airline.txt

*airline.txt*  Lean and mean status/tabline that's light as air
*airline* *vim-airline*
                  _                       _      _ _                        ~
           __   _(_)_ __ ___         __ _(_)_ __| (_)_ __   ___             ~
           \ \ / / | '_ ` _ \ _____ / _` | | '__| | | '_ \ / _ \            ~
            \ V /| | | | | | |_____| (_| | | |  | | | | | |  __/            ~
             \_/ |_|_| |_| |_|      \__,_|_|_|  |_|_|_| |_|\___|            ~
                                                                           ~
Version: 0.11
=============================================================================
CONTENTS                                                  *airline-contents*

   01. Intro ............................................... |airline-intro|
   02. Features ......................................... |airline-features|
   03. Name ................................................. |airline-name|
   04. Configuration ............................... |airline-configuration|
   05. Commands ......................................... |airline-commands|
   06. Autocommands ................................. |airline-autocommands|
   07. Customization ............................... |airline-customization|
   08. Extensions ..................................... |airline-extensions|
   09. Advanced Customization ............. |airline-advanced-customization|
   10. Funcrefs ......................................... |airline-funcrefs|
   11. Pipeline ......................................... |airline-pipeline|
   12. Writing Extensions ..................... |airline-writing-extensions|
   13. Writing Themes ..................................... |airline-themes|
   14. Troubleshooting ........................... |airline-troubleshooting|
   15. Contributions ............................... |airline-contributions|
   16. License ........................................... |airline-license|

=============================================================================
INTRODUCTION                                                 *airline-intro*

vim-airline is a fast and lightweight alternative to powerline, written
in 100% vimscript with no outside dependencies.

When the plugin is correctly loaded, Vim will draw a nice statusline at the
bottom of each window.

That line consists of several sections, each one displaying some piece of
information. By default (without configuration) this line will look like
this: >

+---------------------------------------------------------------------------+
|~                                                                          |
|~                                                                          |
|~                     VIM - Vi IMproved                                    |
|~                                                                          |
|~                       version 8.0                                        |
|~                    by Bram Moolenaar et al.                              |
|~           Vim is open source and freely distributable                    |
|~                                                                          |
|~           type :h :q<Enter>          to exit                             |
|~           type :help<Enter> or <F1>  for on-line help                    |
|~           type :help version8<Enter> for version info                    |
|~                                                                          |
|~                                                                          |
+---------------------------------------------------------------------------+
| A | B |                     C                          X | Y | Z |  [...] |
+---------------------------------------------------------------------------+

The statusline is the colored line at the bottom, which contains the sections
(possibly in different colors):

section  meaning (example)~
--------------------------
  A      displays mode + additional flags like crypt/spell/paste (`INSERT`)
  B      VCS information (branch, hunk summary) (`master`)
  C      filename + read-only flag (`~/.vim/vimrc RO`)
  X      filetype  (`vim`)
  Y      file encoding[fileformat] (`utf-8[unix]`)
         optionally may contain Byte Order Mark `[BOM]` and missing end of last
         line `[!EOL]`
  Z      current position in the file
           percentage % ln: current line/number of lines ☰ cn: column
           So this: 10% ln:10/100☰ cn:20
	   means: >
              10%     - 10 percent
	      ln:     - line number is
              10/100☰ - 10 of 100 total lines
	      cn:     - column number is
              20      - 20
<
  [...]  additional sections (warning/errors/statistics)
         from external plugins (e.g. YCM/syntastic/...)

For a better look, those sections can be colored differently, depending on
the mode and whether the current file is 'modified'

Additionally, several extensions exists, that can provide additional feature
(for example the tabline extension provides an extra statusline on the top of
the Vim window and can display loaded buffers and tabs in the current Vim
session).

Most of this is customizable and the default sections can be configured using
the vim variables g:airline_section_<name> (see |airline-default-sections|)

=============================================================================
FEATURES                                                  *airline-features*

*  tiny core written with extensibility in mind.
*  integrates with many popular plugins.
*  looks good with regular fonts, and provides configuration points so you
   can use unicode or powerline symbols.
*  optimized for speed; it loads in under a millisecond.
*  fully customizable; if you know a little 'statusline' syntax you can
   tweak it to your needs.
*  extremely easy to write themes.

