First attempt for obiconsensus... The graph traversing algorithm is too simple

Former-commit-id: 0456e6c7fd55d6d0fcf9856c40386b976b912cba

cmd/obitools/obiconsensus/main.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"os"
+
+	log "github.com/sirupsen/logrus"
+
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obitools/obiconsensus"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obitools/obiconvert"
+
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obioptions"
+)
+
+func main() {
+	optionParser := obioptions.GenerateOptionParser(obiconvert.OptionSet)
+
+	_, args := optionParser(os.Args)
+	obiconvert.SetFullFileBatch()
+
+	fs, err := obiconvert.CLIReadBioSequences(args...)
+
+	if err != nil {
+		log.Errorf("Cannot open file (%v)", err)
+		os.Exit(1)
+	}
+
+	consensus := obiconsensus.Consensus(fs, 0.99)
+	obiconvert.CLIWriteBioSequences(consensus, true)
+
+	obiiter.WaitForLastPipe()
+
+}

pkg/obiformats/batch_of_files_reader.go

@@ -16,7 +16,7 @@ func ReadSequencesBatchFromFiles(filenames []string,
 		reader = ReadSequencesFromFile
 	}
 
-	batchiter := obiiter.MakeIBioSequence(0)
+	batchiter := obiiter.MakeIBioSequence()
 	nextCounter := obiutils.AtomicCounter()
 
 	batchiter.Add(concurrent_readers)
@@ -48,6 +48,8 @@ func ReadSequencesBatchFromFiles(filenames []string,
 
 				log.Printf("Start reading of file : %s", filename)
 
+				
+
 				for iter.Next() {
 					batch := iter.Get()
 					batchiter.Push(batch.Reorder(nextCounter()))

pkg/obiformats/ecopcr_read.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"path"
 	"strconv"
 	"strings"
 
@@ -14,6 +15,7 @@ import (
 
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
 )
 
 type __ecopcr_file__ struct {
@@ -177,6 +179,7 @@ func ReadEcoPCR(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 	go func() {
 
 		seq, err := __read_ecopcr_bioseq__(&ecopcr)
+		seq.SetSource(opt.Source())
 		slice := make(obiseq.BioSequenceSlice, 0, opt.BatchSize())
 		i := 0
 		ii := 0
@@ -191,6 +194,7 @@ func ReadEcoPCR(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 			}
 
 			seq, err = __read_ecopcr_bioseq__(&ecopcr)
+			seq.SetSource(opt.Source())
 		}
 
 		if len(slice) > 0 {
@@ -205,14 +209,20 @@ func ReadEcoPCR(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 
 	}()
 
+	if opt.pointer.full_file_batch {
+		newIter = newIter.FullFileIterator()
+	}
+
 	return newIter
 }
 
-func ReadEcoPCRBatchFromFile(filename string, options ...WithOption) (obiiter.IBioSequence, error) {
+func ReadEcoPCRFromFile(filename string, options ...WithOption) (obiiter.IBioSequence, error) {
 	var reader io.Reader
 	var greader io.Reader
 	var err error
 
+	options = append(options, OptionsSource(obiutils.RemoveAllExt((path.Base(filename)))))
+
 	reader, err = os.Open(filename)
 	if err != nil {
 		log.Printf("open file error: %+v", err)

pkg/obiformats/embl_read.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"io"
 	"os"
+	"path"
 	"strconv"
 	"strings"
 
@@ -14,6 +15,7 @@ import (
 
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
 )
 
 var _FileChunkSize = 1 << 26
@@ -95,7 +97,7 @@ func _EndOfLastEntry(buff []byte) int {
 	return -1
 }
 
-func _ParseEmblFile(input <-chan _FileChunk, out obiiter.IBioSequence) {
+func _ParseEmblFile(source string, input <-chan _FileChunk, out obiiter.IBioSequence) {
 
 	for chunks := range input {
 		scanner := bufio.NewScanner(chunks.raw)
@@ -141,6 +143,7 @@ func _ParseEmblFile(input <-chan _FileChunk, out obiiter.IBioSequence) {
 				sequence := obiseq.NewBioSequence(id,
 					bytes.ToLower(seqBytes.Bytes()),
 					defBytes.String())
+				sequence.SetSource(source)
 				
 				sequence.SetFeatures(featBytes.Bytes())
 
@@ -257,11 +260,15 @@ func ReadEMBL(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 
 	// for j := 0; j < opt.ParallelWorkers(); j++ {
 	for j := 0; j < nworkers; j++ {
-		go _ParseEmblFile(entry_channel, newIter)
+		go _ParseEmblFile(opt.Source(),entry_channel, newIter)
 	}
 
 	go _ReadFlatFileChunk(reader, entry_channel)
 
