" MIT License. Copyright (c) 2013-2021 Bailey Ling et al.
" vim: et ts=2 sts=2 sw=2 et

scriptencoding utf-8

let s:taboo = get(g:, 'airline#extensions#taboo#enabled', 1) && get(g:, 'loaded_taboo', 0)
if s:taboo
  let g:taboo_tabline = 0
endif

let s:ctrlspace = get(g:, 'CtrlSpaceLoaded', 0)
let s:tabws = get(g:, 'tabws_loaded', 0)
let s:current_tabcnt = -1

function! airline#extensions#tabline#init(ext)
  if has('gui_running') && match(&guioptions, 'e') > -1
    set guioptions-=e
  endif

  autocmd User AirlineToggledOn call s:toggle_on()
  autocmd User AirlineToggledOff call s:toggle_off()

  call s:toggle_on()
  call a:ext.add_theme_func('airline#extensions#tabline#load_theme')
endfunction

function! airline#extensions#tabline#add_label(dict, type, right)
  if get(g:, 'airline#extensions#tabline#show_tab_type', 1)
    call a:dict.add_section_spaced('airline_tablabel'. (a:right ? '_right' : ''),
          \ get(g:, 'airline#extensions#tabline#'.a:type.'_label', a:type))
  endif
endfunction

function! airline#extensions#tabline#add_tab_label(dict)
  let show_tab_count = get(g:, 'airline#extensions#tabline#show_tab_count', 1)
  if show_tab_count == 2
    call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
  elseif show_tab_count == 1 && tabpagenr('$') > 1
    call a:dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
  endif
endfunction


if !exists(":def") || (exists(":def") && get(g:, "airline_experimental", 0) == 0)

  " Legacy Vim Script Implementation

  function! s:toggle_off()
    call airline#extensions#tabline#autoshow#off()
    call airline#extensions#tabline#tabs#off()
    call airline#extensions#tabline#buffers#off()
    if s:ctrlspace
      call airline#extensions#tabline#ctrlspace#off()
    endif
    if s:tabws
      call airline#extensions#tabline#tabws#off()
    endif
  endfunction

  function! s:toggle_on()
    if get(g:, 'airline_statusline_ontop', 0)
      call airline#extensions#tabline#enable()
      let &tabline='%!airline#statusline('.winnr().')'
      return
    endif
    call airline#extensions#tabline#autoshow#on()
    call airline#extensions#tabline#tabs#on()
    call airline#extensions#tabline#buffers#on()
    if s:ctrlspace
      call airline#extensions#tabline#ctrlspace#on()
    endif
    if s:tabws
      call airline#extensions#tabline#tabws#on()
    endif

    set tabline=%!airline#extensions#tabline#get()
  endfunction

  function! airline#extensions#tabline#load_theme(palette)
    if pumvisible()
      return
    endif
    let colors    = get(a:palette, 'tabline', {})
    let tablabel  = get(colors, 'airline_tablabel', a:palette.normal.airline_b)
    " Theme for tabs on the left
    let tab     = get(colors, 'airline_tab', a:palette.inactive.airline_c)
    let tabsel  = get(colors, 'airline_tabsel', a:palette.normal.airline_a)
    let tabtype = get(colors, 'airline_tabtype', a:palette.visual.airline_a)
    let tabfill = get(colors, 'airline_tabfill', a:palette.normal.airline_c)
    let tabmod  = get(colors, 'airline_tabmod', a:palette.insert.airline_a)
    let tabhid  = get(colors, 'airline_tabhid', a:palette.normal.airline_c)
    if has_key(a:palette, 'normal_modified') && has_key(a:palette.normal_modified, 'airline_c')
      let tabmodu = get(colors, 'airline_tabmod_unsel', a:palette.normal_modified.airline_c)
      let tabmodu_right = get(colors, 'airline_tabmod_unsel_right', a:palette.normal_modified.airline_c)
    else
      "Fall back to normal airline_c if modified airline_c isn't present
      let tabmodu = get(colors, 'airline_tabmod_unsel', a:palette.normal.airline_c)
      let tabmodu_right = get(colors, 'airline_tabmod_unsel_right', a:palette.normal.airline_c)
    endif
    call airline#highlighter#exec('airline_tablabel', tablabel)
    call airline#highlighter#exec('airline_tab', tab)
    call airline#highlighter#exec('airline_tabsel', tabsel)
    call airline#highlighter#exec('airline_tabtype', tabtype)
    call airline#highlighter#exec('airline_tabfill', tabfill)
    call airline#highlighter#exec('airline_tabmod', tabmod)
    call airline#highlighter#exec('airline_tabmod_unsel', tabmodu)
    call airline#highlighter#exec('airline_tabhid', tabhid)

