tweak: DevEx to run changelog independently

script/changelog.ts

@@ -0,0 +1,224 @@
+#!/usr/bin/env bun
+
+import { $ } from "bun"
+import { createOpencode } from "@opencode-ai/sdk"
+
+const TEAM = [
+  "actions-user",
+  "opencode",
+  "rekram1-node",
+  "thdxr",
+  "kommander",
+  "jayair",
+  "fwang",
+  "adamdotdevin",
+  "iamdavidhill",
+  "opencode-agent[bot]",
+]
+
+const MODEL = "gemini-3-flash"
+
+function getAreaFromPath(file: string): string {
+  if (file.startsWith("packages/")) {
+    const parts = file.replace("packages/", "").split("/")
+    if (parts[0] === "extensions" && parts[1]) return `extensions/${parts[1]}`
+    return parts[0] || "other"
+  }
+  if (file.startsWith("sdks/")) {
+    const name = file.replace("sdks/", "").split("/")[0] || "other"
+    return `extensions/${name}`
+  }
+  const rootDir = file.split("/")[0]
+  if (rootDir && !rootDir.includes(".")) return rootDir
+  return "other"
+}
+
+function buildPrompt(previous: string, commits: string): string {
+  return `
+Analyze these commits and generate a changelog of all notable user facing changes, grouped by area.
+
+Each commit below includes:
+- [author: username] showing the GitHub username of the commit author
+- [areas: ...] showing which areas of the codebase were modified
+
+Commits between ${previous} and HEAD:
+${commits}
+
+Group the changes into these categories based on the [areas: ...] tags (omit any category with no changes):
+- **TUI**: Changes to "opencode" area (the terminal/CLI interface)
+- **Desktop**: Changes to "desktop" or "tauri" areas (the desktop application)
+- **SDK**: Changes to "sdk" or "plugin" areas (the SDK and plugin system)
+- **Extensions**: Changes to "extensions/zed", "extensions/vscode", or "github" areas (editor extensions and GitHub Action)
+- **Other**: Any user-facing changes that don't fit the above categories
+
+Excluded areas (omit these entirely unless they contain user-facing changes like refactors that may affect behavior):
+- "nix", "infra", "script" - CI/build infrastructure
+- "ui", "docs", "web", "console", "enterprise", "function", "util", "identity", "slack" - internal packages
+
+Rules:
+- Use the [areas: ...] tags to determine the correct category. If a commit touches multiple areas, put it in the most relevant user-facing category.
+- ONLY include commits that have user-facing impact. Omit purely internal changes (CI, build scripts, internal tooling).
+- However, DO include refactors that touch user-facing code - refactors can introduce bugs or change behavior.
+- Do NOT make general statements about "improvements", be very specific about what was changed.
+- For commits that are already well-written and descriptive, avoid rewording them. Simply capitalize the first letter, fix any misspellings, and ensure proper English grammar.
+- DO NOT read any other commits than the ones listed above (THIS IS IMPORTANT TO AVOID DUPLICATING THINGS IN OUR CHANGELOG).
+- If a commit was made and then reverted do not include it in the changelog. If the commits only include a revert but not the original commit, then include the revert in the changelog.
+- Omit categories that have no changes.
+- For community contributors: if the [author: username] is NOT in the team list, add (@username) at the end of the changelog entry. This is REQUIRED for all non-team contributors.
+- The team members are: ${TEAM.join(", ")}. Do NOT add @ mentions for team members.
+
+IMPORTANT: ONLY return the grouped changelog, do not include any other information. Do not include a preamble like "Based on my analysis..." or "Here is the changelog..."
+
+<example>
+## TUI
+- Added experimental support for the Ty language server (@OpeOginni)
+- Added /fork slash command for keyboard-friendly session forking (@ariane-emory)
+- Increased retry attempts for failed requests
+- Fixed model validation before executing slash commands (@devxoul)
+
+## Desktop
+- Added shell mode support
+- Fixed prompt history navigation and optimistic prompt duplication
+- Disabled pinch-to-zoom on Linux (@Brendonovich)
+
+## Extensions
+- Added OIDC_BASE_URL support for custom GitHub App installations (@elithrar)
+</example>
+`
+}
+
+function parseChangelog(raw: string): string[] {
+  const lines: string[] = []
+  for (const line of raw.split("\n")) {
+    if (line.startsWith("## ")) {
+      if (lines.length > 0) lines.push("")
+      lines.push(line)
+    } else if (line.startsWith("- ")) {
+      lines.push(line)
+    }
+  }
+  return lines
+}
+
+function formatContributors(contributors: Map<string, string[]>): string[] {
+  if (contributors.size === 0) return []
+  const lines: string[] = []
+  lines.push("")
+  lines.push(`**Thank you to ${contributors.size} community contributor${contributors.size > 1 ? "s" : ""}:**`)
+  for (const username of contributors.keys()) {
+    lines.push(`- @${username}`)
+  }
+  return lines
+}
+
+/**
+ * Generates a changelog for a release.
