perf: optimize getFileCommitDate, make it async

packages/docusaurus-plugin-content-blog/src/__tests__/index.test.ts

@@ -437,7 +437,7 @@ describe('blog plugin', () => {
     const noDateSource = path.posix.join('@site', PluginPath, 'no date.md');
     const noDateSourceFile = path.posix.join(siteDir, PluginPath, 'no date.md');
     // We know the file exists and we know we have git
-    const result = getFileCommitDate(noDateSourceFile, {age: 'oldest'});
+    const result = await getFileCommitDate(noDateSourceFile, {age: 'oldest'});
     const noDateSourceTime = result.date;
 
     expect({

packages/docusaurus-plugin-content-blog/src/blogUtils.ts

@@ -258,10 +258,11 @@ async function processBlogSourceFile(
     }
 
     try {
-      const result = getFileCommitDate(blogSourceAbsolute, {
+      const result = await getFileCommitDate(blogSourceAbsolute, {
         age: 'oldest',
         includeAuthor: false,
       });
+
       return result.date;
     } catch (err) {
       logger.warn(err);

packages/docusaurus-plugin-content-docs/src/lastUpdate.ts

@@ -25,10 +25,11 @@ export async function getFileLastUpdate(
   // Wrap in try/catch in case the shell commands fail
   // (e.g. project doesn't use Git, etc).
   try {
-    const result = getFileCommitDate(filePath, {
+    const result = await getFileCommitDate(filePath, {
       age: 'newest',
       includeAuthor: true,
     });
+
     return {timestamp: result.timestamp, author: result.author};
   } catch (err) {
     if (err instanceof GitNotFoundError) {

packages/docusaurus-utils/src/__tests__/gitUtils.test.ts

@@ -47,88 +47,92 @@ function initializeTempRepo() {
 describe('getFileCommitDate', () => {
   const repoDir = initializeTempRepo();
   it('returns earliest commit date', async () => {
-    expect(getFileCommitDate(path.join(repoDir, 'test.txt'), {})).toEqual({
+    await expect(
+      getFileCommitDate(path.join(repoDir, 'test.txt'), {}),
+    ).resolves.toEqual({
       date: new Date('2020-06-19'),
       timestamp: new Date('2020-06-19').getTime() / 1000,
     });
-    expect(getFileCommitDate(path.join(repoDir, 'dest.txt'), {})).toEqual({
+    await expect(
+      getFileCommitDate(path.join(repoDir, 'dest.txt'), {}),
+    ).resolves.toEqual({
       date: new Date('2020-09-13'),
       timestamp: new Date('2020-09-13').getTime() / 1000,
     });
   });
   it('returns latest commit date', async () => {
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'test.txt'), {age: 'newest'}),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-09-13'),
       timestamp: new Date('2020-09-13').getTime() / 1000,
     });
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'dest.txt'), {age: 'newest'}),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-11-13'),
       timestamp: new Date('2020-11-13').getTime() / 1000,
     });
   });
   it('returns latest commit date with author', async () => {
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'test.txt'), {
         age: 'oldest',
         includeAuthor: true,
       }),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-06-19'),
       timestamp: new Date('2020-06-19').getTime() / 1000,
       author: 'Caroline',
     });
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'dest.txt'), {
         age: 'oldest',
         includeAuthor: true,
       }),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-09-13'),
       timestamp: new Date('2020-09-13').getTime() / 1000,
       author: 'Caroline',
     });
   });
   it('returns earliest commit date with author', async () => {
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'test.txt'), {
         age: 'newest',
         includeAuthor: true,
       }),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-09-13'),
       timestamp: new Date('2020-09-13').getTime() / 1000,
       author: 'Caroline',
     });
-    expect(
+    await expect(
       getFileCommitDate(path.join(repoDir, 'dest.txt'), {
         age: 'newest',
         includeAuthor: true,
       }),
-    ).toEqual({
+    ).resolves.toEqual({
       date: new Date('2020-11-13'),
       timestamp: new Date('2020-11-13').getTime() / 1000,
       author: 'Josh-Cena',
     });
   });
   it('throws custom error when file is not tracked', async () => {
-    expect(() =>
+    await expect(() =>
       getFileCommitDate(path.join(repoDir, 'untracked.txt'), {
         age: 'newest',
         includeAuthor: true,
       }),
-    ).toThrow(FileNotTrackedError);
+    ).rejects.toThrow(FileNotTrackedError);
   });
   it('throws when file not found', async () => {
-    expect(() =>
+    await expect(() =>
       getFileCommitDate(path.join(repoDir, 'nonexistent.txt'), {
         age: 'newest',
         includeAuthor: true,
       }),
-    ).toThrow(
+    ).rejects.toThrow(
       /Failed to retrieve git history for ".*nonexistent.txt" because the file does not exist./,
     );
   });

