PM...ST actually sends the string to screen's message area. Sending the
string to the status line requires a different control sequence peculiar to
screen.
Also make iTerm2 SGR 38/48 consistent.
The Interix termcap entry is missing the carriage_return capability which nvim
relies upon. And Interix is one of the few terminal emulators that does not
defer automatic wrap at the right margin, which is now accounted for when
moving the cursor left and when outputting whole lines at a time.
tmux has its own code path, now; and the tmux wrapping was not the ideal thing
to do in the first place.
Also improve the commentary on the built-in terminfo records.
The details are in the on-line help under :help true-color .
The brief precis is that nvim is (I hope.) converging with tmux and libvte.
It is taking the same approach with setrgbf and setrgbb terminfo capabilities
that it does with the Ss and Se terminfo capabilities.
The details are in the on-line help under :help cursor-shape .
The brief precis is that nvim is following the lead of tmux, and going
beyond what tmux does to make cursor shape changes work on a broad range of
terminals. This includes on tmux itself, which is no longer bypassed.
Ironically, higher layers trying to be "smart" about the terminal type
but not actually being very smart at all, makes it more difficult rather
than less to correct the TUI layer.
Note that this orphans the os_term_is_nice() function and down the road,
presuming that we do not have to revert this, that function can be removed.
It incorporates knowledge of terminal types and behaviours in the wrong place.
There are now a few built-in terminfo entries, taken either from unibilium
or ncurses terminfo, for falling back upon when there is no terminfo database
or when it is missing stuff. In an ideal world, these would be in unibilium
itself.
The ultimate fallback, for no terminfo database and no built-in terminfo
record that matches the terminal type, is now the "ansi" terminal type; so
unknown terminal types are now considered to have at minimum the basic
ECMA-48 colour, motion, and editing capabilities.
The terminfo records are just blobs, raw images of the equivalent terminfo file
created with the od command. No longer are incomplete terminfo records built
up with code. These blobs are the full, real, records; already built.
The post-processing of the terminfo record, once found, is split into the
part where we fix known errors and deficiencies in terminfo, and the part
where we add extensions that we need that terminfo does not define
capabilities for. In an ideal world, the former would be a no-op.
No part of the TUI layer apart from these is aware of terminal type or has
conditional code based upon checking environment variables at runtime. It
is all pre-calculated and written into unibilium (or the TUIData object) at
initialization time.
This is fairly aggressive about turning on 256-colour and true colour support.
This also positively decodes genuine xterm for turning on DECSLRM use, rather
than assuming that anything that says that it is xterm is actually xterm,
fixing scrolling problems with vertically split windows.
This documents 256-colour and true colour handling, cursor shapes,
and scrolling regions.
Almost all of these headings are taken from the Vim doco, so that
the :help commands that people learn are a transferable skill.
PuTTY does not implement DECLRMM or DECSLRM, but it does implement DECSTBM.
So allow using PuTTY terminal scrolling when the scroll rectangle is the
full width of the terminal.
Instead of emitting CUP in several places each with their own poor local
optimizations, funnel all cursor motion through a central place.
This central function performs the same optimization for every place that
needs to move the cursor, and implements a better set of optimizations:
* Emit CUU/CUD/CUF/CUB instad of CUP when they are likely shorter.
* Use BS and LF when they are shorter than CUB and CUD.
* Use CR for quick returns to column zero.
* If printing the next few characters is shorter than a rightwards motion,
then just write out the characters.
LuaRocks 2.3 and onwards changed the /P option to no longer include the
version number which made newer releases of LuaRocks fail when compiling
on Windows.
