feature #6: support for project file (#14)

* feature #6: support for project file

* updated readme

Author: davidramnero

README.md

@@ -9,7 +9,7 @@
 - **Configurable severity threshold**: Filter out messages below a chosen severity level (`info`, `warning`, or `error`).
 - **Set C/C++ standard**: Easily specify `--std=<id>` (e.g. `c++17`, `c99`, etc.).
 - **Diagnostic cleanup**: When you close a file, its diagnostics are automatically cleared.
-
+- **Project file support**: You can feed your project file to cppcheck through the `--project` flag in the `cppcheck-official.arguments` field in the extension settings.
 ## Requirements
 
  **Cppcheck** must be installed on your system.  

src/extension.ts

@@ -192,16 +192,28 @@ async function runCppcheckOnFileXML(
         return arg;
     });
 
-    const args = [
-        '--enable=all',
-        '--xml',
-        '--xml-version=2',
-        standardArg,
-        ...extraArgsParsed,
-        filePath.replace(/\\/g, '/')
-    ].filter(Boolean);
-
-    const proc = cp.spawn(commandPath, args);
+    let proc;
+    if (extraArgs.includes("--project")) {
+        const args = [
+            '--enable=all',
+            '--xml',
+            '--xml-version=2',
+            `--file-filter=${filePath.replace(/\\/g, '/')}`,
+            standardArg,
+            ...extraArgsParsed
+        ].filter(Boolean);
+        proc = cp.spawn(commandPath, args);
+    } else {
+        const args = [
+            '--enable=all',
+            '--xml',
+            '--xml-version=2',
+            standardArg,
+            ...extraArgsParsed,
+            filePath.replace(/\\/g, '/')
+        ].filter(Boolean);
+        proc = cp.spawn(commandPath, args);
+    }
 
     // if spawn fails (e.g. ENOENT or permission denied)
     proc.on("error", (err) => {