joplin-icon-changer.sh

#!/bin/bash

## Author: Michael Gauci
## Description: Update the icon files of the Joplin AppImage. Tested on 2.14.23.
## License: MIT
## Version: 1.0

shopt -s globstar nullglob

DESKTOP_ICON=$1
PANEL_ICON=$2
APPIMAGE_NAME=$3

chmod -R 755 "./$APPIMAGE_NAME"
"./$APPIMAGE_NAME" --appimage-extract

icon_sizes=(
    ['16']='16x16'
    ['24']='24x24'
    ['32']='32x32'
    ['48']='48x48'
    ['72']='72x72'
    ['96']='96x96'
    ['128']='128x128'
    ['144']='144x144'
    ['256']='256x256'
    ['512']='512x512'
    ['1024']='1024x1024'
)

for icon_path in ./squashfs-root/**/*.png; do
    unset size
    for icon_size in "${!icon_sizes[@]}"; do
        if [[ "$icon_path" == *"${icon_sizes[$icon_size]}"* ]]; then
            if [[ "$icon_path" == *'@2'* ]]; then
                size=$((icon_size * 2))
            elif [[ "$icon_path" == *'@3'* ]]; then
                size=$((icon_size * 3))
            else
                size="$icon_size"
            fi
        fi
    done
    if ! [ -v size ]; then
        continue
    fi
    icon_source=$([[ "$icon_path" == *'16x16'* ]] && echo "$PANEL_ICON" || echo "$DESKTOP_ICON")
    inkscape -w "$size" -h "$size" -o "$icon_path" --export-type=png "$icon_source"
done

cp ./squashfs-root/resources/build/icons/256x256.png ./squashfs-root/joplin.png

ARCH=x86_64 appimagetool -v squashfs-root