fix(schematics): fix format command to handle large number of files

e2e/schematics/command-line.test.ts

@@ -88,7 +88,21 @@ describe('Command line', () => {
       updateFile(
         'apps/myapp/src/main.ts',
         `
-         const x = 3232;
+         const x = 1111;
+    `
+      );
+
+      updateFile(
+        'apps/myapp/src/app/app.module.ts',
+        `
+         const y = 1111;
+    `
+      );
+
+      updateFile(
+        'apps/myapp/src/app/app.component.ts',
+        `
+         const z = 1111;
     `
       );
 
@@ -97,7 +111,22 @@ describe('Command line', () => {
         fail('boom');
       } catch (e) {
         expect(e.stdout.toString()).toContain('apps/myapp/src/main.ts');
+        expect(e.stdout.toString()).toContain('apps/myapp/src/app/app.module.ts');
+        expect(e.stdout.toString()).toContain('apps/myapp/src/app/app.component.ts');
       }
+      runCommand(
+        'npm run format:write -- --files="apps/myapp/src/app/app.module.ts,apps/myapp/src/app/app.component.ts"'
+      );
+
+      try {
+        runCommand('npm run -s format:check');
+        fail('boom');
+      } catch (e) {
+        expect(e.stdout.toString()).toContain('apps/myapp/src/main.ts');
+        expect(e.stdout.toString()).not.toContain('apps/myapp/src/app/app.module.ts');
+        expect(e.stdout.toString()).not.toContain('apps/myapp/src/app/app.component.ts');
+      }
+
       runCommand('npm run format:write');
       expect(runCommand('npm run -s format:check')).toEqual('');
     },

packages/schematics/src/command-line/format.ts

@@ -14,18 +14,18 @@ switch (command) {
     break;
 }
 
-function parseFiles() {
+function parseFiles(): string[] {
   const args = process.argv.slice(3);
   if (args.length === 0) {
-    return '"{apps,libs}/**/*.ts"';
+    return ['"{apps,libs}/**/*.ts"'];
   }
   const dashDashFiles = args.filter(a => a.startsWith('--files='))[0];
   if (dashDashFiles) {
     args.splice(args.indexOf(dashDashFiles), 1);
-    return `"${parseDashDashFiles(dashDashFiles).join(',')}"`;
+    return parseDashDashFiles(dashDashFiles).map(t => `\"${t}\"`);
   } else {
     const withoutShahs = args.slice(2);
-    return `"${getFilesFromShash(args[0], args[1]).join(',')}"`;
+    return getFilesFromShash(args[0], args[1]).map(t => `\"${t}\"`);
   }
 }
 
@@ -42,19 +42,22 @@ function getFilesFromShash(sha1: string, sha2: string): string[] {
     .toString('utf-8')
     .split('\n')
     .map(a => a.trim())
-    .filter(a => a.length > 0);
+    .filter(a => a.length > 0)
+    .filter(a => path.extname(a) === '.ts');
 }
 
-function write(files: string) {
+function write(files: string[]) {
-  execSync(`node ./node_modules/prettier/bin/prettier.js --single-quote --print-width 120 --write ${files}`, {
+  execSync(`node ./node_modules/prettier/bin/prettier.js --single-quote --print-width 120 --write ${files.join(' ')}`, {
     stdio: [0, 1, 2]
   });
 }
 
-function check(files: string) {
+function check(files: string[]) {
   try {
     execSync(
-      `node ./node_modules/prettier/bin/prettier.js --single-quote --print-width 120 --list-different ${files}`,
+      `node ./node_modules/prettier/bin/prettier.js --single-quote --print-width 120 --list-different ${files.join(
+        ' '
+      )}`,
       {
         stdio: [0, 1, 2]
       }