feat(command): open in terminal editor command in composing message

On OPEN_IN_TERMINAL_EDITOR command allow to edit the current message in terminal editor with python tempfile.

Author: mek-yt

docs/hotkeys.md

@@ -96,4 +96,5 @@
 |Jump to the previous line|<kbd>up</kbd> / <kbd>ctrl</kbd> + <kbd>p</kbd>|
 |Jump to the next line|<kbd>down</kbd> / <kbd>ctrl</kbd> + <kbd>n</kbd>|
 |Clear compose box|<kbd>ctrl</kbd> + <kbd>l</kbd>|
+|Edit the current raw message in terminal editor ($EDITOR)|<kbd>ctrl</kbd> + <kbd>o</kbd>|
 

zulipterminal/config/keys.py

@@ -385,6 +385,11 @@ class KeyBinding(TypedDict):
         'help_text': 'Clear compose box',
         'key_category': 'msg_compose',
     },
+    'OPEN_IN_TERMINAL_EDITOR': {
+        'keys': ['ctrl o'],
+        'help_text': 'Edit the current raw message in terminal editor ($EDITOR)',
+        'key_category': 'msg_compose',
+    },
     'FULL_RENDERED_MESSAGE': {
         'keys': ['f'],
         'help_text': 'Show/hide full rendered message (from message information)',

zulipterminal/ui_tools/boxes.py

@@ -3,9 +3,11 @@
 """
 
 import re
+import subprocess
 import unicodedata
 from collections import Counter
 from datetime import datetime, timedelta
+from tempfile import NamedTemporaryFile
 from time import sleep
 from typing import Any, Callable, Dict, List, NamedTuple, Optional, Tuple
 
@@ -810,6 +812,17 @@ def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
         elif is_command_key("MARKDOWN_HELP", key):
             self.view.controller.show_markdown_help()
             return key
+        elif is_command_key("OPEN_IN_TERMINAL_EDITOR", key):
+            edit_tempfile = NamedTemporaryFile(suffix=".md")
+            with open(edit_tempfile.name, mode="w") as edit_writer:
+                edit_writer.write(self.msg_write_box.edit_text)
+            self.view.controller.loop.screen.stop()
+            subprocess.call([f"$EDITOR {edit_tempfile.name}"], shell=True)
+            with open(edit_tempfile.name, mode="r") as edit_reader:
+                self.msg_write_box.edit_text = edit_reader.read()
+            edit_tempfile.close()
+            self.view.controller.loop.screen.start()
+            return key
         elif is_command_key("SAVE_AS_DRAFT", key):
             if self.msg_edit_state is None:
                 if self.compose_box_status == "open_with_private":