Initial commit

Author: zgosalvez

LICENSE.md

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+MIT License
+
+Copyright (c) 2020 Zennon Gosalvez
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# GitHub Action — Get Flutter Version
+
+This GitHub Action (written in composite run steps) allows you to leverage GitHub Actions to get the [Flutter](https://flutter.dev) environment version from the pubspec file. This is primarily used before using the [Flutter action](https://github.com/marketplace/actions/flutter-action).
+
+## Usage
+### Pre-requisites
+Create a workflow `.yml` file in your `.github/workflows` directory. An [example workflow](#example-workflow---create-a-release) is available below. For more information, reference the GitHub Help Documentation for [Creating a workflow file](https://help.github.com/en/articles/configuring-a-workflow#creating-a-workflow-file).
+
+### Inputs
+None.
+
+### Outputs
+* `version`: The Flutter version
+
+### Common workflow
+
+1. Your `pubspec.yaml` file must contain the Flutter version under the `environment:flutter:` key. For example:
+```yaml
+environment:
+  flutter: 1.22.4
+```
+2. Use the action's output as an input to [Flutter action](https://github.com/marketplace/actions/flutter-action). For example:
+```yaml
+on: push
+
+name: Sample Workflow
+
+jobs:
+  build:
+    name: Examaple
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Get Flutter Version
+        id: get-flutter-version
+        use: zgosalvez/[email protected]
+      - name: Set up Flutter
+        uses: subosito/flutter-action@v1
+        with:
+          flutter-version: ${{ steps.get-flutter-version.outputs.version }}
+```
+
+## Shout-out
+A special mention goes to [@daohoangson](https://github.com/daohoangson), who came up with the solution at [subosito/flutter-action/issues/47#issuecomment-675821988](https://github.com/subosito/flutter-action/issues/47#issuecomment-675821988).
+
+## License
+The scripts and documentation in this project are released under the [MIT License](LICENSE)

action.yml

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+name: 'Get Flutter Version'
+description: 'Get the Flutter environment version from the pubspec file'
+outputs:
+  version: 
+    description: "The Flutter version"
+    value: ${{ steps.get-flutter-version.outputs.version }}
+runs:
+  using: "composite"
+  steps: 
+    - id: get-flutter-version
+      run: | # https://github.com/subosito/flutter-action/issues/47#issuecomment-675821988
+        set -e
+
+        brew install yq
+        echo "::set-output name=version::$( yq read pubspec.yaml environment.flutter )"
+      shell: bash
+branding:
+  icon: 'minimize'
+  color: 'blue'