+	if opt.pointer.full_file_batch {
+		newIter = newIter.FullFileIterator()
+	}
+
 	return newIter
 }
 
@@ -270,6 +277,8 @@ func ReadEMBLFromFile(filename string, options ...WithOption) (obiiter.IBioSeque
 	var greader io.Reader
 	var err error
 
+	options = append(options, OptionsSource(obiutils.RemoveAllExt((path.Base(filename)))))
+
 	reader, err = os.Open(filename)
 	if err != nil {
 		log.Printf("open file error: %+v", err)

pkg/obiformats/fastseq_read.go

@@ -10,15 +10,18 @@ import (
 	"bytes"
 	"fmt"
 	"os"
+	"path"
 	"unsafe"
 
 	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
 )
 
-func _FastseqReader(seqfile C.fast_kseq_p,
+func _FastseqReader(source string,
+	seqfile C.fast_kseq_p,
 	iterator obiiter.IBioSequence,
 	batch_size int) {
 	var comment string
@@ -40,7 +43,7 @@ func _FastseqReader(seqfile C.fast_kseq_p,
 		}
 
 		rep := obiseq.NewBioSequence(name, bytes.ToLower(sequence), comment)
-
+		rep.SetSource(source)
 		if s.qual.l > C.ulong(0) {
 			cquality := unsafe.Slice(s.qual.s, C.int(s.qual.l))
 			l := int(s.qual.l)
@@ -81,6 +84,9 @@ func _FastseqReader(seqfile C.fast_kseq_p,
 }
 
 func ReadFastSeqFromFile(filename string, options ...WithOption) (obiiter.IBioSequence, error) {
+
+	options = append(options, OptionsSource(obiutils.RemoveAllExt((path.Base(filename)))))
+
 	opt := MakeOptions(options)
 
 	name := C.CString(filename)
@@ -108,14 +114,20 @@ func ReadFastSeqFromFile(filename string, options ...WithOption) (obiiter.IBioSe
 	newIter := obiiter.MakeIBioSequence()
 	newIter.Add(1)
 
-	go func() {
+	go func(iter obiiter.IBioSequence) {
-		newIter.WaitAndClose()
+		iter.WaitAndClose()
-		log.Debugln("End of the fastq file reading")
+		log.Debugln("End of the fastx file reading")
-	}()
+	}(newIter)
 
-	log.Debugln("Start of the fastq file reading")
+	log.Debugln("Start of the fastx file reading")
+
+	go _FastseqReader(opt.Source(), pointer, newIter, opt.BatchSize())
+
+	log.Debugln("Full file batch mode : ", opt.FullFileBatch())
+	if opt.FullFileBatch() {
+		newIter = newIter.FullFileIterator()
+	}
 
-	go _FastseqReader(pointer, newIter, opt.BatchSize())
 	parser := opt.ParseFastSeqHeader()
 
 	if parser != nil {
@@ -126,18 +138,27 @@ func ReadFastSeqFromFile(filename string, options ...WithOption) (obiiter.IBioSe
 }
 
 func ReadFastSeqFromStdin(options ...WithOption) obiiter.IBioSequence {
+
+	options = append(options, OptionsSource("stdin"))
+
 	opt := MakeOptions(options)
 	newIter := obiiter.MakeIBioSequence()
 
 	newIter.Add(1)
 
-	go func() {
+	go func(iter obiiter.IBioSequence) {
-		newIter.WaitAndClose()
+		iter.WaitAndClose()
-	}()
+	}(newIter)
 
-	go _FastseqReader(C.open_fast_sek_stdin(C.int32_t(opt.QualityShift())),
+	go _FastseqReader(opt.Source(),
+		C.open_fast_sek_stdin(C.int32_t(opt.QualityShift())),
 		newIter, opt.BatchSize())
 
+	log.Debugln("Full file batch mode : ", opt.FullFileBatch())
+	if opt.FullFileBatch() {
+		newIter = newIter.FullFileIterator()
+	}
+
 	parser := opt.ParseFastSeqHeader()
 
 	if parser != nil {

pkg/obiformats/genbank_read.go

@@ -5,6 +5,7 @@ import (
 	"bytes"
 	"io"
 	"os"
+	"path"
 	"strconv"
 	"strings"
 
@@ -14,6 +15,7 @@ import (
 
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
 )
 
 type gbstate int
@@ -26,7 +28,8 @@ const (
 	inSequence   gbstate = 4
 )
 
