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* Helper functions for GitHub to Slack integration\n */\n\nimport type { KnownBlock } from \"npm:@slack/types\";\nimport { IncomingWebhook } from \"npm:@slack/webhook\";\nimport { Octokit } from \"npm:octokit\";\nimport { OpenAI } from \"npm:openai\";\n\n// Environment variables\nconst GITHUB_REPO_OWNER = Deno.env.get(\"GITHUB_REPO_OWNER\");\nconst GITHUB_REPO_NAME = Deno.env.get(\"GITHUB_REPO_NAME\");\nconst GITHUB_TOKEN = Deno.env.get(\"GITHUB_TOKEN\");\nconst SLACK_WEBHOOK_URL = Deno.env.get(\"SLACK_WEBHOOK_URL\");\n\n// Changelog configuration\nconst CHANGELOG_FILE_PATH = \"apps/docs/changelog.mdx\";\nconst MAIN_BRANCH = \"main\";\n\n// Slack webhook instance\nlet webhookInstance: IncomingWebhook | null = null;\n\nfunction getSlackWebhookInstance(): IncomingWebhook {\n if (!webhookInstance) {\n if (!SLACK_WEBHOOK_URL) throw new Error(\"SLACK_WEBHOOK_URL is not set\");\n webhookInstance = new IncomingWebhook(SLACK_WEBHOOK_URL);\n }\n return webhookInstance;\n}\n\n/**\n * Generate a complete changelog from all commits using GPT-5\n */\nexport async function generateChangelogFromCommits(\n commits: any[],\n): Promise {\n const openai = new OpenAI();\n\n // Extract commit messages\n const commitMessages = commits.map((commit, index) =>\n `${index + 1}. ${commit.commit.message}`\n ).join(\"\\n\");\n\n console.log(\"commitMessages\", commitMessages);\n\n const prompt =\n `You are writing product updates for our applicant tracking system that is focused on recruiting software customers (executive search firms, recrutiing agencies).\n\nTransform these technical commits into a clean, organized changelog that we will share weekly. Focus on user value, not technical details.\n\nRules:\n- Use business-friendly language but not too formal. Keep it concise.\n- Group similar changes together. \n- Include key feature that affects what users can do. Focus on what the user can do. \n- For technical debt: say \"improved performance\" or \"enhanced stability\"\n- You must not mention any of the merge commits, version bumps, pure testing, pure documentation, things that user might not understand (e.g. nylas, inngest, vercel that is all infra related)\n- Don't need to say things like \"safer rich-text rendering to prevent editor issues, optimized activity timelines, and updated security headers (Permissions-Policy)\" as user will not are about security headers\n- Use these exact categories with emojis:\n 🚀 New features:\n ⚡️ Improvements\n 🐛 Bug fixes:\n\nCommit messages:\n${commitMessages}\n\nExample output format:\n🚀 New features / improvements:\n- AI personalization in emails - supported in bulk email, and regular email\n- Ability to add relationships between people and companies easily \n\n⚡️ Improvements\n- Visual improvements to the candidate detail page\n\n🐛 Bug fixes:\n- Fixed issue that prevented users from switching to dark mode\n- Fixed the bug that caused duplicate companies\n- Improved codebase to make the company list load faster\n\nGenerate a clean changelog. `;\n\n try {\n console.log(\"prompt\", prompt);\n const completion = await openai.chat.completions.create({\n messages: [{ role: \"user\", content: prompt }],\n model: \"gpt-5\",\n max_completion_tokens: 12000,\n temperature: 1,\n });\n\n //console.log(JSON.stringify(completion));\n\n const changelog = completion.choices[0]?.message?.content?.trim();\n\n if (!changelog) {\n console.log(\"no change log returned\");\n return \"No significant user-facing updates in this period.