For historical reasons, mouse events represent keyboard modifiers as a bitfield,
but keyboard events represent modifiers as a bitfield-plus-one. For example, a
mouse event with an Alt modifier will use the value 4, but a keyboard event will
use the value 5.
Previously, I refactored the parse_mask() helper to do the subtraction itself,
instead of requiring the caller to do it. This made keyboard-event decoding much
cleaner, but I didn't realise it broke mouse-event decoding. Now the subtraction
is done only for keyboard events.
Fixes#4176.
In some cases, it may be difficult to easily spot the area out of the buffer
(bad color scheme, small font, superimposed windows).
This patch adds two ncurses ui_options to bypass this problem:
- `ncurses_padding_char`, to configure the padding character,
- `ncurses_padding_fill`, to indicate whether to fill the padding line
(or to display a single character).
The default config is the legacy one (a single "~").
Kakoune now knows about all the keypad keys listed in:
https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-PC-Style-Function-Keyshttps://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h2-VT220-Style-Function-Keys
The VT220-style encodings are used to for modified numeric keys when NumLock is
off. For example, consider the 8/Up key:
| Modifiers | Sequence | Notes |
|-----------------|-------------|-------------------|
| Unmodified | CSI A | Ordinary up arrow |
| Shift | SS3 2 x | Shift-8 |
| NumLock | 8 | Ordinary 8 |
| Shift + NumLock | CSI 1 ; 2 A | Shift-Up |
Note that even though the terminal distinguishes between keypad and regular keys,
Kakoune maps keypad keys onto regular keys - keypad Enter is still <ret>, it
just supports more modifiers than the regular Enter key.
It's useful for parsing modifier masks in all kinds of sequences, not just CSI
sequences. Also, since the modifier mask always has "1" as "no modifiers",
do the subtraction inside parse_mask() instead of when calling it.
This avoids 100% CPU usage when we have pending fifo input while running
a shell process, as we will not end-up busy looping in pselect but not
reading the available data due to being only processing urgent events.
Different terminals send different codes to indicate backspace, usually one of
\x08 or \x7f, so Kakoune blindly treated both as backspace. However, a given
terminal is only likely to use one of those, and mnemonic control codes like
<c-h> are a precious resource so we should endeavour to keep backspace and
<c-h> separate when we can. Luckily, termios tells us what code our terminal is
currently using, and Kakoune already reads the information at startup, so we can
just use that information.
Thanks to @krobelus for figuring out the C++ syntax required.
Fixes#3863.
0 means stdin was closed, this is quite unexpected as we would usually
get a SIGHUP, but it looks like in some rare case this happens and
it leads to an infinite loop trying to handle stdin events (as it
will always be readable from now on).
Fixes#3557
Previously, Kakoune only handled ctrl-codes less than 27, representing them as
lower-case ASCII codes. For regular keys like <c-a>, that worked fine. However,
NUL became the unorthodox <c-`> and other ctrl-symbols (<c-\>, <c-]>, <c-_>)
weren't supported at all.
Now NUL is rendered as the more comfortable <c-space>, and the other ctrl-symbol
codes are properly decoded.
Fixes#2553.
ncurses_ui.cc:759:59: error: non-constant-expression cannot be narrowed from type 'unsigned int' to 'Key::MouseButton' in initializer list [-Wc++11-narrowing]
return mouse_button(mod, Key::MouseButton{code}, coord, c == 'm');
^~~~
Rxvt emits `\E[23$` and `\E[24$` for `F21` and `F22` (alias `s-F11` and
`s-F12` provided that `ncurses_shift_function_key` is set to `10`),
respectively.
Optmize the code to avoid allocating like crazy, unify various
info style rendering, crop content and display markers that there
is more text remaining.
Fixes#2257