-func _ParseGenbankFile(input <-chan _FileChunk, out obiiter.IBioSequence) {
+func _ParseGenbankFile(source string,
+	input <-chan _FileChunk, out obiiter.IBioSequence) {
 
 	state := inHeader
 
@@ -68,6 +71,7 @@ func _ParseGenbankFile(input <-chan _FileChunk, out obiiter.IBioSequence) {
 				sequence := obiseq.NewBioSequence(id,
 					bytes.ToLower(seqBytes.Bytes()),
 					defBytes.String())
+				sequence.SetSource(source)
 				state = inHeader
 
 				sequence.SetFeatures(featBytes.Bytes())
@@ -129,11 +133,15 @@ func ReadGenbank(reader io.Reader, options ...WithOption) obiiter.IBioSequence {
 
 	// for j := 0; j < opt.ParallelWorkers(); j++ {
 	for j := 0; j < nworkers; j++ {
-		go _ParseGenbankFile(entry_channel, newIter)
+		go _ParseGenbankFile(opt.Source(),entry_channel, newIter)
 	}
 
 	go _ReadFlatFileChunk(reader, entry_channel)
 
+	if opt.pointer.full_file_batch {
+		newIter = newIter.FullFileIterator()
+	}
+
 	return newIter
 }
 
@@ -142,6 +150,9 @@ func ReadGenbankFromFile(filename string, options ...WithOption) (obiiter.IBioSe
 	var greader io.Reader
 	var err error
 
+	options = append(options, OptionsSource(obiutils.RemoveAllExt((path.Base(filename)))))
+
+
 	reader, err = os.Open(filename)
 	if err != nil {
 		log.Printf("open file error: %+v", err)

pkg/obiformats/options.go

@@ -10,6 +10,7 @@ type __options__ struct {
 	with_progress_bar     bool
 	buffer_size           int
 	batch_size            int
+	full_file_batch       bool
 	quality_shift         int
 	parallel_workers      int
 	closefile             bool
@@ -25,6 +26,7 @@ type __options__ struct {
 	csv_separator         string
 	csv_navalue           string
 	paired_filename       string
+	source                string
 }
 
 type Options struct {
@@ -42,6 +44,7 @@ func MakeOptions(setters []WithOption) Options {
 		quality_shift:         33,
 		parallel_workers:      4,
 		batch_size:            5000,
+		full_file_batch:       false,
 		closefile:             false,
 		appendfile:            false,
 		compressed:            false,
@@ -52,9 +55,10 @@ func MakeOptions(setters []WithOption) Options {
 		csv_sequence:          true,
 		csv_quality:           false,
 		csv_separator:         ",",
-		csv_navalue: "NA",
+		csv_navalue:           "NA",
 		csv_keys:              make([]string, 0),
 		paired_filename:       "",
+		source:                "",
 	}
 
 	opt := Options{&o}
@@ -74,6 +78,10 @@ func (opt Options) BatchSize() int {
 	return opt.pointer.batch_size
 }
 
+func (opt Options) FullFileBatch() bool {
+	return opt.pointer.full_file_batch
+}
+
 func (opt Options) ParallelWorkers() int {
 	return opt.pointer.parallel_workers
 }
@@ -146,6 +154,14 @@ func (opt Options) PairedFileName() string {
 	return opt.pointer.paired_filename
 }
 
+func (opt Options) HasSource() bool {
+	return opt.pointer.source != ""
+}
+
+func (opt Options) Source() string {
+	return opt.pointer.source
+}
+
 func OptionCloseFile() WithOption {
 	f := WithOption(func(opt Options) {
 		opt.pointer.closefile = true
@@ -253,6 +269,22 @@ func OptionsBatchSize(size int) WithOption {
 	return f
 }
 
+func OptionsFullFileBatch(full bool) WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.full_file_batch = full
+	})
+
+	return f
+}
+
+func OptionsSource(source string) WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.source = source
+	})
+
+	return f
+}
+
 func OptionsWithProgressBar() WithOption {
 	f := WithOption(func(opt Options) {
 		opt.pointer.with_progress_bar = true

pkg/obiformats/universal_read.go

@@ -5,11 +5,13 @@ import (
 	"compress/gzip"
 	"io"
 	"os"
+	"path"
 	"strings"
 
 	log "github.com/sirupsen/logrus"
 
 	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
 )
 
 func GuessSeqFileType(firstline string) string {
@@ -49,6 +51,8 @@ func ReadSequencesFromFile(filename string,
 	var greader io.Reader
 	var err error
 
+	options = append(options, OptionsSource(obiutils.RemoveAllExt((path.Base(filename)))))
+	
 	file, err = os.Open(filename)
 
 	if err != nil {

pkg/obiiter/batchiterator.go

@@ -59,7 +59,7 @@ type IBioSequence struct {
 // IBioSequenceBatch type.
 var NilIBioSequence = IBioSequence{pointer: nil}
 