packages/docusaurus-utils/src/gitUtils.ts

@@ -24,7 +24,7 @@ export class FileNotTrackedError extends Error {}
  * @throws Also throws when `git log` exited with non-zero, or when it outputs
  * unexpected text.
  */
-export function getFileCommitDate(
+export async function getFileCommitDate(
   /** Absolute path to the file. */
   file: string,
   args: {
@@ -36,12 +36,12 @@ export function getFileCommitDate(
     /** Use `includeAuthor: true` to get the author information as well. */
     includeAuthor?: false;
   },
-): {
+): Promise<{
   /** Relevant commit date. */
   date: Date;
   /** Timestamp in **seconds**, as returned from git. */
   timestamp: number;
-};
+}>;
 /**
  * Fetches the git history of a file and returns a relevant commit date.
  * It gets the commit date instead of author date so that amended commits
@@ -52,7 +52,7 @@ export function getFileCommitDate(
  * @throws Also throws when `git log` exited with non-zero, or when it outputs
  * unexpected text.
  */
-export function getFileCommitDate(
+export async function getFileCommitDate(
   /** Absolute path to the file. */
   file: string,
   args: {
@@ -63,15 +63,16 @@ export function getFileCommitDate(
     age?: 'oldest' | 'newest';
     includeAuthor: true;
   },
-): {
+): Promise<{
   /** Relevant commit date. */
   date: Date;
   /** Timestamp in **seconds**, as returned from git. */
   timestamp: number;
   /** The author's name, as returned from git. */
   author: string;
-};
-export function getFileCommitDate(
+}>;
+
+export async function getFileCommitDate(
   file: string,
   {
     age = 'oldest',
@@ -80,11 +81,11 @@ export function getFileCommitDate(
     age?: 'oldest' | 'newest';
     includeAuthor?: boolean;
   },
-): {
+): Promise<{
   date: Date;
   timestamp: number;
   author?: string;
-} {
+}> {
   if (!shell.which('git')) {
     throw new GitNotFoundError(
       `Failed to retrieve git history for "${file}" because git is not installed.`,
@@ -105,11 +106,24 @@ export function getFileCommitDate(
     .filter(Boolean)
     .join(' ');
 
-  const result = shell.exec(`git log ${args} -- "${path.basename(file)}"`, {
-    // Setting cwd is important, see: https://github.com/facebook/docusaurus/pull/5048
-    cwd: path.dirname(file),
-    silent: true,
+  const result = await new Promise<{
+    code: number;
+    stdout: string;
+    stderr: string;
+  }>((resolve) => {
+    shell.exec(
+      `git log ${args} -- "${path.basename(file)}"`,
+      {
+        // Setting cwd is important, see: https://github.com/facebook/docusaurus/pull/5048
+        cwd: path.dirname(file),
+        silent: true,
+      },
+      (code, stdout, stderr) => {
+        resolve({code, stdout, stderr});
+      },
+    );
   });
+
   if (result.code !== 0) {
     throw new Error(
       `Failed to retrieve the git history for file "${file}" with exit code ${result.code}: ${result.stderr}`,