feat(nx): add run-many

This adds a run-many command to:

 - make more semantic sense for the --all option
 - to add the ability to specify specific projects to run

It also involves a quite substancial refactoring of affected.ts in order
to attempt reuse of the code in both commands

e2e/affected.test.ts

@@ -7,11 +7,10 @@ import {
   updateFile,
   runCLI,
   forEachCli,
-  supportUi,
-  newProject
+  supportUi
 } from './utils';
 
-let originalCIValue;
+let originalCIValue: any;
 
 forEachCli(() => {
   /**
@@ -131,9 +130,7 @@ forEachCli(() => {
       expect(buildParallel).toContain(`Running target build for projects:`);
       expect(buildParallel).toContain(`- ${myapp}`);
       expect(buildParallel).toContain(`- ${mypublishablelib}`);
-      expect(buildParallel).toContain(
-        'Running target "build" for affected projects succeeded'
-      );
+      expect(buildParallel).toContain('Running target "build" succeeded');
 
       const buildExcluded = runCommand(
         `npm run affected:build -- --files="libs/${mylib}/src/index.ts" --exclude ${myapp}`
@@ -240,9 +237,7 @@ forEachCli(() => {
       const interpolatedTests = runCommand(
         `npm run affected -- --target test --files="libs/${mylib}/src/index.ts" -- --jest-config {project.root}/jest.config.js`
       );
-      expect(interpolatedTests).toContain(
-        `Running target \"test\" for affected projects succeeded`
-      );
+      expect(interpolatedTests).toContain(`Running target \"test\" succeeded`);
     }, 1000000);
   });
 });

e2e/run-many.test.ts

@@ -0,0 +1,48 @@
+import { ensureProject, uniq, runCLI, forEachCli } from './utils';
+
+let originalCIValue: any;
+
+forEachCli(() => {
+  /**
+   * Setting CI=true makes it simpler to configure assertions around output, as there
+   * won't be any colors.
+   */
+  beforeAll(() => {
+    originalCIValue = process.env.CI;
+    process.env.CI = 'true';
+  });
+
+  afterAll(() => {
+    process.env.CI = originalCIValue;
+  });
+
+  describe('Run Many', () => {
+    it('should build specific and all projects', () => {
+      ensureProject();
+      const mylib = uniq('mylib');
+      const mylib2 = uniq('mylib2');
+      const mylib3 = uniq('mylib3');
+      runCLI(`generate @nrwl/angular:lib ${mylib} --publishable`);
+      runCLI(`generate @nrwl/angular:lib ${mylib2} --publishable`);
+      runCLI(`generate @nrwl/angular:lib ${mylib3} --publishable`);
+
+      const buildParallel = runCLI(
+        `run-many --target=build --projects="${mylib},${mylib2}" --parallel`
+      );
+      expect(buildParallel).toContain(`Running target build for projects:`);
+      expect(buildParallel).toContain(`- ${mylib}`);
+      expect(buildParallel).toContain(`- ${mylib2}`);
+      expect(buildParallel).not.toContain(`- ${mylib3}`);
+      expect(buildParallel).toContain('Running target "build" succeeded');
+
+      const buildAllParallel = runCLI(
+        `run-many --target=build --all --parallel`
+      );
+      expect(buildAllParallel).toContain(`Running target build for projects:`);
+      expect(buildAllParallel).toContain(`- ${mylib}`);
+      expect(buildAllParallel).toContain(`- ${mylib2}`);
+      expect(buildAllParallel).toContain(`- ${mylib3}`);
+      expect(buildAllParallel).toContain('Running target "build" succeeded');
+    }, 1000000);
+  });
+});