theme: add matugen contrast slider

fixes #2026

core/cmd/dms/commands_matugen.go

@@ -57,6 +57,7 @@ func init() {
 		cmd.Flags().Bool("sync-mode-with-portal", false, "Sync color scheme with GNOME portal")
 		cmd.Flags().Bool("terminals-always-dark", false, "Force terminal themes to dark variant")
 		cmd.Flags().String("skip-templates", "", "Comma-separated list of templates to skip")
+		cmd.Flags().Float64("contrast", 0, "Contrast value from -1 to 1 (0 = standard)")
 	}
 
 	matugenQueueCmd.Flags().Bool("wait", true, "Wait for completion")
@@ -77,6 +78,7 @@ func buildMatugenOptions(cmd *cobra.Command) matugen.Options {
 	syncModeWithPortal, _ := cmd.Flags().GetBool("sync-mode-with-portal")
 	terminalsAlwaysDark, _ := cmd.Flags().GetBool("terminals-always-dark")
 	skipTemplates, _ := cmd.Flags().GetString("skip-templates")
+	contrast, _ := cmd.Flags().GetFloat64("contrast")
 
 	return matugen.Options{
 		StateDir:            stateDir,
@@ -87,6 +89,7 @@ func buildMatugenOptions(cmd *cobra.Command) matugen.Options {
 		Mode:                matugen.ColorMode(mode),
 		IconTheme:           iconTheme,
 		MatugenType:         matugenType,
+		Contrast:            contrast,
 		RunUserTemplates:    runUserTemplates,
 		StockColors:         stockColors,
 		SyncModeWithPortal:  syncModeWithPortal,
@@ -128,6 +131,7 @@ func runMatugenQueue(cmd *cobra.Command, args []string) {
 			"syncModeWithPortal":  opts.SyncModeWithPortal,
 			"terminalsAlwaysDark": opts.TerminalsAlwaysDark,
 			"skipTemplates":       opts.SkipTemplates,
+			"contrast":            opts.Contrast,
 			"wait":                wait,
 		},
 	}

core/internal/matugen/matugen.go

@@ -99,6 +99,7 @@ type Options struct {
 	Mode                ColorMode
 	IconTheme           string
 	MatugenType         string
+	Contrast            float64
 	RunUserTemplates    bool
 	ColorsOnly          bool
 	StockColors         string
@@ -228,6 +229,7 @@ func buildOnce(opts *Options) (bool, error) {
 
 		log.Info("Running matugen color hex with stock color overrides")
 		args := []string{"color", "hex", primaryDark, "-m", string(opts.Mode), "-t", opts.MatugenType, "-c", cfgFile.Name()}
+		args = appendContrastArg(args, opts.Contrast)
 		args = append(args, importArgs...)
 		if err := runMatugen(args); err != nil {
 			return false, err
@@ -264,6 +266,7 @@ func buildOnce(opts *Options) (bool, error) {
 			args = []string{opts.Kind, opts.Value}
 		}
 		args = append(args, "-m", string(opts.Mode), "-t", opts.MatugenType, "-c", cfgFile.Name())
+		args = appendContrastArg(args, opts.Contrast)
 		args = append(args, importArgs...)
 		if err := runMatugen(args); err != nil {
 			return false, err
@@ -299,6 +302,13 @@ func buildOnce(opts *Options) (bool, error) {
 	return true, nil
 }
 
+func appendContrastArg(args []string, contrast float64) []string {
+	if contrast == 0 {
+		return args
+	}
+	return append(args, "--contrast", strconv.FormatFloat(contrast, 'f', -1, 64))
+}
+
 func buildMergedConfig(opts *Options, cfgFile *os.File, tmpDir string) error {
 	userConfigPath := filepath.Join(opts.ConfigDir, "matugen", "config.toml")
 
@@ -687,6 +697,7 @@ func execDryRun(opts *Options, flags matugenFlags) (string, error) {
 		baseArgs = []string{opts.Kind, opts.Value}
 	}
 	baseArgs = append(baseArgs, "-m", "dark", "-t", opts.MatugenType, "--json", "hex", "--dry-run")
+	baseArgs = appendContrastArg(baseArgs, opts.Contrast)
 	if flags.isV4 {
 		baseArgs = append(baseArgs, "--source-color-index", "0", "--old-json-output")
 	}

core/internal/server/matugen_handler.go

@@ -29,6 +29,7 @@ func handleMatugenQueue(conn net.Conn, req models.Request) {
 		SyncModeWithPortal:  models.GetOr(req, "syncModeWithPortal", false),
 		TerminalsAlwaysDark: models.GetOr(req, "terminalsAlwaysDark", false),
 		SkipTemplates:       models.GetOr(req, "skipTemplates", ""),
+		Contrast:            models.GetOr(req, "contrast", 0.0),
 	}
 
 	wait := models.GetOr(req, "wait", true)