name: Vim Theme Preview
on:
pull_request:
paths:
- 'home/.vimrc'
permissions:
contents: write
pull-requests: write
jobs:
preview:
name: Generate theme preview
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Setup Node.js
uses: actions/setup-node@v4
with:
node-version: '20'
- name: Install Playwright
run: |
npm install playwright
npx playwright install chromium --with-deps
- name: Generate HTML preview and take screenshots
uses: actions/github-script@v7
with:
script: |
const fs = require('fs');
// === GENERATE HTML PREVIEW ===
const vimrc = fs.readFileSync('home/.vimrc', 'utf8');
// Parse highlight definitions
const highlights = {};
const highlightRegex = /^highlight\s+(\w+)\s+(.+)$/gm;
let match;
while ((match = highlightRegex.exec(vimrc)) !== null) {
const [, group, attrs] = match;
const parsed = {};
const guifg = attrs.match(/guifg=(#?\w+)/);
const guibg = attrs.match(/guibg=(#?\w+)/);
const gui = attrs.match(/gui=(\S+)/);
if (guifg) parsed.fg = guifg[1];
if (guibg) parsed.bg = guibg[1];
if (gui) parsed.style = gui[1];
highlights[group] = parsed;
}
function toStyle(group) {
const h = highlights[group] || {};
let style = '';
if (h.fg && h.fg !== 'NONE') style += `color:${h.fg};`;
if (h.bg && h.bg !== 'NONE') style += `background:${h.bg};`;
if (h.style) {
if (h.style.includes('bold')) style += 'font-weight:bold;';
if (h.style.includes('italic')) style += 'font-style:italic;';
if (h.style.includes('underline')) style += 'text-decoration:underline;';
}
return style;
}
const html = `
Vim Color Scheme Preview
Vim Color Scheme Preview
Python
Python
import os
from typing import Optional
@dataclass
class User:
# User model
name: str
age: int = 0
active: bool = True
def process(data: Optional[str]) → float:
if data is None:
raise ValueError("No data")
return 3.14
TypeScript
TypeScript
import { useState } from 'react';
interface Props {
name: string;
count?: number;
}
const Button = ({ name, count = 0 }: Props) => {
const [active, setActive] = useState(false);
return (
<button onClick={() => setActive(true)}>
{name}: {count}
</button>
);
};
Go
Go
package main
import (
"fmt"
"errors"
)
type User struct {
Name string
Active bool
}
func process(id int) (*User, error) {
if id < 0 {
return nil, errors.New("invalid")
}
return &User{Active: true}, nil
}
Ruby
Ruby
require 'json'
class User
attr_accessor :name, :active
def initialize(name)
@name = name
@active = true
end
def greet
"Hello, #{@name}!"
end
end
users = [1, 2, 3].map { |id| User.new("user_#{id}") }
Markdown
Markdown
# Main Heading
## Section Title
### Subsection
Regular paragraph text with **bold** and *italic* text.
- List item one
- List item two
Here's a [link to docs](https://example.com) in the text.
Inline \`code\` and a code block:
\`\`\`javascript
const x = 42;
\`\`\`
Git Diff
Diff
diff --git a/file.txt b/file.txt
index abc123..def456 100644
@@ -1,5 +1,5 @@
unchanged line
-removed line
+added line
another unchanged
UI Elements
Messages
Warning: File has been modified outside of Vim
E488: Trailing characters: xyz
Press ENTER or type command to continue
Save changes? [Y]es, [N]o, [C]ancel:
-- INSERT --
TODO: Fix this later
`;
fs.writeFileSync('/tmp/preview.html', html);
console.log('Generated /tmp/preview.html');
- name: Take screenshots
run: |
node << 'EOF'
const { chromium } = require('playwright');
const fs = require('fs');
(async () => {
fs.mkdirSync('/tmp/screenshots', { recursive: true });
const browser = await chromium.launch();
const page = await browser.newPage();
// Use tall viewport to ensure all elements render with correct bounding boxes
await page.setViewportSize({ width: 1200, height: 4000 });
await page.goto('file:///tmp/preview.html');
await page.waitForLoadState('networkidle');
const sections = ['python', 'typescript', 'go', 'ruby', 'markdown', 'diff', 'ui'];
for (const id of sections) {
const heading = await page.$(`#${id}`);
const pre = await page.$(`#${id} + pre`);
if (!heading || !pre) {
console.log(`Skipped: ${id} (not found)`);
continue;
}
// Create a wrapper div for combined screenshot
const headingBox = await heading.boundingBox();
const preBox = await pre.boundingBox();
if (!headingBox || !preBox) continue;
const padding = 16;
const clip = {
x: Math.max(0, Math.min(headingBox.x, preBox.x) - padding),
y: Math.max(0, headingBox.y - padding),
width: Math.max(headingBox.width, preBox.width) + padding * 2,
height: (preBox.y + preBox.height) - headingBox.y + padding * 2
};
await page.screenshot({ path: `/tmp/screenshots/${id}.png`, clip });
console.log(`Captured: ${id}.png`);
}
await browser.close();
})();
EOF
- name: Upload images and create PR comment
uses: actions/github-script@v7
with:
script: |
const fs = require('fs');
const { owner, repo } = context.repo;
const prNumber = context.issue.number;
const sha = context.payload.pull_request.head.sha.slice(0, 7);
const files = fs.readdirSync('/tmp/screenshots').filter(f => f.endsWith('.png'));
const labels = {
python: 'Python', typescript: 'TypeScript',
go: 'Go', ruby: 'Ruby', markdown: 'Markdown', diff: 'Git Diff', ui: 'UI Elements'
};
// Create release for this commit
const tag = `vim-preview-${sha}`;
const { data: release } = await github.rest.repos.createRelease({
owner, repo, tag_name: tag,
name: `Preview ${sha}`,
body: `PR #${prNumber}`,
prerelease: true
});
// Upload images
const urls = {};
for (const file of files) {
const { data: asset } = await github.rest.repos.uploadReleaseAsset({
owner, repo, release_id: release.id, name: file,
data: fs.readFileSync(`/tmp/screenshots/${file}`)
});
urls[file.replace('.png', '')] = asset.browser_download_url;
}
// Hide previous preview comments
const { data: comments } = await github.rest.issues.listComments({
owner, repo, issue_number: prNumber
});
for (const c of comments) {
if (c.user.type === 'Bot' && c.body.includes('')) {
await github.graphql(`mutation { minimizeComment(input: {subjectId: "${c.node_id}", classifier: OUTDATED}) { clientMutationId } }`);
}
}
// Create new comment
const fullSha = context.payload.pull_request.head.sha;
const commitUrl = `https://github.com/${owner}/${repo}/commit/${fullSha}`;
const workflowUrl = `https://github.com/${owner}/${repo}/actions/runs/${context.runId}`;
let body = `\n## Vim Theme Preview\n\nCommit: ${commitUrl}\n\n`;
for (const [name, url] of Object.entries(urls)) {
body += `${labels[name] || name}
\n\n\n\n