taxonomy) *obitax.Taxon {
 	if taxid == "NA" {
 		return nil
 	}
-	return taxonomy.Taxon(taxid)
+
+	taxon, _, _ := taxonomy.Taxon(taxid)
+
+	return taxon
 }

 // SetTaxid sets the taxid for the BioSequence.
@@ -23,6 +28,9 @@ func (s *BioSequence) Taxon(taxonomy *obitax.Taxonomy) *obitax.Taxon {
 //
 //	taxid - the taxid to set.
 func (s *BioSequence) SetTaxid(taxid string, rank ...string) {
+	var err error
+	var isAlias bool
+
 	if taxid == "" {
 		taxid = "NA"
 	} else {
@@ -30,11 +38,38 @@ func (s *BioSequence) SetTaxid(taxid string, rank ...string) {
 		taxon := (*obitax.Taxon)(nil)

 		if taxonomy != nil {
-			taxon = taxonomy.Taxon(taxid)
-		}
+			taxon, isAlias, err = taxonomy.Taxon(taxid)
+
+			if err != nil {
+				logger := log.Warnf
+				if obidefault.FailOnTaxonomy() {
+					logger = log.Fatalf
+				}
+				logger("%s: Taxid: %v is unknown from taxonomy (%v)",
+					s.Id(), taxid, err)
+			}
+
+			if isAlias {
+				if obidefault.FailOnTaxonomy() {
+					log.Fatalf("%s: Taxid: %v is an alias from taxonomy (%v) to %s",
+						s.Id(), taxid, taxonomy.Name(), taxon.String())
+				} else {
+					if obidefault.UpdateTaxid() {
+						log.Warnf("%s: Taxid: %v is updated to %s",
+							s.Id(), taxid, taxon.String())
+						taxid = taxon.String()
+					} else {
+						log.Warnf("%s: Taxid %v has to be updated to %s",
+							s.Id(), taxid, taxon.String())
+					}
+				}
+
+			} else {
+				if taxon != nil {
+					taxid = taxon.String()
+				}
+			}

-		if taxon != nil {
-			taxid = taxon.String()
 		}
 	}

@@ -135,14 +170,35 @@ func (sequence *BioSequence) SetFamily(taxonomy *obitax.Taxonomy) *obitax.Taxon
 	return sequence.SetTaxonAtRank(taxonomy, "family")
 }

-func (sequence *BioSequence) SetPath(taxonomy *obitax.Taxonomy) string {
+func (sequence *BioSequence) SetPath(taxonomy *obitax.Taxonomy) []string {
 	taxon := sequence.Taxon(taxonomy)
 	path := taxon.Path()
+	spath := make([]string, path.Len())
+	lpath := path.Len() - 1

-	tpath := path.String()
-	sequence.SetAttribute("taxonomic_path", tpath)
+	for i := lpath; i >= 0; i-- {
+		spath[lpath-i] = path.Get(i).String(taxonomy.Code())
+	}

-	return tpath
+	sequence.SetAttribute("taxonomic_path", spath)
+
+	return spath
+}
+
+func (sequence *BioSequence) Path() []string {
+	path, ok := sequence.GetAttribute("taxonomic_path")
+
+	if !ok {
+		return nil
+	}
+
+	slice, err := obiutils.InterfaceToStringSlice(path)
+
+	if err != nil {
+		log.Fatalf("%s: taxonomic_path has the wrong type (%v)", sequence.Id(), err)
+	}
+
+	return slice
 }

 func (sequence *BioSequence) SetScientificName(taxonomy *obitax.Taxonomy) string {
--- a/pkg/obiseq/taxonomy_predicate.go
+++ b/pkg/obiseq/taxonomy_predicate.go
@@ -63,7 +63,12 @@ func IsSubCladeOfSlot(taxonomy *obitax.Taxonomy, key string) SequencePredicate {
 		val, ok := sequence.GetStringAttribute(key)

 		if ok {
-			parent := taxonomy.Taxon(val)
+			parent, _, err := taxonomy.Taxon(val)
+
+			if err != nil {
+				log.Warnf("%s: %s is unkown from the taxonomy (%v)", sequence.Id(), val, err)
+			}
+
 			taxon := sequence.Taxon(taxonomy)
 			return parent != nil && taxon != nil && taxon.IsSubCladeOf(parent)
 		}
--- a/pkg/obitax/csvtaxdump_write.go
+++ b/pkg/obitax/csvtaxdump_write.go
@@ -1 +1,38 @@
 package obitax
+
+import (
+	"strings"
+
+	"github.com/TuftsBCB/io/newick"
+)
+
+func (taxonomy *Taxonomy) Newick() string {
+	if taxonomy == nil {
+		return ""
+	}
+
+	iterator := taxonomy.AsTaxonSet().Sort().Iterator()
+
+	nodes := make(map[*string]*newick.Tree, taxonomy.Len())
+	trees := make([]*newick.Tree, 0)
+
+	for iterator.Next() {
+		taxon := iterator.Get()
+		tree := &newick.Tree{Label: taxon.String()}
+		nodes[taxon.Node.id] = tree
+		if parent, ok := nodes[taxon.Parent().Node.id]; ok {
+			parent.Children = append(parent.Children, *tree)
+		} else {
+			trees = append(trees, tree)
+		}
+	}
+
+	rep := strings.Builder{}
+
+	for _, tree := range trees {
+		rep.WriteString(tree.String())
+		rep.WriteString("\n")
+	}
+
+	return rep.String()
+}
--- a/pkg/obitax/default_taxonomy.go
+++ b/pkg/obitax/default_taxonomy.go
@@ -1,11 +1,14 @@
 package obitax

 import (
+	"sync"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	log "github.com/sirupsen/logrus"
 )

 var __defaut_taxonomy__ *Taxonomy
+var __defaut_taxonomy_mutex__ sync.Mutex

 func (taxonomy *Taxonomy) SetAsDefault() {
 	log.Infof("Set as default taxonomy %s", taxonomy.Name())
@@ -32,14 +35,18 @@ func DefaultTaxonomy() *Taxonomy {
 	var err error
 	if __defaut_taxonomy__ == nil {
 		if obidefault.HasSelectedTaxonomy() {
-			__defaut_taxonomy__, err = LoadTaxonomy(
-				obidefault.SelectedTaxonomy(),
-				!obidefault.AreAlternativeNamesSelected(),
-			)
+			__defaut_taxonomy_mutex__.Lock()
+			defer __defaut_taxonomy_mutex__.Unlock()
+			if __defaut_taxonomy__ == nil {
+				__defaut_taxonomy__, err = LoadTaxonomy(
+					obidefault.SelectedTaxonomy(),
+					!obidefault.AreAlternativeNamesSelected(),
+				)

-			if err != nil {
-				log.Fatalf("Cannot load default taxonomy: %v", err)
+				if err != nil {
+					log.Fatalf("Cannot load default taxonomy: %v", err)

+				}
 			}
 		}
 	}
--- a/pkg/obitax/iterator.go
+++ b/pkg/obitax/iterator.go
@@ -2,7 +2,6 @@ package obitax

 import (
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
-	log "github.com/sirupsen/logrus"
 )

 // ITaxon represents an iterator for traversing Taxon instances.
@@ -195,7 +194,6 @@ func (taxon *Taxon) ISubTaxonomy() *ITaxon {

 		pushed := true

-		log.Warn(parents)
 		for pushed {
 			itaxo := taxo.Iterator()
 			pushed = false
@@ -218,9 +216,9 @@ func (taxon *Taxon) ISubTaxonomy() *ITaxon {
 }

 func (taxonomy *Taxonomy) ISubTaxonomy(taxid string) *ITaxon {
-	taxon := taxonomy.Taxon(taxid)
+	taxon, _, err := taxonomy.Taxon(taxid)

-	if taxon == nil {
+	if err != nil {
 		return nil
 	}

--- a/pkg/obitax/ncbitaxdump_read.go
+++ b/pkg/obitax/ncbitaxdump_read.go
@@ -91,7 +91,13 @@ func loadNameTable(reader io.Reader, taxonomy *Taxonomy, onlysn bool) int {

 		if !onlysn || classname == "scientific name" {
 			n++
-			taxonomy.Taxon(taxid).SetName(name, classname)
+			taxon, _, err := taxonomy.Taxon(taxid)
+
+			if err != nil {
+				log.Fatalf("%s: is unknown from the taxonomy", taxid)
+			}
+
+			taxon.SetName(name, classname)
 		}
 	}

