Improve file dialog and command line behavior

NEWS.md

@@ -8,8 +8,13 @@ Ported to Tcl/Tk.
 
 * Application icon
 * Full screen toggle
+* Ability to name new files on the command line
 * Console support (only in Tcl/Tk version)
 
+### Changed
+
+* File dialogs now set a suitable initial directory.
+
 ### Fixed
 
 * Font size key combos were reversed.

scrunch2.py

@@ -44,7 +44,7 @@ else:
 
 about_text = """
 A two-pane outliner
-Version 2.1a (11 December 2022)
+Version 2.1b (12 December 2022)
 MIT License
 """
 
@@ -281,6 +281,12 @@ def save_file(full_path):
 		showerror("Error saving file", str(e), parent=top)
 		return False
 
+def file_dir():
+	if outline_filename != None:
+		return os.path.dirname(outline_filename)
+	else:
+		return "."
+
 def all_item_ids(item = ""):
 	"Return a flat list of item IDs present in the tree."
 	items = []
@@ -374,6 +380,7 @@ def handle_open():
 			return
 	choice = askopenfilename(
 		title="Open existing outline",
+		initialdir=file_dir(),
 		filetypes=file_types,
 		parent=top)
 	if len(choice) == 0:
@@ -397,6 +404,7 @@ def handle_saveas():
 	
 	choice = asksaveasfilename(
 		title="Save outline as...",
+		initialdir=file_dir(),
 		filetypes=file_types,
 		parent=top)
 	if len(choice) == 0:
@@ -940,7 +948,11 @@ if top.tk.call('tk', 'windowingsystem') == 'x11':
 
 if len(sys.argv) < 2:
 	pass
+elif not os.path.exists(sys.argv[1]):
+	outline_filename = os.path.abspath(sys.argv[1])
+	fn = os.path.basename(outline_filename)
+	top.title(fn + " | Scrunch Edit")	
 elif load_file(sys.argv[1]):
-	outline_filename = sys.argv[1]
+	outline_filename = os.path.abspath(sys.argv[1])
 
 top.mainloop()