code: use variables for the colors

src/Node2D.gd

@@ -13,13 +13,18 @@ var root_tree
 onready var Tree = $Panel/Tree
 onready var ConsoleDisplay = $ConsolePanel/RichTextLabel
 
+var color_delete =  Color(0.9,0.2,0.2,0.6)
+var color_installed = Color(0.7, 0.7,0.2,0.5)
+var color_toinstall = Color(0.5,1,0.5,1)
+
 func get_installed_packages():
 	var buffer = [] 
 	installed_packages = [] 
 # warning-ignore:return_value_discarded
 	OS.execute("pkg_info", [], true, buffer, true)
-	for p in buffer[0].split("\n"):
-		installed_packages.append(p.split(" ")[0])
+	if buffer:
+		for p in buffer[0].split("\n"):
+			installed_packages.append(p.split(" ")[0])
 
 func _ready():
 	get_installed_packages()
@@ -62,18 +67,16 @@ func _on_Tree_multi_selected():
 		packages.erase(item.get_text(0))
 	elif not status: # we install it
 		packages.append(item.get_text(0))
-		item.set_custom_bg_color(0, Color(0.5,1,0.5,1))
+		item.set_custom_bg_color(0, color_toinstall)
 		item.set_metadata(0, "for_install")
 	elif status == "installed": # we delete it 
 		packages_to_delete.append(item.get_text(0))
-		item.set_custom_bg_color(0, Color(0.9,0.2,0.2,0.6))
+		item.set_custom_bg_color(0, color_delete)
 		item.set_metadata(0, "to_delete")
 	elif status == "to_delete": # we keep it 
 		packages_to_delete.erase(item.get_text(0))
-		item.set_custom_bg_color(0, Color(0.7, 0.7,0.2,0.5))
+		item.set_custom_bg_color(0, color_installed)
 		item.set_metadata(0, "installed")
-		
-
 
 func _on_LineEdit_text_entered(text):
 	Tree.clear()
@@ -119,7 +122,7 @@ func _on_LineEdit_text_entered(text):
 			root.set_text(1, s["descr"])
 		if s["pkgname"] in installed_packages:
 			root.set_metadata(0, "installed")
-			root.set_custom_bg_color(0, Color(0.7, 0.7,0.2,0.5))
+			root.set_custom_bg_color(0, color_installed)
 
 func reset_display():
 	$ConsolePanel.hide()