[server] infer extensions and add a comment

components/server/src/config/config-inferrer.spec.ts

@@ -23,6 +23,36 @@ async function expect(files: {[path:string]:string}, config: WorkspaceConfig): P
     chai.assert.equal(JSON.stringify(result, null, '  '), JSON.stringify(config, null, '  '));
 }
 
+describe('config serializer', () => {
+    it('serialized proper YAML',
+        async () => {
+            const config: WorkspaceConfig = {
+                tasks: [
+                    {
+                        'init': "yarn install",
+                        'command': "yarn run build"
+                    }
+                ],
+                vscode: {
+                    extensions: [
+                        'foo', 'bar'
+                    ]
+                }
+            }
+            const cf = new ConfigInferrer()
+            chai.assert.equal(cf.toYaml(config),
+`tasks:
+  - init: yarn install
+    command: yarn run build
+vscode:
+  extensions:
+    - foo
+    - bar
+`);
+        }
+    )
+});
+
 describe('config inferrer', () => {
     it('check node',
         async () => expect({
@@ -43,7 +73,12 @@ describe('config inferrer', () => {
                     init: "yarn install && yarn run build",
                     command: "yarn run watch"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'dbaeumer.vscode-eslint'
+                ]
+            }
         })
     ),
     it('[java] mvn wrapper',
@@ -55,7 +90,14 @@ describe('config inferrer', () => {
                 {
                     init: "./mvnw install -DskipTests=false"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'redhat.java',
+                    'vscjava.vscode-java-debug',
+                    'vscjava.vscode-maven'
+                ]
+            }
         })
     ),
     it('[java] mvn',
@@ -66,7 +108,14 @@ describe('config inferrer', () => {
                 {
                     init: "mvn install -DskipTests=false"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'redhat.java',
+                    'vscjava.vscode-java-debug',
+                    'vscjava.vscode-maven'
+                ]
+            }
         })
     ),
     it('[java] gradle',
@@ -78,7 +127,13 @@ describe('config inferrer', () => {
                 {
                     init: "gradle build"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'redhat.java',
+                    'vscjava.vscode-java-debug'
+                ]
+            }
         })
     ),
     it('[java] gradle wrapper',
@@ -90,7 +145,13 @@ describe('config inferrer', () => {
                 {
                     init: "./gradlew build"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'redhat.java',
+                    'vscjava.vscode-java-debug'
+                ]
+            }
         })
     ),
     it('[python] pip install',
@@ -101,7 +162,12 @@ describe('config inferrer', () => {
                 {
                     init: "pip install -r requirements.txt"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'ms-python.python'
+                ]
+            }
         })
     ),
     it('[go] go install',
@@ -113,7 +179,12 @@ describe('config inferrer', () => {
                     init: "go get && go build ./... && go test ./...",
                     command: "go run"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'golang.go'
+                ]
+            }
         })
     ),
     it('[rust] cargo',
@@ -125,7 +196,12 @@ describe('config inferrer', () => {
                     init: "cargo build",
                     command: "cargo watch -x run"
                 }
-            ]
+            ],
+            vscode: {
+                extensions: [
+                    'matklad.rust-analyzer'
+                ]
+            }
         })
     ),
     it('[make] make',

components/server/src/config/config-inferrer.ts

@@ -65,6 +65,7 @@ export class ConfigInferrer {
         } catch (e) {
             console.log(e, pckjsonContent);
         }
+        this.addExtension(ctx, 'dbaeumer.vscode-eslint');
     }
 
     protected async checkJava(ctx: Context): Promise<void> {
@@ -74,6 +75,8 @@ export class ConfigInferrer {
                 cmd = './gradlew';
             }
             this.addCommand(ctx.config, cmd + ' build', 'init');
+            this.addExtension(ctx, 'redhat.java');
+            this.addExtension(ctx, 'vscjava.vscode-java-debug');
             return;
         }
         if (await ctx.exists('pom.xml')) {
@@ -82,10 +85,23 @@ export class ConfigInferrer {
                 cmd = './mvnw';
             }
             this.addCommand(ctx.config, cmd + ' install -DskipTests=false', 'init');
+            this.addExtension(ctx, 'redhat.java');
+            this.addExtension(ctx, 'vscjava.vscode-java-debug');
+            this.addExtension(ctx, 'vscjava.vscode-maven');
             return;
         }
     }
 
