Initial commit

.github/workflows/release_a_changelog.yml

@@ -0,0 +1,18 @@
+name: Release a Changelog
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  release_a_changelog:
+    name: Release a Changelog
+    runs-on: self-hosted
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Release a Changelog
+        uses: ./
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'

.gitignore

@@ -0,0 +1 @@
+.idea

CHANGELOG.md

@@ -0,0 +1,11 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres
+to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [v1.0.0] - 2021-05-11
+* Initial release

README.md

@@ -0,0 +1,36 @@
+# Release-a-Changelog action
+This GitHub action creates a release based on your `CHANGELOG.md` file. 
+You must use [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format or this will not work.
+
+
+# Installation
+
+Add the following to a new `.github/workflows/release_a_changelog.yml` file (or as part of your existing workflow):
+```yaml
+name: Release a Changelog
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  release_a_changelog:
+    name: Release a Changelog
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Release a Changelog
+        uses: rasmus-saks/[email protected]
+        with:
+          github-token: '${{ secrets.GITHUB_TOKEN }}'
+```
+
+> :warning: Make sure you have a `checkout` action before `release-a-changelog`, otherwise it won't be able to read your `CHANGELOG.md` file
+
+# Usage
+1. Add a new version to `CHANGELOG.md` according to [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
+2. Push/merge to master
+3. ???
+4. Profit

action.yml

@@ -0,0 +1,11 @@
+name: 'Release a Changelog'
+description: 'Creates a GitHub release based on Keep a Changelog'
+
+runs:
+  using: node12
+  main: 'index.js'
+
+inputs:
+  github-token:
+    description: "GitHub token"
+    required: true

index.js

@@ -0,0 +1,65 @@
+const core = require('@actions/core');
+const github = require('@actions/github');
+const fs = require('fs');
+
+const CHANGELOG_FILE = 'CHANGELOG.md'
+const VERSION_REGEX = /## \[(.+)] - (.+)/
+
+async function run() {
+  const octokit = github.getOctokit(core.getInput("github-token"));
+  const entry = getLatestChangelogEntry()
+  if (!entry) {
+    console.log(`Could not find the latest release from ${CHANGELOG_FILE}`)
+    return
+  }
+
+  try {
+    await octokit.repos.getReleaseByTag({
+      ...github.context.repo,
+      tag: entry.version
+    })
+    console.log(`A release already exists for ${entry.version}, skipping`)
+  } catch (error) {
+    console.log(`Could not find a GitHub release for ${entry.version}, creating one`)
+    octokit.repos.createRelease({
+      ...github.context.repo,
+      tag_name: entry.version,
+      name: entry.version,
+      target_commitish: github.context.sha,
+      body: entry.changelog,
+      draft: false,
+      prerelease: false
+    })
+  }
+}
+
+function getLatestChangelogEntry() {
+  if (fs.existsSync(CHANGELOG_FILE)) {
+    const content = fs.readFileSync(CHANGELOG_FILE);
+    const entry = {
+      version: "",
+      changelog: ""
+    }
+    let inLatestEntry = false
+    for (const line of content.toString().split(/\r?\n/)) {
+      const result = line.match(VERSION_REGEX)
+      if (result) {
+        if (!inLatestEntry) {
+          // Started reading the latest entry
+          inLatestEntry = true;
+          entry.version = result[1];
+        } else {
+          break;
+        }
+      } else if (inLatestEntry) {
+        entry.changelog += line + "\n";
+      }
+    }
+    return entry;
+  }
+}
+
+
+run().catch(error => {
+  core.setFailed(error)
+});