@@ -125,7 +131,7 @@ func loadMergedTable(reader io.Reader, taxonomy *Taxonomy) int {
 		oldtaxid := strings.TrimSpace(record[0])
 		newtaxid := strings.TrimSpace(record[1])

-		taxonomy.AddAlias(newtaxid, oldtaxid, false)
+		taxonomy.AddAlias(oldtaxid, newtaxid, false)
 	}

 	return n
@@ -196,7 +202,11 @@ func LoadNCBITaxDump(directory string, onlysn bool) (*Taxonomy, error) {
 	n = loadMergedTable(buffered, taxonomy)
 	log.Printf("%d merged taxa read\n", n)

-	root := taxonomy.Taxon("1")
+	root, _, err := taxonomy.Taxon("1")
+
+	if err != nil {
+		log.Fatal("cannot find the root taxon (1) in the NCBI tax dump")
+	}
 	taxonomy.SetRoot(root)

 	return taxonomy, nil
--- a/pkg/obitax/ncbitaxdump_readtar.go
+++ b/pkg/obitax/ncbitaxdump_readtar.go
@@ -134,7 +134,12 @@ func LoadNCBITarTaxDump(path string, onlysn bool) (*Taxonomy, error) {
 	n = loadMergedTable(buffered, taxonomy)
 	log.Printf("%d merged taxa read\n", n)

-	root := taxonomy.Taxon("1")
+	root, _, err := taxonomy.Taxon("1")
+
+	if err != nil {
+		log.Fatal("cannot find the root taxon (1) in the NCBI tax dump")
+	}
+
 	taxonomy.SetRoot(root)

 	return taxonomy, nil
--- a/pkg/obitax/newick_write.go
+++ b/pkg/obitax/newick_write.go
@@ -0,0 +1 @@
+package obitax
--- a/pkg/obitax/string_parser.go
+++ b/pkg/obitax/string_parser.go
@@ -0,0 +1,64 @@
+package obitax
+
+import (
+	"errors"
+	"strings"
+)
+
+// ParseTaxonString parses a string in the format "code:taxid [scientific name]@rank"
+// and returns the individual components. It handles extra whitespace around components.
+//
+// Parameters:
+//   - taxonStr: The string to parse in the format "code:taxid [scientific name]@rank"
+//
+// Returns:
+//   - code: The taxonomy code
+//   - taxid: The taxon identifier
+//   - scientificName: The scientific name (without brackets)
+//   - rank: The rank
+//   - error: An error if the string format is invalid
+func ParseTaxonString(taxonStr string) (code, taxid, scientificName, rank string, err error) {
+	// Trim any leading/trailing whitespace from the entire string
+	taxonStr = strings.TrimSpace(taxonStr)
+
+	// Split by '@' to separate rank
+	parts := strings.Split(taxonStr, "@")
+	if len(parts) > 2 {
+		return "", "", "", "", errors.New("invalid format: multiple '@' characters found")
+	}
+
+	mainPart := strings.TrimSpace(parts[0])
+	if len(parts) == 2 {
+		rank = strings.TrimSpace(parts[1])
+	} else {
+		rank = "no rank"
+	}
+
+	// Find scientific name part (enclosed in square brackets)
+	startBracket := strings.Index(mainPart, "[")
+	endBracket := strings.LastIndex(mainPart, "]")
+
+	if startBracket == -1 || endBracket == -1 || startBracket > endBracket {
+		return "", "", "", "", errors.New("invalid format: scientific name must be enclosed in square brackets")
+	}
+
+	// Extract and clean scientific name
+	scientificName = strings.TrimSpace(mainPart[startBracket+1 : endBracket])
+
+	// Process code:taxid part
+	idPart := strings.TrimSpace(mainPart[:startBracket])
+	idComponents := strings.Split(idPart, ":")
+
+	if len(idComponents) != 2 {
+		return "", "", "", "", errors.New("invalid format: missing taxonomy code separator ':'")
+	}
+
+	code = strings.TrimSpace(idComponents[0])
+	taxid = strings.TrimSpace(idComponents[1])
+
+	if code == "" || taxid == "" || scientificName == "" {
+		return "", "", "", "", errors.New("invalid format: code, taxid and scientific name cannot be empty")
+	}
+
+	return code, taxid, scientificName, rank, nil
+}
--- a/pkg/obitax/taxon.go
+++ b/pkg/obitax/taxon.go
@@ -1,6 +1,7 @@
 package obitax

 import (
+	"errors"
 	"iter"
 	"regexp"

@@ -379,3 +380,29 @@ func (taxon *Taxon) SameAs(other *Taxon) bool {

 	return taxon.Taxonomy == other.Taxonomy && taxon.Node.id == other.Node.id
 }
+
+func (taxon *Taxon) AddChild(child string, replace bool) (*Taxon, error) {
+	if taxon == nil {
+		return nil, errors.New("nil taxon")
+	}
+
+	code, taxid, scientific_name, rank, err := ParseTaxonString(child)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if taxon.Taxonomy.code != code {
+		return nil, errors.New("taxonomy code mismatch")
+	}
+
+	newTaxon, err := taxon.Taxonomy.AddTaxon(taxid, *taxon.Node.id, rank, false, replace)
+
+	if err != nil {
+		return nil, err
+	}
+
+	newTaxon.SetName(scientific_name, "scientific name")
+
+	return newTaxon, nil
+}
--- a/pkg/obitax/taxonomy.go
+++ b/pkg/obitax/taxonomy.go
@@ -12,7 +12,6 @@ import (
 	"fmt"

 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
-	log "github.com/sirupsen/logrus"
 )

 // Taxonomy represents a hierarchical classification of taxa.
@@ -130,27 +129,30 @@ func (taxonomy *Taxonomy) TaxidString(id string) (string, error) {
 // Returns:
 //   - A pointer to the Taxon instance associated with the provided taxid.
 //   - If the taxid is unknown, the method will log a fatal error.
-func (taxonomy *Taxonomy) Taxon(taxid string) *Taxon {
+func (taxonomy *Taxonomy) Taxon(taxid string) (*Taxon, bool, error) {
 	taxonomy = taxonomy.OrDefault(false)
 	if taxonomy == nil {
-		return nil
+		return nil, false, errors.New("cannot extract taxon from nil taxonomy")
 	}

 	id, err := taxonomy.Id(taxid)

 	if err != nil {
-		log.Fatalf("Taxid %s: %v", taxid, err)
+		return nil, false, fmt.Errorf("Taxid %s: %v", taxid, err)
 	}

 	taxon := taxonomy.nodes.Get(id)
+	isAlias := taxon.Node.id != id

 	if taxon == nil {
-		log.Fatalf("Taxid %s is not part of the taxonomy %s",
-			taxid,
-			taxonomy.name)
+		return nil,
+			false,
+			fmt.Errorf("Taxid %s is not part of the taxonomy %s",
+				taxid,
+				taxonomy.name)
 	}

-	return taxon
+	return taxon, isAlias, nil
 }

 // AsTaxonSet returns the set of taxon nodes contained within the Taxonomy.
@@ -353,3 +355,63 @@ func (taxonomy *Taxonomy) HasRoot() bool {
 	taxonomy = taxonomy.OrDefault(false)
 	return taxonomy != nil && taxonomy.root != nil
 }
+
+func (taxonomy *Taxonomy) InsertPathString(path []string) (*Taxonomy, error) {
+	if len(path) == 0 {
+		return nil, errors.New("path is empty")
+	}
+
+	code, taxid, scientific_name, rank, err := ParseTaxonString(path[0])
+
+	if taxonomy == nil {
+		taxonomy = NewTaxonomy(code, code, obiutils.AsciiAlphaNumSet)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	if taxonomy.Len() == 0 {
+
+		if code != taxonomy.code {
+			return nil, fmt.Errorf("cannot insert taxon %s into taxonomy %s with code %s",
+				path[0], taxonomy.name, taxonomy.code)
+		}
+
+		root, err := taxonomy.AddTaxon(taxid, taxid, rank, true, true)
+
+		if err != nil {
+			return nil, err
+		}
+		root.SetName(scientific_name, "scientificName")
+	}
+
+	var current *Taxon
+	current, _, err = taxonomy.Taxon(taxid)
+
+	if err != nil {
+		return nil, err
+	}
+
+	if !current.IsRoot() {
+		return nil, errors.New("path does not start with a root node")
+	}
+
+	for _, id := range path[1:] {
+		taxon, _, err := taxonomy.Taxon(id)
+		if err == nil {
+			if !current.SameAs(taxon.Parent()) {
+				return nil, errors.New("path is not consistent with the taxonomy, parent mismatch")
+			}
+			current = taxon
+		} else {
+			current, err = current.AddChild(id, false)
+
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return taxonomy, nil
+}
--- a/pkg/obitax/taxonset.go
+++ b/pkg/obitax/taxonset.go
@@ -151,7 +151,8 @@ func (set *TaxonSet) Alias(id *string, taxon *Taxon) {
 	if original == nil {
 		log.Fatalf("Original taxon %v is not part of taxon set", id)
 	}
-	set.set[id] = taxon.Node
+
+	set.set[id] = original.Node
 	set.nalias++
 }

