On Sun, Nov 11, 2007 at 01:24:11PM +0100, Bram Moolenaar wrote:
>
> Interesting idea. It's certainly more convenient to use the #rrggbb
> value than looking up the number. Especially since the number depends
> on the terminal, 88 or 256 colors.
>
> Taking this a step further: We could also make it work for 8 and 16
> color terminals. Instead of "blue" you would use #0000ff. Not sure how
> complicated this will get though. And for an 8 color terminal one would
> still need to tune the colors.
That's a bit tough, since we would need to either be able to query the
current value of each of the &t_Co colors from the terminal emulator
(which AFAIK isn't portable across all TE's; see below) or make an
assumption about what each of those colors are (which is a bad idea,
since everyone I know who spends significant time in the terminal has
tweaked those 16 colors to be good for his own eyes; not to mention
that most TE's use different defaults, especially between those that
default to a light background vs those that default to a dark one).
Another hurdle with supporting this for 16 color terminals is that
there are really *very* few colors available. Any colorscheme that
tries to subtly vary colors, for instance using many shades of red,
would just look awful when there are only 2 reds to choose from.
Also, we already support color names for 8 and 16 color terminals.
My humble opinion is that it is too much work with too many hurdles to
bother implementing for 16 color terminals, especially since we can
already use names rather than numbers.
> Do all the terminals supporting 88 and 256 colors really use the same
> color values?
Well... As far as I can tell, they seem to _default_ to the same
values. In the interest of researching this properly, I've
source-dived a few to be sure.
GNOME Terminal: same palette as xterm-256color (vte.c:2399)
PuTTY (pterm): same palette as xterm-256color (gtkwin.c:1432)
Mrxvt: same palette as xterm-256color (init.c:110)
Rxvt-unicode: 88 colour palette (init.C:74).
A quick scan through the Konsole sources didn't turn up the spot where
they set up the default sources, but there is a note in
README.moreColors saying "There is a predefined 256 color space
compatible with his xterm sister", which I read as saying that colors
16 through 255 are compatible with those in xterm.
Are there any other terminals supporting more than 16 colors that
I should check out?
Now, the patch I submitted used the simplifying assumption that the
user did not _change_ the colors in the cube or greyscale ramp (which
is possible in xterm through resources or control sequences, urxvt
using at least control sequences, and through some means in konsole,
I believe).
I agree that it would be better if we could query for the current
values, and work with those rather than the defaults. That's possible
for xterm and urxvt, at least, using ESC ] 4;17;? BEL. It's slightly
more complicated when running inside gnu screen, though, since you
have to tell screen to output that sequence to the TE that it's
running in directly, without interpreting it itself, using
ESC P ESC ] 4;17;? BEL ESC \. So, then, the issue is.. How do we
know when we can query, and what sequence to use to do it? Is there
a standard idiom for this? As far as I know, this is still a very
hairy issue, since we can't trust terminfo/termcap, and exported
environment variables only get you so far...
Also, perhaps more importantly, even if we can check, when should we
do it? It doesn't seem that we can reasonably handle it if, for
instance, the user enters Vim, suspends it, changes a color, and then
foregrounds Vim again. Should we only check when Vim is started?
If we decide that checking the current colors is reasonable, I would
venture that the most reasonable time to check is on each :highlight
command, since in the event that the user does something like changing
a color while Vim is still running, it could be fixed by just redoing
the :colorscheme command. Would checking once per :highlight be too
expensive, though?
And, while it's in my head: one *very* cool (albeit tangential)
feature would be the ability to dynamically change the xterm colors to
match the requested ones. This, however, would be pretty tough to do
consistently: we would need to save the values when we start and
restore them whenever we get a signal, or whenever we execute
a command with :! when using an xterm with altscreen support, and it
would need to be controlled by an option, since it would affect, for
instance, all screens in gnu screen, not just the current one. Off
topic at the moment, but it might be worth some more consideration in
the future, especially since it would mean that we could even make
very pretty colorschemes in 16 color terminals that support
dynamically changing those colors.