\";\n }\n\n return changelog;\n } catch (error) {\n console.error(\"Failed to generate changelog:\", error);\n return \"Error generating changelog. Please check the logs.\";\n }\n}\n\n/**\n * Build Slack payload from generated changelog\n */\nexport function buildSlackPayload(\n changelog: string,\n repoName?: string,\n since?: string,\n until?: string,\n): { blocks: KnownBlock[] } {\n const blocks: KnownBlock[] = [\n {\n type: \"header\",\n text: { type: \"plain_text\", text: \"📝 Product Updates\", emoji: true },\n },\n ];\n\n // Add date range context if provided\n if (repoName && since && until) {\n blocks.push({\n type: \"context\",\n elements: [\n {\n type: \"mrkdwn\",\n text: `Product updates from ${\n new Date(since).toLocaleDateString()\n } - ${new Date(until).toLocaleDateString()}`,\n },\n ],\n });\n }\n\n // Add the changelog content\n blocks.push({\n type: \"section\",\n text: { type: \"mrkdwn\", text: changelog },\n });\n\n return { blocks };\n}\n\n/**\n * Send message to Slack\n */\nexport async function sendSlackMessage(payload: { blocks: KnownBlock[] }) {\n const cleanPayload = { blocks: payload.blocks };\n await getSlackWebhookInstance().send(cleanPayload);\n}\n\n/**\n * Fetch all commits from GitHub for the given date range with pagination\n */\nexport async function fetchCommits(\n since: string,\n until: string,\n): Promise {\n if (!GITHUB_REPO_OWNER || !GITHUB_REPO_NAME || !GITHUB_TOKEN) {\n throw new Error(\n \"Missing one or more environment variables: GITHUB_REPO_OWNER, GITHUB_REPO_NAME, GITHUB_TOKEN\",\n );\n }\n\n const octokit = new Octokit({ auth: GITHUB_TOKEN });\n\n console.log(\n `Fetching all commits from ${GITHUB_REPO_OWNER}/${GITHUB_REPO_NAME} between ${since} and ${until}`,\n );\n\n try {\n const allCommits: any[] = [];\n let page = 1;\n const perPage = 100; // Maximum allowed per page\n\n while (true) {\n const response = await octokit.rest.repos.listCommits({\n owner: GITHUB_REPO_OWNER,\n repo: GITHUB_REPO_NAME,\n since: since,\n until: until,\n per_page: perPage,\n page: page,\n });\n\n console.log(\n `GitHub API page ${page} response status: ${response.status}, commits: ${response.data.length}`,\n );\n\n // Add commits from this page to our collection\n allCommits.push(...response.data);\n\n // If we got less than the per_page amount, we've reached the end\n if (response.data.length < perPage) {\n break;\n }\n\n page++;\n\n // Safety check to prevent infinite loops (GitHub has rate limits anyway)\n if (page > 100) {\n console.warn(\"Reached maximum page limit (100), stopping pagination\");\n break;\n }\n }\n\n console.log(\n `Total commits fetched across ${page} pages: ${allCommits.length}`,\n );\n return allCommits;\n } catch (error) {\n console.error(\"GitHub API Error:\", error);\n throw error;\n }\n}\n\n/**\n * Format changelog content into MDX Update format with proper date range\n */\nfunction formatChangelogToMDX(\n changelog: string,\n since: string,\n until: string,\n): string {\n const startDate = new Date(since);\n const endDate = new Date(until);\n\n // Format date range as \"September 15-22, 2025\"\n const startMonth = startDate.toLocaleDateString(\"en-US\", { month: \"long\" });\n const endMonth = endDate.toLocaleDateString(\"en-US\", { month: \"long\" });\n const year = endDate.getFullYear();\n\n let dateLabel: string;\n if (startMonth === endMonth) {\n dateLabel =\n `${startMonth} ${startDate.getDate()}-${endDate.getDate()}, ${year}`;\n } else {\n dateLabel =\n `${startMonth} ${startDate.getDate()} - ${endMonth} ${endDate.getDate()}, ${year}`;\n }\n\n return `\n${changelog}\n`;\n}\n\n/**\n * Create Octokit instance for GitHub operations\n */\nfunction createOctokit(): Octokit {\n if (!GITHUB_TOKEN) {\n throw new Error(\"GITHUB_TOKEN is not set\");\n }\n return new Octokit({ auth: GITHUB_TOKEN });\n}\n\n/**\n * Get the current changelog content from GitHub\n */\nasync function getCurrentChangelogContent(): Promise<\n { content: string; sha: string }\n> {\n const octokit = createOctokit();\n\n try {\n const response = await octokit.rest.repos.getContent({\n owner: GITHUB_REPO_OWNER!,\n repo: GITHUB_REPO_NAME!,\n path: CHANGELOG_FILE_PATH,\n ref: MAIN_BRANCH,\n });\n\n if (!