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author | Suraj N. Kurapati <sunaku@riseup.net> | 2021-06-25 23:04:05 -0700 |
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committer | Daniel Shahaf <d.s@daniel.shahaf.name> | 2021-07-06 01:56:07 +0000 |
commit | d634a3d333027561eb2d96120f3d40a876f1dd6f (patch) | |
tree | e5c1ea673c8af6b45cd30a000c7f48a783670094 /Completion/openSUSE/Command | |
parent | d293c12de696c190f2db4d565484ae48cf2bf977 (diff) | |
download | zsh-d634a3d333027561eb2d96120f3d40a876f1dd6f.tar.gz zsh-d634a3d333027561eb2d96120f3d40a876f1dd6f.tar.xz zsh-d634a3d333027561eb2d96120f3d40a876f1dd6f.zip |
49128 (github #76): vcs_info-examples: optimize +vi-git-untracked()
Speed up the prompt on large and/or deep working directories by stopping grep(1) as soon as it finds a single match, with `-q`. Also, correct the regexp by adding a ^ anchor and increase its specificity by accounting for the space in Porcelain Format v1. Previously, +vi-git-untracked() waited for grep(1) to find all matches of untracked files, redirecting them away to /dev/null, before finally concluding that untracked files do indeed exist. With this patch, I see 4x speedup on a large Git-enabled $HOME: $ time (git status --porcelain | wc -l) 212 0.01s user 0.02s system 0% cpu 9.021 total $ time (git status --porcelain | grep '??' &>/dev/null) 0.01s user 0.02s system 0% cpu 12.294 total $ time (git status --porcelain | grep -q '^?? ' 2>/dev/null) 0.01s user 0.01s system 0% cpu 3.097 total Note that `-q` for grep(1) is in POSIX (IEEE Std 1003.1-2017): https://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html See discussion https://www.zsh.org/mla/workers/2021/msg01354.html
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