Adds the possiblility to append to files to obidistribute

pkg/obiformats/fastseq_write_fasta.go

@@ -157,7 +157,19 @@ func WriteFastaToFile(iterator obiiter.IBioSequence,
 	filename string,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 
-	file, err := os.Create(filename)
+	var file *os.File
+	var err error
+
+	opt := MakeOptions(options)
+
+	if opt.AppendFile() {
+		log.Debug("Open files in appending mode")
+		file, err = os.OpenFile(filename,
+			os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	} else {
+		file, err = os.Create(filename)
+	}
+
 
 	if err != nil {
 		log.Fatalf("open file error: %v", err)

pkg/obiformats/fastseq_write_fastq.go

@@ -147,7 +147,18 @@ func WriteFastqToFile(iterator obiiter.IBioSequence,
 	filename string,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 
-	file, err := os.Create(filename)
+	var file *os.File
+	var err error
+
+	opt := MakeOptions(options)
+
+	if opt.AppendFile() {
+		log.Debug("Open files in appending mode")
+		file, err = os.OpenFile(filename,
+			os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	} else {
+		file, err = os.Create(filename)
+	}
 
 	if err != nil {
 		log.Fatalf("open file error: %v", err)

pkg/obiformats/options.go

@@ -13,6 +13,7 @@ type __options__ struct {
 	quality_shift         int
 	parallel_workers      int
 	closefile             bool
+	appendfile            bool
 }
 
 type Options struct {
@@ -31,6 +32,7 @@ func MakeOptions(setters []WithOption) Options {
 		parallel_workers:      4,
 		batch_size:            5000,
 		closefile:             false,
+		appendfile:            false,
 	}
 
 	opt := Options{&o}
@@ -74,6 +76,10 @@ func (opt Options) CloseFile() bool {
 	return opt.pointer.closefile
 }
 
+func (opt Options) AppendFile() bool {
+	return opt.pointer.appendfile
+}
+
 func OptionsBufferSize(size int) WithOption {
 	f := WithOption(func(opt Options) {
 		opt.pointer.buffer_size = size
@@ -98,6 +104,22 @@ func OptionDontCloseFile() WithOption {
 	return f
 }
 
+func OptionsAppendFile() WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.appendfile = true
+	})
+
+	return f
+}
+
+func OptionsNewFile() WithOption {
+	f := WithOption(func(opt Options) {
+		opt.pointer.appendfile = false
+	})
+
+	return f
+}
+
 // Allows to specify the ascii code corresponding to
 // a quality of 0 in fastq encoded quality scores.
 func OptionsQualityShift(shift int) WithOption {

pkg/obiformats/universal_write.go

@@ -55,7 +55,18 @@ func WriteSequencesToFile(iterator obiiter.IBioSequence,
 	filename string,
 	options ...WithOption) (obiiter.IBioSequence, error) {
 
-	file, err := os.Create(filename)
+	var file *os.File
+	var err error
+
+	opt := MakeOptions(options)
+
+	if opt.AppendFile() {
+		log.Debug("Open files in appending mode")
+		file, err = os.OpenFile(filename,
+			os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	} else {
+		file, err = os.Create(filename)
+	}
 
 	if err != nil {
 		log.Fatalf("open file error: %v", err)