(\"content\" in response.data)) {\n throw new Error(\"Changelog file not found or is a directory\");\n }\n\n // GitHub API returns base64 encoded content, decode it properly for UTF-8\n const base64Content = response.data.content.replace(/\\n/g, \"\");\n const binaryString = atob(base64Content);\n const bytes = new Uint8Array(binaryString.length);\n for (let i = 0; i < binaryString.length; i++) {\n bytes[i] = binaryString.charCodeAt(i);\n }\n const content = new TextDecoder(\"utf-8\").decode(bytes);\n return {\n content,\n sha: response.data.sha,\n };\n } catch (error) {\n console.error(\"Failed to get current changelog content:\", error);\n throw error;\n }\n}\n\n/**\n * Create a new branch from main, with fallback for existing branches\n */\nasync function createBranch(branchName: string): Promise {\n const octokit = createOctokit();\n\n // Get the main branch's latest commit SHA\n const mainBranch = await octokit.rest.repos.getBranch({\n owner: GITHUB_REPO_OWNER!,\n repo: GITHUB_REPO_NAME!,\n branch: MAIN_BRANCH,\n });\n\n let actualBranchName = branchName;\n let attempt = 0;\n\n // Try to create branch, with fallback if it already exists\n while (attempt < 5) {\n try {\n await octokit.rest.git.createRef({\n owner: GITHUB_REPO_OWNER!,\n repo: GITHUB_REPO_NAME!,\n ref: `refs/heads/${actualBranchName}`,\n sha: mainBranch.data.commit.sha,\n });\n\n console.log(`Created branch: ${actualBranchName}`);\n return actualBranchName;\n } catch (error: any) {\n if (error.status === 422 && error.message?.includes(\"already exists\")) {\n attempt++;\n // Add a suffix to make it unique\n actualBranchName = `${branchName}-${attempt}`;\n console.log(`Branch exists, trying: ${actualBranchName}`);\n } else {\n throw error;\n }\n }\n }\n\n throw new Error(`Failed to create unique branch after ${attempt} attempts`);\n}\n\n/**\n * Update the changelog file with new content\n */\nasync function updateChangelogFile(\n branchName: string,\n newContent: string,\n fileSha: string,\n commitMessage: string,\n): Promise {\n const octokit = createOctokit();\n\n await octokit.rest.repos.createOrUpdateFileContents({\n owner: GITHUB_REPO_OWNER!,\n repo: GITHUB_REPO_NAME!,\n path: CHANGELOG_FILE_PATH,\n message: commitMessage,\n content: btoa(String.fromCharCode(...new TextEncoder().encode(newContent))), // Properly encode UTF-8 content for GitHub API\n sha: fileSha,\n branch: branchName,\n });\n\n console.log(`Updated ${CHANGELOG_FILE_PATH} on branch ${branchName}`);\n}\n\n/**\n * Create a pull request\n */\nasync function createPullRequest(\n branchName: string,\n title: string,\n body: string,\n): Promise {\n const octokit = createOctokit();\n\n const pr = await octokit.rest.pulls.create({\n owner: GITHUB_REPO_OWNER!,\n repo: GITHUB_REPO_NAME!,\n title,\n body,\n head: branchName,\n base: MAIN_BRANCH,\n });\n\n console.log(`Created pull request: ${pr.data.html_url}`);\n}\n\n/**\n * Main function to create changelog PR after generating changelog\n */\nasync function createChangelogPR(\n changelog: string,\n since: string,\n until: string,\n): Promise {\n if (!GITHUB_REPO_OWNER || !GITHUB_REPO_NAME || !GITHUB_TOKEN) {\n throw new Error(\"Missing GitHub configuration environment variables\");\n }\n\n // Generate unique branch name with timestamp to avoid conflicts\n const timestamp = new Date().toISOString().replace(/[:.]