=============================================================================
NAME                                                          *airline-name*

Where did the name come from?

I wrote this on an airplane, and since it's light as air it turned out to be
a good name :-)

=============================================================================
CONFIGURATION                                        *airline-configuration*

There are a couple configuration values available (shown with their default
values):

* enable experimental features >
  " Currently: Enable Vim9 Script implementation
  let g:airline_experimental = 1

* the separator used on the left side >
  let g:airline_left_sep='>'
<
* the separator used on the right side >
  let g:airline_right_sep='<'
<
* enable modified detection >
  let g:airline_detect_modified=1

* enable paste detection >
  let g:airline_detect_paste=1
<
* enable crypt detection >
  let g:airline_detect_crypt=1

* enable spell detection >
  let g:airline_detect_spell=1

* display spelling language when spell detection is enabled
  (if enough space is available) >
  let g:airline_detect_spelllang=1
<
  Set to 'flag' to get a unicode icon of the relavant country flag instead of
  the 'spelllang' itself

* enable iminsert detection >
  let g:airline_detect_iminsert=0
<
* determine whether inactive windows should have the left section collapsed
  to only the filename of that buffer.  >
  let g:airline_inactive_collapse=1
<
* Use alternative separators for the statusline of inactive windows >
  let g:airline_inactive_alt_sep=1
<
* themes are automatically selected based on the matching colorscheme. this
  can be overridden by defining a value. >
  let g:airline_theme='dark'
<
  Note: Only the dark theme is distributed with vim-airline. For more themes,
  checkout the vim-airline-themes repository
  (github.com/vim-airline/vim-airline-themes)

* if you want to patch the airline theme before it gets applied, you can
  supply the name of a function where you can modify the palette. >
  let g:airline_theme_patch_func = 'AirlineThemePatch'
  function! AirlineThemePatch(palette)
    if g:airline_theme == 'badwolf'
      for colors in values(a:palette.inactive)
        let colors[3] = 245
      endfor
    endif
  endfunction
<
* if you want to update your highlights without affecting the airline theme,
  you can do so using the AirlineAfterTheme autocmd. >
  function! s:update_highlights()
    hi CursorLine ctermbg=none guibg=NONE
    hi VertSplit ctermbg=none guibg=NONE
  endfunction
  autocmd User AirlineAfterTheme call s:update_highlights()
<
* By default, airline will use unicode symbols if your encoding matches
  utf-8. If you want the powerline symbols set this variable: >
  let g:airline_powerline_fonts = 1
<
  If you want to use plain ascii symbols, set this variable: >
  let g:airline_symbols_ascii = 1
<
* define the set of text to display for each mode.  >
  let g:airline_mode_map = {} " see source for the defaults

  " or copy paste the following into your vimrc for shortform text
  let g:airline_mode_map = {
      \ '__'     : '-',
      \ 'c'      : 'C',
      \ 'i'      : 'I',
      \ 'ic'     : 'I',
      \ 'ix'     : 'I',
      \ 'n'      : 'N',
      \ 'multi'  : 'M',
      \ 'ni'     : 'N',
      \ 'no'     : 'N',
      \ 'R'      : 'R',
      \ 'Rv'     : 'R',
      \ 's'      : 'S',
      \ 'S'      : 'S',
      \ ''     : 'S',
      \ 't'      : 'T',
      \ 'v'      : 'V',
      \ 'V'      : 'V',
      \ ''     : 'V',
      \ }
   Note: 'multi' is for displaying the multiple cursor mode
<
* define the set of filename match queries which excludes a window from
  having its statusline modified >
  let g:airline_exclude_filenames = [] " see source for current list
<
* define the set of filetypes which are excluded from having its window
  statusline modified >
  let g:airline_exclude_filetypes = [] " see source for current list
<
* define the set of names to be displayed instead of a specific filetypes
  (for section a and b): >