> > + This works by attempting to gracefully degrade the specified color to
> > + a similar available color. In practice, you will likely not get
> > + exactly the color you ask for; you will get the closest color that
> > + your terminal emulator supports. If your terminal emulator does not
> > + report supporting at least 88 colors, this will fail. If you are
> > + certain that your terminal emulator does support 88 or more colors,
> > + a possible workaround might be to set t_Co in your .vimrc, for
> > + instance: >
> > + if $TERM =~ 'xterm'
> > + set t_Co=256
> > + endif
>
> If the xterm was compiled properly Vim can request it to send the number
> of colors being used. See ":help xterm-codes". Unfortunately
> termcap/terminfo are totally useless for these things.
Yes.. But it doesn't help for xterm -> screen -> vim, with the same
problem as above. I don't know that it's sufficiently generic, and
a pointer in the help seems like a better idea...
> The stuff to haneld grey and non-grey colors looks like a bit of a hack.
> Isn't there a more consistent solution?
I'm open to suggestions. A better solution might be to figure out if
the author probably wanted a grey, by saying for instance,
abs(r-b) < 16 && abs(b-g) < 16 && abs(g-r) < 16 and then filtering for
lowest Euclidean distance in rgb space, excluding greys if necessary.
Either way, it's not worth focusing on if we plan to support
customized, as opposed to default, palettes. The algorithm will need
complete retooling; the current algorithm does revolve quite tightly
around the standard values.
> > + if (hex[i] >= '0' && hex[i] <= '9')
> > + *(rgb+i/2) += (hex[i] - '0') * order;
> > + else if (hex[i] >= 'A' && hex[i] <= 'F')
> > + *(rgb+i/2) += (hex[i] - 'A' + 10) * order;
> > + else if (hex[i] >= 'a' && hex[i] <= 'f')
> > + *(rgb+i/2) += (hex[i] - 'a' + 10) * order;
>
> You can use hexhex2nr() here.
I figured there was a utility function around for this and I just
couldn't find it.
Looking at the #if defined()'s around hexhex2nr, what #defines are
paired with this cterm[fb]g=#rrggbb feature? Is it just
#ifndef ALWAYS_USE_GUI, or is there something else that needs to be
considered? Is this useful in windows builds, for instance?
> I would appreciate some people trying this on various terminals to check
> that it really works. Perhaps you can write a color scheme that uses
> the RGB values for people to try out?
Absolutely. I've attached copies of my two favorite colorschemes,
brookstream for dark terminals and autumnleaf for light terminals,
each modified to work with cterm[fb]g=#rrggbb values. They'll work in
a patched vim, in both an 88 or 256 color terminal or in gvim, but
they won't work in an 8 or 16 color terminal.
~Matt
--~--~---------~--~----~------------~-------~--~----~
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" Vim color file
" Maintainer: Anders Korte
" Last Change: 17 Oct 2004
" AutumnLeaf color scheme 1.0
set background=light
hi clear
if exists("syntax_on")
syntax reset
endif
let colors_name="autumnleaf-rgb"
" Colors for the User Interface.
hi Cursor ctermbg=#aa7733 guibg=#aa7733 ctermfg=#ffeebb guifg=#ffeebb
cterm=bold gui=bold
hi Normal ctermbg=#fffdfa guibg=#fffdfa ctermfg=black guifg=black
cterm=none gui=none
hi NonText ctermbg=#eafaea guibg=#eafaea ctermfg=#000099 guifg=#000099
cterm=bold gui=bold
hi Visual ctermbg=#fff8cc guibg=#fff8cc ctermfg=black guifg=black
cterm=none gui=none
" hi VisualNOS
hi Linenr ctermbg=bg guibg=bg ctermfg=#999999 guifg=#999999
cterm=none gui=none
" Uncomment these if you use Diff...??
