Fix #21

package.json

@@ -125,7 +125,8 @@
 	"dependencies": {
 		"xmldom": "DotJoshJohnson/xmldom#2794915",
 		"xpath": "^0.0.9",
-        "xqlint": "^0.2.9"
+        "xqlint": "^0.2.9",
+        "opener": "^1.4.1"
 	},
     "scripts": {
         "vscode:prepublish": "tsc"

src/providers/Execution.ts

@@ -9,6 +9,9 @@ const CFG_XQARGS: string = 'xqueryExecutionArguments';
 
 export class XQueryExecutionProvider {
     static async executeXQueryAsync(editor: vsc.TextEditor): Promise<void> {
+        // this disposable will be used for creating status bar messages
+        let disposable: vsc.Disposable;
+        
         if (editor.document.languageId !== 'xquery') {
             vsc.window.showErrorMessage('This action can only be performed on an XQuery file.');
             return;
@@ -27,8 +30,20 @@ export class XQueryExecutionProvider {
             return;
         }
         
+        let inputFile: vsc.Uri;
+        disposable = vsc.window.setStatusBarMessage('Searching for XML files in folder...');
         let files: vsc.Uri[] = await vsc.workspace.findFiles('**/*.xml', '', 100);
+        disposable.dispose();
         
+        // user does not have a folder open - prompt for file name
+        if (typeof files === 'undefined') {
+            vsc.window.showErrorMessage('You must have a folder opened in VS Code to use this feature.');
+            return;
+        }
+        
+        // if there is only one XML file, default it
+        // otherwise, prompt the user to select one from the open folder
+        if (files.length > 1) {
             let qpItems: any[] = new Array<any>();
             
             files.forEach((file) => {
@@ -47,13 +62,67 @@ export class XQueryExecutionProvider {
                 return;
             }
             
-        let disposable: vsc.Disposable = vsc.window.setStatusBarMessage('Executing XQuery Script...');
+            inputFile = selection.file;
+        }
+        
+        else {
+            inputFile = files[0];
+        }
+        
+        // prompt for output file name
+        let outputPath: string = null;
+        let outputPathPos: number = -1;
+        
+        for (let i = 0; i < args.length; i++) {
+            if (i > 0) {
+                if (args[i - 1].search(/out|result/)) {
+                    outputPath = args[i];
+                    outputPathPos = i;
+                }
+            }
+        }
+        
+        if (outputPath) {
+            outputPath = await vsc.window.showInputBox({
+                placeHolder: 'ex. C:\\TEMP\XQueryOutput\\MyOutputFile.xml',
+                prompt: 'Please specify the output file path. Existing file behavior is determined by the execution engine you have specified.',
+                value: outputPath
+            });
+            
+            args[outputPathPos] = outputPath;
+        }
+        
+        // call out to the execution engine
+        disposable = vsc.window.setStatusBarMessage('Executing XQuery Script...');
         args = args.map<string>((value: string) => {
             return value
                 .replace('$(script)', editor.document.uri.fsPath)
-                .replace('$(input)', selection.file.fsPath);
+                .replace('$(input)', inputFile.fsPath);
         });
+        
+        try {
             await ChildProcess.spawnAsync(executable, args);
+        }
+        
+        catch (error) {            
+            if (error.message.search(/[Ll]ine:?\s*\d+/gm) > -1) {
+                let match: RegExpExecArray = /[Ll]ine:?\s*\d+/gm.exec(error.message);
+                let line: number = (Number.parseInt(match[0].replace(/([Ll]ine:?\s*)|\s/, '')) - 1);
+                
+                let selection: string = await vsc.window.showErrorMessage(error.message, `Go to Line ${line}`);
+                
+                if (selection == `Go to Line ${line}`) {
+                    editor.revealRange(new vsc.Range(line, 0, line, 0));
+                }
+            }
+            
+            else {
+                vsc.window.showErrorMessage(error.message);
+            }
+        }
+        
+        finally {
             disposable.dispose();
         }
     }
+}

src/providers/XPath.ts

@@ -59,7 +59,17 @@ export class XPathFeatureProvider {
             
             // run the query
             let xml: string = editor.document.getText();
-            let nodes: Node[] = XPathEvaluator.evaluate(query, xml, ignoreDefaultNamespace);
+            let nodes: Node[];
+            
+            try {
+                nodes = XPathEvaluator.evaluate(query, xml, ignoreDefaultNamespace);
+            }
+            
+            catch (error) {
+                console.error(error);
+                vsc.window.showErrorMessage(`Something went wrong while evaluating the XPath: ${error}`);
+                return;
+            }
             
             // show the results to the user
             let outputChannel: vsc.OutputChannel = vsc.window.createOutputChannel(OUTPUT_CHANNEL);

src/services/ChildProcess.ts

@@ -6,15 +6,24 @@ export class ChildProcess {
     static async spawnAsync(executable: string, args: string[]): Promise<void> {
         return new Promise<void>((resolve, reject) => {
            
+           let output: string = '';
            let handle = child_process.spawn(executable, args);
            
+           handle.stdout.on('data', (data: string) => {
+               output += data;
+           });
+           
+           handle.stderr.on('data', (data: string) => {
+               output += data;
+           });
+           
            handle.on('close', (code: string) => {
                if (code == '0') {
                    resolve();
                }
                
                else {
-                   reject(code);
+                   reject({ code: code, message: output });
                }
            });