    " Theme for tabs on the right
    " label on the right
    let tablabel_r  = get(colors, 'airline_tablabel', a:palette.normal.airline_b)
    let tabsel_right  = get(colors, 'airline_tabsel_right', a:palette.normal.airline_a)
    let tab_right     = get(colors, 'airline_tab_right',    a:palette.inactive.airline_c)
    let tabmod_right  = get(colors, 'airline_tabmod_right', a:palette.insert.airline_a)
    let tabhid_right  = get(colors, 'airline_tabhid_right', a:palette.normal.airline_c)
    call airline#highlighter#exec('airline_tablabel_right', tablabel_r)
    call airline#highlighter#exec('airline_tab_right',    tab_right)
    call airline#highlighter#exec('airline_tabsel_right', tabsel_right)
    call airline#highlighter#exec('airline_tabmod_right', tabmod_right)
    call airline#highlighter#exec('airline_tabhid_right', tabhid_right)
    call airline#highlighter#exec('airline_tabmod_unsel_right', tabmodu_right)
  endfunction

  function! s:update_tabline(forceit)
    if get(g:, 'airline#extensions#tabline#disable_refresh', 0)
      return
    endif
    " loading a session file
    " On SessionLoadPost, g:SessionLoad variable is still set :/
    if !a:forceit && get(g:, 'SessionLoad', 0)
      return
    endif
    let match = expand('<afile>')
    if pumvisible()
      return
    elseif !get(g:, 'airline#extensions#tabline#enabled', 0)
      return
    " return, if buffer matches ignore pattern or is directory (netrw)
    elseif empty(match) || airline#util#ignore_buf(match) || isdirectory(match)
      return
    endif
    call airline#util#doautocmd('BufMRUChange')
    call airline#extensions#tabline#redraw()
  endfunction

  function! airline#extensions#tabline#redraw()
    " sometimes, the tabline is not correctly updated see #1580
    " so force redraw here
    if exists(":redrawtabline") == 2
      redrawtabline
    else
    " Have to set a property equal to itself to get airline to re-eval.
    " Setting `let &tabline=&tabline` destroys the cursor position so we
    " need something less invasive.
      let &ro = &ro
    endif
  endfunction

  function! airline#extensions#tabline#enable()
    if &lines > 3
      set showtabline=2
    endif
  endfunction


  function! airline#extensions#tabline#get()
    let show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
    let show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)

    let curtabcnt = tabpagenr('$')
    if curtabcnt != s:current_tabcnt
      let s:current_tabcnt = curtabcnt
      call airline#extensions#tabline#tabs#invalidate()
      call airline#extensions#tabline#buffers#invalidate()
      call airline#extensions#tabline#ctrlspace#invalidate()
      call airline#extensions#tabline#tabws#invalidate()
    endif

    if !exists('#airline#BufAdd#*')
      autocmd airline BufAdd * call <sid>update_tabline(0)
    endif
    if !exists('#airline#SessionLoadPost')
      autocmd airline SessionLoadPost * call <sid>update_tabline(1)
    endif
    if s:ctrlspace
      return airline#extensions#tabline#ctrlspace#get()
    elseif s:tabws
      return airline#extensions#tabline#tabws#get()
    elseif show_buffers && curtabcnt == 1 || !show_tabs
      return airline#extensions#tabline#buffers#get()
    else
      return airline#extensions#tabline#tabs#get()
    endif
  endfunction

  function! airline#extensions#tabline#title(n)
    let title = ''
    if s:taboo
      let title = TabooTabTitle(a:n)
    endif

    if empty(title) && exists('*gettabvar')
      let title = gettabvar(a:n, 'title')
    endif

    let formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter')
    if empty(title) && formatter !=# '' && exists("*".formatter)
      let title = call(formatter, [a:n])
    endif

