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path: root/plugin/statusline.vim
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scriptencoding utf-8

augroup MAX_FANCYLINE
    set noshowmode    | " mode would otherwise be shown twice- in lightline and below. We want to deactivate one.
    set laststatus=2  | " required by AirLine and Lightline, without status line does not appear until a window split

    let g:status_sym_start         = ''
    let g:status_sym_end           = ''
    let g:status_sym_sep_start     = '│'
    let g:status_sym_sep_end       = '│'
    let g:symbol_branch            = ''
    let g:symbol_screen_edge       = '░'

    if &term ==? 'linux'
        let g:group_active         = 'StatusLineTerm'
        let g:group_inactive       = 'StatusLineTermNC'
        let g:group_tabline        = 'TabLine'
    else
        let g:group_active         = 'StatusLine'
        let g:group_inactive       = 'StatusLineNC'
        let g:group_tabline        = 'TabLine'
    endif

    " this function reverts foreground color and background color of a given
    " highlight group and returns the name of a newly created _invert group
    function! CreateInvertGroup(highlight_group)
        if(synIDattr(synIDtrans(hlID(a:highlight_group)), 'reverse', 'gui')==1)
            let w:color=synIDattr(hlID(a:highlight_group), 'fg#')
        else
            let w:color=synIDattr(hlID(a:highlight_group), 'bg#')
        endif

        let l:retval=a:highlight_group.'_invert'
        if(exists('w:color') && w:color ==# '')
            let w:color = 'NONE'
        endif
        silent! exec 'highlight '.l:retval.' guifg='.w:color.' ctermfg='.w:color
        return l:retval
    endfunction

    function! UpdateStatus(highlight_group)
        let l:invert_group = CreateInvertGroup(a:highlight_group)
        let l:mode = get({
                    \  'n'      : 'normal',
                    \  'i'      : 'insert',
                    \  'R'      : 'replace',
                    \  'v'      : 'visual',
                    \  'V'      : 'visual line',
                    \  "\<C-V>" : 'visual block',
                    \  'c'      : 'command',
                    \  's'      : 'select',
                    \  'S'      : 'select line',
                    \  "\<C-s>" : 'select block',
                    \  't'      : 'terminal'
                    \ }, mode(), mode())
        return ''
                    \ .'%#StatusLineHighlight#'
                    \ .'%#'.a:highlight_group.'#'
                    \ .g:symbol_screen_edge
                    \ .'%{&buftype != "" ? " ".&buftype : ""}'
                    \ .' '.l:mode.g:status_sym_sep_start
                    \ .'%{argc() > 1 ? " ".(argidx() + 1).":".argc()." ".g:status_sym_sep_start : ""}'
                    \ .'%{haslocaldir() ? fnamemodify(getcwd(), ":.:~")." " :""}'
                    \ .'%{&readonly ? " 🔒" : ""}'
                    \ .'%{&modified ? " 💾 " : ""}'
                    \ .'%{" [".winbufnr(0)."] "}'
                    \ .'%{bufname("%") == "" ? "" : fnamemodify(expand("%"), ":~:.")}'
                    \ .'%{&titlestring ? has("nvim") ? b:term_title:expand(&titlestring) : "" }'
                    \ .'%{exists("w:quickfix_title") ? w:quickfix_title : ""}'
                    \ .' '
                    \ .'%#'.l:invert_group.'#'
                    \ .g:status_sym_end
                    \ .'%<'
                    \ .''
                    \ .'%='
                    \ .''
                    \ .'%#'.l:invert_group.'#'
                    \ .g:status_sym_start
                    \ .'%#'.a:highlight_group.'#'.' '
                    \ .'%{&buftype == "" ? "" : &buftype." ".g:status_sym_sep_end." "}'
                    \ .'%{&filetype == "" ?  "" :&filetype." ".g:status_sym_sep_end." "}'
                    \ .'%{&spell ? &spelllang." ".g:status_sym_sep_end : ""}'
                    \ .'%{&fileencoding =~ "^$\\|^utf\-8$" ? "" : &fileencoding." ".g:status_sym_sep_end." "}'
                    \ .'%{&fileformat =~ "^$\\|^unix$" ? "" : &fileformat." ".g:status_sym_sep_end}'
                    \ .' '
                    \ .'%cx%-l: '
                    \ .g:status_sym_sep_end
                    \ .' '
                    \ .'%p%% '
                    \ .g:symbol_screen_edge
    endfunction

    function! UpdateTabline(highlight_group)
        let l:invert_group = CreateInvertGroup(a:highlight_group)
        let l:git_branch   = FugitiveHead()
        return ''
                    \ .'%#'.a:highlight_group.'#'
                    \ .g:symbol_screen_edge
                    \ .' '
                    \ .'%#'.a:highlight_group.'#'
                    \ .'%-2( %)'
                    \ .'%{fnamemodify(getcwd(-1), ":~")}'
                    \ .' '
                    \ .'%{FugitiveHead() == "" ? "" : g:status_sym_sep_start." ".g:symbol_branch." ".FugitiveHead()}'
                    \ .' '
                    \ .'%#'.l:invert_group.'#'
                    \ .g:status_sym_end
                    \ .'%<'
                    \ .'%='
                    \ .'%#'.l:invert_group.'#'
                    \ .g:status_sym_start
                    \ .'%(%#'.a:highlight_group.'#%)'
                    \ .' '
                    \ .'%-2(%)'
                    \ .'%(%#'.a:highlight_group.'#%)'
                    \ .'%(%{v:servername} %{v:this_session}%)'
                    \ .g:status_sym_sep_end.' '
                    \ .'%-3(%)'
                    \ .'%#'.a:highlight_group.'#'
                    \ .'%{tabpagenr()}/%{tabpagenr()}'
                    \ .' '
                    \ .g:symbol_screen_edge
                    \ .'%##'
    endfunction


    if $USER ==? 'root'
        let invert_group = CreateInvertGroup("ErrorMsg")
        let g:group_tabline = invert_group
    endif

    function! ApplyColorScheme()
        " set termguicolors | " When on, uses highlight-guifg and highlight-guibg attributes in the terminal (=24bit color) incompatible with nvim
        " set t_ut=
        " set up statusline, global and current window individually
        set statusline=%!UpdateStatus(g:group_inactive)
        setlocal statusline=%!UpdateStatus(g:group_active)
        " set up the tabline (match colors)
        set tabline=%!UpdateTabline(g:group_tabline)

        " otherwise 'bold' can mess up icon sizes and I do not know why
        highlight! StatusLine cterm=reverse
        " exec 'highlight! User3 guifg=#D2A032 guibg='.l:fgcolor
    endfunction
    call ApplyColorScheme()

    " apply colors from the loaded colorscheme...
    " when changing the colorscheme also apply new colors to the statusbar...
    autocmd ColorScheme  * call ApplyColorScheme()
    autocmd WinEnter    * setlocal statusline=%!UpdateStatus(g:group_active)
    autocmd WinLeave    * setlocal statusline<
augroup END " MAX_FANCYLINE
..