  let g:airline_filetype_overrides = {
      \ 'coc-explorer':  [ 'CoC Explorer', '' ],
      \ 'defx':  ['defx', '%{b:defx.paths[0]}'],
      \ 'fugitive': ['fugitive', '%{airline#util#wrap(airline#extensions#branch#get_head(),80)}'],
      \ 'floggraph':  [ 'Flog', '%{get(b:, "flog_status_summary", "")}' ],
      \ 'gundo': [ 'Gundo', '' ],
      \ 'help':  [ 'Help', '%f' ],
      \ 'minibufexpl': [ 'MiniBufExplorer', '' ],
      \ 'nerdtree': [ get(g:, 'NERDTreeStatusline', 'NERD'), '' ],
      \ 'startify': [ 'startify', '' ],
      \ 'vim-plug': [ 'Plugins', '' ],
      \ 'vimfiler': [ 'vimfiler', '%{vimfiler#get_status_string()}' ],
      \ 'vimshell': ['vimshell','%{vimshell#get_status_string()}'],
      \ 'vaffle' : [ 'Vaffle', '%{b:vaffle.dir}' ],
      \ }
<
* defines whether the preview window should be excluded from having its window
  statusline modified (may help with plugins which use the preview window
  heavily) >
  let g:airline_exclude_preview = 0
<
* disable the Airline statusline customization for selected windows (this is a
  window-local variable so you can disable it per-window) >
  let w:airline_disable_statusline = 1
<
  Old deprecated name: `w:airline_disabled`

  See also the following options, for disabling setting the statusline
  globally or per-buffer
* Disable setting the statusline option: >
  " disable globally
  let g:airline_disable_statusline = 1

  " disable per-buffer
  let b:airline_disable_statusline = 1

< This setting disables setting the 'statusline' option. This allows to use
 e.g. the tabline extension (|airline-tabline|) but keep the 'statusline'
 option totally configurable by a custom configuration.
* Do not draw separators for empty sections (only for the active window) >
  let g:airline_skip_empty_sections = 1
<
  This variable can be overridden by setting a window-local variable with
  the same name (in the correct window): >
  let w:airline_skip_empty_sections = 0
<
* Caches the changes to the highlighting groups, should therefore be faster.
  Set this to one, if you experience a sluggish Vim: >
  let g:airline_highlighting_cache = 0
<
* disable airline on FocusLost autocommand (e.g. when Vim loses focus): >
  let g:airline_focuslost_inactive = 0
<
* configure the fileformat output
  By default, it will display something like 'utf-8[unix]', however, you can
  skip displaying it, if the output matches a configured string. To do so,
  set: >
  let g:airline#parts#ffenc#skip_expected_string='utf-8[unix]'
<
* Display the statusline in the tabline (first top line): >
  let g:airline_statusline_ontop = 1
<
  Setting this option, allows to use the statusline option to be used by
  a custom function or another plugin, since airline won't change it.

  Note: This setting is experimental and works on a best effort approach.
  Updating the statusline might not always happen as fast as needed, but that
  is a limitation, that comes from Vim. airline tries to force an update if
  needed, but it might not always work as expected.
  To force updating the tabline on mode changes, call `airline#check_mode()`
  in your custom statusline setting: `:set stl=%!airline#check_mode(winnr())`
  will correctly update the tabline on mode changes.

* Display a short path in statusline: >
  let g:airline_stl_path_style = 'short'
>
* Display a only file name in statusline: >
  let g:airline_section_c_only_filename = 1
>
=============================================================================
COMMANDS                                                  *airline-commands*

:AirlineTheme {theme-name}                                   *:AirlineTheme*
  Displays or changes the current theme.
  Note: `random` will switch to a random theme.

:AirlineToggleWhitespace                          *:AirlineToggleWhitespace*
  Toggles whitespace detection.

:AirlineToggle                                              *:AirlineToggle*
  Toggles between the standard 'statusline' and airline.

:AirlineRefresh[!]                                         *:AirlineRefresh*
  Refreshes all highlight groups and redraws the statusline. With the '!'
  attribute, skips refreshing the highlighting groups.

:AirlineExtensions                                      *:AirlineExtensions*
  Shows the status of all available airline extensions.
  Extern means, the extensions does not come bundled with Airline.