    if empty(title)
      let buflist = tabpagebuflist(a:n)
      let winnr = tabpagewinnr(a:n)
      let all_buffers = airline#extensions#tabline#buflist#list()
      let curbuf = filter(buflist, 'index(all_buffers, v:val) != -1')
      if len(curbuf) ==  0
        call add(curbuf, tabpagebuflist()[0])
      endif
      return airline#extensions#tabline#get_buffer_name(curbuf[0], curbuf)
    endif

    return title
  endfunction

  function! airline#extensions#tabline#get_buffer_name(nr, ...)
    let buffers = a:0 ? a:1 : airline#extensions#tabline#buflist#list()
    let formatter = get(g:, 'airline#extensions#tabline#formatter', 'default')
    return airline#extensions#tabline#formatters#{formatter}#format(a:nr, buffers)
  endfunction

  function! airline#extensions#tabline#new_builder()
    let builder_context = {
          \ 'active'        : 1,
          \ 'tabline'       : 1,
          \ 'right_sep'     : get(g:, 'airline#extensions#tabline#right_sep'    , g:airline_right_sep),
          \ 'right_alt_sep' : get(g:, 'airline#extensions#tabline#right_alt_sep', g:airline_right_alt_sep),
          \ }
    if get(g:, 'airline_powerline_fonts', 0)
      let builder_context.left_sep     = get(g:, 'airline#extensions#tabline#left_sep'     , g:airline_left_sep)
      let builder_context.left_alt_sep = get(g:, 'airline#extensions#tabline#left_alt_sep' , g:airline_left_alt_sep)
    else
      let builder_context.left_sep     = get(g:, 'airline#extensions#tabline#left_sep'     , ' ')
      let builder_context.left_alt_sep = get(g:, 'airline#extensions#tabline#left_alt_sep' , '|')
    endif

    return airline#extensions#tabline#builder#new(builder_context)
  endfunction

  function! airline#extensions#tabline#group_of_bufnr(tab_bufs, bufnr)
    let cur = bufnr('%')
    if cur == a:bufnr
      if g:airline_detect_modified && getbufvar(a:bufnr, '&modified')
        let group = 'airline_tabmod'
      else
        let group = 'airline_tabsel'
      endif
    else
      if g:airline_detect_modified && getbufvar(a:bufnr, '&modified')
        let group = 'airline_tabmod_unsel'
      elseif index(a:tab_bufs, a:bufnr) > -1
        let group = 'airline_tab'
      else
        let group = 'airline_tabhid'
      endif
    endif
    return group
  endfunction

else

  " Vim9 Script implementation
  def s:toggle_off(): void
    airline#extensions#tabline#autoshow#off()
    airline#extensions#tabline#tabs#off()
    airline#extensions#tabline#buffers#off()
    if s:ctrlspace
      airline#extensions#tabline#ctrlspace#off()
    endif
    if s:tabws
      airline#extensions#tabline#tabws#off()
    endif
  enddef

  def s:toggle_on(): void
    if get(g:, 'airline_statusline_ontop', 0)
      airline#extensions#tabline#enable()
      &tabline = '%!airline#statusline(' .. winnr() .. ')'
      return
    endif
    airline#extensions#tabline#autoshow#on()
    airline#extensions#tabline#tabs#on()
    airline#extensions#tabline#buffers#on()
    if s:ctrlspace
      airline#extensions#tabline#ctrlspace#on()
    endif
    if s:tabws
      airline#extensions#tabline#tabws#on()
    endif
    &tabline = '%!airline#extensions#tabline#get()'
  enddef