" hi DiffText ctermbg=#cc0000 guibg=#cc0000 ctermfg=white guifg=white
cterm=none gui=none
" hi DiffAdd ctermbg=#0000cc guibg=#0000cc ctermfg=white guifg=white
cterm=none gui=none
" hi DiffChange ctermbg=#990099 guibg=#990099 ctermfg=white guifg=white
cterm=none gui=none
" hi DiffDelete ctermbg=#888888 guibg=#888888 ctermfg=#333333 guifg=#333333
cterm=none gui=none
hi Directory ctermbg=bg guibg=bg ctermfg=#337700 guifg=#337700
cterm=none gui=none
hi IncSearch ctermbg=#c8e8ff guibg=#c8e8ff ctermfg=black guifg=black
cterm=none gui=none
hi Search ctermbg=#c8e8ff guibg=#c8e8ff ctermfg=black guifg=black
cterm=none gui=none
hi SpecialKey ctermbg=bg guibg=bg ctermfg=fg guifg=fg cterm=none
gui=none
hi Titled ctermbg=bg guibg=bg ctermfg=fg guifg=fg cterm=none
gui=none
hi ErrorMsg ctermbg=bg guibg=bg ctermfg=#cc0000 guifg=#cc0000
cterm=bold gui=bold
hi ModeMsg ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399
cterm=none gui=none
hi link MoreMsg ModeMsg
hi link Question ModeMsg
hi WarningMsg ctermbg=bg guibg=bg ctermfg=#cc0000 guifg=#cc0000
cterm=bold gui=bold
hi StatusLine ctermbg=#ffeebb guibg=#ffeebb ctermfg=black guifg=black
cterm=bold gui=bold
hi StatusLineNC ctermbg=#aa8866 guibg=#aa8866 ctermfg=#f8e8cc guifg=#f8e8cc
cterm=none gui=none
hi VertSplit ctermbg=#aa8866 guibg=#aa8866 ctermfg=#ffe0bb guifg=#ffe0bb
cterm=none gui=none
" hi Folded
" hi FoldColumn
" hi SignColumn
" Colors for Syntax Highlighting.
hi Comment ctermbg=#ddeedd guibg=#ddeedd ctermfg=#002200 guifg=#002200
cterm=none gui=none
hi Constant ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=bold
gui=bold
hi String ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399
cterm=italic gui=italic
hi Character ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399
cterm=italic gui=italic
hi Number ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=bold
gui=bold
hi Boolean ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=bold
gui=bold
hi Float ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=bold
gui=bold
hi Identifier ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=none
gui=none
hi Function ctermbg=bg guibg=bg ctermfg=#0055aa guifg=#0055aa cterm=bold
gui=bold
hi Statement ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399 cterm=none
gui=none
hi Conditional ctermbg=bg guibg=bg ctermfg=#aa7733 guifg=#aa7733 cterm=bold
gui=bold
hi Repeat ctermbg=bg guibg=bg ctermfg=#aa5544 guifg=#aa5544 cterm=bold
gui=bold
hi link Label Conditional
hi Operator ctermbg=bg guibg=bg ctermfg=#aa7733 guifg=#aa7733 cterm=bold
gui=bold
hi link Keyword Statement
hi Exception ctermbg=bg guibg=bg ctermfg=#228877 guifg=#228877 cterm=bold
gui=bold
hi PreProc ctermbg=bg guibg=bg ctermfg=#aa7733 guifg=#aa7733
cterm=bold gui=bold
hi Include ctermbg=bg guibg=bg ctermfg=#558811 guifg=#558811
cterm=bold gui=bold
hi link Define Include
hi link Macro Include
hi link PreCondit Include
hi Type ctermbg=bg guibg=bg ctermfg=#007700 guifg=#007700
cterm=bold gui=bold
hi link StorageClass Type
hi link Structure Type
hi Typedef ctermbg=bg guibg=bg ctermfg=#009900 guifg=#009900
cterm=italic gui=italic
hi Special ctermbg=bg guibg=bg ctermfg=fg guifg=fg cterm=none
gui=none
hi SpecialChar ctermbg=bg guibg=bg ctermfg=fg guifg=fg cterm=bold
gui=bold
hi Tag ctermbg=bg guibg=bg ctermfg=#003399 guifg=#003399
cterm=bold gui=bold
hi link Delimiter Special
hi SpecialComment ctermbg=#dddddd guibg=#dddddd ctermfg=#aa0000
guifg=#aa0000 cterm=none gui=none
hi link Debug Special
hi Underlined ctermbg=bg guibg=bg ctermfg=blue guifg=blue cterm=underline
gui=underline
hi Title ctermbg=bg guibg=bg ctermfg=fg guifg=fg cterm=bold gui=bold
hi Ignore ctermbg=bg guibg=bg ctermfg=#999999 guifg=#999999 cterm=none
gui=none
hi Error ctermbg=red guibg=red ctermfg=white guifg=white
cterm=none gui=none
hi Todo ctermbg=bg guibg=bg ctermfg=#aa0000 guifg=#aa0000 cterm=none
gui=none
"--------------------------------------------------------------------
" Name Of File: brookstream.vim.