-func MakeIBioSequence(sizes ...int) IBioSequence {
+func MakeIBioSequence() IBioSequence {
 
 	i := _IBioSequence{
 		channel:         make(chan BioSequenceBatch),
@@ -409,7 +409,7 @@ func (iterator IBioSequence) Pool(iterators ...IBioSequence) IBioSequence {
 // IBioSequenceBatch with every batches having the same size
 // indicated in parameter. Rebatching implies to sort the
 // source IBioSequenceBatch.
-func (iterator IBioSequence) Rebatch(size int, sizes ...int) IBioSequence {
+func (iterator IBioSequence) Rebatch(size int) IBioSequence {
 
 	newIter := MakeIBioSequence()
 
@@ -686,6 +686,7 @@ func (iterator IBioSequence) Load() obiseq.BioSequenceSlice {
 	chunck := obiseq.MakeBioSequenceSlice()
 	for iterator.Next() {
 		b := iterator.Get()
+		log.Debugf("append %d sequences",b.Len())
 		chunck = append(chunck, b.Slice()...)
 		b.Recycle()
 	}
@@ -693,6 +694,33 @@ func (iterator IBioSequence) Load() obiseq.BioSequenceSlice {
 	return chunck
 }
 
+func (iterator IBioSequence) FullFileIterator() IBioSequence {
+
+	newIter := MakeIBioSequence()
+	log.Debug("Stream is read in full file mode")
+
+	newIter.Add(1)
+
+	go func() {
+		newIter.WaitAndClose()
+	}()
+
+	go func() {
+		slice := iterator.Load()
+		log.Printf("A batch of  %d sequence is read",len(slice))
+		if len(slice) > 0 {
+			newIter.Push(MakeBioSequenceBatch(0, slice))
+		}
+		newIter.Done()
+	}()
+
+	if iterator.IsPaired() {
+		newIter.MarkAsPaired()
+	}
+
+	return newIter
+}
+
 // It takes a slice of BioSequence objects, and returns an iterator that will return batches of
 // BioSequence objects
 

