Allow passing custom settings (#60)

README.md

@@ -47,7 +47,6 @@ go install
 smug <command> [<project>] [-f, --file <file>] [-w, --windows <window>]... [-a, --attach] [-d, --debug]
 ```
 
-
 ### Options:
 
 ```
@@ -58,6 +57,14 @@ smug <command> [<project>] [-f, --file <file>] [-w, --windows <window>]... [-a,
 --detach Detach session. The same as `-d` flag in the tmux
 ```
 
+### Custom settings
+
+You can pass custom settings into your configuration file. Use `${variable_name}` syntax in your config and then pass key-value args:
+
+```
+smug start project variable_name=value
+```
+
 ### Examples
 
 To create a new project, or edit an existing one in the `$EDITOR`:
@@ -110,7 +117,6 @@ Configuration files stored in the `~/.config/smug` directory in the `YAML` forma
 
 #### Example 1
 
-
 ```yaml
 session: blog
 
@@ -147,6 +153,7 @@ windows:
           - docker-compose exec php /bin/sh
           - clear
 ```
+
 #### Example 2
 
 ```yaml

config.go

@@ -49,13 +49,22 @@ func EditConfig(path string) error {
 	return cmd.Run()
 }
 
-func GetConfig(path string) (Config, error) {
+func GetConfig(path string, settings map[string]string) (Config, error) {
 	f, err := ioutil.ReadFile(path)
 	if err != nil {
 		return Config{}, err
 	}
 
-	return ParseConfig(string(f))
+	config := string(f)
+	config = os.Expand(config, func(v string) string {
+		if val, ok := settings[v]; ok {
+			return val
+		}
+
+		return v
+	})
+
+	return ParseConfig(config)
 }
 
 func ParseConfig(data string) (Config, error) {

main.go

@@ -16,7 +16,7 @@ var usage = fmt.Sprintf(`Smug - tmux session manager. Version %s
 
 
 Usage:
-	smug <command> [<project>] [-f, --file <file>] [-w, --windows <window>]... [-a, --attach] [-d, --debug]
+	smug <command> [<project>] [-f, --file <file>] [-w, --windows <window>]... [-a, --attach] [-d, --debug] [<key>=<value>]...
 
 Options:
 	-f, --file %s
@@ -90,7 +90,7 @@ func main() {
 		} else {
 			fmt.Println("Starting new windows...")
 		}
-		config, err := GetConfig(configPath)
+		config, err := GetConfig(configPath, options.Settings)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, err.Error())
 			os.Exit(1)
@@ -108,7 +108,7 @@ func main() {
 		} else {
 			fmt.Println("Killing windows...")
 		}
-		config, err := GetConfig(configPath)
+		config, err := GetConfig(configPath, options.Settings)
 		if err != nil {
 			fmt.Fprintf(os.Stderr, err.Error())
 			os.Exit(1)

options.go

@@ -19,13 +19,14 @@ const (
 var validCommands = []string{CommandStart, CommandStop, CommandNew, CommandEdit, CommandList, CommandPrint}
 
 type Options struct {
-	Command string
+	Command  string
-	Project string
+	Project  string
-	Config  string
+	Config   string
-	Windows []string
+	Windows  []string
-	Attach  bool
+	Settings map[string]string
-	Detach  bool
+	Attach   bool
-	Debug   bool
+	Detach   bool
+	Debug    bool
 }
 
 var ErrHelp = errors.New("help requested")
@@ -71,6 +72,7 @@ func ParseOptions(argv []string, helpRequested func()) (Options, error) {
 	debug := flags.BoolP("debug", "d", false, DebugUsage)
 
 	err := flags.Parse(argv)
+
 	if err == pflag.ErrHelp {
 		return Options{}, ErrHelp
 	}
@@ -91,13 +93,26 @@ func ParseOptions(argv []string, helpRequested func()) (Options, error) {
 		windows = &wl
 	}
 
+	settings := make(map[string]string)
+	userSettings := flags.Args()[1:]
+	if len(userSettings) > 0 {
+		for _, kv := range userSettings {
+			s := strings.Split(kv, "=")
+			if len(s) < 2 {
+				continue
+			}
+			settings[s[0]] = s[1]
+		}
+	}
+
 	return Options{
-		Project: project,
+		Project:  project,
-		Config:  *config,
+		Config:   *config,
-		Command: cmd,
+		Command:  cmd,
-		Windows: *windows,
+		Settings: settings,
-		Attach:  *attach,
+		Windows:  *windows,
-		Detach:  *detach,
+		Attach:   *attach,
-		Debug:   *debug,
+		Detach:   *detach,
+		Debug:    *debug,
 	}, nil
 }