@@ -196,3 +197,30 @@ func (set *TaxonSet) Contains(id *string) bool {
 	node := set.Get(id)
 	return node != nil
 }
+
+func (set *TaxonSet) Sort() *TaxonSlice {
+	if set == nil {
+		return nil
+	}
+
+	taxonomy := set.Taxonomy()
+	taxa := taxonomy.NewTaxonSlice(0, set.Len())
+	parent := make(map[*TaxNode]bool, set.Len())
+
+	pushed := true
+
+	for pushed {
+		pushed = false
+		for _, node := range set.set {
+			if !parent[node] && (parent[set.Get(node.parent).Node] ||
+				!set.Contains(node.parent) ||
+				node == taxonomy.Root().Node) {
+				pushed = true
+				taxa.slice = append(taxa.slice, node)
+				parent[node] = true
+			}
+		}
+	}
+
+	return taxa
+}
--- a/pkg/obitools/obiconvert/options.go
+++ b/pkg/obitools/obiconvert/options.go
@@ -3,6 +3,7 @@ package obiconvert
 import (
 	"os"

+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
 	log "github.com/sirupsen/logrus"

@@ -71,16 +72,16 @@ func InputOptionSet(options *getoptions.GetOpt) {

 }

-func OutputModeOptionSet(options *getoptions.GetOpt) {
+func OutputModeOptionSet(options *getoptions.GetOpt, compressed bool) {
 	options.BoolVar(&__no_progress_bar__, "no-progressbar", false,
 		options.Description("Disable the progress bar printing"))

-	options.BoolVar(&__compressed__, "compress", false,
-		options.Alias("Z"),
-		options.Description("Output is compressed"))
+	if compressed {
+		options.BoolVar(obidefault.CompressedPtr(), "compressed", obidefault.CompressOutput(),
+			options.Alias("Z"),
+			options.Description("Compress all the result using gzip"))

-	options.BoolVar(&__skip_empty__, "skip-empty", __skip_empty__,
-		options.Description("Sequences of length equal to zero are suppressed from the output"))
+	}

 	options.StringVar(&__output_file_name__, "out", __output_file_name__,
 		options.Alias("o"),
@@ -90,6 +91,9 @@ func OutputModeOptionSet(options *getoptions.GetOpt) {
 }

 func OutputOptionSet(options *getoptions.GetOpt) {
+	options.BoolVar(&__skip_empty__, "skip-empty", __skip_empty__,
+		options.Description("Sequences of length equal to zero are suppressed from the output"))
+
 	options.BoolVar(&__output_in_fasta__, "fasta-output", false,
 		options.Description("Write sequence in fasta format (default if no quality data available)."))

@@ -105,7 +109,7 @@ func OutputOptionSet(options *getoptions.GetOpt) {
 		options.Alias("O"),
 		options.Description("output FASTA/FASTQ title line annotations follow OBI format."))

-	OutputModeOptionSet(options)
+	OutputModeOptionSet(options, true)
 }

 func PairedFilesOptionSet(options *getoptions.GetOpt) {
@@ -159,10 +163,6 @@ func CLIOutputFormat() string {
 	}
 }

-func CLICompressed() bool {
-	return __compressed__
-}
-
 func CLISkipEmpty() bool {
 	return __skip_empty__
 }
--- a/pkg/obitools/obiconvert/sequence_reader.go
+++ b/pkg/obitools/obiconvert/sequence_reader.go
@@ -55,6 +55,8 @@ func ExpandListOfFiles(check_ext bool, filenames ...string) ([]string, error) {
 						strings.HasSuffix(path, "fasta.gz") ||
 						strings.HasSuffix(path, "fastq") ||
 						strings.HasSuffix(path, "fastq.gz") ||
+						strings.HasSuffix(path, "fq") ||
+						strings.HasSuffix(path, "fq.gz") ||
 						strings.HasSuffix(path, "seq") ||
 						strings.HasSuffix(path, "seq.gz") ||
 						strings.HasSuffix(path, "gb") ||
@@ -140,7 +142,7 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 		}

 		switch CLIInputFormat() {
-		case "fastq":
+		case "fastq", "fq":
 			reader = obiformats.ReadFastqFromFile
 		case "fasta":
 			reader = obiformats.ReadFastaFromFile
@@ -168,22 +170,25 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 				opts...,
 			)
 		} else {
-			iterator, err = reader(list_of_files[0], opts...)
-
-			if err != nil {
-				return obiiter.NilIBioSequence, err
-			}
-
-			if CLIPairedFileName() != "" {
-				ip, err := reader(CLIPairedFileName(), opts...)
+			if len(list_of_files) > 0 {
+				iterator, err = reader(list_of_files[0], opts...)

 				if err != nil {
 					return obiiter.NilIBioSequence, err
 				}

-				iterator = iterator.PairTo(ip)
-			}
+				if CLIPairedFileName() != "" {
+					ip, err := reader(CLIPairedFileName(), opts...)

+					if err != nil {
+						return obiiter.NilIBioSequence, err
+					}
+
+					iterator = iterator.PairTo(ip)
+				}
+			} else {
+				iterator = obiiter.NilIBioSequence
+			}
 		}

 	}
--- a/pkg/obitools/obiconvert/sequence_writer.go
+++ b/pkg/obitools/obiconvert/sequence_writer.go
@@ -58,7 +58,7 @@ func CLIWriteBioSequences(iterator obiiter.IBioSequence,
 	opts = append(opts, obiformats.OptionsParallelWorkers(nworkers))
 	opts = append(opts, obiformats.OptionsBatchSize(obidefault.BatchSize()))

-	opts = append(opts, obiformats.OptionsCompressed(CLICompressed()))
+	opts = append(opts, obiformats.OptionsCompressed(obidefault.CompressOutput()))

 	var err error

--- a/pkg/obitools/obicsv/obicsv.go
+++ b/pkg/obitools/obicsv/obicsv.go
@@ -33,6 +33,7 @@ func CLIWriteSequenceCSV(iterator obiiter.IBioSequence,
 		CSVDefinition(CLIPrintDefinition()),
 		CSVKeys(CLIToBeKeptAttributes()),
 		CSVSequence(CLIPrintSequence()),
+		CSVQuality(CLIPrintQuality()),
 		CSVAutoColumn(CLIAutoColumns()),
 	)

--- a/pkg/obitools/obicsv/options.go
+++ b/pkg/obitools/obicsv/options.go
@@ -66,7 +66,7 @@ func CSVOptionSet(options *getoptions.GetOpt) {

 func OptionSet(options *getoptions.GetOpt) {
 	obiconvert.InputOptionSet(options)
-	obiconvert.OutputModeOptionSet(options)
+	obiconvert.OutputModeOptionSet(options, true)
 	obioptions.LoadTaxonomyOptionSet(options, false, false)
 	CSVOptionSet(options)
 }
--- a/pkg/obitools/obicsv/sequence.go
+++ b/pkg/obitools/obicsv/sequence.go
@@ -40,7 +40,7 @@ func CSVSequenceHeader(opt Options) obiitercsv.CSVHeader {
 	}

 	if opt.CSVQuality() {
-		record.AppendField("quality")
+		record.AppendField("qualities")
 	}

 	return record
@@ -100,9 +100,9 @@ func CSVBatchFromSequences(batch obiiter.BioSequenceBatch, opt Options) obiiterc
 				for j := 0; j < l; j++ {
 					ascii[j] = uint8(q[j]) + uint8(quality_shift)
 				}
-				record["quality"] = string(ascii)
+				record["qualities"] = string(ascii)
 			} else {
-				record["quality"] = opt.CSVNAValue()
+				record["qualities"] = opt.CSVNAValue()
 			}
 		}

