Abstract out reused action code

Author: skyash-dev

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/node
+# Edit at https://www.toptal.com/developers/gitignore?templates=node
+
+### Node ###
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit
+
+# End of https://www.toptal.com/developers/gitignore/api/node

README.md

@@ -1,2 +1,44 @@
 # all-contributors-image
-Generates an image of the icons of all users in all-contributors list
+
+Generates a contributors image (`contributors.png`) from the `.all-contributorsrc` file and opens a pull request with the updated image.
+
+## What it does
+
+- Fetches `.all-contributorsrc` from the repository
+- Extracts contributor avatars
+- Generates a grid image (`contributors.png`)
+- Creates/updates a branch
+- Commits the image
+- Opens a pull request
+
+## Usage
+
+```yaml
+name: Generate Contributors Image
+
+on:
+  push:
+    paths:
+      - .all-contributorsrc
+
+jobs:
+  generate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate contributors image on main branch
+        uses: processing/all-contributors-image@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+```
+
+## Inputs
+
+| name   | required | description                                                                          |
+| ------ | -------- | ------------------------------------------------------------------------------------ |
+| token  | yes      | github token used for api calls                                                      |
+
+## Requirements
+
+Repository must have:
+
+- A valid `.all-contributorsrc` file

action.yml

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+name: Generate Contributors PNG
+description: Github action to generate an image of the icons of all users in all-contributors list
+author: p5.js contributors & The Processing Foundation
+
+inputs:
+  token:
+    description: GitHub token
+
+runs:
+  using: composite
+  steps:
+    - run: npm install
+      shell: bash
+      working-directory: ${{ github.action_path }}
+
+    - run: node index.js
+      shell: bash
+      working-directory: ${{ github.action_path }}
+      env:
+        INPUT_TOKEN: ${{ inputs.token }}

generateImage.js

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+import { createCanvas, loadImage } from "canvas";
+
+export async function generateImage(contributors) {
+  const AVATAR_SIZE = 50;
+  const GAP = 4;
+  const COLS = 40;
+  const ROWS = Math.ceil(contributors.length / COLS);
+
+  const width = COLS * AVATAR_SIZE + (COLS - 1) * GAP;
+  const height = ROWS * AVATAR_SIZE + (ROWS - 1) * GAP;
+
+  const canvas = createCanvas(width, height);
+  const ctx = canvas.getContext("2d");
+
+  for (let i = 0; i < contributors.length; i++) {
+    const c = contributors[i];
+
+    const col = i % COLS;
+    const row = Math.floor(i / COLS);
+
+    const x = col * (AVATAR_SIZE + GAP);
+    const y = row * (AVATAR_SIZE + GAP);
+
+    const img = await loadAvatar(c.avatar_url);
+
+    ctx.save();
+    ctx.beginPath();
+    ctx.arc(
+      x + AVATAR_SIZE / 2,
+      y + AVATAR_SIZE / 2,
+      AVATAR_SIZE / 2,
+      0,
+      Math.PI * 2,
+    );
+    ctx.clip();
+
+    if (img) {
+      ctx.drawImage(img, x, y, AVATAR_SIZE, AVATAR_SIZE);
+    }
+    ctx.restore();
+  }
+  return canvas.toBuffer("image/png");
+}
+
+async function loadAvatar(url) {
+  try {
+    const res = await fetch(url);
+    if (!res.ok) throw new Error(`HTTP ${res.status}`);
+
+    const buffer = Buffer.from(await res.arrayBuffer());
+    return await loadImage(buffer);
+  } catch (err) {
+    return null;
+  }
+}

index.js

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+import core from "@actions/core";
+import github from "@actions/github";
+import { generateImage } from "./generateImage.js";
+
+const context = github.context;
+const owner = context.repo.owner;
+const repo = context.repo.repo;
+
+const token = core.getInput("token", { required: true });
+const baseBranch = "main";
+
+const octokit = github.getOctokit(token);
+const newBranch = "update-contributors-png";
+const filePath = "contributors.png";
+
+const res = await fetch(
+  `https://raw.githubusercontent.com/${owner}/${repo}/${baseBranch}/.all-contributorsrc`,
+);
+if (!res.ok) {
+  throw new Error("failed to fetch .all-contributorsrc");
+}
+const data = await res.json();
+const contributors = data.contributors;
+
+const contentBuffer = await generateImage(contributors);
+const content = contentBuffer.toString("base64");
+
+// get base branch sha
+const { data: baseRef } = await octokit.rest.git.getRef({
+  owner,
+  repo,
+  ref: `heads/${baseBranch}`,
+});
+const baseSha = baseRef.object.sha;
+
+// create branch (or reuse if exists)
+try {
+  await octokit.rest.git.createRef({
+    owner,
+    repo,
+    ref: `refs/heads/${newBranch}`,
+    sha: baseSha,
+  });
+} catch (e) {
+  // update branch, if already exists
+  await octokit.rest.git.updateRef({
+    owner,
+    repo,
+    ref: `heads/${newBranch}`,
+    sha: baseSha,
+    force: true,
+  });
+}
+
+// check if file already exists on branch
+let existingSha = undefined;
+try {
+  const { data } = await octokit.rest.repos.getContent({
+    owner,
+    repo,
+    path: filePath,
+    ref: newBranch,
+  });
+
+  if (!Array.isArray(data) && data.sha) {
+    existingSha = data.sha;
+  }
+} catch {
+  // file does not exist
+}
+
+// create/update file and commit
+try {
+  await octokit.rest.repos.createOrUpdateFileContents({
+    owner,
+    repo,
+    path: filePath,
+    message: "Update contributors.png from .all-contributorsrc",
+    content,
+    branch: newBranch,
+    ...(existingSha && { sha: existingSha }),
+  });
+} catch (e) {
+  core.setFailed(e.message);
+}
+
+// create pull request if not exists
+const { data: prs } = await octokit.rest.pulls.list({
+  owner,
+  repo,
+  head: `${owner}:${newBranch}`,
+  base: baseBranch,
+  state: "open",
+});
+if (prs.length === 0) {
+  await octokit.rest.pulls.create({
+    owner,
+    repo,
+    title: "chore: update contributors.png from .all-contributorsrc",
+    head: newBranch,
+    base: baseBranch,
+    body: "This PR updates the contributors.png to reflect changes in .all-contributorsrc",
+  });
+}

package.json

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+{
+  "name": "all-contributors-image",
+  "version": "0.1.0",
+  "description": "Github action to generate an image of the icons of all users in all-contributors list",
+  "type": "module",
+  "main": "index.js",
+  "author": "p5.js contributors & The Processing Foundation",
+  "license": "MIT",
+  "dependencies": {
+    "@actions/core": "^1.11.1",
+    "@actions/github": "^6.0.1",
+    "canvas": "^3.2.3"
+  }
+}