feat(@angular-devkit/core): add workspace getProjectByPath

packages/angular_devkit/core/src/workspace/workspace.ts

@@ -12,9 +12,12 @@ import {
   JsonObject,
   JsonParseMode,
   Path,
+  isAbsolute,
   join,
   normalize,
   parseJson,
+  relative,
+  resolve,
   schema,
   virtualFs,
 } from '..';
@@ -143,6 +146,38 @@ export class Workspace {
     return null;
   }
 
+  getProjectByPath(path: Path): string | null {
+    this._assertLoaded();
+
+    const projectNames = this.listProjectNames();
+    if (projectNames.length === 1) {
+      return projectNames[0];
+    }
+
+    const isInside = (base: Path, potential: Path): boolean => {
+      const absoluteBase = resolve(this.root, base);
+      const absolutePotential = resolve(this.root, potential);
+      const relativePotential = relative(absoluteBase, absolutePotential);
+      if (!relativePotential.startsWith('..') && !isAbsolute(relativePotential)) {
+        return true;
+      }
+
+      return false;
+    };
+
+    const projects = this.listProjectNames()
+      .map(name => [this.getProject(name).root, name] as [Path, string])
+      .filter(tuple => isInside(tuple[0], path))
+      // Sort tuples by depth, with the deeper ones first.
+      .sort((a, b) => isInside(a[0], b[0]) ? 1 : 0);
+
+    if (projects[0]) {
+      return projects[0][1];
+    }
+
+    return null;
+  }
+
   getCli() {
     return this._getTool('cli');
   }

packages/angular_devkit/core/src/workspace/workspace_spec.ts

@@ -202,14 +202,34 @@ describe('Workspace', () => {
     ).subscribe(undefined, done.fail, done);
   });
 
-  it('gets default project when there is a single one', (done) => {
+  it('gets default project returns null when there is none', (done) => {
     const customWorkspaceJson = { ...workspaceJson, defaultProject: undefined, projects: {} };
     const workspace = new Workspace(root, host);
     workspace.loadWorkspaceFromJson(customWorkspaceJson).pipe(
       tap((ws) => expect(ws.getDefaultProject()).toEqual(null)),
     ).subscribe(undefined, done.fail, done);
   });
 
+  it('gets project by path', (done) => {
+    const workspace = new Workspace(root, host);
+    workspace.loadWorkspaceFromJson(workspaceJson).pipe(
+      tap((ws) => expect(ws.getProjectByPath(ws.root)).toEqual('app')),
+    ).subscribe(undefined, done.fail, done);
+  });
+
+  it('gets closest project by path', (done) => {
+    const app = workspaceJson.projects['app'];
+    const anotherAppRoot = join(normalize(app.root), 'folder');
+    const customWorkspaceJson = { ...workspaceJson, projects: {
+      'app': app,
+      'another-app': { ...app, root: anotherAppRoot},
+    } };
+    const workspace = new Workspace(root, host);
+    workspace.loadWorkspaceFromJson(customWorkspaceJson).pipe(
+      tap((ws) => expect(ws.getProjectByPath(anotherAppRoot)).toEqual('another-app')),
+    ).subscribe(undefined, done.fail, done);
+  });
+
   it('gets workspace cli', (done) => {
     const workspace = new Workspace(root, host);
     workspace.loadWorkspaceFromJson(workspaceJson).pipe(