Add option to clean output before running configure/build (Enhancement #6)

package.json

@@ -96,6 +96,11 @@
                     "default": "${workspaceRoot}/build",
                     "description": "The directory where CMake build files will go"
                 },
+                "cmake.clearOutputBeforeBuild": {
+                    "type": "boolean",
+                    "default": true,
+                    "description": "Clear build output before each build"
+                },
                 "cmake.configureSettings": {
                     "type": "object",
                     "default": {

src/cmake.ts

@@ -487,7 +487,15 @@ export class CMakeTools {
         return null;
     }
 
-    public configure = async function (extra_args: string[] = []): Promise<Number> {
+    private _prebuild = async function () {
+        const self: CMakeTools = this;
+        if (self.config<boolean>("clearOutputBeforeBuild")) {
+            self._channel.clear();
+        }
+
+    }
+
+    public configure = async function (extra_args: string[] = [], run_prebuild = true): Promise<Number> {
         const self: CMakeTools = this;
 
         if (self.isBusy) {
@@ -513,6 +521,9 @@ export class CMakeTools {
             return;
         }
 
+        if (run_prebuild)
+            await self._prebuild();
+
         const binary_dir = self.binaryDir;
         const cmake_cache = self.cachePath;
         self._channel.show();
@@ -575,8 +586,9 @@ export class CMakeTools {
             if (!do_configure || await self.configure() !== 0)
                 return -1;
         }
+        await self._prebuild();
         if (self._needsReconfigure) {
-            const retc = await self.configure();
+            const retc = await self.configure([], false);
             if (!!retc)
                 return retc;
         }