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1 README.txt for color scheme files
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2
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3 These files are used for the ":colorscheme" command. They appear in the
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4 Edit/Color Scheme menu in the GUI.
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5
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6
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7 Hints for writing a color scheme file:
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8
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9 There are two basic ways to define a color scheme:
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10
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11 1. Define a new Normal color and set the 'background' option accordingly.
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12 set background={light or dark}
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13 highlight clear
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14 highlight Normal ...
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15 ...
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16
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17 2. Use the default Normal color and automatically adjust to the value of
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18 'background'.
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19 highlight clear Normal
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20 set background&
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21 highlight clear
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22 if &background == "light"
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23 highlight Error ...
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24 ...
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25 else
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26 highlight Error ...
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27 ...
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28 endif
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29
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30 You can use ":highlight clear" to reset everything to the defaults, and then
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31 change the groups that you want differently. This also will work for groups
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32 that are added in later versions of Vim.
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33 Note that ":highlight clear" uses the value of 'background', thus set it
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34 before this command.
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35 Some attributes (e.g., bold) might be set in the defaults that you want
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36 removed in your color scheme. Use something like "gui=NONE" to remove the
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37 attributes.
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38
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39 In case you want to set 'background' depending on the colorscheme selected,
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40 this autocmd might be useful:
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41 autocmd SourcePre */colors/blue_sky.vim set background=dark
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42 Replace "blue_sky" with the name of the colorscheme.
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43
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44 In case you want to tweak a colorscheme after it was loaded, check out that
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45 ColorScheme autocmd event.
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46
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47 To see which highlight group is used where, find the help for
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48 "highlight-groups" and "group-name".
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49
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50 You can use ":highlight" to find out the current colors. Exception: the
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51 ctermfg and ctermbg values are numbers, which are only valid for the current
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52 terminal. Use the color names instead. See ":help cterm-colors".
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53
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54 The default color settings can be found in the source file src/syntax.c.
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55 Search for "highlight_init".
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56
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57 If you think you have a color scheme that is good enough to be used by others,
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58 please check the following items:
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59
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60 - Does it work in a color terminal as well as in the GUI?
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1622
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61 - Is "g:colors_name" set to a meaningful value? In case of doubt you can do
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62 it this way:
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63 let g:colors_name = expand('<sfile>:t:r')
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64 - Is 'background' either used or appropriately set to "light" or "dark"?
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65 - Try setting 'hlsearch' and searching for a pattern, is the match easy to
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66 spot?
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67 - Split a window with ":split" and ":vsplit". Are the status lines and
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68 vertical separators clearly visible?
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69 - In the GUI, is it easy to find the cursor, also in a file with lots of
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70 syntax highlighting?
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71 - Do not use hard coded escape sequences, these will not work in other
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72 terminals. Always use color names or #RRGGBB for the GUI.
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