Fix issue with postprocessing files twice. Fixes #158

app.js

@@ -167,7 +167,6 @@ function ClientOptionsHandler(fileSources) {
             defaultCompiler: compilerProps('defaultCompiler', ''),
             compileOptions: compilerProps("options"),
             supportsBinary: !!compilerProps("supportsBinary"),
-            postProcess: compilerProps("postProcess"),
             sources: sources,
             raven: gccProps('ravenUrl', ''),
             release: gitReleaseName,
@@ -342,7 +341,7 @@ function configuredCompilers() {
             outputFlag: props("outputFlag", "-o"),
             needsMulti: !!props("needsMulti", true),
             supportsBinary: !!props("supportsBinary", true),
-            postProcess: props("postProcess", "")
+            postProcess: props("postProcess", "").split("|")
         });
     })).then(_.flatten);
 }
@@ -356,15 +355,18 @@ function getCompilerInfo(compilerInfo) {
         var compiler = compilerInfo.exe;
         var versionFlag = compilerInfo.versionFlag || '--version';
         // fill field compilerInfo.version,
-        // assuming the compiler returns it's version on 1 line
+        // assuming the compiler returns its version on 1 line
         child_process.exec('"' + compiler + '" ' + versionFlag, function (err, output) {
-            if (err) return resolve(null);
+            if (err) {
+                console.log("Unable to run compiler '" + compiler + "' : " + err);
+                return resolve(null);
+            }
             compilerInfo.version = output.split('\n')[0];
             if (compilerInfo.intelAsm) {
                 return resolve(compilerInfo);
             }
 
-            // get informations on the compiler's options
+            // get information on the compiler's options
             child_process.exec(compiler + ' --target-help', function (err, output) {
                 var options = {};
                 if (!err) {

lib/compile.js

@@ -264,8 +264,7 @@ Compile.prototype.compile = function (source, compiler, options, filters) {
     var compileToAsmPromise = tempFileAndDirPromise.then(function (info) {
         var inputFilename = info.inputFilename;
         var dirPath = info.dirPath;
-        var postProcess = [compilerProps("postProcess"), compilerInfo.postProcess];
-        postProcess = postProcess.filter(function (x) {
+        var postProcess = compilerInfo.postProcess.filter(function (x) {
             return x;
         });
         var outputFilename = path.join(dirPath, 'output.s'); // NB keep lower case as ldc compiler `tolower`s the output name
@@ -319,7 +318,8 @@ Compile.prototype.compile = function (source, compiler, options, filters) {
                 }
                 if (postProcess.length) {
                     return new Promise(function (resolve) {
-                        child_process.exec('cat "' + outputFilename + '" | ' + postProcess.join(" | "),
+                        var postCommand = 'cat "' + outputFilename + '" | ' + postProcess.join(" | ");
+                        child_process.exec(postCommand,
                             {maxBuffer: maxSize},
                             function (err, data) {
                                 if (err)