1 files changed, 64 insertions, 0 deletions
diff --git a/packages/monorepo-scripts/src/utils/utils.ts b/packages/monorepo-scripts/src/utils/utils.ts
new file mode 100644
index 000000000..8f2a0bbaa
--- /dev/null
+++ b/packages/monorepo-scripts/src/utils/utils.ts
@@ -0,0 +1,64 @@
+import * as fs from 'fs';
+import lernaGetPackages = require('lerna-get-packages');
+import * as _ from 'lodash';
+import { exec as execAsync, spawn } from 'promisify-child-process';
+
+import { constants } from '../constants';
+import { UpdatedPackage } from '../types';
+
+export const utils = {
+    log(...args: any[]): void {
+        console.log(...args); // tslint:disable-line:no-console
+    },
+    getNextPatchVersion(currentVersion: string): string {
+        const versionSegments = currentVersion.split('.');
+        const patch = _.parseInt(_.last(versionSegments) as string);
+        const newPatch = patch + 1;
+        const newPatchVersion = `${versionSegments[0]}.${versionSegments[1]}.${newPatch}`;
+        return newPatchVersion;
+    },
+    async prettifyAsync(filePath: string, cwd: string): Promise<void> {
+        await execAsync(`prettier --write ${filePath} --config .prettierrc`, {
+            cwd,
+        });
+    },
+    async getUpdatedLernaPackagesAsync(shouldIncludePrivate: boolean): Promise<LernaPackage[]> {
+        const updatedPublicPackages = await this.getLernaUpdatedPackagesAsync(shouldIncludePrivate);
+        const updatedPackageNames = _.map(updatedPublicPackages, pkg => pkg.name);
+
+        const allLernaPackages = lernaGetPackages(constants.monorepoRootPath);
+        const updatedPublicLernaPackages = _.filter(allLernaPackages, pkg => {
+            return _.includes(updatedPackageNames, pkg.package.name);
+        });
+        return updatedPublicLernaPackages;
+    },
+    async getLernaUpdatedPackagesAsync(shouldIncludePrivate: boolean): Promise<UpdatedPackage[]> {
+        const result = await execAsync(`${constants.lernaExecutable} updated --json`, {
+            cwd: constants.monorepoRootPath,
+        });
+        const updatedPackages = JSON.parse(result.stdout);
+        if (!shouldIncludePrivate) {
+            const updatedPublicPackages = _.filter(updatedPackages, updatedPackage => !updatedPackage.private);
+            return updatedPublicPackages;
+        }
+        return updatedPackages;
+    },
+    getChangelogJSONIfExists(changelogPath: string): string | undefined {
+        try {
+            const changelogJSON = fs.readFileSync(changelogPath, 'utf-8');
+            return changelogJSON;
+        } catch (err) {
+            return undefined;
+        }
+    },
+    getChangelogJSONOrCreateIfMissing(changelogPath: string): string {
+        const changelogIfExists = this.getChangelogJSONIfExists(changelogPath);
+        if (_.isUndefined(changelogIfExists)) {
+            // If none exists, create new, empty one.
+            const emptyChangelogJSON = JSON.stringify([]);
+            fs.writeFileSync(changelogPath, emptyChangelogJSON);
+            return emptyChangelogJSON;
+        }
+        return changelogIfExists;
+    },
+};