Add continuousEval via config + error to file (#47)

* Add continuousEval via config + error to file

* Lint fix

* Same thing but for eval expression
+ bump version

---------

Co-authored-by: Lorenz Boguhn <Lorenz.Boguhn@ppi.de>
Co-authored-by: Julien Duchesne <julien.duchesne@grafana.com>

Author: 3 people

package-lock.json

@@ -5,7 +5,7 @@
 	"description": "Full code support (formatting, highlighting, navigation, debugging etc) for Jsonnet",
 	"license": "Apache License Version 2.0",
 	"publisher": "Grafana",
-	"version": "0.6.1",
+	"version": "0.7.0",
 	"repository": {
 		"type": "git",
 		"url": "https://github.com/grafana/vscode-jsonnet"
@@ -215,6 +215,12 @@
 					"default": false,
 					"description": "If enabled, the LSP will publish eval diagnostics. May produce false positives as the evaluator may not have the full evaluation context. Also, if you work with very large jsonnet projects, you may want to disable this for performance reasons"
 				},
+				"jsonnet.languageServer.continuousEval": {
+					"scope": "resource",
+					"type": "boolean",
+					"default": true,
+					"description": "Whether to continuously evaluate the selected file"
+				},
 				"jsonnet.languageServer.lint": {
 					"scope": "resource",
 					"type": "boolean",

package.json

@@ -89,7 +89,8 @@ export async function activate(context: ExtensionContext): Promise<void> {
         command: `jsonnet.evalItem`,
         arguments: [evalFilePath(editor), editor.selection.active],
       };
-      evalAndDisplay(params, false);
+      const tempFile = createTmpFile(false);
+      evalAndDisplay(params, false, tempFile);
     }),
     commands.registerCommand('jsonnet.evalFile', evalFileFunc(false)),
     commands.registerCommand('jsonnet.evalFileYaml', evalFileFunc(true)),
@@ -100,49 +101,122 @@ export async function activate(context: ExtensionContext): Promise<void> {
 
 function evalFileFunc(yaml: boolean) {
   return async () => {
-    const editor = window.activeTextEditor;
+    const currentFilePath = evalFilePath(window.activeTextEditor);
     const params: ExecuteCommandParams = {
       command: `jsonnet.evalFile`,
-      arguments: [evalFilePath(editor)],
+      arguments: [currentFilePath],
     };
-    evalAndDisplay(params, yaml);
+    const tempFile = createTmpFile(yaml);
+    const uri = Uri.file(tempFile);
+
+    fs.writeFileSync(tempFile, '"Evaluating..."');
+
+    if (workspace.getConfiguration('jsonnet').get('languageServer.continuousEval') === false) {
+      evalAndDisplay(params, yaml, tempFile);
+    }
+    else {
+
+      // Initial eval
+      evalOnDisplay(params, yaml, tempFile);
+
+      const watcher = workspace.createFileSystemWatcher(currentFilePath);
+
+      window.showTextDocument(uri, {
+        preview: true,
+        viewColumn: ViewColumn.Beside,
+        preserveFocus: true,
+      });
+      watcher.onDidChange((e) => {
+        evalOnDisplay(params, yaml, tempFile);
+      }
+      );
+    }
   };
 }
 
+function createTmpFile(yaml): string {
+  const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'jsonnet-eval'));
+  const fileEnding = yaml ? 'yaml' : 'json';
+  const tempFile = path.join(tempDir, `result.${fileEnding}`);
+  return tempFile;
+}
+
 function evalExpressionFunc(yaml: boolean) {
   return async () => {
-    const editor = window.activeTextEditor;
     window.showInputBox({ prompt: 'Expression to evaluate' }).then(async (expr) => {
       if (expr) {
+        const currentFilePath = evalFilePath(window.activeTextEditor);
         const params: ExecuteCommandParams = {
           command: `jsonnet.evalExpression`,
-          arguments: [evalFilePath(editor), expr],
+          arguments: [currentFilePath, expr],
         };
-        evalAndDisplay(params, yaml);
+        const tempFile = createTmpFile(yaml);
+        const uri = Uri.file(tempFile);
+
+        fs.writeFileSync(tempFile, '"Evaluating..."');
+
+        if (workspace.getConfiguration('jsonnet').get('languageServer.continuousEval') === false) {
+          evalAndDisplay(params, yaml, tempFile);
+        }
+        else {
+          // Initial eval
+          evalOnDisplay(params, yaml, tempFile);
+
+          const watcher = workspace.createFileSystemWatcher(currentFilePath);
+
+          window.showTextDocument(uri, {
+            preview: true,
+            viewColumn: ViewColumn.Beside,
+            preserveFocus: true,
+          });
+          watcher.onDidChange((e) => {
+            evalOnDisplay(params, yaml, tempFile);
+          }
+          );
+        }
       } else {
         window.showErrorMessage('No expression provided');
       }
     });
   };
 }
 
-function evalAndDisplay(params: ExecuteCommandParams, yaml: boolean): void {
+function evalOnDisplay(params: ExecuteCommandParams, yaml: boolean, tempFile: string): void {
+  channel.appendLine(`Sending eval request: ${JSON.stringify(params)}`);
+  client
+    .sendRequest(ExecuteCommandRequest.type, params)
+    .then((result) => {
+      let uri = Uri.file(tempFile);
+      fs.writeFileSync(tempFile, result);
+
+      if (yaml) {
+        const file = fs.readFileSync(tempFile, 'utf8');
+        const parsed = JSON.parse(file);
+        const yamlString = stringifyYaml(parsed);
+        uri = Uri.file(tempFile);
+        fs.writeFileSync(tempFile, yamlString);
+      }
+    })
+    .catch((err) => {
+      window.showErrorMessage(err.message);
+      fs.writeFileSync(tempFile, err.message);
+    });
+}
+
+function evalAndDisplay(params: ExecuteCommandParams, yaml: boolean, tempFile: string): void {
   channel.appendLine(`Sending eval request: ${JSON.stringify(params)}`);
   client
     .sendRequest(ExecuteCommandRequest.type, params)
     .then((result) => {
-      const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'jsonnet-eval'));
-      const tempFile = path.join(tempDir, 'result.json');
       let uri = Uri.file(tempFile);
       fs.writeFileSync(tempFile, result);
 
       if (yaml) {
         const file = fs.readFileSync(tempFile, 'utf8');
         const parsed = JSON.parse(file);
         const yamlString = stringifyYaml(parsed);
-        const tempYamlFile = path.join(tempDir, 'result.yaml');
-        uri = Uri.file(tempYamlFile);
-        fs.writeFileSync(tempYamlFile, yamlString);
+        uri = Uri.file(tempFile);
+        fs.writeFileSync(tempFile, yamlString);
       }
       window.showTextDocument(uri, {
         preview: true,
@@ -151,6 +225,12 @@ function evalAndDisplay(params: ExecuteCommandParams, yaml: boolean): void {
     })
     .catch((err) => {
       window.showErrorMessage(err.message);
+      fs.writeFileSync(tempFile, err.message);
+      const uri = Uri.file(tempFile);
+      window.showTextDocument(uri, {
+        preview: true,
+        viewColumn: ViewColumn.Beside,
+      });
     });
 }