=============================================================================
AUTOCOMMANDS                                          *airline-autocommands*

Airline comes with some user-defined autocommands.

|AirlineAfterInit|    after plugin is initialized, but before the statusline
                    is replaced
|AirlineAfterTheme|   after theme of the statusline has been changed
|AirlineToggledOn|    after airline is activated and replaced the statusline
|AirlineToggledOff|   after airline is deactivated and the statusline is
                    restored to the original
|AirlineModeChanged|  The mode in Vim changed.

=============================================================================
CUSTOMIZATION                                        *airline-customization*

The following are some unicode symbols for customizing the left/right
separators, as well as the powerline font glyphs.

Note: Some additional characters like spaces and colons may be included in the
default. Including them within the symbol definitions rather than outside of
them allows you to eliminate or otherwise alter them.

Note: Be aware that some of these glyphs are defined as ligatures, so they may
show up different (usually bigger) if followed by a space. This only happens
if both the font and terminal implementation used support ligatures. If you
want to follow a glyph with a space _without_ the alternate ligature being
rendered, follow it with a non-breaking-space character.

Note: You must define the dictionary first before setting values. Also, it's
a good idea to check whether it exists as to avoid accidentally overwriting
its contents. >
  if !exists('g:airline_symbols')
    let g:airline_symbols = {}
  endif

  " unicode symbols
  let g:airline_left_sep = '»'
  let g:airline_left_sep = '▶'
  let g:airline_right_sep = '«'
  let g:airline_right_sep = '◀'
  let g:airline_symbols.colnr = ' ㏇:'
  let g:airline_symbols.colnr = ' ℅:'
  let g:airline_symbols.crypt = '🔒'
  let g:airline_symbols.linenr = '☰'
  let g:airline_symbols.linenr = ' ␊:'
  let g:airline_symbols.linenr = ' ␤:'
  let g:airline_symbols.linenr = '¶'
  let g:airline_symbols.maxlinenr = ''
  let g:airline_symbols.maxlinenr = '㏑'
  let g:airline_symbols.branch = '⎇'
  let g:airline_symbols.paste = 'ρ'
  let g:airline_symbols.paste = 'Þ'
  let g:airline_symbols.paste = '∥'
  let g:airline_symbols.spell = 'Ꞩ'
  let g:airline_symbols.notexists = 'Ɇ'
  let g:airline_symbols.whitespace = 'Ξ'

  " powerline symbols
  let g:airline_left_sep = ''
  let g:airline_left_alt_sep = ''
  let g:airline_right_sep = ''
  let g:airline_right_alt_sep = ''
  let g:airline_symbols.branch = ''
  let g:airline_symbols.colnr = ' ℅:'
  let g:airline_symbols.readonly = ''
  let g:airline_symbols.linenr = ' :'
  let g:airline_symbols.maxlinenr = '☰ '
  let g:airline_symbols.dirty='⚡'

  " old vim-powerline symbols
  let g:airline_left_sep = '⮀'
  let g:airline_left_alt_sep = '⮁'
  let g:airline_right_sep = '⮂'
  let g:airline_right_alt_sep = '⮃'
  let g:airline_symbols.branch = '⭠'
  let g:airline_symbols.readonly = '⭤'
  let g:airline_symbols.linenr = '⭡'
<

For more intricate customizations, you can replace the predefined sections
with the usual statusline syntax.

Note: If you define any section variables it will replace the default values
entirely.  If you want to disable only certain parts of a section you can
try using variables defined in the |airline-configuration| or
|airline-extensions| section.
                                                   |airline-default-sections|
The following table describes what sections are available by default, and
which extensions/functions make use of it. Note: using `g:` (global) variable
prefix means, those variables are defined for all windows. You can use `w:`
(window local variables) instead to make this apply only to a particular
window.
>
  variable names                default contents
  ---------------------------------------------------------------------------
  let g:airline_section_a       (mode, crypt, paste, spell, iminsert)
  let g:airline_section_b       (hunks, branch)[*]
  let g:airline_section_c       (bufferline or filename, readonly)
  let g:airline_section_gutter  (csv)
  let g:airline_section_x       (tagbar, filetype, virtualenv)
  let g:airline_section_y       (fileencoding, fileformat, 'bom', 'eol')
  let g:airline_section_z       (percentage, line number, column number)
  let g:airline_section_error   (ycm_error_count, syntastic-err, eclim,
                                 languageclient_error_count)
  let g:airline_section_warning (ycm_warning_count, syntastic-warn,
                                 languageclient_warning_count, whitespace)