--- a/pkg/obitools/obidistribute/distribute.go
+++ b/pkg/obitools/obidistribute/distribute.go
@@ -33,7 +33,7 @@ func CLIDistributeSequence(sequences obiiter.IBioSequence) {
 	opts = append(opts, obiformats.OptionsParallelWorkers(nworkers),
 		obiformats.OptionsBatchSize(obidefault.BatchSize()),
 		obiformats.OptionsAppendFile(CLIAppendSequences()),
-		obiformats.OptionsCompressed(obiconvert.CLICompressed()))
+		obiformats.OptionsCompressed(obidefault.CompressOutput()))

 	var formater obiformats.SequenceBatchWriterToFile

--- a/pkg/obitools/obigrep/options.go
+++ b/pkg/obitools/obigrep/options.go
@@ -248,15 +248,15 @@ func CLIRestrictTaxonomyPredicate() obiseq.SequencePredicate {
 	if len(_BelongTaxa) > 0 {
 		taxonomy := obitax.DefaultTaxonomy()

-		taxon := taxonomy.Taxon(_BelongTaxa[0])
-		if taxon == nil {
+		taxon, _, err := taxonomy.Taxon(_BelongTaxa[0])
+		if err != nil {
 			p = obiseq.IsSubCladeOfSlot(taxonomy, _BelongTaxa[0])
 		} else {
 			p = obiseq.IsSubCladeOf(taxonomy, taxon)
 		}
 		for _, staxid := range _BelongTaxa[1:] {
-			taxon := taxonomy.Taxon(staxid)
-			if taxon == nil {
+			taxon, _, err := taxonomy.Taxon(staxid)
+			if err != nil {
 				p2 = obiseq.IsSubCladeOfSlot(taxonomy, staxid)
 			} else {
 				p2 = obiseq.IsSubCladeOf(taxonomy, taxon)
@@ -278,16 +278,16 @@ func CLIAvoidTaxonomyPredicate() obiseq.SequencePredicate {
 	if len(_NotBelongTaxa) > 0 {
 		taxonomy := obitax.DefaultTaxonomy()

-		taxon := taxonomy.Taxon(_NotBelongTaxa[0])
-		if taxon == nil {
+		taxon, _, err := taxonomy.Taxon(_NotBelongTaxa[0])
+		if err != nil {
 			p = obiseq.IsSubCladeOfSlot(taxonomy, _NotBelongTaxa[0])
 		} else {
 			p = obiseq.IsSubCladeOf(taxonomy, taxon)
 		}

