Abstract typical config file loading with path and cli overrides

tools/cmd/diff/main.go

@@ -6,11 +6,61 @@ import (
 	"fmt"
 
 	"kitty/tools/cli"
+	"kitty/tools/config"
+	"kitty/tools/tui/loop"
 )
 
 var _ = fmt.Print
 
-func main(_ *cli.Command, opts *Options, args []string) (rc int, err error) {
+func load_config(opts *Options) (ans *Config, err error) {
+	ans = NewConfig()
+	p := config.ConfigParser{LineHandler: ans.Parse}
+	err = p.LoadConfig("diff.conf", opts.Config, opts.Override)
+	if err != nil {
+		return nil, err
+	}
+	return ans, nil
+}
+
+var conf *Config
+var opts *Options
+var lp *loop.Loop
+
+func main(_ *cli.Command, opts_ *Options, args []string) (rc int, err error) {
+	opts = opts_
+	conf, err = load_config(opts)
+	if err != nil {
+		return 1, err
+	}
+	if len(args) != 2 {
+		return 1, fmt.Errorf("You must specify exactly two files/directories to compare")
+	}
+	left, right := args[0], args[1]
+	lp, err = loop.New()
+	if err != nil {
+		return 1, err
+	}
+	lp.OnInitialize = func() (string, error) {
+		lp.SetCursorVisible(false)
+		lp.AllowLineWrapping(false)
+		lp.SetWindowTitle(fmt.Sprintf("%s vs. %s", left, right))
+		return "", nil
+	}
+	lp.OnFinalize = func() string {
+		lp.SetCursorVisible(true)
+		return ""
+	}
+	err = lp.Run()
+	if err != nil {
+		return 1, err
+	}
+	ds := lp.DeathSignalName()
+	if ds != "" {
+		fmt.Println("Killed by signal: ", ds)
+		lp.KillIfSignalled()
+		return 1, nil
+	}
+
 	return
 }
 

tools/cmd/ssh/config.go

@@ -391,19 +391,9 @@ func (self *ConfigSet) line_handler(key, val string) error {
 func load_config(hostname_to_match string, username_to_match string, overrides []string, paths ...string) (*Config, []config.ConfigLine, error) {
 	ans := &ConfigSet{all_configs: []*Config{NewConfig()}}
 	p := config.ConfigParser{LineHandler: ans.line_handler}
-	if len(paths) == 0 {
-		paths = []string{filepath.Join(utils.ConfigDir(), "ssh.conf")}
-	}
-	paths = utils.Filter(paths, func(x string) bool { return x != "" })
-	err := p.ParseFiles(paths...)
-	if err != nil && !errors.Is(err, fs.ErrNotExist) {
+	err := p.LoadConfig("ssh.conf", paths, overrides)
+	if err != nil {
 		return nil, nil, err
 	}
-	if len(overrides) > 0 {
-		err = p.ParseOverrides(overrides...)
-		if err != nil {
-			return nil, nil, err
-		}
-	}
 	return config_for_hostname(hostname_to_match, username_to_match, ans), p.BadLines(), nil
 }

tools/config/api.go

@@ -168,6 +168,38 @@ func (self *ConfigParser) ParseFiles(paths ...string) error {
 	return nil
 }
 
+func (self *ConfigParser) LoadConfig(name string, paths []string, overrides []string) (err error) {
+	const SYSTEM_CONF = "/etc/xdg/kitty"
+	system_conf := filepath.Join(SYSTEM_CONF, name)
+	add_if_exists := func(q string) {
+		err = self.ParseFiles(q)
+		if err != nil && errors.Is(err, fs.ErrNotExist) {
+			err = nil
+		}
+	}
+	if add_if_exists(system_conf); err != nil {
+		return err
+	}
+	if len(paths) > 0 {
+		for _, path := range paths {
+			if add_if_exists(path); err != nil {
+				return err
+			}
+		}
+	} else {
+		if add_if_exists(filepath.Join(utils.ConfigDirForName(name), name)); err != nil {
+			return err
+		}
+	}
+	if len(overrides) > 0 {
+		err = self.ParseOverrides(overrides...)
+		if err != nil {
+			return err
+		}
+	}
+	return
+}
+
 type LinesScanner struct {
 	lines []string
 }

tools/utils/paths.go

@@ -73,7 +73,7 @@ var KittyExe = (&Once[string]{Run: func() string {
 	return os.Getenv("KITTY_PATH_TO_KITTY_EXE")
 }}).Get
 
-var ConfigDir = (&Once[string]{Run: func() (config_dir string) {
+func ConfigDirForName(name string) (config_dir string) {
 	if kcd := os.Getenv("KITTY_CONFIG_DIRECTORY"); kcd != "" {
 		return Abspath(Expanduser(kcd))
 	}
@@ -101,7 +101,7 @@ var ConfigDir = (&Once[string]{Run: func() (config_dir string) {
 	for _, loc := range locations {
 		if loc != "" {
 			q := filepath.Join(loc, "kitty")
-			if _, err := os.Stat(filepath.Join(q, "kitty.conf")); err == nil {
+			if _, err := os.Stat(filepath.Join(q, name)); err == nil {
 				config_dir = q
 				return
 			}
@@ -113,6 +113,10 @@ var ConfigDir = (&Once[string]{Run: func() (config_dir string) {
 	}
 	config_dir = filepath.Join(Expanduser(config_dir), "kitty")
 	return
+}
+
+var ConfigDir = (&Once[string]{Run: func() (config_dir string) {
+	return ConfigDirForName("kitty.conf")
 }}).Get
 
 var CacheDir = (&Once[string]{Run: func() (cache_dir string) {