Add contributors image generation action

.gitignore

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README.md

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 # 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
+- `GITHUB_TOKEN` must be configured with the appropriate workflow permissions:
+  - enable read and write permissions
+  - enable allow github actions to create and approve pull requests

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 ci
+      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}/${baseBranch}/.all-contributorsrc`,
+);
+if (!res.ok) {
+  throw new Error("failed to fetch .all-contributorsrc");
+}
+const data = await res.json();
+const contributors = data.contributors;
+
+const contentBuffer = await generateImage(contributors);
+let existingBuffer = null;
+
+try {
+  const existing = await fetch(
+    `https://raw.githubusercontent.com/${owner}/${repo}/${baseBranch}/contributors.png`,
+  );
+
+  if (existing.ok) {
+    const arrayBuffer = await existing.arrayBuffer();
+    existingBuffer = Buffer.from(arrayBuffer);
+  }
+} catch {
+  // file doesn't exist
+}
+
+if(existingBuffer && contentBuffer.equals(existingBuffer)) process.exit(0);
+
+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",
+  });
+}