 		for _, taxid := range _NotBelongTaxa[1:] {
-			taxon := taxonomy.Taxon(taxid)
-			if taxon == nil {
+			taxon, _, err := taxonomy.Taxon(taxid)
+			if err != nil {
 				p2 = obiseq.IsSubCladeOfSlot(taxonomy, taxid)
 			} else {
 				p2 = obiseq.IsSubCladeOf(taxonomy, taxon)
--- a/pkg/obitools/obimicroasm/microasm.go
+++ b/pkg/obitools/obimicroasm/microasm.go
@@ -0,0 +1,520 @@
+package obimicroasm
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"slices"
+
+	log "github.com/sirupsen/logrus"
+
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiapat"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obikmer"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obisuffix"
+)
+
+func BuildFilterOnPatternReadPairWorker(
+	forward, reverse string,
+	errormax int,
+	cutReads bool,
+) obiseq.SeqWorker {
+	forwardPatternDir, err := obiapat.MakeApatPattern(forward, errormax, false)
+
+	if err != nil {
+		log.Fatalf("Cannot compile forward primer %s : %v", forward, err)
+	}
+
+	reverse_rev := obiseq.NewBioSequence("fp", []byte(reverse), "").ReverseComplement(true).String()
+	reveresePatternRev, err := obiapat.MakeApatPattern(reverse_rev, errormax, false)
+
+	if err != nil {
+		log.Fatalf("Cannot compile reverse complement reverse primer %s : %v", reverse, err)
+	}
+
+	matchRead := func(sequence *obiseq.BioSequence) *obiseq.BioSequence {
+		var aseq obiapat.ApatSequence
+		var err error
+		var read, match *obiseq.BioSequence
+
+		aseq, err = obiapat.MakeApatSequence(sequence, false)
+
+		if err != nil {
+			log.Fatalf("Cannot prepare apat sequence from %s : %v", sequence.Id(), err)
+		}
+
+		start, end, nerr, matched := forwardPatternDir.BestMatch(aseq, 0, aseq.Len())
+
+		if matched {
+			read = sequence
+
+			if cutReads {
+				read, err = sequence.Subsequence(start, sequence.Len(), false)
+
+				if err != nil {
+					log.Fatalf("Cannot cut, on forward, forward read %s [%d,%d] : %v",
+						sequence.Id(), start, sequence.Len(), err)
+				}
+			}
+
+			read.SetAttribute("forward_primer", forward)
+			match, _ = sequence.Subsequence(start, end, false)
+			read.SetAttribute("forward_match", match.String())
+			read.SetAttribute("forward_error", nerr)
+
+			aseq, err = obiapat.MakeApatSequence(read, false, aseq)
+
+			if err != nil {
+				log.Fatalf("Cannot prepare apat sequence from %s : %v", sequence.Id(), err)
+			}
+
+			start, end, nerr, matched = reveresePatternRev.BestMatch(aseq, 0, aseq.Len())
+
+			if matched {
+
+				frread := read
+
+				if cutReads {
+					frread, err = read.Subsequence(0, end, false)
+
+					if err != nil {
+						log.Fatalf("Cannot xxx cut, on reverse, forward read %s [%d,%d] : %v",
+							sequence.Id(), start, read.Len(), err)
+					}
+				}
+
+				frread.SetAttribute("reverse_primer", reverse)
+				match, _ = read.Subsequence(start, end, false)
+				frread.SetAttribute("reverse_match", match.ReverseComplement(true).String())
+				frread.SetAttribute("reverse_error", nerr)
+
+				read = frread
+				//				log.Warnf("Forward-Reverse primer matched on %s : %d\n%s", read.Id(), read.Len(),
+				//					obiformats.FormatFasta(read, obiformats.FormatFastSeqJsonHeader))
+			}
+
+		} else {
+			start, end, nerr, matched = reveresePatternRev.BestMatch(aseq, 0, aseq.Len())
+
+			if matched {
+				read = sequence
+				if cutReads {
+					read, err = sequence.Subsequence(0, end, false)
+
+					if err != nil {
+						log.Fatalf("Cannot yyy cut, on reverse, forward read %s [%d,%d] : %v",
+							sequence.Id(), 0, end, err)
+					}
+
+				}
+
+				read.SetAttribute("reverse_primer", reverse)
+				match, _ = read.Subsequence(start, end, false)
+				read.SetAttribute("reverse_match", match.ReverseComplement(true).String())
+				read.SetAttribute("reverse_error", nerr)
+			} else {
+				read = nil
+			}
+
+		}
+
+		return read
+	}
+
+	w := func(sequence *obiseq.BioSequence) (result obiseq.BioSequenceSlice, err error) {
+		result = obiseq.MakeBioSequenceSlice()
+
+		paired := sequence.PairedWith()
+		sequence.UnPair()
+
+		read := matchRead(sequence)
+
+		if read == nil {
+			sequence = sequence.ReverseComplement(true)
+			read = matchRead(sequence)
+		}
+
+		if read != nil {
+			result = append(result, read)
+		}
+
+		if paired != nil {
+			read = matchRead(paired)
+
+			if read == nil {
+				read = matchRead(paired.ReverseComplement(true))
+			}
+
+			if read != nil {
+				result = append(result, read)
+			}
+		}
+
+		return
+	}
+
+	return w
+}
+
+func ExtractOnPatterns(iter obiiter.IBioSequence,
+	forward, reverse string,
+	errormax int,
+	cutReads bool,
+) obiseq.BioSequenceSlice {
+
+	matched := iter.MakeIWorker(
+		BuildFilterOnPatternReadPairWorker(forward, reverse, errormax, cutReads),
+		false,
+	)
+
+	rep := obiseq.MakeBioSequenceSlice()
+
+	for matched.Next() {
+		frgs := matched.Get()
+		rep = append(rep, frgs.Slice()...)
+	}
+
+	return rep
+}
+
+func BuildPCRProduct(seqs obiseq.BioSequenceSlice,
+	consensus_id string,
+	kmer_size int,
+	forward, reverse string,
+	backtrack bool,
+	save_graph bool, dirname string) (*obiseq.BioSequence, error) {
+
+	from := obiseq.NewBioSequence("forward", []byte(forward), "")
+	to := obiseq.NewBioSequence("reverse", []byte(CLIReversePrimer()), "").ReverseComplement(true)
+
+	if backtrack {
+		from, to = to, from
+	}
+
+	if seqs.Len() == 0 {
+		return nil, fmt.Errorf("no sequence provided")
+	}
+
+	if save_graph {
+		if dirname == "" {
+			dirname = "."
+		}
+
+		if stat, err := os.Stat(dirname); err != nil || !stat.IsDir() {
+			// path does not exist or is not directory
+			os.RemoveAll(dirname)
+			err := os.Mkdir(dirname, 0755)
+
+			if err != nil {
+				log.Panicf("Cannot create directory %s for saving graphs", dirname)
+			}
+		}
+
+		fasta, err := os.Create(path.Join(dirname, fmt.Sprintf("%s_consensus.fasta", consensus_id)))
+
+		if err == nil {
+			defer fasta.Close()
+			fasta.Write(obiformats.FormatFastaBatch(obiiter.MakeBioSequenceBatch(
+				fmt.Sprintf("%s_consensus", consensus_id),
+				0,
+				seqs,
+			),
+				obiformats.FormatFastSeqJsonHeader, false).Bytes())
+			fasta.Close()
+		}
+
+	}
+
+	log.Debugf("Number of reads : %d\n", len(seqs))
+
+	if kmer_size < 0 {
+		longest := make([]int, len(seqs))
+
+		for i, seq := range seqs {
+			s := obiseq.BioSequenceSlice{seq}
+			sa := obisuffix.BuildSuffixArray(&s)
+			longest[i] = slices.Max(sa.CommonSuffix())
+		}
+
+		// spectrum := map[int]int{}
+		// for _, s := range longest {
+		// 	spectrum[s]++
+		// }
+
+		// log.Warnf("spectum kmer size : %v", spectrum)
+
+		kmer_size = slices.Max(longest) + 1
+		log.Infof("estimated kmer size : %d", kmer_size)
+	}
+
+	var graph *obikmer.DeBruijnGraph
+
+	var hp []uint64
+	var err error
+	var starts []uint64
+	var stops []uint64
+
+	for {
+		graph = obikmer.MakeDeBruijnGraph(kmer_size)
+
+		for _, s := range seqs {
+			graph.Push(s)
+		}
+
+		if !backtrack {
+			starts = graph.Search(from, CLIAllowedMismatch())
+			stops = graph.BackSearch(to, CLIAllowedMismatch())
+		} else {
+			starts = graph.BackSearch(from, CLIAllowedMismatch())
+			stops = graph.Search(to, CLIAllowedMismatch())
+		}
+
+		log.Infof("Found %d starts", len(starts))
+		pweight := map[int]int{}
+		for _, s := range starts {
+			w := graph.Weight(s)
+			pweight[w]++
+			log.Warnf("Starts : %s (%d)\n", graph.DecodeNode(s), w)
+		}
+
+		log.Infof("Found %d stops", len(stops))
+		for _, s := range stops {
+			w := graph.Weight(s)
+			pweight[w]++
+			log.Warnf("Stop : %s (%d)\n", graph.DecodeNode(s), w)
+		}
+
+		log.Infof("Weight spectrum : %v", pweight)
+
+		wmax := 0
+		sw := 0
+		for w := range pweight {
+			sw += w
+			if w > wmax {
+				wmax = w
+			}
+		}
+
+		graph.FilterMinWeight(int(sw / len(pweight)))
+		graph.FilterMaxWeight(int(wmax * 2))
+
+		log.Infof("Minimum coverage : %d", int(sw/len(pweight)))
+		log.Infof("Maximum coverage : %d", int(wmax*2))
+
+		if !graph.HasCycleInDegree() {
+			break
+		}
+
+		kmer_size++
+
+		if kmer_size > 31 {
+			break
+		}
+
+		SetKmerSize(kmer_size)
+		log.Warnf("Cycle detected, increasing kmer size to %d\n", kmer_size)
+	}
+
+	if !backtrack {
+		starts = graph.Search(from, CLIAllowedMismatch())
+		stops = graph.BackSearch(to, CLIAllowedMismatch())
+	} else {
+		starts = graph.BackSearch(from, CLIAllowedMismatch())
+		stops = graph.Search(to, CLIAllowedMismatch())
+	}
+
+	hp, err = graph.HaviestPath(starts, stops, backtrack)
+
+	log.Debugf("Graph size : %d\n", graph.Len())
+
+	maxw := graph.MaxWeight()
+	modew := graph.WeightMode()
+	meanw := graph.WeightMean()
+	specw := graph.WeightSpectrum()
+	kmer := graph.KmerSize()
+
+	log.Warnf("Weigh mode: %d Weigth mean : %4.1f Weigth max : %d, kmer = %d", modew, meanw, maxw, kmer)
+	log.Warn(specw)
+
+	if save_graph {
+
+		file, err := os.Create(path.Join(dirname,
+			fmt.Sprintf("%s_consensus.gml", consensus_id)))
+
+		if err != nil {
+			fmt.Println(err)
+		} else {
+			file.WriteString(graph.Gml())
+			file.Close()
+		}
+	}
+
+	if err == nil {
+		s := graph.DecodePath(hp)
+
+		seq := obiseq.NewBioSequence(consensus_id, []byte(s), "")
+
+		total_kmer := graph.Len()
