keys: Add missing key combinations provided by urwid-readline.

Updated key bindings to include undocumented key combinations that are
provided by urwid_readline.

For reference see:
  https://github.com/rr-/urwid_readline/blob/master/urwid_readline/readline_edit.py#L88

All undocumented hotkeys and commands provided by urwid_readline are now
present, except for:
- delete and backspace keys, as they're fairly obvious in modern systems
- Ctrl + d hotkey for character deletion (same as delete key)
  - currently used for sending messages from the compose box
- Ctrl + b/f hotkeys for stepping backwards/forwards by one character
  - Ctrl + f is currently used for autocomplete from the compose box

Hotkeys document regenerated.

Author: Niloth-p

docs/hotkeys.md

@@ -83,16 +83,17 @@
 |Autocomplete @mentions, #stream_names, :emoji: and topics|<kbd>Ctrl</kbd> + <kbd>f</kbd>|
 |Cycle through autocomplete suggestions in reverse|<kbd>Ctrl</kbd> + <kbd>r</kbd>|
 |Narrow to compose box message recipient|<kbd>Meta</kbd> + <kbd>.</kbd>|
-|Jump to the beginning of line|<kbd>Ctrl</kbd> + <kbd>a</kbd>|
-|Jump to the end of line|<kbd>Ctrl</kbd> + <kbd>e</kbd>|
-|Jump backward one word|<kbd>Meta</kbd> + <kbd>b</kbd>|
-|Jump forward one word|<kbd>Meta</kbd> + <kbd>f</kbd>|
+|Jump to the beginning of line|<kbd>Ctrl</kbd> + <kbd>a</kbd> / <kbd>Home</kbd>|
+|Jump to the end of line|<kbd>Ctrl</kbd> + <kbd>e</kbd> / <kbd>End</kbd>|
+|Jump backward one word|<kbd>Meta</kbd> + <kbd>b</kbd> / <kbd>Shift</kbd> + <kbd>Left</kbd>|
+|Jump forward one word|<kbd>Meta</kbd> + <kbd>f</kbd> / <kbd>Shift</kbd> + <kbd>Right</kbd>|
 |Delete previous character (to left)|<kbd>Ctrl</kbd> + <kbd>h</kbd>|
 |Transpose characters|<kbd>Ctrl</kbd> + <kbd>t</kbd>|
 |Cut forwards to the end of the line|<kbd>Ctrl</kbd> + <kbd>k</kbd>|
 |Cut backwards to the start of the line|<kbd>Ctrl</kbd> + <kbd>u</kbd>|
 |Cut forwards to the end of the current word|<kbd>Meta</kbd> + <kbd>d</kbd>|
-|Cut backwards to the start of the current word|<kbd>Ctrl</kbd> + <kbd>w</kbd>|
+|Cut backwards to the start of the current word|<kbd>Ctrl</kbd> + <kbd>w</kbd> / <kbd>Meta</kbd> + <kbd>Backspace</kbd>|
+|Cut the current line|<kbd>Meta</kbd> + <kbd>x</kbd>|
 |Paste last cut section|<kbd>Ctrl</kbd> + <kbd>y</kbd>|
 |Undo last action|<kbd>Ctrl</kbd> + <kbd>_</kbd>|
 |Jump to the previous line|<kbd>Up</kbd> / <kbd>Ctrl</kbd> + <kbd>p</kbd>|

zulipterminal/config/keys.py

@@ -321,22 +321,22 @@ class KeyBinding(TypedDict):
         'key_category': 'general',
     },
     'BEGINNING_OF_LINE': {
-        'keys': ['ctrl a'],
+        'keys': ['ctrl a', 'home'],
         'help_text': 'Jump to the beginning of line',
         'key_category': 'msg_compose',
     },
     'END_OF_LINE': {
-        'keys': ['ctrl e'],
+        'keys': ['ctrl e', 'end'],
         'help_text': 'Jump to the end of line',
         'key_category': 'msg_compose',
     },
     'ONE_WORD_BACKWARD': {
-        'keys': ['meta b'],
+        'keys': ['meta b', 'shift left'],
         'help_text': 'Jump backward one word',
         'key_category': 'msg_compose',
     },
     'ONE_WORD_FORWARD': {
-        'keys': ['meta f'],
+        'keys': ['meta f', 'shift right'],
         'help_text': 'Jump forward one word',
         'key_category': 'msg_compose',
     },
@@ -366,10 +366,15 @@ class KeyBinding(TypedDict):
         'key_category': 'msg_compose',
     },
     'CUT_TO_START_OF_WORD': {
-        'keys': ['ctrl w'],
+        'keys': ['ctrl w', 'meta backspace'],
         'help_text': 'Cut backwards to the start of the current word',
         'key_category': 'msg_compose',
     },
+    'CUT_WHOLE_LINE': {
+        'keys': ['meta x'],
+        'help_text': 'Cut the current line',
+        'key_category': 'msg_compose',
+    },
     'PASTE_LAST_CUT': {
         'keys': ['ctrl y'],
         'help_text': 'Paste last cut section',