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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}"
}
# Convert a freedesktop.org icon theme for a given app to a .icns file. When possible, missing
# icons are synthesized from SVG or rescaled from existing ones (when within the size threshold).
convertIconTheme() {
local -r out=$1
local -r sharePath=$2
local -r iconName=$3
local -r theme=${4:-hicolor}
local -ra iconSizes=(16 32 128 256 512)
local -ra scales=([1]="" [2]="@2")
# Based loosely on the algorithm at:
# https://specifications.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html#icon_lookup
# Assumes threshold = 2 for ease of implementation.
function findIcon() {
local -r iconSize=$1
local -r scale=$2
local scaleSuffix=${scales[$scale]}
local exactSize=${iconSize}x${iconSize}${scaleSuffix}
local -a validSizes=(
${exactSize}
$(expr $iconSize + 1)x$(expr $iconSize + 1)${scaleSuffix}
$(expr $iconSize + 2)x$(expr $iconSize + 2)${scaleSuffix}
$(expr $iconSize - 1)x$(expr $iconSize - 1)${scaleSuffix}
$(expr $iconSize - 2)x$(expr $iconSize - 2)${scaleSuffix}
)
for iconIndex in "${!candidateIcons[@]}"; do
for maybeSize in "${validSizes[@]}"; do
icon=${candidateIcons[$iconIndex]}
if [[ $icon = */$maybeSize/* ]]; then
if [[ $maybeSize = $exactSize ]]; then
echo "fixed $icon"
else
echo "threshold $icon"
fi
return 0
fi
done
done
echo "scalable"
}
function resizeIcon() {
local -r in=$1
local -r out=$2
local -r iconSize=$3
local -r scale=$4
local density=$(expr 72 \* $scale)x$(expr 72 \* $scale)
local dim=$(expr $iconSize \* $scale)
magick convert -scale "${dim}x${dim}" -density "$density" -units PixelsPerInch "$in" "$out"
}
function synthesizeIcon() {
local -r in=$1
local -r out=$2
local -r iconSize=$3
local -r scale=$4
if [[ $in != '-' ]]; then
local density=$(expr 72 \* $scale)x$(expr 72 \* $scale)
local dim=$(expr $iconSize \* $scale)
rsvg-convert --keep-aspect-ratio --width "$dim" --height "$dim" "$in" --output "$out"
magick convert -density "$density" -units PixelsPerInch "$out" "$out"
else
return 1
fi
}
function getIcons() {
local -r sharePath=$1
local -r iconname=$2
local -r theme=$3
local -r resultdir=$(mktemp -d)
local -ar candidateIcons=(
"${sharePath}/icons/${theme}/"*"/${iconname}.png"
"${sharePath}/icons/${theme}/"*"/${iconname}.xpm"
)
local -a scalableIcon=("${sharePath}/icons/${theme}/scalable/${iconname}.svg"*)
if [[ ${#scalableIcon[@]} = 0 ]]; then
scalableIcon=('-')
fi
for iconSize in "${iconSizes[@]}"; do
for scale in "${!scales[@]}"; do
local iconResult=$(findIcon $iconSize $scale)
local type=${iconResult%% *}
local icon=${iconResult#* }
local scaleSuffix=${scales[$scale]}
local result=${resultdir}/${iconSize}x${iconSize}${scales[$scale]}${scaleSuffix:+x}.png
case $type in
fixed)
local density=$(expr 72 \* $scale)x$(expr 72 \* $scale)
magick convert -density "$density" -units PixelsPerInch "$icon" "$result"
;;
threshold)
# Synthesize an icon of the exact size if a scalable icon is available
# instead of scaling one and ending up with a fuzzy icon.
if ! synthesizeIcon "${scalableIcon[0]}" "$result" "$iconSize" "$scale"; then
resizeIcon "$icon" "$result" "$iconSize" "$scale"
fi
;;
scalable)
synthesizeIcon "${scalableIcon[0]}" "$result" "$iconSize" "$scale" || true
;;
esac
done
done
echo "$resultdir"
}
iconsdir=$(getIcons "$sharePath" "apps/${iconName}" "$theme")
if [[ ! -z "$(ls -1 "$iconsdir/"*)" ]]; then
icnsutil compose "$out/${iconName}.icns" "$iconsdir/"*
else
echo "Warning: no icons were found. Creating an empty icon for ${iconName}.icns."
touch "$out/${iconName}.icns"
fi
}
# For a given .desktop file, generate a darwin '.app' bundle for it.
convertDesktopFile() {
local -r file=$1
local -r sharePath=$(dirname "$(dirname "$file")")
local -r name=$(getDesktopParam "${file}" "^Name")
local -r exec=$(getDesktopParam "${file}" "Exec")
local -r iconName=$(getDesktopParam "${file}" "^Icon")
local -r squircle=$(getDesktopParam "${file}" "X-macOS-SquircleIcon")
mkdir -p "$out/Applications/${name}.app/Contents/MacOS"
mkdir -p "$out/Applications/${name}.app/Contents/Resources"
convertIconTheme "$out/Applications/${name}.app/Contents/Resources" "$sharePath" "$iconName"
write-darwin-bundle "$out" "$name" "$exec" "$iconName" "$squircle"
}
convertDesktopFiles() {
local dir="$1/share/applications/"
if [ -d "${dir}" ]; then
for desktopFile in $(find "$dir" -iname "*.desktop"); do
convertDesktopFile "$desktopFile";
done
fi
}
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