  " [*] This section needs at least the fugitive extension or else
  "     it will remain empty
  "
  " here is an example of how you could replace the branch indicator with
  " the current working directory (limited to 10 characters),
  " followed by the filename.
  let g:airline_section_b = '%-0.10{getcwd()}'
  let g:airline_section_c = '%t'
<
                                                *airline#ignore_bufadd_pat*
Determines a pattern to ignore a buffer name for various things (e.g. the
tabline extension) or the read-only check. Default is
`g:airline#extensions#tabline#ignore_bufadd_pat` (see below) or
`'!|defx|gundo|nerd_tree|startify|tagbar|term://|undotree|vimfiler'`
if it is unset.
The "!" prevents terminal buffers to appear in the tabline.

                                *airline#extensions#tabline#exclude_buffers*
Buffer numbers to be excluded from showing in the tabline (similar to
|airline#ignore_bufadd_pat|).

=============================================================================
EXTENSIONS                                              *airline-extensions*

Most extensions are enabled by default and lazily loaded when the
corresponding plugin (if any) is detected.

By default, airline will attempt to load any extension it can find in the
'runtimepath'.  On some systems this can result in an undesirable startup
cost.  You can disable the check with the following flag. >
  let g:airline#extensions#disable_rtp_load = 1
<
  Note: Third party plugins that rely on this behavior will be affected. You
  will need to manually load them.

Alternatively, if you want a minimalistic setup and would rather opt-in which
extensions get loaded instead of disabling each individually, you can declare
the following list variable: >
  " an empty list disables all extensions
  let g:airline_extensions = []

  " or only load what you want
  let g:airline_extensions = ['branch', 'tabline']
<
In addition, each extension can be configured individually.  Following are
the options for each extension (in alphabetical order, after the default
extension)

Usually, each extension will only be loaded if the required Vim plugin is
installed as well, otherwise it will remain disabled. See the output of the
|:AirlineExtensions| command.

-------------------------------------                    *airline-ale*
ale <https://github.com/dense-analysis/ale>

* enable/disable ale integration >
  let g:airline#extensions#ale#enabled = 1

* ale error_symbol >
  let airline#extensions#ale#error_symbol = 'E:'
<
* ale warning >
  let airline#extensions#ale#warning_symbol = 'W:'

* ale show_line_numbers >
  let airline#extensions#ale#show_line_numbers = 1
<
* ale open_lnum_symbol >
  let airline#extensions#ale#open_lnum_symbol = '(L'
<
* ale close_lnum_symbol >
  let airline#extensions#ale#close_lnum_symbol = ')'

-------------------------------------                      *airline-battery*
vim-battery <https://github.com/lambdalisue/battery.vim>

* enable/disable battery integration >
  let g:airline#extensions#battery#enabled = 1
<  default: 0

-------------------------------------                      *airline-bookmark*
vim-bookmark <https://github.com/MattesGroeger/vim-bookmarks>

* enable/disable bookmark integration >
  let g:airline#extensions#bookmark#enabled = 1

-------------------------------------                      *airline-branch*
vim-airline will display the branch-indicator together with the branch name
in the statusline, if one of the following plugins is installed:

fugitive.vim <https://github.com/tpope/vim-fugitive>
gina.vim     <https://github.com/lambdalisue/gina.vim>
lawrencium   <https://bitbucket.org/ludovicchabant/vim-lawrencium>
vcscommand   <http://www.vim.org/scripts/script.php?script_id=90>

If a file is edited, that is not yet in the repository, the
notexists symbol will be displayed after the branch name. If the repository
is not clean, the dirty symbol will be displayed after the branch name.

* notexists symbol means you are editing a file, that has not been
  committed yet
  default: '?'

* the dirty symbol basically means your working directory is dirty
  default: '!'

Note: the branch extension will be disabled for windows smaller than 80
characters.