+		sumCount := 0
+
+		if seq != nil {
+			for _, s := range seqs {
+				sumCount += s.Count()
+			}
+			seq.SetAttribute("obiconsensus_consensus", true)
+			seq.SetAttribute("obiconsensus_weight", sumCount)
+			seq.SetAttribute("obiconsensus_seq_length", seq.Len())
+			seq.SetAttribute("obiconsensus_kmer_size", kmer_size)
+			seq.SetAttribute("obiconsensus_kmer_max_occur", graph.MaxWeight())
+			seq.SetAttribute("obiconsensus_filtered_graph_size", graph.Len())
+			seq.SetAttribute("obiconsensus_full_graph_size", total_kmer)
+		}
+
+		log.Warnf("Consensus sequence : \n%s", obiformats.FormatFasta(seq, obiformats.FormatFastSeqJsonHeader))
+
+		return seq, nil
+
+	}
+
+	return nil, err
+}
+
+func CLIAssemblePCR() *obiseq.BioSequence {
+
+	pairs, err := CLIPairedSequence()
+
+	if err != nil {
+		log.Errorf("Cannot open file (%v)", err)
+		os.Exit(1)
+	}
+
+	matched := ExtractOnPatterns(pairs,
+		CLIForwardPrimer(),
+		CLIReversePrimer(),
+		CLIAllowedMismatch(),
+		true,
+	)
+
+	seq, err := BuildPCRProduct(
+		matched,
+		CLIGraphFilesDirectory(),
+		CLIKmerSize(),
+		CLIForwardPrimer(),
+		CLIReversePrimer(),
+		false,
+		CLISaveGraphToFiles(),
+		CLIGraphFilesDirectory())
+
+	if err != nil {
+		log.Fatalf("Cannot build the consensus sequence : %v", err)
+
+	}
+
+	forwardPatternDir, err := obiapat.MakeApatPattern(
+		CLIForwardPrimer(),
+		CLIAllowedMismatch(),
+		false)
+
+	if err != nil {
+		log.Fatalf("Cannot compile forward primer %s : %v", CLIForwardPrimer(), err)
+	}
+
+	reverse_rev := obiseq.NewBioSequence("fp", []byte(CLIReversePrimer()), "").ReverseComplement(true).String()
+	reveresePatternRev, err := obiapat.MakeApatPattern(reverse_rev, CLIAllowedMismatch(), false)
+
+	if err != nil {
+		log.Fatalf("Cannot compile reverse complement reverse primer %s : %v", CLIReversePrimer(), err)
+	}
+
+	aseq, err := obiapat.MakeApatSequence(seq, false)
+
+	if err != nil {
+		log.Fatalf("Cannot build apat sequence: %v", err)
+	}
+
+	fstart, fend, fnerr, hasfw := forwardPatternDir.BestMatch(aseq, 0, aseq.Len())
+	rstart, rend, rnerr, hasrev := reveresePatternRev.BestMatch(aseq, 0, aseq.Len())
+
+	for hasfw && !hasrev {
+		var rseq *obiseq.BioSequence
+		rseq, err = BuildPCRProduct(
+			matched,
+			CLIGraphFilesDirectory(),
+			CLIKmerSize(),
+			CLIForwardPrimer(),
+			CLIReversePrimer(),
+			true,
+			CLISaveGraphToFiles(),
+			CLIGraphFilesDirectory())
+
+		if err != nil {
+			log.Fatalf("Cannot build Reverse PCR sequence: %v", err)
+		}
+
+		kmerSize, _ := seq.GetIntAttribute("obiconsensus_kmer_size")
+		fp, _ := seq.Subsequence(seq.Len()-kmerSize, seq.Len(), false)
+		rp, _ := rseq.Subsequence(0, kmerSize, false)
+		rp = rp.ReverseComplement(true)
+
+		pairs, err := CLIPairedSequence()
+
+		if err != nil {
+			log.Errorf("Cannot open file (%v)", err)
+			os.Exit(1)
+		}
+
+		nmatched := ExtractOnPatterns(pairs,
+			fp.String(),
+			rp.String(),
+			CLIAllowedMismatch(),
+			true,
+		)
+
+		in := map[string]bool{}
+
+		for _, s := range matched {
+			in[s.String()] = true
+		}
+
+		for _, s := range nmatched {
+			if !in[s.String()] {
+				matched = append(matched, s)
+			}
+		}
+
+		seq, err = BuildPCRProduct(
+			matched,
+			CLIGraphFilesDirectory(),
+			CLIKmerSize(),
+			CLIForwardPrimer(),
+			CLIReversePrimer(),
+			false,
+			CLISaveGraphToFiles(),
+			CLIGraphFilesDirectory())
+
+		aseq, err := obiapat.MakeApatSequence(seq, false)
+
+		if err != nil {
+			log.Fatalf("Cannot build apat sequence: %v", err)
+		}
+		fstart, fend, fnerr, hasfw = forwardPatternDir.BestMatch(aseq, 0, aseq.Len())
+		rstart, rend, rnerr, hasrev = reveresePatternRev.BestMatch(aseq, 0, aseq.Len())
+
+	}
+
+	marker, _ := seq.Subsequence(fstart, rend, false)
+
+	marker.SetAttribute("forward_primer", CLIForwardPrimer())
+	match, _ := seq.Subsequence(fstart, fend, false)
+	marker.SetAttribute("forward_match", match.String())
+	marker.SetAttribute("forward_error", fnerr)
+
+	marker.SetAttribute("reverse_primer", CLIReversePrimer())
+	match, _ = seq.Subsequence(rstart, rend, false)
+	marker.SetAttribute("reverse_match", match.ReverseComplement(true).String())
+	marker.SetAttribute("reverse_error", rnerr)
+
+	return marker
+}
--- a/pkg/obitools/obimicroasm/options.go
+++ b/pkg/obitools/obimicroasm/options.go
@@ -0,0 +1,139 @@
+package obimicroasm
+
+import (
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiapat"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
+	"github.com/DavidGamba/go-getoptions"
+	log "github.com/sirupsen/logrus"
+)
+
+var _ForwardFile = ""
+var _ReverseFile = ""
+var _ForwardPrimer string
+var _ReversePrimer string
+var _AllowedMismatch = 0
+var _kmerSize = -1
+
+var _saveGraph = "__@@NOSAVE@@__"
+
+func MicroAsmOptionSet(options *getoptions.GetOpt) {
+	options.StringVar(&_ForwardFile, "forward-reads", "",
+		options.Alias("F"),
+		options.ArgName("FILENAME_F"),
+		options.Required("You must provide at a forward file"),
+		options.Description("The file names containing the forward reads"))
+	options.StringVar(&_ReverseFile, "reverse-reads", "",
+		options.Alias("R"),
+		options.ArgName("FILENAME_R"),
+		options.Required("You must provide a reverse file"),
+		options.Description("The file names containing the reverse reads"))
+	options.StringVar(&_ForwardPrimer, "forward", "",
+		options.Required("You must provide a forward primer"),
+		options.Description("The forward primer used for the electronic PCR."))
+
+	options.StringVar(&_ReversePrimer, "reverse", "",
+		options.Required("You must provide a reverse primer"),
+		options.Description("The reverse primer used for the electronic PCR."))
+
+	options.IntVar(&_AllowedMismatch, "allowed-mismatches", 0,
+		options.Alias("e"),
+		options.Description("Maximum number of mismatches allowed for each primer."))
+	options.IntVar(&_kmerSize, "kmer-size", _kmerSize,
+		options.ArgName("SIZE"),
+		options.Description("The size of the kmer used to build the consensus. "+
+			"Default value = -1, which means that the kmer size is estimated from the data"),
+	)
+
+	options.StringVar(&_saveGraph, "save-graph", _saveGraph,
+		options.Description("Creates a directory containing the set of DAG used by the obiclean clustering algorithm. "+
+			"The graph files follow the graphml format."),
+	)
+
+}
+
+func OptionSet(options *getoptions.GetOpt) {
+	obiconvert.OptionSet(options)
+	MicroAsmOptionSet(options)
+}
+
+// CLIForwardPrimer returns the sequence of the forward primer as indicated by the
+// --forward command line option
+func CLIForwardPrimer() string {
+	pattern, err := obiapat.MakeApatPattern(_ForwardPrimer, _AllowedMismatch, false)
+
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	pattern.Free()
+
+	return _ForwardPrimer
+}
+
+// CLIReversePrimer returns the sequence of the reverse primer as indicated by the
+// --reverse command line option
+func CLIReversePrimer() string {
+	pattern, err := obiapat.MakeApatPattern(_ReversePrimer, _AllowedMismatch, false)
+
+	if err != nil {
+		log.Fatalf("%+v", err)
+	}
+
+	pattern.Free()
+
+	return _ReversePrimer
+}
+
+// CLIAllowedMismatch returns the allowed mistmatch count between each
+// primer and the sequences as indicated by the
+// --allowed-mismatches|-e command line option
+func CLIAllowedMismatch() int {
+	return _AllowedMismatch
+}
+
+func CLIPairedSequence() (obiiter.IBioSequence, error) {
+	forward, err := obiconvert.CLIReadBioSequences(_ForwardFile)
+	if err != nil {
+		return obiiter.NilIBioSequence, err
+	}
+
+	reverse, err := obiconvert.CLIReadBioSequences(_ReverseFile)
+	if err != nil {
+		return obiiter.NilIBioSequence, err
+	}
+
+	paired := forward.PairTo(reverse)
+
+	return paired, nil
+}
+
+func CLIForwardFile() string {
+	return _ForwardFile
+}
+
+// Returns true it the obliclean graphs must be saved
+func CLISaveGraphToFiles() bool {
+	return _saveGraph != "__@@NOSAVE@@__"
+}
+
+// It returns the directory where the graph files are saved
+func CLIGraphFilesDirectory() string {
+	return _saveGraph
+}
+
+// CLIKmerSize returns the value of the kmer size to use for building the consensus.
+//
+// The value of the kmer size is set by the user with the `-k` flag.
+// The value -1 means that the kmer size is estimated as the minimum value that
+// insure that no kmer are present more than one time in a sequence.
+//
+// No parameters.
+// Returns an integer value.
+func CLIKmerSize() int {
+	return _kmerSize
+}
+
+func SetKmerSize(kmerSize int) {
+	_kmerSize = kmerSize
+}
--- a/pkg/obitools/obitag/obitag.go
+++ b/pkg/obitools/obitag/obitag.go
@@ -42,9 +42,10 @@ func MatchDistanceIndex(taxonomy *obitax.Taxonomy, distance int, distanceIdx map
 	if i == len(keys) || distance > keys[len(keys)-1] {
 		taxon = taxonomy.Root()
 	} else {
-		taxon = taxonomy.Taxon(distanceIdx[keys[i]])
-		if taxon == nil {
-			log.Panicf("Cannot identify taxon %s in %s", distanceIdx[keys[i]], taxonomy.Name())
+		var err error
+		taxon, _, err = taxonomy.Taxon(distanceIdx[keys[i]])
+		if err != nil {
+			log.Panicf("Cannot identify taxon %s in %s (%v)", distanceIdx[keys[i]], taxonomy.Name(), err)
 		}
 	}

