Logging and post-build commands

* Error logging for exceptions during build cleanup
* Compacted log message filter regexes
* Moved pre-build command after initialization of the output folder in case this command somehow wants to operate on it somehow
* Better error message handling when post-build command fails
* Forwarding post-build command error

src/arduino/arduino.ts

@@ -183,7 +183,9 @@ export class ArduinoApp {
         })
         .catch((reason) => {
             this._building = false;
-            // TODO EW, 2020-02-19: Report unhandled error (Logger?)
+            logger.notifyUserError("ArduinoApp.build",
+                                   reason,
+                                   `Unhandled exception when cleaning up build (${buildMode}).`);
             return false;
         });
     }
@@ -328,13 +330,6 @@ export class ArduinoApp {
         arduinoChannel.show();
         arduinoChannel.start(`${buildMode} sketch '${dc.sketch}'`);
 
-        // TODO EW: What should we do with pre-/post build commands when running
-        //   analysis? Some could use it to generate/manipulate code which could
-        //   be a prerequisite for a successful build
-        if (!await this.runPrePostBuildCommand(dc, "pre")) {
-            return false;
-        }
-
         if ((buildDir || dc.output) && compile) {
             const outputPath = path.resolve(ArduinoWorkspace.rootPath, buildDir || dc.output);
             const dirPath = path.dirname(outputPath);
@@ -356,6 +351,13 @@ export class ArduinoApp {
             arduinoChannel.warning(msg);
         }
 
+        // TODO EW: What should we do with pre-/post build commands when running
+        //   analysis? Some could use it to generate/manipulate code which could
+        //   be a prerequisite for a successful build
+        if (!await this.runPrePostBuildCommand(dc, "pre")) {
+            return false;
+        }
+
         // stop serial monitor when everything is prepared and good
         // what makes restoring of its previous state easier
         if (buildMode === BuildMode.Upload || buildMode === BuildMode.UploadProgrammer) {
@@ -365,10 +367,10 @@ export class ArduinoApp {
 
         // Push sketch as last argument
         args.push(path.join(ArduinoWorkspace.rootPath, dc.sketch));
-
         const cleanup = async (result: "ok" | "error") => {
+            let ret = true;
             if (result === "ok") {
-                await this.runPrePostBuildCommand(dc, "post");
+                ret = await this.runPrePostBuildCommand(dc, "post");
             }
             await cocopa.conclude();
             if (buildMode === BuildMode.Upload || buildMode === BuildMode.UploadProgrammer) {
@@ -377,6 +379,7 @@ export class ArduinoApp {
                     await SerialMonitor.getInstance().openSerialMonitor();
                 }
             }
+            return ret;
         }
         const stdoutcb = (line: string) => {
             if (cocopa.callback) {
@@ -396,17 +399,13 @@ export class ArduinoApp {
                 line = `${line}${os.EOL}`;
             }
             if (!verbose) {
-                // Don't spill log with spurious info from the backend
-                // This list could be fetched from a config file to
-                // accommodate messages of unknown board packages, newer
-                // backend revisions etc.
+                // Don't spill log with spurious info from the backend. This
+                // list could be fetched from a config file to accommodate
+                // messages of unknown board packages, newer backend revisions
                 const filters = [
                     /^Picked\sup\sJAVA_TOOL_OPTIONS:\s+/,
-                    /^\d+\d+-\d+-\d+T\d+:\d+:\d+.\d+Z\sINFO\s/,
-                    /^\d+\d+-\d+-\d+T\d+:\d+:\d+.\d+Z\sWARN\s/,
-                    /^DEBUG\s+/,
-                    /^TRACE\s+/,
-                    /^INFO\s+/,
+                    /^\d+\d+-\d+-\d+T\d+:\d+:\d+.\d+Z\s(?:INFO|WARN)\s/,
+                    /^(?:DEBUG|TRACE|INFO)\s+/,
                 ];
                 for (const f of filters) {
                     if (line.match(f)) {
@@ -423,9 +422,11 @@ export class ArduinoApp {
             undefined,
             { stdout: stdoutcb, stderr: stderrcb },
         ).then(async () => {
-            await cleanup("ok");
-            arduinoChannel.end(`${buildMode} sketch '${dc.sketch}'${os.EOL}`);
-            return true;
+            const ret = await cleanup("ok");
+            if (ret) {
+                arduinoChannel.end(`${buildMode} sketch '${dc.sketch}'${os.EOL}`);
+            }
+            return ret;
         }, async (reason) => {
             await cleanup("error");
             const msg = reason.code