* enable/disable fugitive/lawrencium integration >
  let g:airline#extensions#branch#enabled = 1
<
* change the text for when no branch is detected >
  let g:airline#extensions#branch#empty_message = ''
<
* define the order in which the branches of different vcs systems will be
  displayed on the statusline (currently only for fugitive and lawrencium) >
  let g:airline#extensions#branch#vcs_priority = ["git", "mercurial"]
<
* use vcscommand.vim if available >
  let g:airline#extensions#branch#use_vcscommand = 0
<
* truncate long branch names to a fixed length >
  let g:airline#extensions#branch#displayed_head_limit = 10
<
* customize formatting of branch name >
  " default value leaves the name unmodifed
  let g:airline#extensions#branch#format = 0

  " to only show the tail, e.g. a branch 'feature/foo' becomes 'foo', use
  let g:airline#extensions#branch#format = 1

  " to truncate all path sections but the last one, e.g. a branch
  " 'foo/bar/baz' becomes 'f/b/baz', use
  let g:airline#extensions#branch#format = 2

  " if a string is provided, it should be the name of a function that
  " takes a string and returns the desired value
  let g:airline#extensions#branch#format = 'CustomBranchName'
  function! CustomBranchName(name)
    return '[' . a:name . ']'
  endfunction
<
* truncate sha1 commits at this number of characters  >
  let g:airline#extensions#branch#sha1_len = 10

* customize branch name retrieval for any version control system >
  let g:airline#extensions#branch#custom_head = 'GetScmBranch'
  function! GetScmBranch()
    if !exists('b:perforce_client')
      let b:perforce_client = system('p4 client -o | grep Client')
      " Invalidate cache to prevent stale data when switching clients. Use a
      " buffer-unique group name to prevent clearing autocmds for other
      " buffers.
      exec 'augroup perforce_client-'. bufnr("%")
          au!
          autocmd BufWinLeave <buffer> silent! unlet! b:perforce_client
      augroup END
    endif
    return b:perforce_client
  endfunction
>
* configure additional vcs checks to run
  By default, vim-airline will check if the current edited file is untracked
  in the repository. If so, it will append the `g:airline_symbols.notexists`
  symbol to the branch name.
  In addition, it will check if the repository is clean, else it will append
  the `g:airline_symbols.dirty` symbol to the branch name (if the current
  file is not untracked). Configure, by setting the following variable: >

  let g:airline#extensions#branch#vcs_checks = ['untracked', 'dirty']
<
-------------------------------------                      *airline-flog*
vim-flog <https://github.com/rbong/vim-flog>

If vim-flog is installed, vim-airline will display the branch name
together with a status summary in the git log graph buffer;
either 'no changes' or the number of added/removed/modified files.

-------------------------------------                   *airline-bufferline*
vim-bufferline <https://github.com/bling/vim-bufferline>

* enable/disable bufferline integration >
  let g:airline#extensions#bufferline#enabled = 1
<
* determine whether bufferline will overwrite customization variables >
  let g:airline#extensions#bufferline#overwrite_variables = 1
<
-------------------------------------                     *airline-capslock*
vim-capslock <https://github.com/tpope/vim-capslock>

* enable/disable vim-capslock integration >
  let g:airline#extensions#capslock#enabled = 1

* change vim-capslock symbol >
  let g:airline#extensions#capslock#symbol = 'CAPS' (default)

-------------------------------------                    *airline-coc*
coc <https://github.com/neoclide/coc.nvim>

* enable/disable coc integration >
  let g:airline#extensions#coc#enabled = 1
<
* change error symbol: >
  let airline#extensions#coc#error_symbol = 'E:'
<
* change warning symbol: >
  let airline#extensions#coc#warning_symbol = 'W:'
<
* enable/disable coc status display >
  g:airline#extensions#coc#show_coc_status = 1
<
-------------------------------------                    *airline-commandt*
command-t <https://github.com/wincent/command-t>

No configuration available.

