Re: [sort] Suggestion: count keys from the end of record

[Rob Landley]

On 8/15/23 05:08, Budi wrote:
> so many did and hoped, the most recent:
> 
> https://stackoverflow.com/questions/76892900/sort-text-page-based-on-5th-column-out-of-6-columns-being-troubled-with-as-the

I implemented negative keys and came up with some basic tests for them:

https://github.com/landley/toybox/commit/8deb5891fb4c

Translating the relevant new tests from toybox-ese:

+toyonly testcmd 'negative -k' '-k-2,-2 -k-1r' 'a b z\nd e q\nx e a\nb m n\n' \
+  '' 'a b z\nd e q\nb m n\nx e a\n'

echo -ne 'a b z\nd e q\nb m n\nx e a\n' | sort -k-2,-2 -k-1r
a b z
d e q
x e a
b m n

+toyonly testcmd 'negative -k2' '-k-2' 'a b z\nx e a\nd e q\nb m n\n' \
+  '' 'a b z\nd e q\nb m n\nx e a\n'

echo -ne 'a b z\nd e q\nb m n\nx e a\n' | sort -k-2
a b z
x e a
d e q
b m n

+toyonly testcmd 'negative straddle' '-k-1r' 'm n o\nj k\ng h i\nd e\na b c\n' \
+  '' 'a b c\nd e\ng h i\nj k\nm n o\n'

$ echo -ne 'a b c\nd e\ng h i\nj k\nm n o\n' | sort -k-1r
m n o
j k
g h i
d e
a b c

+toyonly testcmd 'missing negative' '-k-3r' 'm n o\ng h i\na b c\nd e\nj k\n' \
+  '' 'a b c\nd e\ng h i\nj k\nm n o\n'

$ echo -ne 'a b c\nd e\ng h i\nj k\nm n o\n' | ./sort -k-3r
m n o
g h i
a b c
d e
j k

Haven't implemented negative offsets yet (it currently just ignores them)...

Rob