Add default config for gmux.

Signed-off-by: corvofeng <corvofeng@gmail.com>

cmd/gmux/internal/command/root.go

@@ -50,6 +50,43 @@ func parseKeyValue(arg string) []string {
 	return nil
 }
 
+// inject the variables
+func (c *rootCmd) ParseConfig(varMap map[string]string, configPath string) (lib.Config, error) {
+	content, err := os.ReadFile(configPath)
+	if err != nil {
+		c.Logger.Errorf("Error reading config file: %s %s", configPath, err)
+		return lib.Config{}, err
+	}
+	projContent := string(content)
+	projContent = lib.RenderERB(projContent, varMap)
+	config, err := lib.ParseConfig(projContent)
+	if err != nil {
+		c.Logger.Errorf("Error parsing config file: %s %s", configPath, err)
+		return lib.Config{}, err
+	}
+
+	return config, nil
+}
+func CreateDefaultConfig() lib.Config {
+	config := lib.Config{
+		Name: "gmux-default",
+		Tmux: "tmux -L gmux-default",
+		Root: "~/",
+		Windows: []lib.Window{
+			{
+				Name: "default",
+				Root: "~/",
+				Panes: []lib.Pane{
+					{
+						Commands: []string{"ls"},
+					},
+				},
+			},
+		},
+	}
+	return config
+}
+
 func (c *rootCmd) Run(cmd *cobra.Command, args []string) error {
 	varMap := make(map[string]string)
 	for _, set := range flagSets {
@@ -62,21 +99,18 @@ func (c *rootCmd) Run(cmd *cobra.Command, args []string) error {
 	}
 
 	configPath := lib.ParseConfigPath(flagDirectory, flagProject)
-	content, err := os.ReadFile(configPath)
-	if err != nil {
-		c.Logger.Errorf("Error reading config file: %s %s", configPath, err)
-		return err
-	}
-	projContent := string(content)
+	var config lib.Config
 
-	if len(varMap) > 0 {
-		projContent = lib.RenderERB(projContent, varMap)
-	}
-	config, err := lib.ParseConfig(projContent)
-	if err != nil {
-		c.Logger.Errorf("Error parsing config file: %s %s", configPath, err)
-		return err
+	if _, err := os.Stat(configPath); os.IsNotExist(err) {
+		c.Logger.Warn("Although the gmux works without a config file, it is recommended to create one.")
+		config = CreateDefaultConfig()
+	} else {
+		if config, err = c.ParseConfig(varMap, configPath); err != nil {
+			c.Logger.Errorf("Parse config error: %s", err)
+			return err
+		}
 	}
+
 	config.TmuxArgs = args
 	config.Debug = flagDebug
 

lib/tmux.go

@@ -2,6 +2,7 @@ package lib
 
 import (
 	"bytes"
+	"fmt"
 	"gmux/lib/asset"
 	"os"
 	"os/exec"
@@ -65,6 +66,25 @@ func shellescape(str string) string {
 	return str
 }
 
+/*
+*
+  - ConfigCheck for tmux config
+    We have such script template:
+    {{$.Tmux}} split-window -c {{$window.Root}} -t {{$.Name}}:{{$winId}}
+    We can't predict the program behavior if $window.Root is empty.
+*/
+func ConfigCheck(config *Config) error {
+	if config.Root == "" {
+		return fmt.Errorf("tmux Root is required")
+	}
+	for _, window := range config.Windows {
+		if window.Root == "" {
+			return fmt.Errorf("window root for %s is required", window.Name)
+		}
+	}
+	return nil
+}
+
 func RunTmux(log log.FieldLogger, config *Config) {
 	funcMap := template.FuncMap{
 		"TmuxHasSession": TmuxHasSession,
@@ -74,6 +94,10 @@ func RunTmux(log log.FieldLogger, config *Config) {
 			return i + 1
 		},
 	}
+	if err := ConfigCheck(config); err != nil {
+		log.Error(err)
+		return
+	}
 
 	// 创建一个新模板并解析模板字符串
 	tmpl, err := template.New("bashScript").