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