Added support for ruby.format, defaults to false (no formatting).

package.json

@@ -284,6 +284,12 @@
               }
             }
           }
+        },
+        "ruby.format": {
+          "type": [ "boolean", "string" ],
+          "enum": [ false, "rubocop" ],
+          "default": false,
+          "description": "Which system to use for formatting, or false for no formatting"
         }
       }
     },

readme.md

@@ -136,8 +136,20 @@ Settings available (in your VSCode workspace) for each of the linters:
 ```
 ## Formatting
 
+The VS Code Ruby extension can automatically format your Ruby files whenever you save.
+
+### Rubocop
+
+Set `ruby.format` to `rubocop` to enable rubocop formatting on save.
+
 Formatting requires the rubocop gem to be installed. Note that you may have to turn on some of the AutoCorrect functions in your `.rubocop.yml` file. See the [rubocop documentation](http://rubocop.readthedocs.io/en/latest/configuration/).
 
+Important note: VS Code has a timeout that limits file formatters to 750ms. This is often not enough time for rubocop to complete. In the near future VS Code will allow customizing this timeout via the `editor.formatOnSaveTimeout` setting. See [#43702](https://github.com/Microsoft/vscode/pull/43702) for more details.
+
+### Rufo
+
+Rufo is an alternative Ruby formatting tool. See the [VS Code Rufo Extension](https://github.com/bessey/vscode-rufo) if you want to try it.
+
 ## Autocomplete
 
 The `ruby.codeCompletion` setting lets you select a method for code completion and other intellisense features. Valid options are `solargraph`, `rcodetools`, and `none`.

src/format/rubyFormat.ts

@@ -6,16 +6,18 @@ import { AutoCorrect } from './RuboCop';
 export class RubyDocumentFormattingEditProvider implements vscode.DocumentFormattingEditProvider {
 	private autoCorrect: AutoCorrect;
 
-	constructor() {
-		this.autoCorrect = new AutoCorrect();
-	}
-
 	public register(ctx: vscode.ExtensionContext) {
+		// only attempt to format if ruby.format is set to rubocop
+		if (vscode.workspace.getConfiguration("ruby").get("format") !== "rubocop") {
+			return;
+		}
+
+		this.autoCorrect = new AutoCorrect();
 		this.autoCorrect.test().then(
 			() => ctx.subscriptions.push(
 				vscode.languages.registerDocumentFormattingEditProvider('ruby', this)
-			),
-			() => console.log("Rubocop not installed")
+			)
+					// silent failure - AutoCorrect will handle error messages
 		);
 	}
 
@@ -28,7 +30,7 @@ export class RubyDocumentFormattingEditProvider implements vscode.DocumentFormat
 					return [new vscode.TextEdit(document.validateRange(new vscode.Range(0, 0, Infinity, Infinity)), result)];
 				},
 				err => {
-					console.log("Failed to format:", err);
+					// silent failure - AutoCorrect will handle error messages
 					return [];
 				}
 			);