depot/third_party/nixpkgs/pkgs/build-support/setup-hooks/desktop-to-darwin-bundle.sh

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#!/usr/bin/env bash
fixupOutputHooks+=('convertDesktopFiles $prefix')
# Get a param out of a desktop file. First parameter is the file and the second
# is a pattern of the key who's value we should fetch.
getDesktopParam() {
local file="$1";
local pattern="$2";
awk -F "=" "/${pattern}/ {print \$2}" "${file}"
}
# For a given .desktop file, generate a darwin '.app' bundle for it.
convertDesktopFile() {
local -r file="$1"
local -r name=$(getDesktopParam "${file}" "^Name")
local -r exec=$(getDesktopParam "${file}" "Exec")
local -r iconName=$(getDesktopParam "${file}" "Icon")
local -r iconFiles=$(find "$out/share/icons/" -name "${iconName}.*" 2>/dev/null);
local -r pixMaps=$(find "$out/share/pixmaps/" -name "${iconName}.xpm" 2>/dev/null);
mkdir -p "$out/Applications/${name}.app/Contents/MacOS"
mkdir -p "$out/Applications/${name}.app/Contents/Resources"
local i=0;
for icon in $iconFiles; do
ln -s "$icon" "$out/Applications/${name}.app/Contents/Resources/$i-$(basename "$icon")"
(( i +=1 ));
done
for pixmap in $pixMaps; do
local newIconName="$i-$(basename "$pixmap")";
convert "$pixmap" "$out/Applications/${name}.app/Contents/Resources/${newIconName%.xpm}.png"
(( i +=1 ));
done
write-darwin-bundle "$out" "$name" "$exec"
}
convertDesktopFiles() {
local dir="$1/share/applications/"
if [ -d "${dir}" ]; then
for desktopFile in $(find "$dir" -iname "*.desktop"); do
convertDesktopFile "$desktopFile";
done
fi
}