Create AppImage from Flutter App Linux

appimage_builder

#! /bin/bash

export ARCH=$(uname -m)

echo "INFO:Generator:Searching AppDir" 
read -p "? ID [Eg: com.example.app]: " appId
read -p "? Application Name: " appName
read -p "? Icon: " appIcon
read -p "? Executable path relative to AppDir [usr/bin/app]: " appExec
# read -p "? Arguments [Default: $@]: " appExec_args
read -p "? Version [Eg: 1.0.0]: " appVersion
# read -p "? Update Information [Default: guess]: " guess
# read -p "? Architecture: " x86_64

function download_appimagetool() {
  if [ ! -d ./appimage-build ]; then mkdir ./appimage-build; fi
  if [ ! -x ./appimage-build/appimagetool-$ARCH.AppImage ]; then
    curl -L -o ./appimage-build/appimagetool-$ARCH.AppImage https://github.com/AppImage/AppImageKit/releases/download/continuous/appimagetool-$ARCH.AppImage
    chmod a+x ./appimage-build/appimagetool-$ARCH.AppImage 
  fi
}

function create_appdir() {
  if [ -d "$appName.AppDir" ]; then rm -rf $appName.AppDir; fi
  mkdir $appName.AppDir
}

function after_bundle() {
  cp build/linux/x64/release/bundle/assistant $appName.AppDir
  cp -r build/linux/x64/release/bundle/lib/. $appName.AppDir/lib
  cp -r build/linux/x64/release/bundle/data $appName.AppDir
  # cp $appIcon AppDir/usr/share/icons/

  # cp -r build/linux/*/release/bundle/ $appName.AppDir

  # if [[ $(file -b "$appIcon.[ps]*g") =~  ]];

  if [ ! -b "$appIcon.[ps]*g" ]; then 
    cp $appIcon.[ps]*g $appName.AppDir
    # mkdir -p $appName.AppDir/usr/share/icons/
    # cp $appIcon.[ps]*g $appName.AppDir/usr/share/icons/
  fi
}

function create_apprun() {
  touch AppRun
  echo -e '#!/bin/sh\n\ncd "$(dirname "$0")"\nexec ./'$appExec'' > AppRun
  chmod +x AppRun
  mv AppRun $appName.AppDir
}

function create_desktop() {
  local de="[Desktop Entry]"
  local xaa="X-AppImage-Arch=$ARCH"
  local xav="X-AppImage-Version=$appVersion"
  local xan="X-AppImage-Name=$appName"
  local v="Version=1.0"
  local ty="Type=Application"
  local te="Terminal=false"
  local n="Name=$appName"
  local e="Exec=$appExec %u"
  local i="Icon=$appIcon"
  local ca="Categories=Utility;"
  local co="Comment="

  touch $appId.desktop
  echo -e "$de\n$xaa\n$xav\n$xan\n$v\n$ty\n$te\n$n\n$e\n$i\n$ca\n$co" > $appId.desktop
  mv $appId.desktop $appName.AppDir
}

function build_appimage() {
  # the build command itself:
  ./appimage-build/appimagetool-$ARCH.AppImage $appName.AppDir 

  # move result in build folder

  mv $appName-$ARCH.AppImage ./appimage-build/$appName-$appVersion-$ARCH.AppImage

}


download_appimagetool
create_appdir
after_bundle
create_apprun
create_desktop
build_appimage