feat: jjui --config opens config file in editor

cmd/jjui/main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"github.com/idursun/jjui/internal/config"
 	"github.com/idursun/jjui/internal/ui/context"
 	"os"
 
@@ -12,9 +13,15 @@ import (
 var Version = "unknown"
 
 func main() {
-	if len(os.Args) > 1 && os.Args[1] == "--version" {
-		fmt.Printf("jjui version %s\n", Version)
-		os.Exit(0)
+	if len(os.Args) > 1 {
+		switch os.Args[1] {
+		case "--version":
+			fmt.Printf("jjui version %s\n", Version)
+			os.Exit(0)
+		case "--config":
+			exitCode := config.Edit()
+			os.Exit(exitCode)
+		}
 	}
 	location := os.Getenv("PWD")
 	if len(os.Args) > 1 {

internal/config/config.go

@@ -2,37 +2,90 @@ package config
 
 import (
 	"github.com/BurntSushi/toml"
+	"log"
 	"os"
+	"os/exec"
+	"path"
 	"path/filepath"
 )
 
 type Config struct {
 	Keys KeyMappings[keys] `toml:"keys"`
 }
 
-func findConfig() (string, error) {
+func getConfigFilePath() string {
 	configDir, err := os.UserConfigDir()
 	if err != nil {
-		return "", err
+		return ""
 	}
-	configPath := filepath.Join(configDir, "jjui", "config.toml")
+	return filepath.Join(configDir, "jjui", "config.toml")
+}
 
-	_, err = os.Stat(configPath)
-	if err != nil {
-		return "", err
+func getDefaultEditor() string {
+	editor := os.Getenv("EDITOR")
+	if editor == "" {
+		editor = os.Getenv("VISUAL")
+	}
+
+	// Fallback to common editors if not set
+	if editor == "" {
+		candidates := []string{"nano", "vim", "vi", "notepad.exe"} // Windows fallback
+		for _, candidate := range candidates {
+			if p, err := exec.LookPath(candidate); err == nil {
+				editor = p
+				break
+			}
+		}
 	}
-	return configPath, nil
+
+	return editor
 }
 
 func Load() Config {
 	defaultConfig := Config{Keys: DefaultKeyMappings}
-	configFile, err := findConfig()
+	configFile := getConfigFilePath()
+	_, err := os.Stat(configFile)
 	if err != nil {
 		return defaultConfig
 	}
 	_, err = toml.DecodeFile(configFile, &defaultConfig)
 	if err != nil {
+		Current = &defaultConfig
 		return defaultConfig
 	}
 	return defaultConfig
 }
+
+func Edit() int {
+	configFile := getConfigFilePath()
+	_, err := os.Stat(configFile)
+	if os.IsNotExist(err) {
+		configPath := path.Dir(configFile)
+		if _, err := os.Stat(configPath); os.IsNotExist(err) {
+			err = os.MkdirAll(configPath, 0755)
+			if err != nil {
+				log.Fatal(err)
+				return -1
+			}
+		}
+		if _, err := os.Stat(configFile); os.IsNotExist(err) {
+			_, err := os.Create(configFile)
+			if err != nil {
+				log.Fatal(err)
+				return -1
+			}
+		}
+	}
+
+	editor := getDefaultEditor()
+	if editor == "" {
+		log.Fatal("No editor found. Please set $EDITOR or $VISUAL")
+	}
+
+	cmd := exec.Command(editor, configFile)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Run()
+	return cmd.ProcessState.ExitCode()
+}