ls: Reduce binary size of ls by removing regex crate

[kimono-koans]

Became interested in reducing the size of the ls binary after reading this: https://www.reddit.com/r/rust/comments/riqolp/whats_in_a_rust_binary/

Via 'cargo bloat', I found that the regex crate was the main culprit, and was a sub-dependency of the globset package. I was able to replace with the glob crate, as there is no need for full regex implementation in ls.

This change reduces the release binary size of ls by over 1/2.

[sylvestre]

terrific. would it be possible to include that in the ci ?

[kimono-koans]

terrific. would it be possible to include that in the ci ?

I don't have much experience with different types of CI, but I suppose you could warn on including bloat-y crates and suggest using 'cargo bloat, tree.' Here is a sample output of 'cargo bloat --crates -p uu_ls' before I made any changes:

File .text Size Crate
14.2% 27.6% 385.6KiB std
11.2% 21.7% 303.8KiB clap
7.2% 14.0% 196.0KiB regex_syntax
6.5% 12.7% 177.1KiB regex
3.8% 7.3% 102.4KiB uu_ls
2.9% 5.7% 79.4KiB globset
2.8% 5.4% 75.1KiB aho_corasick
0.7% 1.4% 19.3KiB chrono
0.6% 1.2% 16.3KiB [Unknown]
0.5% 1.1% 14.7KiB memchr
0.5% 0.9% 12.8KiB uucore
0.4% 0.8% 11.7KiB lscolors
0.2% 0.5% 6.3KiB ansi_term
0.2% 0.3% 4.3KiB term_grid
0.1% 0.3% 3.9KiB os_display
0.1% 0.2% 2.8KiB strsim
0.1% 0.1% 1.7KiB textwrap
0.0% 0.1% 1.0KiB once_cell
0.0% 0.0% 304B number_prefix
0.0% 0.0% 256B log
0.0% 0.0% 704B And 6 more crates. Use -n N to show more.
51.3% 100.0% 1.4MiB .text section size, the file size is 2.7MiB