Implement temporary "init" functionality

src/offline/init.go

@@ -0,0 +1,39 @@
+package offline
+
+import (
+	"fmt"
+	"os"
+)
+
+func TempInit(configFileMap map[string]string) {
+	// create EntryRoot and ConfigDir
+	dirInit()
+
+	// remove existing config file
+	err := os.Remove(ConfigPath)
+	if err != nil {
+		// ignore error if file does not exist
+		if !os.IsNotExist(err) {
+			fmt.Println(AnsiError + "Failed to remove existing libmutton.ini:" + err.Error() + AnsiReset)
+		}
+	}
+
+	// ensure textEditor is set
+	if configFileMap["textEditor"] == "" {
+		textEditor := os.Getenv("EDITOR")
+		if textEditor == "" {
+			textEditor = fallbackEditor
+		}
+		configFileMap["textEditor"] = textEditor
+	}
+
+	// create and write config file
+	configFile, _ := os.OpenFile(ConfigPath, os.O_CREATE|os.O_WRONLY, 0600)
+	defer configFile.Close()
+	configFile.WriteString("[LIBMUTTON]\n")
+	for key, value := range configFileMap {
+		configFile.WriteString(key + " = " + value + "\n")
+	}
+
+	os.Exit(0)
+}