pkg/obikmer/debruijn.go

@@ -0,0 +1,376 @@
+package obikmer
+
+import (
+	"bytes"
+	"fmt"
+
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+)
+
+type KmerIdx32 uint32
+type KmerIdx64 uint64
+type KmerIdx128 struct {
+	Lo uint64
+	Hi uint64
+}
+
+var iupac = map[byte][]uint64{
+	'a': {0},
+	'c': {1},
+	'g': {2},
+	't': {3},
+	'u': {3},
+	'r': {0, 2},
+	'y': {1, 3},
+	's': {1, 2},
+	'w': {0, 3},
+	'k': {2, 3},
+	'm': {0, 1},
+	'b': {1, 2, 3},
+	'd': {0, 2, 3},
+	'h': {0, 1, 3},
+	'v': {0, 1, 2},
+	'n': {0, 1, 2, 3},
+}
+
+var decode = map[uint64]byte{
+	0: 'a',
+	1: 'c',
+	2: 'g',
+	3: 't',
+}
+
+type KmerIdx_t interface {
+	KmerIdx32 | KmerIdx64 | KmerIdx128
+}
+
+type DeBruijnGraph struct {
+	kmersize int
+	kmermask uint64
+	prevc    uint64
+	prevg    uint64
+	prevt    uint64
+	graph    map[uint64]uint
+}
+
+func MakeDeBruijnGraph(kmersize int) *DeBruijnGraph {
+	g := DeBruijnGraph{
+		kmersize: kmersize,
+		kmermask: ^(^uint64(0) << (uint64(kmersize+1) * 2)),
+		prevc:    uint64(1) << (uint64(kmersize) * 2),
+		prevg:    uint64(2) << (uint64(kmersize) * 2),
+		prevt:    uint64(3) << (uint64(kmersize) * 2),
+		graph:    make(map[uint64]uint),
+	}
+
+	return &g
+}
+
+func (g *DeBruijnGraph) KmerSize() int {
+	return g.kmersize
+}
+
+func (g *DeBruijnGraph) Len() int {
+	return len(g.graph)
+}
+
+func (g *DeBruijnGraph) MaxLink() int {
+	max := uint(0)
+	for _, count := range g.graph {
+		if count > max {
+			max = count
+		}
+	}
+
+	return int(max)
+}
+
+func (g *DeBruijnGraph) LinkSpectrum() []int {
+	max := g.MaxLink()
+	spectrum := make([]int, max+1)
+	for _, count := range g.graph {
+		spectrum[int(count)]++
+	}
+
+	return spectrum
+}
+
+func (g *DeBruijnGraph) FilterMin(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 {
+	rep := make([]uint64, 0, 4)
+	index = index >> 2
+
+	if _, ok := g.graph[index]; ok {
+		rep = append(rep, index)
+	}
+
+	key := index | g.prevc
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	key = index | g.prevg
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	key = index | g.prevt
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	return rep
+}
+
+func (g *DeBruijnGraph) Nexts(index uint64) []uint64 {
+	rep := make([]uint64, 0, 4)
+	index = index << 2 & g.kmermask
+
+	if _, ok := g.graph[index]; ok {
+		rep = append(rep, index)
+	}
+
+	key := index | 1
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	key = index | 2
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	key = index | 3
+	if _, ok := g.graph[key]; ok {
+		rep = append(rep, key)
+	}
+
+	return rep
+}
+
+func (g *DeBruijnGraph) MaxNext(index uint64) (uint64, bool) {
+	ns := g.Nexts(index)
+
+	if len(ns) == 0 {
+		return uint64(0), false
+	}
+
+	max := uint(0)
+	rep := uint64(0)
+	for _, idx := range ns {
+		w, _ := g.graph[idx]
+		if w > max {
+			rep = idx
+		}
+	}
+
+	return rep, true
+}
+
+func (g *DeBruijnGraph) MaxPath() []uint64 {
+	path := make([]uint64, 0, 1000)
+	ok := false
+	idx := uint64(0)
+
+	idx, ok = g.MaxHead()
+
+	for ok {
+		path = append(path, idx)
+		idx, ok = g.MaxNext(idx)
+	}
+
+	return path
+}
+
+func (g *DeBruijnGraph) LongestPath() []uint64 {
+	var path []uint64 
+	wmax := uint(0)
+	ok := true
+
+	starts:= g.Heads()
+
+	for _,idx := range starts {
+		lp := make([]uint64, 0, 1000)
+		w := uint(0)
+		for ok {
+			nw:= g.graph[idx]
+			w+=nw
+			lp = append(lp, idx)
+			idx, ok = g.MaxNext(idx)
+		}
+	
+		if w > wmax {
+			path=lp
+			wmax=w
+		}
+	}
+
+
+	return path
+}
+
+func (g *DeBruijnGraph) LongestConsensus(id string) (*obiseq.BioSequence,error) {
+	path := g.LongestPath()
+	s := g.DecodePath(path)
+
+	if len(s) > 0 {
+		seq := obiseq.MakeBioSequence(
+			id,
+			[]byte(s),
+			"",
+		)
+
+		return &seq,nil
+	}
+
+	return nil,fmt.Errorf("cannot identify optimum path")
+}
+
+
+func (g *DeBruijnGraph) Heads() []uint64 {
+	rep := make([]uint64, 0, 10)
+
+	for k := range g.graph {
+		if len(g.Previouses(k)) == 0 {
+			rep = append(rep, k)
+		}
+	}
+
+	return rep
+}
+
+func (g *DeBruijnGraph) MaxHead() (uint64, bool) {
+	rep := uint64(0)
+	max := uint(0)
+	found := false
+	for k, w := range g.graph {
+		if len(g.Previouses(k)) == 0 && w > max {
+			rep = k
+			found = true
+		}
+	}
+
+	return rep, found
+}
+
+func (g *DeBruijnGraph) DecodeNode(index uint64) string {
+	rep := make([]byte, g.kmersize)
+	index >>= 2
+	for i := g.kmersize - 1; i >= 0; i-- {
+		rep[i], _ = decode[index&3]
+		index >>= 2
+	}
+
+	return string(rep)
+}
+
+func (g *DeBruijnGraph) DecodePath(path []uint64) string {
+	rep := make([]byte, 0, len(path)+g.kmersize)
+	buf := bytes.NewBuffer(rep)
+
+	if len(path) > 0 {
+		buf.WriteString(g.DecodeNode(path[0]))
+
+		for _, idx := range path[1:] {
+			buf.WriteByte(decode[idx&3])
+		}	
+	}
+
+	return buf.String()
+}
+
+func (g *DeBruijnGraph) BestConsensus(id string) (*obiseq.BioSequence,error) {
+	path := g.MaxPath()
+	s := g.DecodePath(path)
+
+	if len(s) > 0 {
+		seq := obiseq.MakeBioSequence(
+			id,
+			[]byte(s),
+			"",
+		)
+
+		return &seq,nil
+	}
+
+	return nil,fmt.Errorf("cannot identify optimum path")
+}
+
+func (g *DeBruijnGraph) Weight(index uint64) int {
+	val, ok := g.graph[index]
+	if !ok {
+		val = 0
+	}
+	return int(val)
+}
+
+func (graph *DeBruijnGraph) append(sequence []byte, current uint64) {
+
+	for i := 0; i < len(sequence); i++ {
+		current <<= 2
+		current &= graph.kmermask
+		b := iupac[sequence[i]]
+		if len(b) == 1 {
+			current |= b[0]
+
+			weight, ok := graph.graph[current]
+			if !ok {
+				weight = 0
+			}
+			graph.graph[current] = weight + 1
+		} else {
+			for j := 0; j < len(b); j++ {
+				current &= ^uint64(3)
+				current |= b[j]
+
+				weight, ok := graph.graph[current]
+				if !ok {
+					weight = 0
+				}
+				graph.graph[current] = weight + 1
+				graph.append(sequence[(i+1):], current)
+			}
+			return
+		}
+
+	}
+}
+
+func (graph *DeBruijnGraph) Push(sequence *obiseq.BioSequence) {
+	key := uint64(0)
+	s := sequence.Sequence()
+	init := make([]uint64, 0, 16)
+	var f func(start int, key uint64)
+	f = func(start int, key uint64) {
+		for i := start; i < graph.kmersize; i++ {
+			key <<= 2
+			b := iupac[s[i]]
+			if len(b) == 1 {
+				key |= b[0]
+			} else {
+				for j := 0; j < len(b); j++ {
+					key &= ^uint64(3)
+					key |= b[j]
+					f(i+1, key)
+				}
+				return
+			}
+		}
+		init = append(init, key&graph.kmermask)
+	}
+
+	f(0, key)
+
+	for _, idx := range init {
+		graph.append(s[graph.kmersize:], idx)
+	}
+
+}

