Add initial edition of cherry-pick script (#31705)

Author: weswigham

scripts/open-cherry-pick-pr.ts

@@ -0,0 +1,94 @@
+/// <reference lib="esnext.asynciterable" />
+// Must reference esnext.asynciterable lib, since octokit uses AsyncIterable internally
+/// <reference types="node" />
+
+import Octokit = require("@octokit/rest");
+import {runSequence} from "./run-sequence";
+import fs = require("fs");
+import path = require("path");
+
+const userName = process.env.GH_USERNAME;
+const reviewers = process.env.REQUESTING_USER ? [process.env.REQUESTING_USER] : ["weswigham", "RyanCavanaugh"];
+const branchName = `pick/${process.env.SOURCE_ISSUE}/${process.env.TARGET_BRANCH}`;
+const remoteUrl = `https://${process.argv[2]}@github.com/${userName}/TypeScript.git`;
+
+async function main() {
+    const currentSha = runSequence([
+        ["git", ["rev-parse", "HEAD"]]
+    ]);
+    const currentAuthor = runSequence([
+        ["git", ["log", "-1", `--pretty="%aN <%aE>"`]]
+    ])
+    let logText = runSequence([
+        ["git", ["log", `master..${currentSha}`, `--pretty="%h %s%n%b"`]]
+    ]);
+    logText = `Cherry-pick PR #${process.env.SOURCE_ISSUE} into ${process.env.TARGET_BRANCH}
+
+Component commits:
+${logText}`
+    const logpath = path.join(__dirname, "../", "logmessage.txt");
+    runSequence([
+        ["git", ["checkout", "-b", "temp-branch"]],
+        ["git", ["reset", "master", "--soft"]]
+    ]);
+    fs.writeFileSync(logpath, logText);
+    runSequence([
+        ["git", ["commit", "-F", logpath, `--author="${currentAuthor}"`]]
+    ]);
+    fs.unlinkSync(logpath);
+    const squashSha = runSequence([
+        ["git", ["rev-parse", "HEAD"]]
+    ]);
+    runSequence([
+        ["git", ["checkout", process.env.TARGET_BRANCH]], // checkout the target branch
+        ["git", ["checkout", "-b", branchName]], // create a new branch
+        ["git", ["cherry-pick", squashSha]], // 
+        ["git", ["remote", "add", "fork", remoteUrl]], // Add the remote fork
+        ["git", ["push", "--set-upstream", "fork", branchName, "-f"]] // push the branch
+    ]);
+
+    const gh = new Octokit();
+    gh.authenticate({
+        type: "token",
+        token: process.argv[2]
+    });
+    const r = await gh.pulls.create({
+        owner: "Microsoft",
+        repo: "TypeScript",
+        maintainer_can_modify: true,
+        title: `🤖 Cherry-pick PR #${process.env.SOURCE_ISSUE} into ${process.env.TARGET_BRANCH}`,
+        head: `${userName}:${branchName}`,
+        base: process.env.TARGET_BRANCH,
+        body:
+    `This cherry-pick was triggerd by a request on https://github.com/Microsoft/TypeScript/pull/${process.env.SOURCE_ISSUE}
+    Please review the diff and merge if no changes are unexpected.
+    You can view the cherry-pick log [here](https://typescript.visualstudio.com/TypeScript/_build/index?buildId=${process.env.BUILD_BUILDID}&_a=summary).
+
+    cc ${reviewers.map(r => "@" + r).join(" ")}`,
+    });
+    const num = r.data.number;
+    console.log(`Pull request ${num} created.`);
+
+    await gh.issues.createComment({
+        number: +process.env.SOURCE_ISSUE,
+        owner: "Microsoft",
+        repo: "TypeScript",
+        body: `Hey @${process.env.REQUESTING_USER}, I've opened #${num} for you.`
+    });
+}
+
+main().catch(async e => {
+    console.error(e);
+    process.exitCode = 1;
+    const gh = new Octokit();
+    gh.authenticate({
+        type: "token",
+        token: process.argv[2]
+    });
+    await gh.issues.createComment({
+        number: +process.env.SOURCE_ISSUE,
+        owner: "Microsoft",
+        repo: "TypeScript",
+        body: `Hey @${process.env.REQUESTING_USER}, I couldn't open a PR with the cherry-pick. ([You can check the log here](https://typescript.visualstudio.com/TypeScript/_build/index?buildId=${process.env.BUILD_BUILDID}&_a=summary)). You may need to squash and pick this PR into ${process.env.TARGET_BRANCH} manually.`
+    });
+});