add actions/cache support

.github/workflows/workflow.yml

@@ -16,9 +16,9 @@ jobs:
     - name: Print FLUTTER_ROOT
       shell: bash
       run: echo "FLUTTER_ROOT set to $FLUTTER_ROOT"
-    - name: Print PUBCACHE
+    - name: Print PUB_CACHE
       shell: bash
-      run: echo "PUBCACHE set to $PUBCACHE"
+      run: echo "PUB_CACHE set to $PUB_CACHE"
     - name: Run dart --version
       shell: bash
       run: dart --version
@@ -72,3 +72,22 @@ jobs:
     - name: Run flutter --version
       shell: bash
       run: flutter --version
+  test_with_cache:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      with:
+        path: ${{ runner.tool_cache }}/flutter
+        key: flutter-2.5.0-stable
+    - uses: ./
+      with:
+        channel: stable
+        flutter-version: 2.5.0
+    - name: Run dart --version
+      shell: bash
+      run: dart --version
+    - name: Run flutter --version
+      shell: bash
+      run: flutter --version

README.md

@@ -1,8 +1,8 @@
 # flutter-action
 
-This action sets up a flutter environment for use in actions. It works on Linux, Windows, and macOS.
+Flutter environment for use in GitHub Actions. It works on Linux, Windows, and macOS.
 
-# Usage
+## Usage
 
 Use specific version and channel:
 
@@ -113,22 +113,51 @@ jobs:
      - run: flutter build windows
 ```
 
-Matrix Testing:
+Build for Linux desktop:
 
 ```yaml
 jobs:
-  test:
-    name: Test on ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-    steps:
-      - uses: actions/checkout@v2
-      - uses: subosito/flutter-action@v2
-        with:
-          flutter-version: '1.20.2'
-          channel: 'beta'
-      - run: dart --version
-      - run: flutter --version
+ build:
+   runs-on: ubuntu-latest
+   steps:
+     - uses: actions/checkout@v2
+     - uses: subosito/flutter-action@v2
+       with:
+         channel: beta
+     - run: |
+        sudo apt-get update -y
+        sudo apt-get install -y ninja-build libgtk-3-dev
+     - run: flutter config --enable-linux-desktop
+     - run: flutter build linux
+```
+
+Build for macOS desktop:
+
+```yaml
+jobs:
+ build:
+   runs-on: macos-latest
+   steps:
+     - uses: actions/checkout@v2
+     - uses: subosito/flutter-action@v2
+       with:
+         channel: beta
+     - run: flutter config --enable-macos-desktop
+     - run: flutter build macos
+```
+
+Integration with actions/cache:
+
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/cache@v2
+  with:
+    path: ${{ runner.tool_cache }}/flutter
+    key: flutter-2.5.0-stable
+- uses: subosito/flutter-action@v2
+  with:
+    channel: stable
+    flutter-version: 2.5.0
+- run: flutter --version
 ```

setup.sh

@@ -64,31 +64,33 @@ download_archive() {
 CHANNEL="$1"
 VERSION="$2"
 
-if [[ $CHANNEL == master ]]; then
-  git clone -b master https://github.com/flutter/flutter.git "$RUNNER_TOOL_CACHE/flutter"
-else
-  VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
-
-  if [[ $VERSION_MANIFEST == null ]]; then
-    echo "Unable to determine Flutter version for $CHANNEL $VERSION"
-    exit 1
-  fi
-
-  ARCHIVE_PATH=$(echo $VERSION_MANIFEST | jq -r '.archive')
-  download_archive "$ARCHIVE_PATH" "$RUNNER_TOOL_CACHE"
-fi
-
 if [[ $OS_NAME == windows ]]; then
   FLUTTER_ROOT="${RUNNER_TOOL_CACHE}\\flutter"
-  PUBCACHE="${USERPROFILE}\\.pub-cache"
+  PUB_CACHE="${USERPROFILE}\\.pub-cache"
 else
   FLUTTER_ROOT="${RUNNER_TOOL_CACHE}/flutter"
-  PUBCACHE="${HOME}/.pub-cache"
+  PUB_CACHE="${HOME}/.pub-cache"
+fi
+
+if [[ ! -x "${FLUTTER_ROOT}/bin/flutter" ]]; then
+  if [[ $CHANNEL == master ]]; then
+    git clone -b master https://github.com/flutter/flutter.git "$RUNNER_TOOL_CACHE/flutter"
+  else
+    VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
+
+    if [[ $VERSION_MANIFEST == null ]]; then
+      echo "Unable to determine Flutter version for $CHANNEL $VERSION"
+      exit 1
+    fi
+
+    ARCHIVE_PATH=$(echo $VERSION_MANIFEST | jq -r '.archive')
+    download_archive "$ARCHIVE_PATH" "$RUNNER_TOOL_CACHE"
+  fi
 fi
 
 echo "FLUTTER_ROOT=${FLUTTER_ROOT}" >>$GITHUB_ENV
-echo "PUB_CACHE=${PUBCACHE}" >>$GITHUB_ENV
+echo "PUB_CACHE=${PUB_CACHE}" >>$GITHUB_ENV
 
 echo "${FLUTTER_ROOT}/bin" >>$GITHUB_PATH
 echo "${FLUTTER_ROOT}/bin/cache/dart-sdk/bin" >>$GITHUB_PATH
-echo "${PUBCACHE}/bin" >>$GITHUB_PATH
+echo "${PUB_CACHE}/bin" >>$GITHUB_PATH