Fixes formatting and enables basic systax error check.

src/crystalDiagnostic.ts

@@ -1,5 +1,4 @@
 import * as vscode from "vscode"
-import { spawn } from "child_process"
 
 import { Concurrent, isNotLib, spawnCompiler } from "./crystalUtils"
 

src/crystalFormatting.ts

@@ -1,7 +1,7 @@
 import * as vscode from "vscode"
 import { spawn } from "child_process"
 
-import { searchProblems, childOnStd, childOnError } from "./crystalUtils"
+import { searchProblemsFromRaw, childOnStd, childOnError } from "./crystalUtils"
 
 /**
  * Formatting provider using VSCode module
@@ -42,7 +42,8 @@ export class CrystalFormattingProvider implements vscode.DocumentFormattingEditP
 		// }
 
 		// QuickFix to replace current code with formated one only if no syntax error is found
-		if (!response.toString().startsWith("Error:")) {
+		if ((searchProblemsFromRaw(response.toString(), document.uri).length == 0) &&
+			response.toString().length > 0) {
 			let lastLineId = document.lineCount - 1
 			let range = new vscode.Range(0, 0, lastLineId, document.lineAt(lastLineId).text.length)
 			textEditData = [vscode.TextEdit.replace(range, response.toString())]

src/crystalUtils.ts

@@ -191,6 +191,47 @@ export function searchProblems(response: string, uri: vscode.Uri) {
 	return diagnostics
 }
 
+/**
+ * Parse raw output from crystal tool format - response and create diagnostics
+ */
+export function searchProblemsFromRaw(response: string, uri: vscode.Uri) {
+	let diagnostics = []
+
+	const config = vscode.workspace.getConfiguration("crystal-lang")
+
+	let responseData = response.match(/.* in (.*):(\d+): (.*)/)
+
+	let parsedLine:number
+
+	try {
+		parsedLine = parseInt(responseData[2])
+	} catch (e) {
+		parsedLine = 0
+	}
+
+	let columnLocation = 1 // No way to get column from crystal tool format -
+
+	if (parsedLine != 0) {
+		let problem = {
+			line: parsedLine,
+			column: columnLocation,
+			message: responseData[3]
+		}
+
+		let range = new vscode.Range(problem.line - 1, problem.column - 1, problem.line - 1, problem.column - 1)
+		let diagnostic = new vscode.Diagnostic(range, problem.message, vscode.DiagnosticSeverity.Error)
+		diagnostics.push([uri, [diagnostic]])
+	}
+
+	if (diagnostics.length == 0) {
+		diagnosticCollection.clear()
+	} else if (config["problems"] != "none") {
+		diagnosticCollection.set(diagnostics)
+	}
+
+	return diagnostics
+}
+
 /**
  * Execute Crystal tools context and implementations
  */
@@ -258,24 +299,24 @@ export function spawnCompiler(document, build) {
 			]
 		}
 		return [
-			"build",
-			"--no-debug",
+			"tool",
+			"format",
+			"--check",
 			"--no-color",
-			"--no-codegen",
-			scope,
-			"-f",
-			"json"
+			scope
 		]
 	})()
 	let child = spawn(config["compiler"], args, spawnOptions)
 	childOnStd(child, "data", (data) => {
 		response += data
 	})
 	childOnStd(child, "end", () => {
-		searchProblems(response.toString(), document.uri)
 		if (build) {
+			searchProblems(response.toString(), document.uri)
 			Concurrent.counter -= 1
 			statusBarItem.hide()
+		} else {
+			searchProblemsFromRaw(response.toString(), document.uri)
 		}
 	})
 	childOnError(child)