fix checkbox rendering on most terminals

README.md

@@ -118,4 +118,3 @@ systemctl start docker
 ## Bugs
 
 - Long todos don't render properly in strikethrough mode (in certain terminals)
-- Some terminals display the checkbox character weirdly (currently uses two space workaround)

src/class_todo.py

@@ -1,7 +1,7 @@
 # pylint: disable=global-statement, missing-class-docstring
 # pylint: disable=missing-function-docstring, missing-module-docstring
 
-from src.get_args import INDENT
+from src.get_args import CHECKBOX, INDENT
 
 
 class Todo:
@@ -67,7 +67,7 @@ def set_color(self, color: int) -> None:
 
     def get_box(self) -> str:
         table = {
-            "+": "☑  ",
+            "+": f"{CHECKBOX}  ",
             "-": "☐  ",
             None: "",
         }

src/get_args.py

@@ -2,11 +2,14 @@
 # pylint: disable=missing-function-docstring, missing-module-docstring
 
 from argparse import ArgumentParser, Namespace, RawDescriptionHelpFormatter
+from curses import wrapper
 from pathlib import Path
+from typing import Any
 
 from src.md_to_py import md_table_to_lines
 
 BULLETS = False
+CHECKBOX = ""
 CONTROLS_BEGIN_INDEX = 67
 CONTROLS_END_INDEX = 91
 DEFAULT_TODO = "todo.txt"
@@ -20,6 +23,16 @@
 SIMPLE_BOXES = False
 STRIKETHROUGH = False
 
+CHECKBOX_OPTIONS = ("🗹", "☑")
+
+
+def _get_checkbox(win: Any) -> str:
+    try:
+        win.addch(0, 0, CHECKBOX_OPTIONS[0])
+        return CHECKBOX_OPTIONS[0]
+    except TypeError:
+        return CHECKBOX_OPTIONS[1]
+
 
 def get_args() -> Namespace:
     parser = ArgumentParser(
@@ -127,11 +140,14 @@ def get_args() -> Namespace:
         help="Allows passing alternate header.\
             Default is filename.",
     )
-    return parser.parse_args()
+    args = vars(parser.parse_args())
+    args["checkbox"] = wrapper(_get_checkbox) if not args["simple_boxes"] else ""
+    return Namespace(**args)
 
 
 command_line_args = get_args()
 BULLETS = command_line_args.bullet_display
+CHECKBOX = command_line_args.checkbox
 ENUMERATE = command_line_args.enumerate
 FILENAME = (
     Path(command_line_args.filename, DEFAULT_TODO)