Vim: StatusLine & Help

statusline-help.vim

" Statusline {{{
  " Functions {{{
    " Statusline updater {{{
    " Inspired by StatusLineHighlight by Ingo Karkat
      function! s:StatusLine(new_stl, type, current)
        let current = (a:current ? "" : "NC")
        let type = a:type
        let new_stl = a:new_stl

        " Prepare current buffer specific text
        " Syntax: <CUR> ... </CUR>
        let new_stl = substitute(new_stl, '<CUR>\(.\{-,}\)</CUR>', (a:current ? '\1' : ''), 'g')

        " Prepare statusline colors
        " Syntax: #[ ... ]
        let new_stl = substitute(new_stl, '#\[\(\w\+\)\]', '%#StatusLine'.type.'\1'.current.'#', 'g')

        if &l:statusline ==# new_stl
          " Statusline already set, nothing to do
          return
        endif

        if empty(&l:statusline)
          " No statusline is set, use my_stl
          let &l:statusline = new_stl
        else
          " Check if a custom statusline is set
          let plain_stl = substitute(&l:statusline, '%#StatusLine\w\+#', '', 'g')

          if &l:statusline ==# plain_stl
            " A custom statusline is set, don't modify
            return
          endif

          " No custom statusline is set, use my_stl
          let &l:statusline = new_stl
        endif
      endfunction
    " }}}
    " Color dict parser {{{
    function! s:StatusLineColors(colors)
      for type in keys(a:colors)
        for name in keys(a:colors[type])
          let colors = {'c': a:colors[type][name][0], 'nc': a:colors[type][name][1]}
          let type = (type == 'NONE' ? '' : type)
          let name = (name == 'NONE' ? '' : name)

          if exists("colors['c'][0]")
            exec 'hi StatusLine'.type.name.' ctermbg='.colors['c'][0].' ctermfg='.colors['c'][1].' cterm='.colors['c'][2]
          endif

