rewrite flutter-action

.github/workflows/workflow.yml

@@ -7,16 +7,10 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
+        channel: [stable, beta, dev]
     steps:
     - name: Checkout
       uses: actions/checkout@v2
-    - name: Set Node.js 10.x
-      uses: actions/setup-node@v1
+    - uses: ./
       with:
-        node-version: 10.x
-    - name: npm install
-      run: npm install
-    - name: Lint
-      run: npm run format-check
-    - name: npm test
-      run: npm test
+        channel: ${{ matrix.channel }}

action.yml

@@ -1,6 +1,9 @@
 name: 'Flutter action'
 description: 'Setup your runner with Flutter environment'
 author: 'Alif Rachmawadi'
+branding:
+  icon: 'maximize'
+  color: 'blue'
 inputs:
   flutter-version:
     description: 'The Flutter version to make available on the path'
@@ -10,8 +13,7 @@ inputs:
     required: false
     default: 'stable'
 runs:
-  using: 'node12'
-  main: 'dist/index.js'
-branding:
-  icon: 'maximize'
-  color: 'blue'
+  using: 'composite'
+  steps:
+    - run: $GITHUB_ACTION_PATH/setup.sh ${{ inputs.channel }} ${{ inputs.flutter-version }}
+      shell: bash

setup.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+OS_NAME=$(echo "$OS" | awk '{print tolower($0)}')
+MANIFEST_URL="https://storage.googleapis.com/flutter_infra_release/releases/releases_$OS_NAME.json"
+
+# convert version like 2.5.x to 2.5
+normalize_version() {
+  if [[ $1 == *x ]]; then
+    echo ${1::-2}
+  else
+    echo $1
+  fi
+}
+
+latest_version() {
+  jq --arg channel "$1" '.releases | map(select(.channel==$channel)) | first'
+}
+
+wildcard_version() {
+  jq --arg channel "$1" --arg version "^$2" '.releases | map(select(.channel==$channel) | select(.version | test($version))) | first'
+}
+
+get_version() {
+  if [[ -z $2 ]]; then
+    latest_version $1
+  else
+    wildcard_version $1 $2
+  fi
+}
+
+get_version_manifest() {
+  releases_manifest=$(curl --silent --connect-timeout 15 --retry 5 $MANIFEST_URL)
+  version_manifest=$(echo $releases_manifest | get_version $1 $(normalize_version $2))
+
+  if [[ $version_manifest == null ]]; then
+    # fallback through legacy version format
+    echo $releases_manifest | wildcard_version $1 "v$(normalize_version $2)"
+  else
+    echo $version_manifest
+  fi
+}
+
+CHANNEL="$1"
+VERSION="$2"
+VERSION_MANIFEST=$(get_version_manifest $CHANNEL $VERSION)
+
+echo $OS_NAME
+echo $MANIFEST_URL
+echo $CHANNEL
+echo $VERSION
+echo $VERSION_MANIFEST
+