/g, \"-\").slice(0, -5); // Remove milliseconds and replace colons\n const branchName = `changelog-update-${timestamp}`;\n\n try {\n // Get current changelog content\n const { content: currentContent, sha: fileSha } =\n await getCurrentChangelogContent();\n\n // Format the new changelog entry\n const newUpdateEntry = formatChangelogToMDX(changelog, since, until);\n\n // Find the position after the first closing tag (after the header section)\n // Look for the pattern: ---\\n\\n and insert after it\n const headerEndPattern = /---\\n([\\s\\S]*?\\n)(?= {\n if (!SLACK_WEBHOOK_URL) {\n throw new Error(\"Missing SLACK_WEBHOOK_URL environment variable\");\n }\n\n const commits = await fetchCommits(since, until);\n\n if (commits.length === 0) {\n console.log(\n `No new commits found between ${since} and ${until}. Preparing to exit.`,\n );\n return;\n }\n console.log(`Fetched ${commits.length} new commits.`);\n\n const changelog = await generateChangelogFromCommits(commits);\n const slackPayload = buildSlackPayload(\n changelog,\n GITHUB_REPO_NAME!,\n since,\n until,\n );\n\n await sendSlackMessage(slackPayload);\n console.log(\"Successfully sent message to Slack.\");\n\n // Create changelog PR after posting to Slack\n try {\n await createChangelogPR(changelog, since, until);\n console.log(\"Successfully created changelog PR.\");\n } catch (error) {\n console.error(\"Failed to create changelog PR:\", error);\n // Don't throw the error - we still want the Slack message to be considered successful\n // The changelog PR is a nice-to-have but not critical to the core functionality\n }\n}\n\n/**\n * Main function - Process commits, post to Slack, and create changelog PR\n * This is the primary entry point for the changelog workflow\n */\nexport async function processCommitsAndCreateChangelog(\n since: string,\n until: string,\n): Promise<{\n slackPosted: boolean;\n changelogPRCreated: boolean;\n changelog: string;\n}> {\n const result = {\n slackPosted: false,\n changelogPRCreated: false,\n changelog: \"\",\n };\n\n try {\n const commits = await fetchCommits(since, until);\n\n if (commits.length === 0) {\n console.log(\n `No new commits found between ${since} and ${until}. No actions taken.`,\n );\n return result;\n }\n\n console.log(`Processing ${commits.length} commits...`);\n const changelog = await generateChangelogFromCommits(commits);\n result.changelog = changelog;\n\n // Post to Slack\n if (SLACK_WEBHOOK_URL) {\n try {\n const slackPayload = buildSlackPayload(\n changelog,\n GITHUB_REPO_NAME!,\n since,\n until,\n );\n await sendSlackMessage(slackPayload);\n result.slackPosted = true;\n console.log(\"✅ Successfully posted to Slack.\");\n } catch (error) {\n console.error(\"❌ Failed to post to Slack:\", error);\n }\n }\n\n // Create changelog PR\n if (GITHUB_REPO_OWNER && GITHUB_REPO_NAME && GITHUB_TOKEN) {\n try {\n await createChangelogPR(changelog, since, until);\n result.changelogPRCreated = true;\n console.log(\"✅ Successfully created changelog PR.\");\n } catch (error) {\n console.error(\"❌ Failed to create changelog PR:\", error);\n }\n }\n\n return result;\n } catch (error) {\n console.error(\"❌ Failed to process commits:\", error);\n throw error;\n }\n}","deleted","label",[99],"permalink","https://www.val.town/x/sanketchauhan/Change-Logs-Generator/code/process-commits.tsx","extension","actionData","errors"]