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README.txt for color scheme files
These files are used for the ":colorscheme" command. They appear in the
Edit/Color Scheme menu in the GUI.
Hints for writing a color scheme file:
There are two basic ways to define a color scheme:
1. Define a new Normal color and set the 'background' option accordingly.
set background={light or dark}
highlight clear
highlight Normal ...
...
2. Use the default Normal color and automatically adjust to the value of
'background'.
highlight clear Normal
set background&
highlight clear
if &background == "light"
highlight Error ...
...
else
highlight Error ...
...
endif
You can use ":highlight clear" to reset everything to the defaults, and then
change the groups that you want differently. This also will work for groups
that are added in later versions of Vim.
Note that ":highlight clear" uses the value of 'background', thus set it
before this command.
Some attributes (e.g., bold) might be set in the defaults that you want
removed in your color scheme. Use something like "gui=NONE" to remove the
attributes.
To see which highlight group is used where, find the help for
"highlight-groups" and "group-name".
You can use ":highlight" to find out the current colors. Exception: the
ctermfg and ctermbg values are numbers, which are only valid for the current
terminal. Use the color names instead. See ":help cterm-colors".
The default color settings can be found in the source file src/syntax.c.
Search for "highlight_init".
If you think you have a color scheme that is good enough to be used by others,
please check the following items:
- Does it work in a color terminal as well as in the GUI?
- Is 'background' either used or appropriately set to "light" or "dark"?
- Try setting 'hlsearch' and searching for a pattern, is the match easy to
spot?
- Split a window with ":split" and ":vsplit". Are the status lines and
vertical separators clearly visible?
- In the GUI, is it easy to find the cursor, also in a file with lots of
syntax highlighting?
- Do not use hard coded escape sequences, these will not work in other
terminals. Always use color names or #RRGGBB for the GUI.
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