pkg/obiseq/biosequence.go

@@ -52,6 +52,7 @@ type Annotation map[string]interface{}
 type BioSequence struct {
 	id          string // The identidier of the sequence (private accessible through the method Id)
 	definition  string // The documentation of the sequence (private accessible through the method Definition)
+	source      string // The filename without directory name and extension from where the sequence was read.
 	sequence    []byte // The sequence itself, it is accessible by the methode Sequence
 	qualities   []byte // The quality scores of the sequence.
 	feature     []byte
@@ -67,6 +68,7 @@ func MakeEmptyBioSequence() BioSequence {
 	return BioSequence{
 		id:          "",
 		definition:  "",
+		source:      "",
 		sequence:    nil,
 		qualities:   nil,
 		feature:     nil,
@@ -199,6 +201,16 @@ func (s *BioSequence) Annotations() Annotation {
 	return s.annotations
 }
 
+// Checking if the BioSequence has a source.
+func (s *BioSequence) HasSource() bool {
+	return len(s.source) > 0
+}
+
+func (s *BioSequence) Source() string {
+	return s.source
+}
+
+
 // Returning the MD5 hash of the sequence.
 func (s *BioSequence) MD5() [16]byte {
 	return md5.Sum(s.sequence)
@@ -214,6 +226,11 @@ func (s *BioSequence) SetDefinition(definition string) {
 	s.definition = definition
 }
 
+// Setting the source of the sequence.
+func (s *BioSequence) SetSource(source string) {
+	s.source = source
+}
+
 // Setting the features of the BioSequence.
 func (s *BioSequence) SetFeatures(feature []byte) {
 	if cap(s.feature) >= 300 {

