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doco: Note some common $TERM mistakes and how to fix them.

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Also explain more clearly the difference between Vim and Nvim
when it comes to built-in terminfo entries.
This commit is contained in:
Jonathan de Boyne Pollard
2017-05-29 08:02:39 +01:00
parent 1c1231bf13
commit 533f5c38c4
2 changed files with 36 additions and 3 deletions
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34
runtime/doc/term.txt
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@@ -24,10 +24,30 @@ the pc terminal, for Unix an ansi terminal.
On Unix the terminfo database is used. There is no access to the terminfo
settings with |:set|.
If you experience terminal difficulties, first ensure that you have set the
correct terminal type in your $TERM environment variable so that Nvim is
pulling the correct entry from the terminfo database in the first place.
As noted in the commentary in the terminfo source file:
- The correct $TERM for GNOME Terminal has been "gnome" since 1999, or
"gnome-256color" since 2006. "vte" and "vte-256color" are equivalents.
"xterm" and "xterm-256color" are incorrect.
- The correct $TERM for iTerm.app is "iterm" or "iTerm.app". "xterm" and
"xterm-256color" are incorrect; for starters they do not include
iTerm.app's status line capability.
- The correct $TERM for Terminal.app is "nsterm". "vt100", "xterm", and
"xterm-256color" are incorrect; for starters they do not include
Terminal.app's status line capability or correctly describe its
cursor-addressed mode.
- The correct $TERM for tmux is "tmux" or "tmux-256color". "screen" is
incorrect; for starters it does not include tmux's italics and status line
capabilities or correctly describe how to set inverse video.
*builtin-terms* *builtin_terms*
If a terminfo database is not available, Nvim will look up the terminal type
in a compiled-in mini-database of terminfo entries for "xterm", "putty",
"screen", "tmux", "rxvt", "iterm", "interix", "linux", and "ansi".
If a |terminfo| database is not available, or no entry for the terminal type is
found in that database, Nvim will look up the terminal type in a compiled-in
mini-database of terminfo entries for "xterm", "putty", "screen", "tmux",
"rxvt", "iterm", "interix", "linux", "st", "vte", "gnome", and "ansi".
The lookup matches the initial portion of the terminal type, so (for example)
"putty-256color" and "putty" will both be mapped to the built-in "putty"
@@ -37,6 +57,14 @@ capable if possible. See |termcap-colors|.
If no built-in terminfo record matches the terminal type, the built-in "ansi"
terminfo record is used as a final fallback.
The built-in mini-database is not combined with an external terminfo database,
nor can it be used in preference to one. You can thus entirely override any
omissions or out-of-date information in the built-in terminfo database by
supplying an external one with entries for the terminal type. Note that the
Unibilium library (used by Nvim to read terminfo) allows you to override an
out-of-date system terminfo database with one in your $HOME/.terminfo/
directory.
Settings depending on terminal *term-dependent-settings*
If you want to set options or mappings, depending on the terminal name, you

5
runtime/doc/vim_diff.txt
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@@ -160,6 +160,11 @@ Because of general |256-color| usage whereever possible, Nvim will even use
256-colour capability on Linux virtual terminals. Vim uses only 8 colours
plus bright foreground on Linux VTs.
Vim combines what is in its |builtin-terms| with what it reads from termcap,
and has a |ttybuiltin| setting to control how that combination works. Nvim
uses either one or the other of an external |terminfo| entry or the built-in
one. It does not attempt to mix data from the two.
|:!| does not support "interactive" commands. Use |:terminal| instead.
(GUI Vim has a similar limitation, see ":help gui-pty" in Vim.)