Allow running flow on every edit as per flow#26

README.md

@@ -20,6 +20,7 @@ Follow the [instructions](https://code.visualstudio.com/docs/editor/extension-ga
 * `flow.enabled` (default: true) you can disable flow for some Project for example
 * `flow.useNPMPackagedFlow` (default: false) you can also run Flow by defining it in your `package.json`
 * `flow.showStatus` (default: `true`) If `true` will display a spinner in the statusbar while flow is type checking.
+* `flow.runOnEdit` (default: `true`) If `true` will run flow on every edit, otherwise will run only when changes are saved.
 
 ## Features
 

lib/flowDiagnostics.js

@@ -15,6 +15,7 @@ import {Status} from './flowStatus'
 import type {DiagnosticCollection, Disposable} from 'vscode';
 
 import {flowFindDiagnostics} from './pkg/flow-base/lib/FlowService';
+import {isRunOnEditEnabled} from './utils/util'
 
 let lastDiagnostics: null | DiagnosticCollection = null;
 const status = new Status()
@@ -37,20 +38,27 @@ export function setupDiagnostics(disposables: Array<Disposable>): void {
 			updateDiagnostics(vscode.window.activeTextEditor.document);
 		}
 	}));
+
+	disposables.push(vscode.workspace.onDidChangeTextDocument(event => {
+		const isDocumentActive = vscode.window.activeTextEditor.document === event.document;
+		if (isDocumentActive && isRunOnEditEnabled()) {
+			updateDiagnostics(event.document, event.document.getText());
+		}
+	}));
 }
 
-async function updateDiagnostics(document) {
+async function updateDiagnostics(document, content:?string) {
 	status.busy()
 	try {
-		let diagnostics = await getDiagnostics(document)
+		let diagnostics = await getDiagnostics(document, content)
 		applyDiagnostics(diagnostics)
 	} catch(error) {
 		console.error(error)
 	}
 	status.idle()
 }
 
-async function getDiagnostics(document) {
+async function getDiagnostics(document, content:?string) {
 	let diags = Object.create(null);
 
 	if (!document) {
@@ -65,7 +73,7 @@ async function getDiagnostics(document) {
 	// flowFindDiagnostics takes the provided filePath and then walks up directories
 	// until a .flowconfig is found. The diagnostics are then valid for the entire
 	// flow workspace.
-	let rawDiag = await flowFindDiagnostics(filePath);
+	let rawDiag = await flowFindDiagnostics(filePath, content);
 	if (rawDiag && rawDiag.messages) {
 		const { flowRoot } = rawDiag;
 

lib/utils/util.js

@@ -18,6 +18,10 @@ export function isFlowStatusEnabled():boolean {
 	return workspace.getConfiguration('flow').get('showStatus')
 }
 
+export function isRunOnEditEnabled():boolean {
+	return workspace.getConfiguration('flow').get('runOnEdit')
+}
+
 export function checkNode() {
 	try {
 		const check = spawn(process.platform === 'win32' ? 'where' : 'which', ['node'])

package.json

@@ -37,6 +37,11 @@
                     "default": true,
                     "description": "If true will display flow status is the statusbar"
                 },
+                "flow.runOnEdit": {
+                    "type": "boolean",
+                    "default": true,
+                    "description": "If true will run flow on every edit, otherwise will run only when changes are saved"
+                },
                 "flow.stopFlowOnExit": {
                     "type": "boolean",
                     "default": true,