pkg/obisuffix/suffix_array.go

@@ -0,0 +1,137 @@
+package obisuffix
+
+import (
+	"bytes"
+	"fmt"
+	"sort"
+
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
+)
+
+type Suffix struct {
+	Idx uint32
+	Pos uint32
+}
+
+type SuffixArray struct {
+	Sequences *obiseq.BioSequenceSlice
+	Suffixes  []Suffix
+	Common    []int
+}
+
+func SuffixLess(suffixarray SuffixArray) func(i, j int) bool {
+	less := func(i, j int) bool {
+		si := suffixarray.Suffixes[i]
+		bi := (*suffixarray.Sequences)[int(si.Idx)].Sequence()[si.Pos:]
+		sj := suffixarray.Suffixes[j]
+		bj := (*suffixarray.Sequences)[int(sj.Idx)].Sequence()[sj.Pos:]
+
+		l := obiutils.MinInt(len(bi), len(bj))
+		p := 0
+		for p < l && bi[p] == bj[p] {
+			p++
+		}
+
+		// if p < l {
+		// 	log.Debugln(si, sj, p, l, rune(bi[p]), rune(bj[p]))
+		// } else {
+		// 	log.Debugln(si, sj, p, l, rune('-'), rune('-'))
+		// }
+
+		if p == l {
+			switch {
+			case len(bi) != len(bj):
+				return len(bi) < len(bj)
+			case si.Idx != sj.Idx:
+				return si.Idx < sj.Idx
+			default:
+				return si.Pos < sj.Pos
+			}
+		}
+
+		return bi[p] < bj[p]
+	}
+
+	return less
+}
+
+func BuildSuffixArray(data *obiseq.BioSequenceSlice) SuffixArray {
+	totalLength := 0
+	for _, s := range *data {
+		totalLength += s.Len()
+	}
+
+	sa := SuffixArray{
+		Sequences: data,
+		Suffixes:  make([]Suffix, 0, totalLength),
+	}
+
+	for i, s := range *data {
+		sl := uint32(s.Len())
+		for p := uint32(0); p < sl; p++ {
+			sa.Suffixes = append(sa.Suffixes, Suffix{uint32(i), p})
+		}
+	}
+
+	sort.SliceStable(sa.Suffixes, SuffixLess(sa))
+	return sa
+}
+
+func (suffixarray *SuffixArray) CommonSuffix() []int {
+	if len(suffixarray.Common) == len(suffixarray.Suffixes) {
+		return suffixarray.Common
+	}
+
+	lrep := len(suffixarray.Suffixes)
+	rep := make([]int, lrep)
+
+	sp := suffixarray.Suffixes[0]
+	bp := (*suffixarray.Sequences)[int(sp.Idx)].Sequence()[sp.Pos:]
+	for i := 1; i < lrep; i++ {
+		si := suffixarray.Suffixes[i]
+		bi := (*suffixarray.Sequences)[int(si.Idx)].Sequence()[si.Pos:]
+
+		l := obiutils.MinInt(len(bi), len(bp))
+		p := 0
+		for p < l && bi[p] == bp[p] {
+			p++
+		}
+		rep[i-1] = p
+		sp = si
+		bp = bi
+	}
+
+	rep[lrep-1] = 0
+
+	suffixarray.Common = rep
+
+	return suffixarray.Common
+}
+
+func (suffixarray *SuffixArray) String() string {
+	sb := bytes.Buffer{}
+
+	common := suffixarray.CommonSuffix()
+
+	sb.WriteString("Common\tSeqIdx\tPosition\tSuffix\n")
+
+	for i := range suffixarray.Suffixes {
+		idx := suffixarray.Suffixes[i].Idx
+		pos := suffixarray.Suffixes[i].Pos
+		sb.WriteString(fmt.Sprintf("%6d\t%6d\t%8d\t%s\n",
+			common[i],
+			idx,
+			pos,
+			string((*suffixarray.Sequences)[idx].Sequence()[pos:]),
+		))
+	}
+
+	return sb.String()
+}
+
+// func LongestInternalRepeat(suffixarray SuffixArray) []int {
+// 	common := suffixarray.CommonSuffix()
+// 	rep := make([]int, len(*suffixarray.Sequences))
+
+// }

