Add toggle-nightlight command

main.go

@@ -10,6 +10,7 @@ import (
 	"os/exec"
 	"os/user"
 	"strconv"
+	"strings"
 	"syscall"
 )
 
@@ -19,6 +20,8 @@ COMMANDS
 
 dump-init-files: Dump emacs/bash init files to home directory, overwriting existing files.
                  List of files: ~/.bash_aliases, ~/.emacs, ~/.custom.el
+
+toggle-nightlight: Toggle Gnome display nightlight feature.
 `
 
 //go:embed emacs/init.el
@@ -248,7 +251,7 @@ func SetEnvVars() {
 	// GO Stuff
 	os.Setenv("GOPATH", home+"/go")
 	os.Setenv("PATH", home+"/go/bin:"+os.Getenv("PATH"))
-	os.Setenv("PATH", "/usr/local/go/bin:"+os.Getenv("PATH"))	
+	os.Setenv("PATH", "/usr/local/go/bin:"+os.Getenv("PATH"))
 	os.Setenv("PATH", "/usr/local/gopkg/bin:"+os.Getenv("PATH"))
 	os.Setenv("GOPRIVATE", "git.snorba.art")
 }
@@ -268,6 +271,76 @@ func DumpStringToFile(data string, path string) error {
 	return writer.Flush()
 }
 
+func ToggleNightLight() error {
+	getState := exec.Command(
+		"gsettings",
+		"get",
+		"org.gnome.settings-daemon.plugins.color",
+		"night-light-enabled",
+	)
+	state, err := getState.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("%w: %s", err, state)
+	}
+
+	stateStr := strings.TrimSpace(string(state))
+
+	desiredState := "true"
+	if stateStr == desiredState {
+		desiredState = "false"
+	}
+
+	out, err := exec.Command(
+		"gsettings",
+		"set",
+		"org.gnome.settings-daemon.plugins.color",
+		"night-light-enabled",
+		desiredState,
+	).CombinedOutput()
+
+	if err != nil {
+		return fmt.Errorf("%w: %s", err, out)
+	}
+
+	return nil
+}
+
+func DumpInitFiles() error {
+	home := os.Getenv("HOME")
+	elispThemeDir := home + "/.workspace/elisp-themes"
+
+	if _, err := os.Stat(elispThemeDir); os.IsNotExist(err) {
+		err = os.MkdirAll(elispThemeDir, 0755)
+		if err != nil {
+			return fmt.Errorf(
+				"Failed to create elisp theme dir in %v: %w",
+				elispThemeDir,
+				err,
+			)
+		}
+
+	}
+
+	files := map[string]string{
+		home + "/.emacs":                   initLisp,
+		home + "/.custom.el":               customLisp,
+		home + "/.bash_aliases":            bashAliases,
+		elispThemeDir + "/epaper-theme.el": elispEpaperTheme,
+		home + "/.gitconfig":               gitConfig,
+		home + "/.gitignore":               gitIgnore,
+	}
+
+	for file, contents := range files {
+		fmt.Fprintln(os.Stderr, "Dumping to "+file)
+		err := DumpStringToFile(contents, file)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 func main() {
 	var cmd string
 	if len(os.Args) > 1 {
@@ -307,37 +380,16 @@ func main() {
 			os.Exit(1)
 		}
 	case "dump-init-files":
-		home := os.Getenv("HOME")
-		elispThemeDir := home + "/.workspace/elisp-themes"
-
-		if _, err := os.Stat(elispThemeDir); os.IsNotExist(err) {
-			err = os.MkdirAll(elispThemeDir, 0755)
-			if err != nil {
-				fmt.Fprintln(
-					os.Stderr,
-					"Failed to create elisp theme dir in"+elispThemeDir,
-				)
-				os.Exit(1)
-			}
-
-		}
-
-		files := map[string]string{
-			home + "/.emacs":                   initLisp,
-			home + "/.custom.el":               customLisp,
-			home + "/.bash_aliases":            bashAliases,
-			elispThemeDir + "/epaper-theme.el": elispEpaperTheme,
-			home + "/.gitconfig":               gitConfig,
-			home + "/.gitignore":               gitIgnore,
+		err := DumpInitFiles()
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
 		}
-
-		for file, contents := range files {
-			fmt.Fprintln(os.Stderr, "Dumping to "+file)
-			err := DumpStringToFile(contents, file)
-			if err != nil {
-				fmt.Fprintln(os.Stderr, err)
-				os.Exit(1)
-			}
+	case "toggle-nightlight":
+		err := ToggleNightLight()
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
 		}
 	default:
 		fmt.Println(usage)