Re: Please explain highlight groups User1 ... User9!!!

On Wed, May 10, 2017 at 12:59 AM, <jrfranklin@georgiasouthern.edu> wrote:
> Hello All,
>
> I've been trying to master my statusline customizations, and I've hit a wall in the application of colors to the statusline.
>
> The documentation suggests to use the User1 to User9 highlight groups. Quoting from ":h 'statusline'":
>
> > * - Set highlight group to User{N}, where {N} is taken from the
> > minwid field, e.g. %1*. Restore normal highlight with %* or %0*.
> > The difference between User{N} and StatusLine will be applied
> > to StatusLineNC for the statusline of non-current windows.
> > The number N must be between 1 and 9. See |hl-User1..9|
>
> This just seems cryptic to me. When I define User1 with the ":highlight" command, I would expect Vim to automatically adjust my highlighting to indicate an inactive window (based on the statements above). However, in Vim 7.4, the highlighting is the same for all windows. I use GVim 8 at work, and the colors appear to adjust, but I'm just not sure that I'm even using the feature correctly.
>
> Should I expect automatic adjustment of my User1 color in the statusline (using the "%*1" format spec)?
>
> I'm tremendously confused about this feature and would love nothing more than to feel once-again in control of my statusline!!!
>
> Thanks to all!
> Jason

Highlight groups (all of them) are indeed global. Using the :hi
command with no arguments displays them all — there are a lot of them.
You may change them depending on context by *carefully* setting
autocommands in your owncoded colorscheme. Here is an example from
mine, sorry if it may seem longish. The autocommands are at the end
but they use what comes above it. Notice the "uninstall" autocommand
at the bottom for when the user sets a different colorscheme.
(g:CSApprox_approximator_function is a Funcref defined by the CSApprox
plugin.)

" display the status line of the active window in a distinctive color:
" bold black on bright red in the GUI, white on green in the console
" (where the bg is never bright, and dark red is sometimes an ugly sort
" of reddish brown).
hi StatusLine gui=NONE,bold guibg=red guifg=black
\ cterm=NONE,bold ctermbg=darkgreen ctermfg=white
hi WildMenu gui=NONE,bold guibg=#00FF00 guifg=black
\ cterm=NONE,bold ctermbg=black ctermfg=white
" make the status line bold-reverse (but B&W) for inactive windows
hi StatusLineNC gui=reverse,bold
\ cterm=NONE ctermbg=black ctermfg=lightgrey
" make the active status line colours alternate between two settings
" to give a visual notice of the CursorHold/CursorHoldI events
if ! exists("s:statuslineflag")
let s:statuslineflag = 0
endif
"
" The following 'fancy footwork' is needed to have our CursorHold autocommand
" work smoothly with 256-color cterms handled by the 3rd-party
csapprox.vim plugin
if exists('g:CSApprox_approximator_function')
let s:ctbg1 = g:CSApprox_approximator_function(0, 255, 0) " green
let s:ctbg2 = g:CSApprox_approximator_function(255, 0, 0) " red
let s:ctfg = g:CSApprox_approximator_function(0, 0, 0) " black
else
let s:ctbg1 = 'darkgreen'
let s:ctbg2 = 'black'
let s:ctfg = 'white'
endif

function! ToggleStatusLine()
if s:statuslineflag
exe 'hi StatusLine'
\ 'cterm=NONE,bold ctermbg=' . s:ctbg1 'ctermfg=' . s:ctfg
\ 'gui=NONE,bold guibg=#00FF00 guifg=black'
exe 'hi WildMenu'
\ 'cterm=NONE,bold ctermbg=' . s:ctbg2 'ctermfg=' . s:ctfg
\ 'gui=NONE,bold guibg=red guifg=black'
else
exe 'hi StatusLine'
\ 'cterm=NONE,bold ctermbg=' . s:ctbg2 'ctermfg=' . s:ctfg
\ 'gui=NONE,bold guibg=red guifg=black'
exe 'hi WildMenu'
\ 'cterm=NONE,bold ctermbg=' . s:ctbg1 'ctermfg=' . s:ctfg
\ 'gui=NONE,bold guibg=#00FF00 guifg=black'
endif
let s:statuslineflag = ! s:statuslineflag
endfunction

exe "augroup" s:colors_name
au! CursorHold,CursorHoldI * call ToggleStatusLine()
au! ColorScheme *
\ if g:colors_name != s:colors_name | exe "au!" s:colors_name | endif
augroup END

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