seqkit seq -s option is breaking down the single line sequence

[ghost]

seqkit version: seqkit v0.12.0

Input fasta:

>419759601_1
GTCTTGCATCTATAGTATTTTTACCCTGGTGGATATCTCTATCATTTCAAAAAAGTCTGGAATCTTGGGTTACTGATTCGTGGAATATTAAACAATCTGCAACTTTTTTGAATGATATTCTAGAAACTAGTCTTCTAGAAAAATTCAACGA

issue:

1. Input fasta copy/pasted above is a single line fasta.
2. Seqkit -s is supposed to print sequence as a sequence without changing the input format. Otherwise, user has to type in seqkit -sw0 for extracting sequences in a single line from a flattened fasta file.
3. Seqkit -s is printing sequence in 3 lines (probably at 60 characters per line- not sure of this) as below:

$ seqkit seq -s test.fa 
GTCTTGCATCTATAGTATTTTTACCCTGGTGGATATCTCTATCATTTCAAAAAAGTCTGG
AATCTTGGGTTACTGATTCGTGGAATATTAAACAATCTGCAACTTTTTTGAATGATATTC
TAGAAACTAGTCTTCTAGAAAAATTCAACGA

To check if sequence is indeed is broken into 3 lines, into three lines, following code was run:

seqkit seq -w 0 test.fa | seqkit seq -s | sed -n '3p'
TAGAAACTAGTCTTCTAGAAAAATTCAACGA

Third line is TAGAAACTAGTCTTCTAGAAAAATTCAACGA

Expected behaviour:

$seqkit seq -s test.fa
GTCTTGCATCTATAGTATTTTTACCCTGGTGGATATCTCTATCATTTCAAAAAAGTCTGGAATCTTGGGTTACTGATTCGTGGAATATTAAACAATCTGCAACTTTTTTGAATGATATTCTAGAAACTAGTCTTCTAGAAAAATTCAACGA

sequence should be printed without gaps, in a single line.

[shenwei356]

It makes sense, I'll fix this.