CI and custom build script utilities

- macOS DMG image using AppDMG with custom background
- Linux AppImage
- Windows MSYS2 packaging
- Source code tarball including subprojects source code
- LHelper compatible build script

scripts/source-package.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+set -ex
+
+if [ ! -e "src/api/api.h" ]; then
+  echo "Please run this script from the root directory of Lite XL."
+  exit 1
+fi
+
+show_help(){
+  echo
+  echo "Usage: $0 <OPTIONS>"
+  echo
+  echo "Available options:"
+  echo
+  echo "-b --builddir DIRNAME     Sets the name of the build directory (no path)."
+  echo "                          Default: 'build'."
+  echo "-d --destdir DIRNAME      Sets the name of the install directory (no path)."
+  echo
+}
+
+BUILD_DIR=build
+DEST_DIR=lite-xl-src
+
+for i in "$@"; do
+  case $i in
+    -h|--belp)
+      show_help
+      exit 0
+      ;;
+    -b|--builddir)
+      BUILD_DIR="$2"
+      shift
+      shift
+      ;;
+    -d|--destdir)
+      DEST_DIR="$2"
+      shift
+      shift
+      ;;
+    *)
+      # unknown option
+      ;;
+  esac
+done
+
+if [[ -n $1 ]]; then
+  show_help
+  exit 1
+fi
+
+if test -d ${BUILD_DIR}; then rm -rf ${BUILD_DIR}; fi
+if test -d ${DEST_DIR}; then rm -rf ${DEST_DIR}; fi
+if test -f ${DEST_DIR}.tar.gz; then rm ${DEST_DIR}.tar.gz; fi
+
+meson subprojects download
+meson setup ${BUILD_DIR}
+
+rsync -arv \
+  --exclude /*build*/ \
+  --exclude *.git* \
+  --exclude lhelper \
+  --exclude lite-xl* \
+  --exclude submodules \
+  . ${DEST_DIR}
+
+cp "${BUILD_DIR}/start.lua" "${DEST_DIR}/data/core"
+
+tar rf ${DEST_DIR}.tar ${DEST_DIR}
+gzip -9 ${DEST_DIR}.tar