Output is disrupted when word has leading or trailing spaces

[LukeSavefrogs]

...Continuing discussion from my comment on issue #18...

Problem

When any word in the line has a leading or trailing space, all next words get shifted.

Examples

• Does not work, word be has leading space:

printf "test\tshort\nthis\twont\t be\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t
test    short   
this    wont         be aligned
with    the     rest

• Does not work, word this has trailing space:

printf "test\tshort\nthis \twont\tbe\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t
test    short   
this            wont    be      aligned
with    the     rest

• Works, no words with leading or trailing spaces:

printf "test\tshort\nthis\twill\tbe\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t
test    short
this    will    be      aligned
with    the     rest

[LukeSavefrogs]

Workaround

Specifying the output separator as $"\t" renders the output as it should.

See the differences by yourself:

• Works, word be has leading space:

printf "test\tshort\nthis\twont\t be\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t -s $"\t"
test  short
this  wont    be   aligned
with  the    rest

• Works, word this has trailing space:

printf "test\tshort\nthis \twont\tbe\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t -s $"\t"
test   short
this   wont   be    aligned
with   the    rest

• Works, no words with leading or trailing spaces:

printf "test\tshort\nthis\twill\tbe\taligned\nwith\tthe\trest\n" | src/column_ansi.sh -t -s $"\t"
test  short
this  will   be    aligned
with  the    rest

[LukeSavefrogs]

This issue has been solved by using a regex instead of a plain string matching spaces.. This happened because tabs were kept as is in the output, whereas column interprets both \s and \t as default column separator.

column_ansi/src/column_ansi.pl

Line 37 in bc31e6b

$INPUT_SEPARATOR = qr/[\s\t]+/;