Add --argument-passthrough option

README.md

@@ -80,6 +80,7 @@ Options:
 
   -r, --raw                        output only raw output of processes, disables prettifying and concurrently coloring
   -s, --success <first|last|all>   Return exit code of zero or one based on the success or failure of the "first" child to terminate, the "last" child, or succeed  only if "all" child processes succeed. Default: all
+  --argument-passthrough           pass arguments separated by `--` to each command
 
   -l, --prefix-length <length>     limit how many characters of the command is displayed in prefix.
   The option can be used to shorten long commands.

src/main.js

@@ -45,7 +45,10 @@ var config = {
     color: true,
 
     // If true, the output will only be raw output of processes, nothing more
-    raw: false
+    raw: false,
+
+    // If true, the arguments separated by `--` will be added to each command
+    argumentPassthrough: false
 };
 
 function main() {
@@ -57,7 +60,23 @@ function main() {
 
     parseArgs();
     config = mergeDefaultsWithArgs(config);
-    run(program.args);
+    var commands = program.args.filter(function(arg) {
+        return arg[0] !== '-';
+    });
+
+    var passthroughArguments = getArgsAfterDoubleDash();
+
+    var passthroughArgumentString = '';
+    var shouldAddPassThroughArguments = config.argumentPassthrough && passthroughArguments.length > 0;
+    if(shouldAddPassThroughArguments) {
+        passthroughArgumentString = ' ' + passthroughArguments.join(' ');
+    }
+
+    compiledCommands = commands.map(function(command) {
+        return command + passthroughArgumentString;
+    });
+
+    run(compiledCommands);
 }
 
 function parseArgs() {
@@ -108,6 +127,10 @@ function parseArgs() {
             'output only raw output of processes,' +
             ' disables prettifying and concurrently coloring'
         )
+        .option(
+            '--argument-passthrough',
+            'pass arguments separated by `--` to each command'
+        )
         .option(
             '-s, --success <first|last|all>',
             'Return exit code of zero or one based on the success or failure ' +
@@ -374,6 +397,19 @@ function shortenText(text, length, cut) {
     return first + cut + last;
 }
 
+function getArgsAfterDoubleDash() {
+    var foundDoubleDash = false;
+    var passthroughArguments = [];
+    process.argv.some(function(piece, index) {
+        if(piece === '--') {
+            passthroughArguments = process.argv.slice(index + 1);
+            // break
+            return true;
+        }
+    });
+    return passthroughArguments;
+}
+
 function log(prefix, prefixColor, text) {
     logWithPrefix(prefix, prefixColor, text);
 }

test/test-functional.js

@@ -83,6 +83,14 @@ describe('concurrently', function() {
             });
     });
 
+    it('--argument-passthrough should pass arguments to each command', () => {
+        // TODO: How can we test this?
+        return run('node ./src/main.js --argument-passthrough "echo test1" "echo test2" -- --foo', {pipe: DEBUG_TESTS})
+            .then(function(exitCode) {
+                assert.strictEqual(exitCode, 0);
+            });
+    });
+
     ['SIGINT', 'SIGTERM'].forEach((signal) => {
       if (IS_WINDOWS) {
           console.log('IS_WINDOWS=true');