fish-shell/share/functions/__fish_complete_freedesktop_icons.fish

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function __fish_complete_freedesktop_icons -d 'List installed icon names according to `https://specifications.freedesktop.org/icon-theme-spec/0.13/`'
# The latest `icon-theme-spec` as of 2024-08-10 is 0.13
# https://specifications.freedesktop.org/icon-theme-spec/latest/
# https://specifications.freedesktop.org/icon-theme-spec/0.13/#directory_layout
# 1. $HOME/.icons
# 2. $XDG_DATA_DIRS/icons
# 3. /usr/share/pixmaps
set -l dirs (path filter -rd -- ~/.icons $XDG_DATA_DIRS/icons /usr/share/pixmaps)
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# https://specifications.freedesktop.org/icon-theme-spec/0.13/#definitions
# .png, .svg and .xpm are valid icon file formats
path filter -rf -- $dirs/**/*.{png,svg,xpm} \
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| path basename \
| path change-extension ''
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end