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Use cksum in the disco prompt

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It's posix, and apparently faster on slow systems. I literally can't
see a measurable difference on mine.
This commit is contained in:
Fabian Homborg 2021-11-03 17:52:44 +01:00
parent de79458be2
commit 7993987b23
1 changed files with 11 additions and 4 deletions
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15
share/tools/web_config/sample_prompts/disco.fish
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@ -14,12 +14,19 @@ function fish_prompt
fish_is_root_user; and set delim "#"
set -l cwd (set_color $fish_color_cwd)
if command -sq sha256sum
if command -sq cksum
# randomized cwd color
set -l shas (pwd -P | sha256sum | string sub -l 6 | string match -ra ..)
# Increase color a bit so we don't get super dark colors.
# We hash the physical PWD and turn that into a color. That means directories (usually) get different colors,
# but every directory always gets the same color. It's deterministic.
# We use cksum because 1. it's fast, 2. it's in POSIX, so it should be available everywhere.
set -l shas (pwd -P | cksum | string split -f1 ' ' | math --base=hex | string sub -s 3 | string match -ra ..) 0 0 0
# We get a fourth byte, just distribute it among the others.
# Also increase the value a bit so we don't get super dark colors.
# Really we want some contrast to the background (assuming black).
set -l col (for f in $shas; math --base=hex "min(255, 0x$f + 0x30)"; end | string replace 0x '' | string pad -c 0 -w 2 | string join "")
set -l smear 0x30
set -q shas[4]
and set smear (math 0x$shas[4] / 3 + 0x30)
set -l col (for f in $shas[1..3]; math --base=hex "min(255, 0x$f + $smear)"; end | string replace 0x '' | string pad -c 0 -w 2 | string join "")
set cwd (set_color $col)
end