Initial commit

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{json,md,yaml,yml}]
+indent_size = 2

.gitattributes

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+* text=auto

.github/workflows/main.yaml

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+on:
+  - push
+  - pull_request
+
+name: Main
+
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.7'
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: mtkennerly/dunamai-action@v1
+        with:
+          env-var: MY_VERSION
+          args: --style semver
+      - run: echo $MY_VERSION
+
+  complete:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.7'
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: mtkennerly/dunamai-action@v1
+        with:
+          install: '1.2.0'
+          env-var: MY_VERSION
+          command: dunamai from git
+          args: --style semver
+      - run: echo $MY_VERSION

.gitignore

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+node_modules/
+tmp*/
+.vscode/
+*.tgz
+*.log

LICENSE

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+MIT License
+
+Copyright (c) 2020 Matthew T. Kennerly (mtkennerly)
+
+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 for Dunamai
+This repository provides a GitHub Action that uses
+[Dunamai](https://github.com/mtkennerly/dunamai)
+to determine a dynamic version from your VCS tags.
+
+## Inputs
+* `install` (optional, default: `"latest"`):
+  Version of Dunamai to install (e.g., "1.3.0").
+  Use the default if you don't need a specific version,
+  or use "none" if your workflow installs Dunamai by other means.
+* `env-var` (optional, default: `""`):
+  Name of environment variable in which to set the dynamic version.
+  If this is empty, no environment variable will be set.
+* `command` (optional, default: `"dunamai from any"`)
+  Command to run Dunamai.
+* `args` (optional, default: `""`):
+  Additional arguments to pass to the command.
+
+## Outputs
+* `version`: The dynamic version.
+
+## Example
+```yaml
+jobs:
+  example:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.7'
+      - uses: actions/checkout@v2
+        with:
+          # This is necessary so that we have the tags.
+          fetch-depth: 0
+      - uses: mtkennerly/dunamai-action@v1
+        with:
+          env-var: MY_VERSION
+          args: --style semver
+      - run: echo $MY_VERSION
+```

action.yaml

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+name: Dunamai
+description: |
+  Use Dunamai to determine a dynamic version from your VCS tags.
+  This requires access to Python in the workflow.
+inputs:
+  install:
+    description: |
+      Version of Dunamai to install (e.g., "1.3.0").
+      Use the default if you don't need a specific version,
+      or use "none" if your workflow installs Dunamai by other means.
+    required: false
+    default: latest
+  env-var:
+    description: |
+      Name of environment variable in which to set the dynamic version.
+      If this is empty, no environment variable will be set.
+    required: false
+    default: ''
+  command:
+    description: Command to run Dunamai.
+    required: false
+    default: 'dunamai from any'
+  args:
+    description: Additional arguments to pass to the command.
+    required: false
+    default: ''
+outputs:
+  version:
+    description: The dynamic version.
+runs:
+  using: node12
+  main: index.js

index.js

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+const core = require("@actions/core");
+const { execSync } = require("child_process");
+
+function runCommand(command) {
+    console.log(`Running command: ${command}`);
+    return execSync(command);
+}
+
+function main() {
+    const install = core.getInput("install");
+    const envVar = core.getInput("env-var");
+    const command = core.getInput("command");
+    const args = core.getInput("args");
+
+    if (dunamaiVersion === "none") {
+        // No install.
+    } else if (dunamaiVersion === "latest") {
+        runCommand("pip install dunamai");
+    } else {
+        runCommand(`pip install dunamai==${dunamaiVersion}`);
+    }
+
+    const version = runCommand(`${command} ${args}`).toString();
+    core.setOutput("version", version);
+    console.log(`Dynamic version: ${version}`);
+
+    if (envVar !== "") {
+        console.log(`Setting environment variable: ${envVar}`);
+        core.exportVariable(envVar, version);
+    }
+}
+
+try {
+    main();
+} catch (error) {
+    core.setFailed(error.message);
+}

package-lock.json

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+{
+  "name": "dunamai-action",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@actions/core": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.4.tgz",
+      "integrity": "sha512-YJCEq8BE3CdN8+7HPZ/4DxJjk/OkZV2FFIf+DlZTC/4iBlzYCD5yjRR6eiOS5llO11zbRltIRuKAjMKaWTE6cg=="
+    }
+  }
+}

package.json

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+{
+  "name": "dunamai-action",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "keywords": [],
+  "author": "",
+  "license": "MIT",
+  "dependencies": {
+    "@actions/core": "^1.2.4"
+  },
+  "devDependencies": {}
+}