          if exists("colors['nc'][0]")
            exec 'hi StatusLine'.type.name.'NC ctermbg='.colors['nc'][0].' ctermfg='.colors['nc'][1].' cterm='.colors['nc'][2]
          endif
        endfor
      endfor
    endfunction
    " }}}
  " }}}
  " Default statusline {{{
    let g:default_stl  = ""
    let g:default_stl .= "<CUR>#[Mode] %{&paste ? 'PASTE  ' : ''}%{substitute(mode(), '', '', 'g')} #[ModeS]</CUR>"
    let g:default_stl .= "#[ModFlag]%{&readonly ? 'RO ' : ''}" " RO flag
    let g:default_stl .= " #[FileName]%t " " File name
    let g:default_stl .= "#[ModFlag]%(%M %)" " Modified flag
    let g:default_stl .= "#[BufFlag]%(%H%W %)" " HLP,PRV flags
    let g:default_stl .= "#[FileNameS] " " Separator
    let g:default_stl .= "#[FunctionName] " " Padding/HL group
    let g:default_stl .= "%<" " Truncate right
    let g:default_stl .= "%= " " Right align
    let g:default_stl .= "<CUR>#[FileFormat]%{&fileformat} </CUR>" " File format
    let g:default_stl .= "<CUR>#[FileEncoding]%{(&fenc == '' ? &enc : &fenc)} </CUR>" " File encoding
    let g:default_stl .= "<CUR>#[Separator]  ⊂ #[FileType]%{strlen(&ft) ? &ft : 'n/a'} </CUR>" " File type
    let g:default_stl .= "#[LinePercentS] #[LinePercent] %p%% " " Line/column/virtual column, Line percentage
    let g:default_stl .= "#[LineNumberS] #[LineNumber]  %l#[LineColumn]:%c%V " " Line/column/virtual column, Line percentage
    let g:default_stl .= "%{exists('g:synid') && g:synid ? ' '.synIDattr(synID(line('.'), col('.'), 1), 'name').' ' : ''}" " Current syntax group
  " }}}
  " Color dict {{{
    let s:statuscolors = {
      \   'NONE': {
        \   'NONE'         : [[ 236, 231, 'bold'], [ 232, 244, 'none']]
      \ }
      \ , 'Normal': {
        \   'Mode'         : [[ 214, 235, 'bold'], [                 ]]
        \ , 'ModeS'        : [[ 214, 240, 'bold'], [                 ]]
        \ , 'Branch'       : [[ 240, 250, 'none'], [ 234, 239, 'none']]
        \ , 'BranchS'      : [[ 240, 246, 'none'], [ 234, 239, 'none']]
        \ , 'FileName'     : [[ 240, 231, 'bold'], [ 234, 244, 'none']]
        \ , 'FileNameS'    : [[ 240, 236, 'bold'], [ 234, 232, 'none']]
        \ , 'Error'        : [[ 240, 202, 'bold'], [ 234, 239, 'none']]
        \ , 'ModFlag'      : [[ 240, 196, 'bold'], [ 234, 239, 'none']]
        \ , 'BufFlag'      : [[ 240, 250, 'none'], [ 234, 239, 'none']]
        \ , 'FunctionName' : [[ 236, 247, 'none'], [ 232, 239, 'none']]
        \ , 'FileFormat'   : [[ 236, 244, 'none'], [ 232, 239, 'none']]
        \ , 'FileEncoding' : [[ 236, 244, 'none'], [ 232, 239, 'none']]
        \ , 'Separator'    : [[ 236, 242, 'none'], [ 232, 239, 'none']]
        \ , 'FileType'     : [[ 236, 248, 'none'], [ 232, 239, 'none']]
        \ , 'LinePercentS' : [[ 240, 236, 'none'], [ 234, 232, 'none']]
        \ , 'LinePercent'  : [[ 240, 250, 'none'], [ 234, 239, 'none']]
        \ , 'LineNumberS'  : [[ 252, 240, 'bold'], [ 234, 234, 'none']]
        \ , 'LineNumber'   : [[ 252, 236, 'bold'], [ 234, 244, 'none']]
        \ , 'LineColumn'   : [[ 252, 240, 'none'], [ 234, 239, 'none']]
      \ }
      \ , 'Insert': {
        \   'Mode'         : [[ 153,  23, 'bold'], [                 ]]
        \ , 'ModeS'        : [[ 153,  31, 'bold'], [                 ]]
        \ , 'Branch'       : [[  31, 117, 'none'], [                 ]]
        \ , 'BranchS'      : [[  31, 117, 'none'], [                 ]]
        \ , 'FileName'     : [[  31, 231, 'bold'], [                 ]]
        \ , 'FileNameS'    : [[  31,  24, 'bold'], [                 ]]
        \ , 'Error'        : [[  31, 202, 'bold'], [                 ]]
        \ , 'ModFlag'      : [[  31, 196, 'bold'], [                 ]]
        \ , 'BufFlag'      : [[  31,  75, 'none'], [                 ]]
        \ , 'FunctionName' : [[  24, 117, 'none'], [                 ]]
        \ , 'FileFormat'   : [[  24,  75, 'none'], [                 ]]
        \ , 'FileEncoding' : [[  24,  75, 'none'], [                 ]]
        \ , 'Separator'    : [[  24,  37, 'none'], [                 ]]
        \ , 'FileType'     : [[  24,  81, 'none'], [                 ]]
        \ , 'LinePercentS' : [[  31,  24, 'none'], [                 ]]
        \ , 'LinePercent'  : [[  31, 117, 'none'], [                 ]]
        \ , 'LineNumberS'  : [[ 117,  31, 'bold'], [                 ]]
        \ , 'LineNumber'   : [[ 117,  23, 'bold'], [                 ]]
        \ , 'LineColumn'   : [[ 117,  31, 'none'], [                 ]]
      \ }
    \ }
  " }}}
" }}}

" Statusline highlighting {{{
augroup StatusLineHighlight
  autocmd!
  let s:round_stl = 0
  au ColorScheme * call <SID>StatusLineColors(s:statuscolors)
  au BufEnter,BufWinEnter,WinEnter,CmdwinEnter,CursorHold,BufWritePost,InsertLeave * call <SID>StatusLine((exists('b:stl') ? b:stl : g:default_stl), 'Normal', 1)
  au BufLeave,BufWinLeave,WinLeave,CmdwinLeave * call <SID>StatusLine((exists('b:stl') ? b:stl : g:default_stl), 'Normal', 0)
  au InsertEnter,CursorHoldI * call <SID>StatusLine((exists('b:stl') ? b:stl : g:default_stl), 'Insert', 1)
augroup END
" }}}

augroup General " {{{
  autocmd!
  " Help file settings {{{
  function! s:SetupHelpWindow()
    wincmd L
    vertical resize 80
    setl nonumber winfixwidth colorcolumn=
    let b:stl = "#[Branch] HELP#[BranchS] [>] #[FileName]%<%t #[FileNameS][>>]%* %=#[LinePercentS][<<]#[LinePercent] %p%% " " Set custom statusline
    nnoremap <buffer> <Space> <C-]> " Space selects subject
    nnoremap <buffer> <BS>    <C-T> " Backspace to go back
  endfunction
  au FileType help au BufEnter,BufWinEnter <buffer> call <SID>SetupHelpWindow()
  " }}}
augroup END " }}}