pkg/obitools/obiconsensus/obiconsensus.go

@@ -0,0 +1,123 @@
+package obiconsensus
+
+import (
+	"sort"
+
+	log "github.com/sirupsen/logrus"
+
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiiter"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obikmer"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiseq"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obisuffix"
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obiutils"
+)
+
+func BuildConsensus(seqs obiseq.BioSequenceSlice, quorum float64) (*obiseq.BioSequence, error) {
+
+	log.Printf("Number of reads : %d\n", len(seqs))
+
+	longest := make([]int, len(seqs))
+
+	for i := range seqs {
+		s := seqs[i : i+1]
+		sa := obisuffix.BuildSuffixArray(&s)
+		longest[i] = obiutils.MaxSlice(sa.CommonSuffix())
+	}
+
+	o := obiutils.Order(sort.IntSlice(longest))
+	i := int(float64(len(seqs)) * quorum)
+
+	kmersize := longest[o[i]] + 1
+	log.Printf("estimated kmer size : %d", kmersize)
+
+	graph := obikmer.MakeDeBruijnGraph(kmersize)
+
+	for _, s := range seqs {
+		graph.Push(s)
+	}
+
+	log.Printf("Graph size : %d\n", graph.Len())
+	total_kmer := graph.Len()
+	spectrum := graph.LinkSpectrum()
+	cum := make(map[int]int)
+
+	spectrum[1]=0
+	for i := 2; i < len(spectrum); i++ {
+		spectrum[i] += spectrum[i-1]
+		cum[spectrum[i]]++
+	}
+
+	max := 0
+	kmax := 0
+	for k, obs := range cum {
+		if obs > max {
+			max = obs
+			kmax = k
+		}
+	}
+
+	threshold := 0
+	for i, total := range spectrum {
+		if total == kmax {
+			threshold = i
+			break
+		}
+	}
+
+	graph.FilterMin(threshold)
+	log.Printf("Graph size : %d\n", graph.Len())
+
+	seq,err :=  graph.LongestConsensus(seqs[0].Source())
+
+	seq.SetCount(len(seqs))
+	seq.SetAttribute("seq_length",seq.Len())
+	seq.SetAttribute("kmer_size",kmersize)
+	seq.SetAttribute("kmer_min_occur",threshold)
+	seq.SetAttribute("kmer_max_occur",graph.MaxLink())
+	seq.SetAttribute("filtered_graph_size",graph.Len())
+	seq.SetAttribute("full_graph_size",total_kmer)
+
+	return seq,err
+}
+
+func Consensus(iterator obiiter.IBioSequence, quorum float64) obiiter.IBioSequence {
+	newIter := obiiter.MakeIBioSequence()
+    size:=10
+
+	newIter.Add(1)
+
+	go func() {
+		newIter.WaitAndClose()
+	}()
+
+	go func() {
+		order := 0
+		iterator = iterator.SortBatches()
+		buffer := obiseq.MakeBioSequenceSlice()
+
+		for iterator.Next() {
+			seqs := iterator.Get()
+			consensus,err := BuildConsensus(seqs.Slice(),quorum)
+
+			if err == nil {
+				buffer = append(buffer, consensus)
+			}
+
+			if len(buffer) == size {
+				newIter.Push(obiiter.MakeBioSequenceBatch(order, buffer))
+				order++
+				buffer = obiseq.MakeBioSequenceSlice()
+			}
+			seqs.Recycle()
+		}
+
+		if len(buffer) > 0 {
+			newIter.Push(obiiter.MakeBioSequenceBatch(order, buffer))
+		}
+
+		newIter.Done()
+
+	}()
+
+	return newIter
+}

pkg/obitools/obiconsensus/options.go

@@ -0,0 +1,13 @@
+package obiconsensus
+
+import (
+	"git.metabarcoding.org/lecasofts/go/obitools/pkg/obitools/obiconvert"
+	"github.com/DavidGamba/go-getoptions"
+)
+
+
+func OptionSet(options *getoptions.GetOpt) {
+	obiconvert.InputOptionSet(options)
+	obiconvert.OutputOptionSet(options)
+}
+

pkg/obitools/obiconvert/options.go

@@ -30,6 +30,8 @@ var __compressed__ = false
 var __output_file_name__ = "-"
 var __paired_file_name__ = ""
 
+var __full_file_batch__ = false
+
 func InputOptionSet(options *getoptions.GetOpt) {
 	// options.IntVar(&__skipped_entries__, "skip", __skipped_entries__,
 	// 	options.Description("The N first sequence records of the file are discarded from the analysis and not reported to the output file."))
@@ -201,3 +203,10 @@ func CLIHasPairedFile() bool {
 func CLIPairedFileName() string {
 	return __paired_file_name__
 }
+
+func SetFullFileBatch() {
+	__full_file_batch__ = true
+}
+func FullFileBatch() bool {
+	return __full_file_batch__
+}

pkg/obitools/obiconvert/sequence_reader.go

@@ -99,9 +99,13 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 	opts = append(opts, obiformats.OptionsBatchSize(obioptions.CLIBatchSize()))
 
 	opts = append(opts, obiformats.OptionsQualityShift(CLIInputQualityShift()))
+	opts = append(opts, obiformats.OptionsFullFileBatch(FullFileBatch()))
+
 
 	if len(filenames) == 0 {
 		log.Printf("Reading sequences from stdin in %s\n", CLIInputFormat())
+		opts = append(opts, obiformats.OptionsSource("stdin"))
+
 		switch CLIInputFormat() {
 		case "ecopcr":
 			iterator = obiformats.ReadEcoPCR(os.Stdin, opts...)
@@ -121,7 +125,7 @@ func CLIReadBioSequences(filenames ...string) (obiiter.IBioSequence, error) {
 
 		switch CLIInputFormat() {
 		case "ecopcr":
-			reader = obiformats.ReadEcoPCRBatchFromFile
+			reader = obiformats.ReadEcoPCRFromFile
 		case "embl":
 			reader = obiformats.ReadEMBLFromFile
 		case "genbank":

pkg/obiutils/path.go

@@ -0,0 +1,16 @@
+package obiutils
+
+import (
+	"path"
+	"strings"
+)
+
+func RemoveAllExt(p string) string {
+  
+	for ext := path.Ext(p); len(ext) > 0; ext = path.Ext(p) {
+	  p = strings.TrimSuffix(p, ext)
+	}
+  
+	return p
+  
+  }