General refactoring

src/api/get-changed-files.ts

@@ -0,0 +1,24 @@
+import * as core from '@actions/core';
+import * as github from '@actions/github';
+import {ClientType} from './types';
+
+export const getChangedFiles = async (
+  client: ClientType,
+  prNumber: number
+): Promise<string[]> => {
+  const listFilesOptions = client.rest.pulls.listFiles.endpoint.merge({
+    owner: github.context.repo.owner,
+    repo: github.context.repo.repo,
+    pull_number: prNumber
+  });
+
+  const listFilesResponse = await client.paginate(listFilesOptions);
+  const changedFiles = listFilesResponse.map((f: any) => f.filename);
+
+  core.debug('found changed files:');
+  for (const file of changedFiles) {
+    core.debug('  ' + file);
+  }
+
+  return changedFiles;
+};

src/api/get-changed-pull-requests.ts

@@ -0,0 +1,38 @@
+import * as core from '@actions/core';
+import * as github from '@actions/github';
+import {getChangedFiles} from './get-changed-files';
+import {ClientType} from './types';
+
+export async function* getChangedPullRequests(
+  client: ClientType,
+  prNumbers: number[]
+) {
+  for (const prNumber of prNumbers) {
+    core.debug(`looking for pr #${prNumber}`);
+    let prData: any;
+    try {
+      const result = await client.rest.pulls.get({
+        owner: github.context.repo.owner,
+        repo: github.context.repo.repo,
+        pull_number: prNumber
+      });
+      prData = result.data;
+    } catch (error: any) {
+      core.warning(`Could not find pull request #${prNumber}, skipping`);
+      continue;
+    }
+
+    core.debug(`fetching changed files for pr #${prNumber}`);
+    const changedFiles: string[] = await getChangedFiles(client, prNumber);
+    if (!changedFiles.length) {
+      core.warning(`Pull request #${prNumber} has no changed files, skipping`);
+      continue;
+    }
+
+    yield {
+      data: prData,
+      number: prNumber,
+      changedFiles
+    };
+  }
+}

src/api/get-content.ts

@@ -0,0 +1,16 @@
+import * as github from '@actions/github';
+import {ClientType} from './types';
+
+export const getContent = async (
+  client: ClientType,
+  repoPath: string
+): Promise<string> => {
+  const response: any = await client.rest.repos.getContent({
+    owner: github.context.repo.owner,
+    repo: github.context.repo.repo,
+    path: repoPath,
+    ref: github.context.sha
+  });
+
+  return Buffer.from(response.data.content, response.data.encoding).toString();
+};

src/api/get-label-globs.ts

@@ -0,0 +1,70 @@
+import * as core from '@actions/core';
+import * as yaml from 'js-yaml';
+import fs from 'fs';
+import {ClientType} from './types';
+import {getContent} from './get-content';
+
+export interface MatchConfig {
+  all?: string[];
+  any?: string[];
+}
+
+export type StringOrMatchConfig = string | MatchConfig;
+
+export const getLabelGlobs = (
+  client: ClientType,
+  configurationPath: string
+): Promise<Map<string, StringOrMatchConfig[]>> =>
+  Promise.resolve()
+    .then(() => {
+      if (!fs.existsSync(configurationPath)) {
+        core.info(
+          `The configuration file (path: ${configurationPath}) isn't not found locally, fetching via the api`
+        );
+
+        return getContent(client, configurationPath);
+      }
+
+      core.info(
+        `The configuration file (path: ${configurationPath}) is found locally, reading from the file`
+      );
+
+      return fs.readFileSync(configurationPath, {
+        encoding: 'utf8'
+      });
+    })
+    .catch(error => {
+      if (error.name == 'HttpError' || error.name == 'NotFound') {
+        core.warning(
+          `The config file was not found at ${configurationPath}. Make sure it exists and that this action has the correct access rights.`
+        );
+      }
+      return Promise.reject(error);
+    })
+    .then(configuration => {
+      // loads (hopefully) a `{[label:string]: string | StringOrMatchConfig[]}`, but is `any`:
+      const configObject: any = yaml.load(configuration);
+
+      // transform `any` => `Map<string,StringOrMatchConfig[]>` or throw if yaml is malformed:
+      return getLabelGlobMapFromObject(configObject);
+    });
+
+function getLabelGlobMapFromObject(
+  configObject: any
+): Map<string, StringOrMatchConfig[]> {
+  const labelGlobs: Map<string, StringOrMatchConfig[]> = new Map();
+
+  for (const label in configObject) {
+    if (typeof configObject[label] === 'string') {
+      labelGlobs.set(label, [configObject[label]]);
+    } else if (configObject[label] instanceof Array) {
+      labelGlobs.set(label, configObject[label]);
+    } else {
+      throw Error(
+        `found unexpected type for label ${label} (should be string or array of globs)`
+      );
+    }
+  }
+
+  return labelGlobs;
+}

src/api/index.ts

@@ -0,0 +1,6 @@
+export * from './get-changed-files';
+export * from './get-changed-pull-requests';
+export * from './get-content';
+export * from './get-label-globs';
+export * from './set-labels';
+export * from './types';

src/api/set-labels.ts

@@ -0,0 +1,15 @@
+import * as github from '@actions/github';
+import {ClientType} from './types';
+
+export const setLabels = async (
+  client: ClientType,
+  prNumber: number,
+  labels: string[]
+) => {
+  await client.rest.issues.setLabels({
+    owner: github.context.repo.owner,
+    repo: github.context.repo.repo,
+    issue_number: prNumber,
+    labels: labels
+  });
+};

src/api/types.ts

@@ -0,0 +1,2 @@
+import * as github from '@actions/github';
+export type ClientType = ReturnType<typeof github.getOctokit>;