add an installation script

install.sh

@@ -0,0 +1,169 @@
+#!/bin/sh
+set -e
+
+installer_dir="${XDG_DATA_HOME:-$HOME/.local/share}/inputactions-installer"
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --ctl)
+            build_ctl=1
+            shift
+            ;;
+        --ctl-branch)
+            ctl_branch=$2
+            shift
+            shift
+            ;;
+        --kwin)
+            build_kwin=1
+            shift
+            ;;
+        --kwin-branch)
+            kwin_branch=$2
+            shift
+            shift
+            ;;
+        --standalone)
+            build_standalone=1
+            shift
+            ;;
+        --standalone-branch)
+            standalone_branch=$2
+            shift
+            shift
+            ;;
+        --standalone-no-systemd)
+            standalone_no_systemd=1
+            shift
+            ;;
+
+        --latest)
+            latest=1
+            shift
+            ;;
+        --latest-stable)
+            latest_stable=1
+            shift
+            ;;
+
+        -p|--package)
+            cpack_generator=$2
+            shift
+            shift
+            ;;
+
+        -d|--debug)
+            debug=1
+            shift
+            ;;
+
+        -h|--help|*)
+            cat << EOF
+Usage: $0 [options]
+
+Options:
+  --ctl                         Build the control tool
+  --ctl-branch <branch>         Build a custom Git branch of the control tool (checks out the specified branch)
+  --kwin                        Build the KWin implementation (mutually exclusive with --standalone)
+  --kwin-branch <branch>        Build a custom Git branch of the KWin implementation (checks out the specified branch)
+  --standalone                  Build the standalone implementation (mutually exclusive with --kwin)
+  --standalone-branch <branch>  Build a custom Git branch of the standalone implementation (checks out the specified branch)
+  --standalone-no-systemd       Disable systemd support
+
+  --latest                      Build the latest Git commits of all projects (checks out the main branch)
+  --latest-stable               Build the latest stable releases of all projects (checks out the latest tag or the main branch if there are none)
+
+  -d,--debug                    Build the debug configuration
+  -p,--package <generator>      Generate packages using the specified CPack generator instead of installing
+
+  -h,--help                     Show this message and exit
+
+The installer stores data in "$installer_dir".
+EOF
+            exit 0
+            ;;
+    esac
+done
+
+build_dir="$installer_dir/build"
+kwin_dir="$installer_dir/kwin"
+standalone_dir="$installer_dir/standalone"
+
+mkdir -p $installer_dir
+cmakelists_file="$installer_dir/CMakeLists.txt"
+cat > $cmakelists_file << EOF
+cmake_minimum_required(VERSION 3.16.0)
+project(inputactions_installer)
+EOF
+
+cmake_flags="-DCMAKE_INSTALL_PREFIX=/usr"
+if [[ -n $debug ]]; then
+    cmake_flags="$cmake_flags -DCMAKE_BUILD_TYPE=Debug"
+fi
+if [[ -n $standalone_no_systemd ]]; then
+    cmake_flags="$cmake_flags -DINPUTACTIONS_SYSTEMD=OFF"
+fi
+
+cmakelists="cmake_minimum_required(VERSION 3.16.0)\nproject(inputactions_installer)"
+
+function ensure_repository() {
+    repo_name="$1"
+    repo_branch="$2"
+
+    repo_dir="$installer_dir/$1"
+    if [[ ! -d "$repo_dir" ]]; then
+        git clone --recursive "https://github.com/InputActions/$repo_name" "$repo_dir"
+    fi
+    if [[ -n "$repo_branch" ]]; then
+        git -C "$repo_dir" fetch
+        git -C "$repo_dir" checkout "$repo_branch"
+        git -C "$repo_dir" submodule update --init --recursive
+    elif [[ -n $latest ]]; then
+        git -C "$repo_dir" checkout main
+        git -C "$repo_dir" pull
+        git -C "$repo_dir" submodule update --init --recursive
+    elif [[ -n $latest_stable ]]; then
+        git -C "$repo_dir" fetch
+        git -C "$repo_dir" checkout "$(git -C "$repo_dir" describe --tags "$(git -C "$repo_dir" rev-list --tags --max-count=1)" 2> /dev/null || echo main)"
+        git -C "$repo_dir" submodule update --init --recursive
+    fi
+}
+
+if [[ -n $build_ctl ]]; then
+    echo -e "add_subdirectory(ctl)" >> $cmakelists_file
+    ensure_repository "ctl" "$ctl_branch"
+fi
+if [[ -n $build_kwin ]]; then
+    echo -e "add_subdirectory(kwin)" >> $cmakelists_file
+    ensure_repository "kwin" "$kwin_branch"
+elif [[ -n $build_standalone ]]; then
+    echo -e "add_subdirectory(standalone)" >> $cmakelists_file
+    ensure_repository "standalone" "$standalone_branch"
+fi
+
+if [[ ! -n $build_ctl && ! -n $build_kwin && ! -n $build_standalone ]]; then
+    echo "No build target specified."
+    exit 1
+fi
+
+if [[ -d "$build_dir" ]]; then
+    make -C "$build_dir" clean || true
+else
+    mkdir "$build_dir"
+fi
+
+cmake --fresh -B"$build_dir" -S"$installer_dir" $cmake_flags
+make -C "$build_dir" -j$(nproc)
+
+if [[ -n "$cpack_generator" ]]; then
+    if [[ -n $build_ctl ]]; then
+        cpack -B "$installer_dir" -G "$cpack_generator" --config "$build_dir/ctl/CPack.cmake"
+    fi
+    if [[ -n $build_kwin ]]; then
+        cpack -B "$installer_dir" -G "$cpack_generator" --config "$build_dir/kwin/CPack.cmake"
+    elif [[ -n $build_standalone ]]; then
+        cpack -B "$installer_dir" -G "$cpack_generator" --config "$build_dir/standalone/CPack.cmake"
+    fi
+else
+    sudo make -C "$build_dir" install
+fi