  def airline#extensions#tabline#load_theme(palette: dict<any>): number
    # Needs to return a number, because it is implicitly used as extern_funcref
    # And funcrefs should return a value (see airline#util#exec_funcrefs())
    if pumvisible()
      return 0
    endif
    var colors    = get(palette, 'tabline', {})
    var tablabel  = get(colors, 'airline_tablabel', palette.normal.airline_b)
    # Theme for tabs on the left
    var tab     = get(colors, 'airline_tab', palette.inactive.airline_c)
    var tabsel  = get(colors, 'airline_tabsel', palette.normal.airline_a)
    var tabtype = get(colors, 'airline_tabtype', palette.visual.airline_a)
    var tabfill = get(colors, 'airline_tabfill', palette.normal.airline_c)
    var tabmod  = get(colors, 'airline_tabmod', palette.insert.airline_a)
    var tabhid  = get(colors, 'airline_tabhid', palette.normal.airline_c)
    var tabmodu = tabhid
    var tabmodu_right = tabhid
    if has_key(palette, 'normal_modified') && has_key(palette.normal_modified, 'airline_c')
      tabmodu = get(colors, 'airline_tabmod_unsel', palette.normal_modified.airline_c)
      tabmodu_right = get(colors, 'airline_tabmod_unsel_right', palette.normal_modified.airline_c)
    else
      # Fall back to normal airline_c if modified airline_c isn't present
      tabmodu = get(colors, 'airline_tabmod_unsel', palette.normal.airline_c)
      tabmodu_right = get(colors, 'airline_tabmod_unsel_right', palette.normal.airline_c)
    endif
    airline#highlighter#exec('airline_tablabel', tablabel)
    airline#highlighter#exec('airline_tab', tab)
    airline#highlighter#exec('airline_tabsel', tabsel)
    airline#highlighter#exec('airline_tabtype', tabtype)
    airline#highlighter#exec('airline_tabfill', tabfill)
    airline#highlighter#exec('airline_tabmod', tabmod)
    airline#highlighter#exec('airline_tabmod_unsel', tabmodu)
    airline#highlighter#exec('airline_tabmod_unsel_right', tabmodu_right)
    airline#highlighter#exec('airline_tabhid', tabhid)
    # Theme for tabs on the right
    var tablabel_r  = get(colors, 'airline_tablabel', palette.normal.airline_b)
    var tabsel_right  = get(colors, 'airline_tabsel_right', palette.normal.airline_a)
    var tab_right     = get(colors, 'airline_tab_right',    palette.inactive.airline_c)
    var tabmod_right  = get(colors, 'airline_tabmod_right', palette.insert.airline_a)
    var tabhid_right  = get(colors, 'airline_tabhid_right', palette.normal.airline_c)
    airline#highlighter#exec('airline_tablabel_right', tablabel_r)
    airline#highlighter#exec('airline_tab_right',    tab_right)
    airline#highlighter#exec('airline_tabsel_right', tabsel_right)
    airline#highlighter#exec('airline_tabmod_right', tabmod_right)
    airline#highlighter#exec('airline_tabhid_right', tabhid_right)
    return 0
  enddef

  def s:update_tabline(forceit: number): void
    if get(g:, 'airline#extensions#tabline#disable_refresh', 0)
      return
    endif
    # loading a session file
    # On SessionLoadPost, g:SessionLoad variable is still set :/
    if !forceit && get(g:, 'SessionLoad', 0)
      return
    endif
    var match = expand('<afile>')
    if pumvisible()
      return
    elseif !get(g:, 'airline#extensions#tabline#enabled', 0)
      return
    # return, if buffer matches ignore pattern or is directory (netrw)
    elseif empty(match) || airline#util#ignore_buf(match) || isdirectory(match)
      return
    endif
    airline#util#doautocmd('BufMRUChange')
    airline#extensions#tabline#redraw()
  enddef

  def airline#extensions#tabline#redraw(): void
    # redrawtabline should always be available
    :redrawtabline
  enddef

  def airline#extensions#tabline#enable(): void
    if &lines > 3
      &showtabline = 2
    endif
  enddef


  def airline#extensions#tabline#get(): string
    var show_buffers = get(g:, 'airline#extensions#tabline#show_buffers', 1)
    var show_tabs = get(g:, 'airline#extensions#tabline#show_tabs', 1)

    var curtabcnt = tabpagenr('$')
    if curtabcnt != s:current_tabcnt
      s:current_tabcnt = curtabcnt
      airline#extensions#tabline#tabs#invalidate()
      airline#extensions#tabline#buffers#invalidate()
      airline#extensions#tabline#ctrlspace#invalidate()
      airline#extensions#tabline#tabws#invalidate()
    endif

    if !exists('#airline#BufAdd#*')
      autocmd airline BufAdd * call <sid>update_tabline(0)
    endif
    if !exists('#airline#SessionLoadPost')
      autocmd airline SessionLoadPost * call <sid>update_tabline(1)
    endif
    if s:ctrlspace
      return airline#extensions#tabline#ctrlspace#get()
    elseif s:tabws
      return airline#extensions#tabline#tabws#get()
    elseif show_buffers && curtabcnt == 1 || !show_tabs
      return airline#extensions#tabline#buffers#get()
    else
      return airline#extensions#tabline#tabs#get()
    endif
  enddef

