ci/supportedBranches.js: move to ci/github-script

This way it will be covered by our package.json when we configure ES Modules
in the next commit.

ci/github-script/bot.js

@@ -4,7 +4,7 @@ module.exports = async ({ github, context, core, dry }) => {
   const { DefaultArtifactClient } = await import('@actions/artifact')
   const { readFile, writeFile } = require('node:fs/promises')
   const withRateLimit = require('./withRateLimit.js')
-  const { classify } = require('../supportedBranches.js')
+  const { classify } = require('./supportedBranches.js')
   const { handleMerge } = require('./merge.js')
   const { handleReviewers } = require('./reviewers.js')
 

ci/github-script/check-target-branch-policy.ts

@@ -1,4 +1,4 @@
-const { classify, split } = require('../supportedBranches.js')
+const { classify, split } = require('./supportedBranches.js')
 
 type TargetBranchPolicyFacts = {
   base: string

ci/github-script/check-target-branch.ts

@@ -6,7 +6,7 @@ import type { GitHub } from '@actions/github/lib/utils'
 // They do seem quite similar, but this needs to run after eval,
 // and prepare.js obviously doesn't.
 
-const { split } = require('../supportedBranches.js')
+const { split } = require('./supportedBranches.js')
 const { readFile } = require('node:fs/promises')
 const { postReview, dismissReviews } = require('./reviews.js')
 const {

ci/github-script/commits.js

@@ -1,7 +1,7 @@
 // @ts-nocheck
 module.exports = async ({ github, context, core, dry, cherryPicks }) => {
   const { execFileSync } = require('node:child_process')
-  const { classify } = require('../supportedBranches.js')
+  const { classify } = require('./supportedBranches.js')
   const withRateLimit = require('./withRateLimit.js')
   const { dismissReviews, postReview } = require('./reviews.js')
   const reviewKey = 'check-commits'

ci/github-script/lint-commits.js

@@ -1,4 +1,4 @@
-const { classify } = require('../supportedBranches.js')
+const { classify } = require('./supportedBranches.js')
 const { getCommitDetailsForPR } = require('./get-pr-commit-details.js')
 
 /** @typedef {import('./get-pr-commit-details.js').Commit} Commit */

ci/github-script/manual-file-edits.js

@@ -1,4 +1,4 @@
-const { classify } = require('../supportedBranches.js')
+const { classify } = require('./supportedBranches.js')
 const { getCommitDetailsForPR } = require('./get-pr-commit-details')
 
 /**

ci/github-script/merge.js

@@ -1,5 +1,5 @@
 // @ts-nocheck
-const { classify } = require('../supportedBranches.js')
+const { classify } = require('./supportedBranches.js')
 
 function runChecklist({
   committers,

ci/github-script/prepare.js

@@ -1,5 +1,5 @@
 // @ts-nocheck
-const { classify } = require('../supportedBranches.js')
+const { classify } = require('./supportedBranches.js')
 const { postReview, dismissReviews } = require('./reviews.js')
 const reviewKey = 'prepare'
 const supportedSystems = require('./supportedSystems.js')
@@ -65,7 +65,7 @@ module.exports = async ({ github, context, core, dry }) => {
       // commits between that base and head is the real base. We can query for this via GitHub's
       // REST API. There can be multiple candidates for the real base with the same number of
       // commits. In this case we pick the "best" candidate by a fixed ordering of branches,
-      // as defined in ci/supportedBranches.js.
+      // as defined in ./supportedBranches.js.
       //
       // These requests take a while, when comparing against the wrong release - they need
       // to look at way more than 10k commits in that case. Thus, we try to minimize the

ci/github-script/supportedBranches.js

@@ -0,0 +1,83 @@
+#!/usr/bin/env nix-shell
+/*
+#!nix-shell -i node -p nodejs
+*/
+// @ts-nocheck
+
+const typeConfig = {
+  master: ['development', 'primary'],
+  release: ['development', 'primary'],
+  staging: ['development', 'secondary'],
+  'staging-next': ['development', 'secondary'],
+  'staging-nixos': ['development', 'secondary'],
+  'haskell-updates': ['development', 'secondary'],
+  nixos: ['channel'],
+  nixpkgs: ['channel'],
+}
+
+// "order" ranks the development branches by how likely they are the intended base branch
+// when they are an otherwise equally good fit according to ci/github-script/prepare.js.
+const orderConfig = {
+  master: 0,
+  release: 1,
+  staging: 2,
+  'staging-nixos': 2,
+  'haskell-updates': 3,
+  'staging-next': 4,
+}
+
+function split(branch) {
+  return {
+    ...branch.match(
+      /(?<prefix>.+?)(-(?<version>\d{2}\.\d{2}|unstable)(?:-(?<suffix>.*))?)?$/,
+    ).groups,
+  }
+}
+
+function classify(branch) {
+  const { prefix, version } = split(branch)
+  return {
+    branch,
+    order: orderConfig[prefix] ?? Infinity,
+    stable: (version ?? 'unstable') !== 'unstable',
+    type: typeConfig[prefix] ?? ['wip'],
+    version: version ?? 'unstable',
+  }
+}
+
+module.exports = { classify, split }
+
+// If called directly via CLI, runs the following tests:
+if (!module.parent) {
+  console.log('split(branch)')
+  function testSplit(branch) {
+    console.log(branch, split(branch))
+  }
+  testSplit('master')
+  testSplit('release-25.05')
+  testSplit('staging')
+  testSplit('staging-next')
+  testSplit('staging-25.05')
+  testSplit('staging-next-25.05')
+  testSplit('nixpkgs-25.05-darwin')
+  testSplit('nixpkgs-unstable')
+  testSplit('haskell-updates')
+  testSplit('backport-123-to-release-25.05')
+
+  console.log('')
+
+  console.log('classify(branch)')
+  function testClassify(branch) {
+    console.log(branch, classify(branch))
+  }
+  testClassify('master')
+  testClassify('release-25.05')
+  testClassify('staging')
+  testClassify('staging-next')
+  testClassify('staging-25.05')
+  testClassify('staging-next-25.05')
+  testClassify('nixpkgs-25.05-darwin')
+  testClassify('nixpkgs-unstable')
+  testClassify('haskell-updates')
+  testClassify('backport-123-to-release-25.05')
+}