Add Width Option

[gierens]

ls has a -w/--width option limiting the columns of the grid output. exa/eza only allows to specify the number of columns via the COLUMNS environment variable for some reason.

This adds the -w/--width option to the existing column limiting, meaning it behaves just like when specifying the COLUMNS variable, but with the ls-like command line argument. In case both COLUMNS and -w, then the cli option takes precedence.

The only difference to the -w option of ls is, that ls -w 0 sets the columns to infinity, while here it goes back to automatic width detection just as for the COLUMNS variable.

Resolves ogham/exa#1168

[cafkafk]

• This needs to include completions for fish and zsh as far as I can tell.
• This needs to conform to conventional commits

[cafkafk]

I'll help with the summaries, maybe the completions

[cafkafk]

After testing this a bit I found two bugs #129, #130, but neither are a flaw introduced by this PR. Guess that alone makes the case for this being a useful feature 😆

Testing seems to indicate this works as intended, and I like this addition a lot.

Thanks a lot for your contributions!

[gierens]

I'll help with the summaries, maybe the completions

Ah great thank's :) ... When I skimmed the completion files they seemed kind of outdated, some flags missing, therefore I thought they are not maintained and skipped including the new option ... lazy me :D