" Description: Gvim colorscheme, works best with version 6.1 cterm .
" Maintainer: Peter B�ckstr�m.
" Creator: Peter B�ckstr�m.
" URL: http://www.brookstream.org (Swedish).
" Credits: Inspiration from the darkdot scheme.
" Last Change: Friday, April 13, 2003.
" Installation: Drop this file in your $VIMRUNTIME/colors/ directory.
"--------------------------------------------------------------------
set background=dark
hi clear
if exists("syntax_on")
syntax reset
endif
let g:colors_name="brookstream-rgb"
"--------------------------------------------------------------------
hi Normal gui=none cterm=none ctermbg=#000000 guibg=#000000
ctermfg=#bbbbbb guifg=#bbbbbb
hi Cursor ctermbg=#44ff44 guibg=#44ff44
ctermfg=#000000 guifg=#000000
hi Directory
ctermfg=#44ffff guifg=#44ffff
hi DiffAdd ctermbg=#080808 guibg=#080808
ctermfg=#ffff00 guifg=#ffff00
hi DiffDelete ctermbg=#080808 guibg=#080808
ctermfg=#444444 guifg=#444444
hi DiffChange ctermbg=#080808 guibg=#080808
ctermfg=#ffffff guifg=#ffffff
hi DiffText ctermbg=#080808 guibg=#080808
ctermfg=#bb0000 guifg=#bb0000
hi ErrorMsg ctermbg=#880000 guibg=#880000
ctermfg=#ffffff guifg=#ffffff
hi Folded
ctermfg=#000088 guifg=#000088
hi IncSearch ctermbg=#000000 guibg=#000000
ctermfg=#bbcccc guifg=#bbcccc
hi LineNr ctermbg=#050505 guibg=#050505
ctermfg=#4682b4 guifg=#4682b4
hi ModeMsg
ctermfg=#ffffff guifg=#ffffff
hi MoreMsg
ctermfg=#44ff44 guifg=#44ff44
hi NonText
ctermfg=#4444ff guifg=#4444ff
hi Question
ctermfg=#ffff00 guifg=#ffff00
hi SpecialKey
ctermfg=#4444ff guifg=#4444ff
hi StatusLine gui=none cterm=none ctermbg=#2f4f4f guibg=#2f4f4f
ctermfg=#ffffff guifg=#ffffff
hi StatusLineNC gui=none cterm=none ctermbg=#bbbbbb guibg=#bbbbbb
ctermfg=#000000 guifg=#000000
hi Title
ctermfg=#ffffff guifg=#ffffff
hi Visual gui=none cterm=none ctermbg=#bbbbbb guibg=#bbbbbb
ctermfg=#000000 guifg=#000000
hi WarningMsg
ctermfg=#ffff00 guifg=#ffff00
" syntax highlighting groups ----------------------------------------
hi Comment
ctermfg=#696969 guifg=#696969
hi Constant
ctermfg=#00aaaa guifg=#00aaaa
hi Identifier
ctermfg=#00e5ee guifg=#00e5ee
hi Statement
ctermfg=#00ffff guifg=#00ffff
hi PreProc
ctermfg=#8470ff guifg=#8470ff
hi Type
ctermfg=#ffffff guifg=#ffffff
hi Special gui=none cterm=none
ctermfg=#87cefa guifg=#87cefa
hi Underlined gui=bold cterm=bold
ctermfg=#4444ff guifg=#4444ff
hi Ignore
ctermfg=#444444 guifg=#444444
hi Error ctermbg=#000000 guibg=#000000
ctermfg=#bb0000 guifg=#bb0000
hi Todo ctermbg=#aa0006 guibg=#aa0006
ctermfg=#fff300 guifg=#fff300
hi Operator gui=none cterm=none
ctermfg=#00bfff guifg=#00bfff
hi Function
ctermfg=#1e90ff guifg=#1e90ff
hi String gui=none cterm=none
ctermfg=#4682b4 guifg=#4682b4
hi Boolean
ctermfg=#9bcd9b guifg=#9bcd9b
