Fix settable run command

README.md

@@ -34,6 +34,7 @@ Here is a sample config file with the default settings:
 
     root:              .
     tmp_path:          ./tmp
+    build_command:     go
     build_name:        runner-build
     build_log:         runner-build-errors.log
     valid_ext:         .go, .tpl, .tmpl, .html

runner.conf.sample

@@ -1,5 +1,6 @@
 root:              .
 tmp_path:          ./tmp
+build_command:     go
 build_name:        runner-build
 build_log:         runner-build-errors.log
 valid_ext:         .go, .tpl, .tmpl, .html

runner/build.go

@@ -10,7 +10,7 @@ import (
 func build() (string, bool) {
 	buildLog("Building...")
 
-	cmd := exec.Command("go", "build", "-o", buildPath(), root())
+	cmd := exec.Command(buildCommand(), "build", "-o", buildPath(), root())
 
 	stderr, err := cmd.StderrPipe()
 	if err != nil {

runner/settings.go

@@ -20,6 +20,7 @@ var settings = map[string]string{
 	"config_path":       "./runner.conf",
 	"root":              ".",
 	"tmp_path":          "./tmp",
+	"build_command":     "go",
 	"build_name":        "runner-build",
 	"build_log":         "runner-build-errors.log",
 	"valid_ext":         ".go, .tpl, .tmpl, .html",
@@ -68,7 +69,7 @@ func logColor(logName string) string {
 }
 
 func loadEnvSettings() {
-	for key, _ := range settings {
+	for key := range settings {
 		envKey := fmt.Sprintf("%s%s", envSettingsPrefix, strings.ToUpper(key))
 		if value := os.Getenv(envKey); value != "" {
 			settings[key] = value
@@ -113,9 +114,14 @@ func tmpPath() string {
 	return settings["tmp_path"]
 }
 
+func buildCommand() string {
+	return settings["build_command"]
+}
+
 func buildName() string {
 	return settings["build_name"]
 }
+
 func buildPath() string {
 	p := filepath.Join(tmpPath(), buildName())
 	if runtime.GOOS == "windows" && filepath.Ext(p) != ".exe" {