+ *
+ * Uses GitHub API for commit authors, git for file changes,
+ * and Gemini Flash via opencode SDK for changelog generation.
+ *
+ * @param previous - The previous version tag (e.g. "v1.0.167")
+ * @param current - The current ref (e.g. "HEAD" or "v1.0.168")
+ * @returns Formatted changelog string ready for GitHub release notes
+ */
+export async function generateChangelog(previous: string, current: string): Promise<string> {
+  // Fetch commit authors from GitHub API (hash -> login)
+  const compare =
+    await $`gh api "/repos/sst/opencode/compare/${previous}...${current}" --jq '.commits[] | {sha: .sha, login: .author.login, message: .commit.message}'`
+      .text()
+      .catch(() => "")
+
+  const authorByHash = new Map<string, string>()
+  const contributors = new Map<string, string[]>()
+
+  for (const line of compare.split("\n").filter(Boolean)) {
+    const { sha, login, message } = JSON.parse(line) as { sha: string; login: string | null; message: string }
+    if (login) authorByHash.set(sha, login)
+
+    const title = message.split("\n")[0] || ""
+    if (title.match(/^(ignore:|test:|chore:|ci:|release:)/i)) continue
+    if (login && !TEAM.includes(login)) {
+      if (!contributors.has(login)) contributors.set(login, [])
+      contributors.get(login)?.push(title)
+    }
+  }
+
+  function findAuthor(shortHash: string): string | undefined {
+    for (const [sha, login] of authorByHash) {
+      if (sha.startsWith(shortHash)) return login
+    }
+  }
+
+  // Batch-fetch files for all commits (hash -> areas)
+  const diffLog = await $`git log ${previous}..${current} --name-only --format="%h"`.text()
+  const areasByHash = new Map<string, Set<string>>()
+  let currentHash: string | null = null
+
+  for (const rawLine of diffLog.split("\n")) {
+    const line = rawLine.trim()
+    if (!line) continue
+    if (/^[0-9a-f]{7,}$/i.test(line) && !line.includes("/")) {
+      currentHash = line
+      if (!areasByHash.has(currentHash)) areasByHash.set(currentHash, new Set())
+      continue
+    }
+    if (currentHash) {
+      areasByHash.get(currentHash)!.add(getAreaFromPath(line))
+    }
+  }
+
+  // Build commit lines with author and areas
+  const log = await $`git log ${previous}..${current} --oneline --format="%h %s"`.text()
+  const commitLines = log.split("\n").filter((line) => line && !line.match(/^\w+ (ignore:|test:|chore:|ci:|release:)/i))
+
+  const commitsWithMeta = commitLines
+    .map((line) => {
+      const hash = line.split(" ")[0]
+      if (!hash) return null
+      const author = findAuthor(hash)
+      const authorStr = author ? ` [author: ${author}]` : ""
+      const areas = areasByHash.get(hash)
+      const areaStr = areas && areas.size > 0 ? ` [areas: ${[...areas].join(", ")}]` : " [areas: other]"
+      return `${line}${authorStr}${areaStr}`
+    })
+    .filter(Boolean) as string[]
+
+  const commits = commitsWithMeta.join("\n")
+
+  // Generate changelog via LLM
+  // different port to not conflict with dev running opencode
+  const opencode = await createOpencode({ port: 8192 })
+  let raw: string | undefined
+  try {
+    const session = await opencode.client.session.create()
+    raw = await opencode.client.session
+      .prompt({
+        path: { id: session.data!.id },
+        body: {
+          model: { providerID: "opencode", modelID: MODEL },
+          parts: [{ type: "text", text: buildPrompt(previous, commits) }],
+        },
+      })
+      .then((x) => x.data?.parts?.find((y) => y.type === "text")?.text)
+  } finally {
+    opencode.server.close()
+  }
+
+  const notes = parseChangelog(raw ?? "")
+  notes.push(...formatContributors(contributors))
+
+  return notes.join("\n")
+}
+
+// Standalone runner for local testing
+if (import.meta.main) {
+  const [previous, current] = process.argv.slice(2)
+  if (!previous || !current) {
+    console.error("Usage: bun script/changelog.ts <previous> <current>")
+    console.error("Example: bun script/changelog.ts v1.0.167 HEAD")
+    process.exit(1)
+  }
+  const changelog = await generateChangelog(previous, current)
+  console.log(changelog)
+  process.exit(0)
+}