feat: add 'run --dark-theme' (fix #68)

cmd_run.go

@@ -30,6 +30,7 @@ type runOptions struct {
 	Destination     string
 	DebugGraph      bool
 	NoCompress      bool
+	DarkTheme       bool
 
 	Targets []string
 	//Preview     bool
@@ -46,6 +47,7 @@ func runSetupFlags(flags *pflag.FlagSet, opts *runOptions) {
 	flags.BoolVarP(&opts.DebugGraph, "debug-graph", "", false, "debug graph")
 	flags.BoolVarP(&opts.ShowOrphans, "show-orphans", "", false, "show issues not linked to an epic")
 	flags.BoolVarP(&opts.NoCompress, "no-compress", "", false, "do not compress graph (no overlap)")
+	flags.BoolVarP(&opts.DarkTheme, "dark-theme", "", false, "dark theme")
 	flags.StringVarP(&opts.EpicLabel, "epic-label", "", "epic", "label used for epics (empty means issues with dependencies but without dependants)")
 	flags.StringVarP(&opts.Destination, "destination", "", "-", "destination ('-' for stdout)")
 	flags.StringSliceVarP(&opts.AdditionalPulls, "additional-pull", "", []string{}, "additional pull that won't necessarily be displayed on the graph")

graphviz.go

@@ -41,18 +41,22 @@ func graphviz(issues Issues, opts *runOptions) (string, error) {
 	panicIfErr(g.SetName("G"))
 	attrs := map[string]string{}
 	attrs["truecolor"] = "true"
-	attrs["sep"] = "-0.7"
-	attrs["compound"] = "true"
-	attrs["splines"] = "true"
 	attrs["rankdir"] = "RL"
-	attrs["ranksep"] = "0.3"
-	attrs["nodesep"] = "0.1"
-	attrs["margin"] = "0.2"
-	attrs["center"] = "true"
-	attrs["constraint"] = "false"
+	attrs["constraint"] = "true"
+	attrs["compound"] = "true"
 	if !opts.NoCompress {
+		attrs["center"] = "true"
+		attrs["ranksep"] = "0.3"
+		attrs["nodesep"] = "0.1"
+		attrs["margin"] = "0.2"
+		attrs["sep"] = "-0.7"
+		attrs["constraint"] = "false"
+		attrs["splines"] = "true"
 		attrs["overlap"] = "compress"
 	}
+	if opts.DarkTheme {
+		attrs["bgcolor"] = "black"
+	}
 
 	for k, v := range attrs {
 		panicIfErr(g.AddAttr("G", k, v))