options_test.go

@@ -17,13 +17,14 @@ var usageTestTable = []struct {
 	{
 		[]string{"start", "smug"},
 		Options{
-			Command: "start",
+			Command:  "start",
-			Project: "smug",
+			Project:  "smug",
-			Config:  "",
+			Config:   "",
-			Windows: []string{},
+			Windows:  []string{},
-			Attach:  false,
+			Attach:   false,
-			Detach:  false,
+			Detach:   false,
-			Debug:   false,
+			Debug:    false,
+			Settings: map[string]string{},
 		},
 		nil,
 		0,
@@ -31,13 +32,14 @@ var usageTestTable = []struct {
 	{
 		[]string{"start", "smug", "-w", "foo"},
 		Options{
-			Command: "start",
+			Command:  "start",
-			Project: "smug",
+			Project:  "smug",
-			Config:  "",
+			Config:   "",
-			Windows: []string{"foo"},
+			Windows:  []string{"foo"},
-			Attach:  false,
+			Attach:   false,
-			Detach:  false,
+			Detach:   false,
-			Debug:   false,
+			Debug:    false,
+			Settings: map[string]string{},
 		},
 		nil,
 		0,
@@ -45,13 +47,14 @@ var usageTestTable = []struct {
 	{
 		[]string{"start", "smug:foo,bar"},
 		Options{
-			Command: "start",
+			Command:  "start",
-			Project: "smug",
+			Project:  "smug",
-			Config:  "",
+			Config:   "",
-			Windows: []string{"foo", "bar"},
+			Windows:  []string{"foo", "bar"},
-			Attach:  false,
+			Attach:   false,
-			Detach:  false,
+			Detach:   false,
-			Debug:   false,
+			Debug:    false,
+			Settings: map[string]string{},
 		},
 		nil,
 		0,
@@ -59,33 +62,83 @@ var usageTestTable = []struct {
 	{
 		[]string{"start", "smug", "--attach", "--debug", "--detach"},
 		Options{
-			Command: "start",
+			Command:  "start",
-			Project: "smug",
+			Project:  "smug",
-			Config:  "",
+			Config:   "",
-			Windows: []string{},
+			Windows:  []string{},
-			Attach:  true,
+			Attach:   true,
-			Detach:  true,
+			Detach:   true,
-			Debug:   true,
+			Debug:    true,
+			Settings: map[string]string{},
 		},
 		nil,
 		0,
 	},
 	{
 		[]string{"start", "smug", "-ad"},
+		Options{
+			Command:  "start",
+			Project:  "smug",
+			Config:   "",
+			Windows:  []string{},
+			Attach:   true,
+			Detach:   false,
+			Debug:    true,
+			Settings: map[string]string{},
+		},
+		nil,
+		0,
+	},
+	{
+		[]string{"start", "-f", "test.yml"},
+		Options{
+			Command:  "start",
+			Project:  "",
+			Config:   "test.yml",
+			Windows:  []string{},
+			Attach:   false,
+			Detach:   false,
+			Debug:    false,
+			Settings: map[string]string{},
+		},
+		nil,
+		0,
+	},
+	{
+		[]string{"start", "-f", "test.yml", "-w", "win1", "-w", "win2"},
+		Options{
+			Command:  "start",
+			Project:  "",
+			Config:   "test.yml",
+			Windows:  []string{"win1", "win2"},
+			Attach:   false,
+			Detach:   false,
+			Debug:    false,
+			Settings: map[string]string{},
+		},
+		nil,
+		0,
+	},
+	{
+		[]string{"start", "project", "a=b", "x=y"},
 		Options{
 			Command: "start",
-			Project: "smug",
+			Project: "project",
 			Config:  "",
 			Windows: []string{},
-			Attach:  true,
+			Attach:  false,
 			Detach:  false,
-			Debug:   true,
+			Debug:   false,
+			Settings: map[string]string{
+				"a": "b",
+				"x": "y",
+			},
 		},
 		nil,
 		0,
 	},
 	{
-		[]string{"start", "-f", "test.yml"},
+		[]string{"start", "-f", "test.yml", "a=b", "x=y"},
 		Options{
 			Command: "start",
 			Project: "",
@@ -94,12 +147,16 @@ var usageTestTable = []struct {
 			Attach:  false,
 			Detach:  false,
 			Debug:   false,
+			Settings: map[string]string{
+				"a": "b",
+				"x": "y",
+			},
 		},
 		nil,
 		0,
 	},
 	{
-		[]string{"start", "-f", "test.yml", "-w", "win1", "-w", "win2"},
+		[]string{"start", "-f", "test.yml", "-w", "win1", "-w", "win2", "a=b", "x=y"},
 		Options{
 			Command: "start",
 			Project: "",
@@ -108,6 +165,10 @@ var usageTestTable = []struct {
 			Attach:  false,
 			Detach:  false,
 			Debug:   false,
+			Settings: map[string]string{
+				"a": "b",
+				"x": "y",
+			},
 		},
 		nil,
 		0,