feat(ng-dev/format): add staged-re command

add a staged-re command which after formatting the staged files also
re adds them to the staging area

ng-dev/format/cli.ts

@@ -53,6 +53,19 @@ export function buildFormatParser(localYargs: yargs.Argv) {
         process.exitCode = await executionCmd(allStagedFiles);
       },
     )
+    .command(
+      'staged-re',
+      `Run the formatter on all staged files and re-stages the
+       formatted files (this command ignores the --check option)`,
+      (args) => args,
+      async () => {
+        const allStagedFiles = GitClient.get().allStagedFiles();
+        process.exitCode = await formatFiles(allStagedFiles);
+        if (process.exitCode === 0) {
+          GitClient.get().stageFiles(allStagedFiles);
+        }
+      },
+    )
     .command(
       'files <files..>',
       'Run the formatter on provided files',

ng-dev/utils/git/git-client.ts

@@ -197,6 +197,11 @@ export class GitClient {
     );
   }
 
+  /** Adds the provided files to the staging area. */
+  stageFiles(files: string[]) {
+    return gitOutputAsArray(this.runGraceful(['add', files.join(' ')]));
+  }
+
   /** Retrieve a list of all files tracked in the repository. */
   allFiles(): string[] {
     return gitOutputAsArray(this.runGraceful(['ls-files']));