+    protected addExtension(ctx: Context, extensionName: string) {
+        if (!ctx.config.vscode || !ctx.config.vscode.extensions) {
+            ctx.config.vscode = {
+                extensions: []
+            };
+        }
+        if (ctx.config.vscode.extensions?.indexOf(extensionName) === -1)
+            ctx.config.vscode.extensions!.push(extensionName);
+    }
+
     protected async isMake(ctx: Context) {
         return await ctx.exists('Makefile') || await ctx.exists('makefile');
     }
@@ -105,15 +121,20 @@ export class ConfigInferrer {
         }
         if (await ctx.exists('requirements.txt')) {
             this.addCommand(ctx.config, 'pip install -r requirements.txt', 'init');
+            this.addExtension(ctx, 'ms-python.python');
         } else if (await ctx.exists('setup.py')) {
             this.addCommand(ctx.config, 'pip install .', 'init');
+            this.addExtension(ctx, 'ms-python.python');
         }
         if (await ctx.exists('main.py')) {
             this.addCommand(ctx.config, 'python main.py', 'command');
+            this.addExtension(ctx, 'ms-python.python');
         } else if (await ctx.exists('app.py')) {
             this.addCommand(ctx.config, 'python app.py', 'command');
+            this.addExtension(ctx, 'ms-python.python');
         } else if (await ctx.exists('runserver.py')) {
             this.addCommand(ctx.config, 'python runserver.py', 'command');
+            this.addExtension(ctx, 'ms-python.python');
         }
     }
 
@@ -123,13 +144,15 @@ export class ConfigInferrer {
             this.addCommand(ctx.config, 'go build ./...', 'init');
             this.addCommand(ctx.config, 'go test ./...', 'init');
             this.addCommand(ctx.config, 'go run', 'command');
+            this.addExtension(ctx, 'golang.go');
         }
     }
 
     protected async checkRust(ctx: Context) {
         if (await ctx.exists('Cargo.toml')) {
             this.addCommand(ctx.config, 'cargo build', 'init');
             this.addCommand(ctx.config, 'cargo watch -x run', 'command');
+            this.addExtension(ctx, 'matklad.rust-analyzer');
         }
     }
 
@@ -166,4 +189,19 @@ export class ConfigInferrer {
         }
         config.tasks[0][phase] = (existing ? existing + ' && ' : '') + command;
     }
+
+    toYaml(config: WorkspaceConfig): string {
+        const i = '  ';
+        let tasks = '';
+        if (config.tasks) {
+            tasks = `tasks:\n${i}- ${config.tasks.map(task => Object.entries(task).map(([phase, command]) => `${phase}: ${command}`).join('\n    ')).join('\n  - ')}`
+        }
+        let vscode = '';
+        if (config.vscode?.extensions) {
+            vscode = `vscode:\n${i}extensions:\n${config.vscode.extensions.map(extension => `${i + i}- ${extension}`).join('\n')}`
+        }
+        return `${tasks}
+${vscode}
+`;
+    }
 }

components/server/src/config/configuration-service.ts

@@ -36,16 +36,22 @@ export class ConfigurationService {
         }
         // eagerly fetch for all files that the inferrer usually asks for.
         this.requestedPaths.forEach(path => !(path in cache) && readFile(path));
-        const config: WorkspaceConfig = await new ConfigInferrer().getConfig({
+        const configInferrer = new ConfigInferrer();
+        const config: WorkspaceConfig = await configInferrer.getConfig({
             config: {},
             read: readFile,
             exists: async (path: string) => !!(await readFile(path)),
         });
         if (!config.tasks) {
             return;
         }
-        const configString = `tasks:\n  - ${config.tasks.map(task => Object.entries(task).map(([phase, command]) => `${phase}: ${command}`).join('\n    ')).join('\n  - ')}`;
-        return configString;
+        const configString = configInferrer.toYaml(config);
+        return `# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
+# and commit this file to your remote git repository to share the goodness with others.
+
+${configString}
+`;
     }
 
     async fetchRepositoryConfiguration(ctx: TraceContext, user: User, contextURL: string): Promise<string | undefined> {
@@ -54,7 +60,6 @@ export class ConfigurationService {
         return configString;
     }
 
-
     protected async getRepositoryFileProviderAndCommitContext(ctx: TraceContext, user: User, contextURLOrContext: string | CommitContext): Promise<{fileProvider: FileProvider, commitContext: CommitContext}> {
         let commitContext: CommitContext;
         if (typeof contextURLOrContext === 'string') {