@@ -196,9 +197,9 @@ func Identify(sequence *obiseq.BioSequence,
 				log.Panic("Problem in identification line : ", best.Id(), "idx:", idx, "distance:", d)
 			}

-			match_taxon := taxo.Taxon(identification)
+			match_taxon, _, err := taxo.Taxon(identification)

-			if taxon != nil {
+			if err == nil {
 				taxon, _ = taxon.LCA(match_taxon)
 			} else {
 				taxon = match_taxon
--- a/pkg/obitools/obitag/options.go
+++ b/pkg/obitools/obitag/options.go
@@ -6,7 +6,6 @@ import (
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiformats"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiiter"
-	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiseq"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"
@@ -43,7 +42,6 @@ func TagOptionSet(options *getoptions.GetOpt) {
 // the obiuniq command
 func OptionSet(options *getoptions.GetOpt) {
 	obiconvert.OptionSet(options)
-	obioptions.LoadTaxonomyOptionSet(options, true, false)
 	TagOptionSet(options)
 }

--- a/pkg/obitools/obitaxonomy/obitaxonomy.go
+++ b/pkg/obitools/obitaxonomy/obitaxonomy.go
@@ -1,10 +1,15 @@
 package obitaxonomy

 import (
+	"fmt"
+	"time"
+
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obidefault"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiitercsv"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obicsv"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obiutils"

 	log "github.com/sirupsen/logrus"
 )
@@ -73,3 +78,18 @@ func CLICSVTaxaIterator(iterator *obitax.ITaxon) *obiitercsv.ICSVRecord {
 func CLICSVTaxaWriter(iterator *obitax.ITaxon, terminalAction bool) *obiitercsv.ICSVRecord {
 	return obicsv.CLICSVWriter(CLICSVTaxaIterator(iterator), terminalAction)
 }
+
+func CLIDownloadNCBITaxdump() error {
+	now := time.Now()
+	dateStr := now.Format("20060102") // In Go, this specific date is used as reference for formatting
+
+	filename := fmt.Sprintf("ncbitaxo_%s.tgz", dateStr)
+
+	if obiconvert.CLIOutPutFileName() != "-" {
+		filename = obiconvert.CLIOutPutFileName()
+	}
+
+	log.Infof("Downloading NCBI Taxdump to %s", filename)
+	return obiutils.DownloadFile("https://ftp.ncbi.nlm.nih.gov/pub/taxonomy/taxdump.tar.gz", filename)
+
+}
--- a/pkg/obitools/obitaxonomy/options.go
+++ b/pkg/obitools/obitaxonomy/options.go
@@ -5,6 +5,7 @@ import (

 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obioptions"
 	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitax"
+	"git.metabarcoding.org/obitools/obitools4/obitools4/pkg/obitools/obiconvert"
 	"github.com/DavidGamba/go-getoptions"
 )

@@ -22,6 +23,8 @@ var __taxid_path__ = "NA"
 var __taxid_sons__ = "NA"
 var __restrict_rank__ = ""
 var __to_dump__ = ""
+var __download_ncbi__ = false
+var __extract_taxonomy__ = false

 func FilterTaxonomyOptionSet(options *getoptions.GetOpt) {
 	options.BoolVar(&__rank_list__, "rank-list", false,
@@ -34,7 +37,8 @@ func FilterTaxonomyOptionSet(options *getoptions.GetOpt) {
 }

 func OptionSet(options *getoptions.GetOpt) {
-	obioptions.LoadTaxonomyOptionSet(options, true, true)
+	obioptions.LoadTaxonomyOptionSet(options, false, true)
+	obiconvert.OutputModeOptionSet(options, false)
 	FilterTaxonomyOptionSet(options)
 	options.BoolVar(&__fixed_pattern__, "fixed", false,
 		options.Alias("F"),
@@ -70,6 +74,12 @@ func OptionSet(options *getoptions.GetOpt) {
 		options.ArgName("TAXID"),
 		options.Description("Dump a sub-taxonomy corresponding to the precised clade"),
 	)
+	options.BoolVar(&__download_ncbi__, "download-ncbi", __download_ncbi__,
+		options.Description("Download the current NCBI taxonomy taxdump"),
+	)
+	options.BoolVar(&__extract_taxonomy__, "extract-taxonomy", __extract_taxonomy__,
+		options.Description("Extract taxonomy from a sequence file"),
+	)
 }

 func CLITaxonomicalRestrictions() (*obitax.TaxonSet, error) {
@@ -81,13 +91,14 @@ func CLITaxonomicalRestrictions() (*obitax.TaxonSet, error) {

 	ts := taxonomy.NewTaxonSet()
 	for _, taxid := range __taxonomical_restriction__ {
-		tx := taxonomy.Taxon(taxid)
+		tx, _, err := taxonomy.Taxon(taxid)

-		if tx == nil {
+		if err != nil {
 			return nil, fmt.Errorf(
-				"cannot find taxon %s in taxonomy %s",
+				"cannot find taxon %s in taxonomy %s (%v)",
 				taxid,
 				taxonomy.Name(),
+				err,
 			)
 		}

@@ -144,3 +155,11 @@ func CLIDumpSubtaxonomy() bool {
 func CLISubTaxonomyNode() string {
 	return __to_dump__
 }
+
+func CLIDownloadNCBI() bool {
+	return __download_ncbi__
+}
+
+func CLIExtractTaxonomy() bool {
+	return __extract_taxonomy__
+}
--- a/pkg/obiutils/cast_interface.go
+++ b/pkg/obiutils/cast_interface.go
@@ -93,3 +93,145 @@ func MapToMapInterface(m interface{}) map[string]interface{} {
 	log.Panic("Invalid map type")
 	return make(map[string]interface{})
 }
+
+// InterfaceToInt converts a interface{} to an integer value if possible.
+// If not a "NotAnInteger" error is returned via the err
+// return value and val is set to 0.
+func InterfaceToInt(i interface{}) (val int, err error) {
+
+	err = nil
+	val = 0
+
+	switch t := i.(type) {
+	case int:
+		val = t
+	case int8:
+		val = int(t) // standardizes across systems
+	case int16:
+		val = int(t) // standardizes across systems
+	case int32:
+		val = int(t) // standardizes across systems
+	case int64:
+		val = int(t) // standardizes across systems
+	case float32:
+		val = int(t) // standardizes across systems
+	case float64:
+		val = int(t) // standardizes across systems
+	case uint8:
+		val = int(t) // standardizes across systems
+	case uint16:
+		val = int(t) // standardizes across systems
+	case uint32:
+		val = int(t) // standardizes across systems
+	case uint64:
+		val = int(t) // standardizes across systems
+	default:
+		err = &NotAnInteger{"value attribute cannot be casted to an integer"}
+	}
+	return
+}
+
+// InterfaceToInt converts a interface{} to an integer value if possible.
+// If not a "NotAnInteger" error is returned via the err
+// return value and val is set to 0.
+func InterfaceToFloat64(i interface{}) (val float64, err error) {
+
+	err = nil
+	val = 0
+
+	switch t := i.(type) {
+	case int:
+		val = float64(t)
+	case int8:
+		val = float64(t) // standardizes across systems
+	case int16:
+		val = float64(t) // standardizes across systems
+	case int32:
+		val = float64(t) // standardizes across systems
+	case int64:
+		val = float64(t) // standardizes across systems
+	case float32:
+		val = float64(t) // standardizes across systems
+	case float64:
+		val = t // standardizes across systems
+	case uint8:
+		val = float64(t) // standardizes across systems
+	case uint16:
+		val = float64(t) // standardizes across systems
+	case uint32:
+		val = float64(t) // standardizes across systems
+	case uint64:
+		val = float64(t) // standardizes across systems
+	default:
+		err = &NotAnFloat64{"value attribute cannot be casted to a float value"}
+	}
+	return
+}
+
+func InterfaceToIntMap(i interface{}) (val map[string]int, err error) {
+	err = nil
+
+	switch i := i.(type) {
+	case map[string]int:
+		val = i
+	case map[string]interface{}:
+		val = make(map[string]int, len(i))
+		for k, v := range i {
+			val[k], err = InterfaceToInt(v)
+			if err != nil {
+				return
+			}
+		}
+	case map[string]float64:
+		val = make(map[string]int, len(i))
+		for k, v := range i {
+			val[k] = int(v)
+		}
+	default:
+		err = &NotAMapInt{"value attribute cannot be casted to a map[string]int"}
+	}
+
+	return
+}
+
+func InterfaceToStringMap(i interface{}) (val map[string]string, err error) {
+	err = nil
+
+	switch i := i.(type) {
+	case map[string]string:
+		val = i
+	case map[string]interface{}:
+		val = make(map[string]string, len(i))
+		for k, v := range i {
+			val[k], err = InterfaceToString(v)
+			if err != nil {
+				return
+			}
+		}
+	default:
+		err = &NotAMapInt{"value attribute cannot be casted to a map[string]int"}
+	}
+
+	return
+}
+
+func InterfaceToStringSlice(i interface{}) (val []string, err error) {
+	err = nil
+
+	switch i := i.(type) {
+	case []string:
+		val = i
+	case []interface{}:
+		val = make([]string, len(i))
+		for k, v := range i {
+			val[k], err = InterfaceToString(v)
+			if err != nil {
+				return
+			}
+		}
+	default:
+		err = &NotAMapInt{"value attribute cannot be casted to a []string"}
+	}
+
+	return
+}
--- a/pkg/obiutils/download.go
+++ b/pkg/obiutils/download.go
@@ -0,0 +1,45 @@
+package obiutils
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+
+	"github.com/schollz/progressbar/v3"
+)
+
+func DownloadFile(url string, filepath string) error {
+	// Get the data
+	resp, err := http.Get(url)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	// Check server response
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("bad status: %s", resp.Status)
+	}
+
+	// Create the file
+	out, err := os.Create(filepath)
+	if err != nil {
+		return err
+	}
+	defer out.Close()
+
+	// Create progress bar
+	bar := progressbar.DefaultBytes(
+		resp.ContentLength,
+		"downloading",
+	)
+
+	// Write the body to file while updating the progress bar
+	_, err = io.Copy(io.MultiWriter(out, bar), resp.Body)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
--- a/pkg/obiutils/goutils.go
+++ b/pkg/obiutils/goutils.go
@@ -25,43 +25,6 @@ func (m *NotAnInteger) Error() string {
 	return m.message
 }

