1 files changed, 119 insertions, 0 deletions
diff --git a/packages/monorepo-scripts/src/utils/github_release_utils.ts b/packages/monorepo-scripts/src/utils/github_release_utils.ts
new file mode 100644
index 000000000..0f3485de0
--- /dev/null
+++ b/packages/monorepo-scripts/src/utils/github_release_utils.ts
@@ -0,0 +1,119 @@
+import * as promisify from 'es6-promisify';
+import { readFileSync } from 'fs';
+import * as _ from 'lodash';
+import * as path from 'path';
+import { exec as execAsync } from 'promisify-child-process';
+import * as publishRelease from 'publish-release';
+
+import { constants } from '../constants';
+import { Package } from '../types';
+
+import { utils } from './utils';
+
+const publishReleaseAsync = promisify(publishRelease);
+// tslint:disable-next-line:completed-docs
+export async function publishReleaseNotesAsync(updatedPublishPackages: Package[], isDryRun: boolean): Promise<void> {
+    // Git push a tag representing this publish (publish-{commit-hash}) (truncate hash)
+    const result = await execAsync('git log -n 1 --pretty=format:"%H"', { cwd: constants.monorepoRootPath });
+    const latestGitCommit = result.stdout;
+    const prefixLength = 7;
+    const shortenedGitCommit = latestGitCommit.slice(0, prefixLength);
+    const tagName = `monorepo@${shortenedGitCommit}`;
+
+    if (!isDryRun) {
+        try {
+            await execAsync(`git tag ${tagName}`);
+        } catch (err) {
+            if (_.includes(err.message, 'already exists')) {
+                // Noop tag creation since already exists
+            } else {
+                throw err;
+            }
+        }
+        const { stdout } = await execAsync(`git ls-remote --tags origin refs/tags/${tagName}`);
+        if (_.isEmpty(stdout)) {
+            await execAsync(`git push origin ${tagName}`);
+        }
+    }
+
+    const releaseName = `0x monorepo - ${shortenedGitCommit}`;
+
+    let assets: string[] = [];
+    let aggregateNotes = '';
+    _.each(updatedPublishPackages, pkg => {
+        const notes = getReleaseNotesForPackage(pkg.packageJson.name, pkg.packageJson.version);
+        if (_.isEmpty(notes)) {
+            return; // don't include it
+        }
+        aggregateNotes += `### ${pkg.packageJson.name}@${pkg.packageJson.version}\n${notes}\n\n`;
+
+        const packageAssets = _.get(pkg.packageJson, 'config.postpublish.assets');
+        if (!_.isUndefined(packageAssets)) {
+            assets = [...assets, ...packageAssets];
+        }
+    });
+    const finalAssets = adjustAssetPaths(assets);
+
+    const publishReleaseConfigs = {
+        token: constants.githubPersonalAccessToken,
+        owner: '0xProject',
+        tag: tagName,
+        repo: '0x-monorepo',
+        name: releaseName,
+        notes: aggregateNotes,
+        draft: false,
+        prerelease: false,
+        reuseRelease: true,
+        reuseDraftOnly: false,
+        // TODO: Currently publish-release doesn't let you specify the labels for each asset uploaded
+        // Ideally we would like to name the assets after the package they are from
+        // Source: https://github.com/remixz/publish-release/issues/39
+        assets: finalAssets,
+    };
+
+    if (isDryRun) {
+        utils.log(`Dry run: stopping short of publishing release notes to github`);
+        utils.log(`Would publish with configs:\n${JSON.stringify(publishReleaseConfigs, null, '\t')}`);
+        return;
+    }
+
+    utils.log('Publishing release notes ', releaseName, '...');
+    await publishReleaseAsync(publishReleaseConfigs);
+}
+
+// Asset paths should described from the monorepo root. This method prefixes
+// the supplied path with the absolute path to the monorepo root.
+function adjustAssetPaths(assets: string[]): string[] {
+    const finalAssets: string[] = [];
+    _.each(assets, (asset: string) => {
+        const finalAsset = `${constants.monorepoRootPath}/${asset}`;
+        finalAssets.push(finalAsset);
+    });
+    return finalAssets;
+}
+
+function getReleaseNotesForPackage(packageName: string, version: string): string {
+    const packageNameWithoutNamespace = packageName.replace('@0xproject/', '');
+    const changelogJSONPath = path.join(
+        constants.monorepoRootPath,
+        'packages',
+        packageNameWithoutNamespace,
+        'CHANGELOG.json',
+    );
+    const changelogJSON = readFileSync(changelogJSONPath, 'utf-8');
+    const changelogs = JSON.parse(changelogJSON);
+    const latestLog = changelogs[0];
+    // If only has a `Dependencies updated` changelog, we don't include it in release notes
+    if (latestLog.changes.length === 1 && latestLog.changes[0].note === constants.dependenciesUpdatedMessage) {
+        return '';
+    }
+    let notes = '';
+    _.each(latestLog.changes, change => {
+        notes += `* ${change.note}`;
+        if (change.pr) {
+            notes += ` (#${change.pr})`;
+        }
+        notes += `\n`;
+    });
+    return notes;
+}