  def airline#extensions#tabline#title(n: number): string
    var title = ''
    if get(g:, 'airline#extensions#taboo#enabled', 1) &&
      get(g:, 'loaded_taboo', 0) && exists("*TabooTabTitle")
      title = call("TabooTabTitle", [n])
    endif

    if empty(title)
      title = gettabvar(n, 'title')
    endif

    var formatter = get(g:, 'airline#extensions#tabline#tabtitle_formatter', '')
    if empty(title) && !empty(formatter) && exists("*" .. formatter)
      title = call(formatter, [n])
    endif

    if empty(title)
      var buflist = tabpagebuflist(n)
      var winnr = tabpagewinnr(n)
      var all_buffers = airline#extensions#tabline#buflist#list()
      var curbuf = filter(buflist, {_, v -> index(all_buffers, v) != -1})
      if len(curbuf) ==  0
        add(curbuf, tabpagebuflist()[0])
      endif
      return airline#extensions#tabline#get_buffer_name(curbuf[0], curbuf)
    endif
    return title
  enddef

  def airline#extensions#tabline#get_buffer_name(nr: number, buffers = airline#extensions#tabline#buflist#list()): string
    var Formatter = 'airline#extensions#tabline#formatters#' .. get(g:, 'airline#extensions#tabline#formatter', 'default') .. '#format'
    return call(Formatter, [ nr, buffers] )
  enddef

  def airline#extensions#tabline#new_builder(): dict<any>
    var builder_context = {
        'active': 1,
        'tabline': 1,
        'right_sep': get(g:, 'airline#extensions#tabline#right_sep', g:airline_right_sep),
        'right_alt_sep': get(g:, 'airline#extensions#tabline#right_alt_sep', g:airline_right_alt_sep),
        'left_sep': get(g:, 'airline#extensions#tabline#left_sep', g:airline_left_sep),
        'left_alt_sep': get(g:, 'airline#extensions#tabline#left_alt_sep', g:airline_left_alt_sep),
        }
    return airline#extensions#tabline#builder#new(builder_context)
  enddef

  def airline#extensions#tabline#group_of_bufnr(tab_bufs: list<number>, bufnr: number): string
    var cur = bufnr('%')
    var group = ''
    if cur == bufnr
      if g:airline_detect_modified && getbufvar(bufnr, '&modified')
        group = 'airline_tabmod'
      else
        group = 'airline_tabsel'
      endif
    else
      if g:airline_detect_modified && getbufvar(bufnr, '&modified')
        group = 'airline_tabmod_unsel'
      elseif index(tab_bufs, bufnr) > -1
        group = 'airline_tab'
      else
        group = 'airline_tabhid'
      endif
    endif
    return group
  enddef

  " The following two dictionary functions do not work yet :/
  "
  " def airline#extensions#tabline#init(ext: dict<any>): void
  "   if has('gui_running') && match(&guioptions, 'e') > -1
  "     :set guioptions-=e
  "   endif
  "   autocmd User AirlineToggledOn call s:toggle_on()
  "   autocmd User AirlineToggledOff call s:toggle_off()
  "   s:toggle_on()
  "   try
  "     ext.add_theme_func('airline#extensions#tabline#load_theme')
  "   catch
  "   endtry
  " enddef
  "
  " def airline#extensions#tabline#add_label(dict: dict<any>, type: string, right: number): void
  "   # Seems not to work yet :(
  "   if get(g:, 'airline#extensions#tabline#show_tab_type', 1)
  "     dict.add_section_spaced('airline_tablabel' .. (right ? '_right' : ''),
  "       get(g:, 'airline#extensions#tabline#' .. type .. '_label', type))
  "   endif
  " enddef
  "
  " def airline#extensions#tabline#add_tab_label(dict: dict<any>): void
  "   var show_tab_count = get(g:, 'airline#extensions#tabline#show_tab_count', 1)
  "   if show_tab_count == 2
  "     dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
  "   elseif show_tab_count == 1 && tabpagenr('$') > 1
  "     dict.add_section_spaced('airline_tabmod', printf('%s %d/%d', "tab", tabpagenr(), tabpagenr('$')))
  "   endif
  " enddef
endif