-// InterfaceToInt converts a interface{} to an integer value if possible.
-// If not a "NotAnInteger" error is returned via the err
-// return value and val is set to 0.
-func InterfaceToInt(i interface{}) (val int, err error) {
-
-	err = nil
-	val = 0
-
-	switch t := i.(type) {
-	case int:
-		val = t
-	case int8:
-		val = int(t) // standardizes across systems
-	case int16:
-		val = int(t) // standardizes across systems
-	case int32:
-		val = int(t) // standardizes across systems
-	case int64:
-		val = int(t) // standardizes across systems
-	case float32:
-		val = int(t) // standardizes across systems
-	case float64:
-		val = int(t) // standardizes across systems
-	case uint8:
-		val = int(t) // standardizes across systems
-	case uint16:
-		val = int(t) // standardizes across systems
-	case uint32:
-		val = int(t) // standardizes across systems
-	case uint64:
-		val = int(t) // standardizes across systems
-	default:
-		err = &NotAnInteger{"value attribute cannot be casted to an integer"}
-	}
-	return
-}
-
 // NotAnInteger defines a new type of Error : "NotAnInteger"
 type NotAnFloat64 struct {
 	message string
@@ -74,43 +37,6 @@ func (m *NotAnFloat64) Error() string {
 	return m.message
 }

-// InterfaceToInt converts a interface{} to an integer value if possible.
-// If not a "NotAnInteger" error is returned via the err
-// return value and val is set to 0.
-func InterfaceToFloat64(i interface{}) (val float64, err error) {
-
-	err = nil
-	val = 0
-
-	switch t := i.(type) {
-	case int:
-		val = float64(t)
-	case int8:
-		val = float64(t) // standardizes across systems
-	case int16:
-		val = float64(t) // standardizes across systems
-	case int32:
-		val = float64(t) // standardizes across systems
-	case int64:
-		val = float64(t) // standardizes across systems
-	case float32:
-		val = float64(t) // standardizes across systems
-	case float64:
-		val = t // standardizes across systems
-	case uint8:
-		val = float64(t) // standardizes across systems
-	case uint16:
-		val = float64(t) // standardizes across systems
-	case uint32:
-		val = float64(t) // standardizes across systems
-	case uint64:
-		val = float64(t) // standardizes across systems
-	default:
-		err = &NotAnFloat64{"value attribute cannot be casted to a float value"}
-	}
-	return
-}
-
 // NotABoolean defines a new type of Error : "NotAMapInt"
 type NotAMapInt struct {
 	message string
@@ -123,53 +49,6 @@ func (m *NotAMapInt) Error() string {
 	return m.message
 }

-func InterfaceToIntMap(i interface{}) (val map[string]int, err error) {
-	err = nil
-
-	switch i := i.(type) {
-	case map[string]int:
-		val = i
-	case map[string]interface{}:
-		val = make(map[string]int, len(i))
-		for k, v := range i {
-			val[k], err = InterfaceToInt(v)
-			if err != nil {
-				return
-			}
-		}
-	case map[string]float64:
-		val = make(map[string]int, len(i))
-		for k, v := range i {
-			val[k] = int(v)
-		}
-	default:
-		err = &NotAMapInt{"value attribute cannot be casted to a map[string]int"}
-	}
-
-	return
-}
-
-func InterfaceToStringMap(i interface{}) (val map[string]string, err error) {
-	err = nil
-
-	switch i := i.(type) {
-	case map[string]string:
-		val = i
-	case map[string]interface{}:
-		val = make(map[string]string, len(i))
-		for k, v := range i {
-			val[k], err = InterfaceToString(v)
-			if err != nil {
-				return
-			}
-		}
-	default:
-		err = &NotAMapInt{"value attribute cannot be casted to a map[string]int"}
-	}
-
-	return
-}
-
 // NotABoolean defines a new type of Error : "NotAMapInt"
 type NotAMapFloat64 struct {
 	message string
--- a/pkg/obiutils/unique.go
+++ b/pkg/obiutils/unique.go
@@ -0,0 +1,20 @@
+package obiutils
+
+// Unique returns a new slice containing only unique values from the input slice.
+// The order of elements in the output slice is not guaranteed to match the input order.
+//
+// Parameters:
+// - slice: The input slice containing potentially duplicate values
+//
+// Returns:
+// - A new slice containing only unique values
+func Unique[T comparable](slice []T) []T {
+	// Create a map to track unique values
+	seen := Set[T]{}
+
+	for _, v := range slice {
+		seen.Add(v)
+	}
+
+	return seen.Members()
+}
--- a/xxx.csv
+++ b/xxx.csv
Author	SHA1	Message	Date
Eric Coissac	d70b0a5b42	A first version of obimicroasm...	2025-02-16 21:47:49 +01:00
Eric Coissac	4774438644	Changes to be committed: modified: pkg/obiformats/universal_read.go modified: pkg/obioptions/version.go modified: pkg/obiseq/taxonomy_methods.go	2025-02-12 08:40:38 +01:00
Eric Coissac	6a8061cc4f	Add managment of the taxonomy alias politic	2025-02-10 14:05:47 +01:00
Eric Coissac	e2563cd8df	Patch a bug in registering merged taxa	2025-02-10 11:42:46 +01:00
Eric Coissac	f2e81adf95	Changes to be committed: modified: .gitignore deleted: xxx.csv	2025-02-05 19:28:19 +01:00
Eric Coissac	f27e9bc91e	patch a bug related to csv and qualities	2025-02-05 19:27:00 +01:00
Eric Coissac	773e54965d	Patch a bug on compressed output	2025-02-05 14:18:24 +01:00
Eric Coissac	ceca33998b	add extensions fq in directory scanning	2025-02-04 20:34:58 +01:00
Eric Coissac	b9bee5f426	Changes to be committed: modified: go.mod modified: go.sum modified: pkg/obilua/obilib.go modified: pkg/obilua/obiseq.go modified: pkg/obilua/obiseqslice.go new file: pkg/obilua/obitaxon.go new file: pkg/obilua/obitaxonomy.go modified: pkg/obioptions/version.go	2025-02-02 16:52:52 +01:00
Eric Coissac	c10df073a7	Changes to be committed: modified: pkg/obioptions/version.go modified: pkg/obitax/iterator.go	2025-02-01 12:06:19 +01:00
Eric Coissac	d3dac1b21f	Make obitag able to use the taxonomic path included in reference database as taxonomy	2025-01-30 11:50:03 +01:00
Eric Coissac	0df082da06	Adds possibility to extract a taxonomy from taxonomic path included in sequence files	2025-01-30 11:18:21 +01:00
Eric Coissac	2452aef7a9	patch multiple -Z options	2025-01-29 21:35:28 +01:00
Eric Coissac	337954592d	add the --out option to the obitaxonomy	2025-01-29 13:22:35 +01:00
Eric Coissac	8a28c9ae7c	add the --download-ncbi option to obitaxonomy	2025-01-29 12:38:39 +01:00
Eric Coissac	b6b18c0fa1	Changes to be committed: modified: pkg/obioptions/version.go	2025-01-29 11:34:01 +01:00
Eric Coissac	67e2758d63	Switch to realease number 4.3.0	2025-01-29 11:33:30 +01:00