Add PR review feature.

Author: cpojer

bin/arguments.js

@@ -6,6 +6,18 @@ const commitHashPattern = /^[0-9a-f]{4,64}$/i;
 
 const isCommitHashArgument = (arg) => commitHashPattern.test(arg) && !existsSync(resolve(arg));
 
+const isPullRequestUrlArgument = (arg) => {
+  try {
+    const url = new URL(arg);
+    return (
+      url.hostname.toLowerCase() === 'github.com' &&
+      /^\/[^/]+\/[^/]+\/pull\/\d+\/?$/.test(url.pathname)
+    );
+  } catch {
+    return false;
+  }
+};
+
 export const parseArguments = (args) => {
   const { positionals, values } = parseArgs({
     allowPositionals: true,
@@ -23,10 +35,13 @@ export const parseArguments = (args) => {
   });
 
   let commitRef = typeof values.commit === 'string' ? values.commit : null;
+  let pullRequestUrl = null;
   let requestedPath = null;
 
   for (const arg of positionals) {
-    if (!commitRef && isCommitHashArgument(arg)) {
+    if (!pullRequestUrl && isPullRequestUrlArgument(arg)) {
+      pullRequestUrl = arg;
+    } else if (!commitRef && isCommitHashArgument(arg)) {
       commitRef = arg;
     } else if (requestedPath == null) {
       requestedPath = arg;
@@ -35,6 +50,7 @@ export const parseArguments = (args) => {
 
   return {
     commitRef,
+    pullRequestUrl,
     requestedPath: resolve(requestedPath ?? process.cwd()),
     walkthrough: values.walkthrough === true,
   };

bin/codiff.js

@@ -10,7 +10,9 @@ import { parseArguments } from './arguments.js';
 const root = resolve(dirname(fileURLToPath(import.meta.url)), '..');
 
 const run = () => {
-  const { commitRef, requestedPath, walkthrough } = parseArguments(process.argv.slice(2));
+  const { commitRef, pullRequestUrl, requestedPath, walkthrough } = parseArguments(
+    process.argv.slice(2),
+  );
 
   if (!existsSync(resolve(root, 'dist/index.html')) && !process.env.ELECTRON_RENDERER_URL) {
     console.error('Codiff has not been built yet. Run `pnpm build` first.');
@@ -21,6 +23,7 @@ const run = () => {
     env: {
       ...process.env,
       CODIFF_COMMIT_REF: commitRef ?? '',
+      CODIFF_PULL_REQUEST_URL: pullRequestUrl ?? '',
       CODIFF_REPOSITORY_PATH: requestedPath,
       CODIFF_WALKTHROUGH: walkthrough ? '1' : '',
     },