-------------------------------------                          *airline-csv*
csv.vim <https://github.com/chrisbra/csv.vim>

* enable/disable csv integration for displaying the current column. >
  let g:airline#extensions#csv#enabled = 1
<
* change how columns are displayed. >
  let g:airline#extensions#csv#column_display = 'Number' (default)
  let g:airline#extensions#csv#column_display = 'Name'
<
-------------------------------------                        *airline-ctrlp*
ctrlp <https://github.com/ctrlpvim/ctrlp.vim>

* configure which mode colors should ctrlp window use (takes effect
  only if the active airline theme doesn't define ctrlp colors) >
  let g:airline#extensions#ctrlp#color_template = 'insert' (default)
  let g:airline#extensions#ctrlp#color_template = 'normal'
  let g:airline#extensions#ctrlp#color_template = 'visual'
  let g:airline#extensions#ctrlp#color_template = 'replace'
<
* configure whether to show the previous and next modes (mru, buffer, etc...)
>
 let g:airline#extensions#ctrlp#show_adjacent_modes = 1
<
-------------------------------------                    *airline-ctrlspace*
vim-ctrlspace <https://github.com/szw/vim-ctrlspace>

* enable/disable vim-ctrlspace integration >
  let g:airline#extensions#ctrlspace#enabled = 1
<
  To make the vim-ctrlspace integration work you will need to make the
  ctrlspace statusline function call the correct airline function. Therefore
  add the following line into your .vimrc: >

  let g:CtrlSpaceStatuslineFunction =
   \  "airline#extensions#ctrlspace#statusline()"
<
-------------------------------------                    *airline-cursormode*
cursormode <https://github.com/vheon/vim-cursormode>

Built-in extension to displays cursor in different colors depending on the
current mode (only works in terminals iTerm, AppleTerm and xterm)

* enable cursormode integration >
  let g:airline#extensions#cursormode#enabled = 1

* mode function. Return value is used as key for the color mapping. Default
  is |mode()|
  `let g:cursormode_mode_func = 'mode'`
  color mapping. Keys come from `g:cursormode_mode_func`
  (a background value can be appended)
  `let g:cursormode_color_map = {`
`\ "nlight": '#000000',`
`\ "ndark": '#BBBBBB',`
`\ "i": g:airline#themes#{g:airline_theme}#palette.insert.airline_a[1],`
`\ "R": g:airline#themes#{g:airline_theme}#palette.replace.airline_a[1],`
`\ "v": g:airline#themes#{g:airline_theme}#palette.visual.airline_a[1],`
`\ "V": g:airline#themes#{g:airline_theme}#palette.visual.airline_a[1],`
`\ "\<C-V>": g:airline#themes#{g:airline_theme}#palette.visual.airline_a[1],`
`\ }`

-------------------------------------                      *airline-default*
The default extensions is an internal extension that is needed for handling
all other extensions, takes care of how all sections will be combined into a
'statusline' specific item and when to truncate each section.

It understands all of the `g:` variables in the |airline-configuration|
section, however it also has some more fine-tuned configuration values that
you can use.

* control which sections get truncated and at what width. >
  let g:airline#extensions#default#section_truncate_width = {
      \ 'b': 79,
      \ 'x': 60,
      \ 'y': 80,
      \ 'z': 45,
      \ 'warning': 80,
      \ 'error': 80,
      \ }

  " Note: set to an empty dictionary to disable truncation.
  let g:airline#extensions#default#section_truncate_width = {}
<
* configure the layout of the sections by specifying an array of two arrays
  (first array is the left side, second array is the right side). >
  let g:airline#extensions#default#layout = [
      \ [ 'a', 'b', 'c' ],
      \ [ 'x', 'y', 'z', 'error', 'warning' ]
      \ ]
<
* configure the layout to not use %(%) grouping items in the statusline.
  Try setting this to zero, if you notice bleeding color artifacts >
  let airline#extensions#default#section_use_groupitems = 1
<
-------------------------------------                      *airline-denite*
Denite <https://github.com/Shougo/denite.nvim>

* enable/disable denite integration >
  let g:airline#extensions#denite#enabled = 1

-------------------------------------                      *airline-dirvish*
vim-dirvish <https://github.com/justinmk/vim-dirvish>

* enable/disable vim-dirvish integration >
  let g:airline#extensions#dirvish#enabled = 1
<  default: 1

-------------------------------------                        *airline-eclim*
eclim <https://eclim.org>

* enable/disable eclim integration, which works well with the
  |airline-syntastic| extension. >
  let g:airline#extensions#eclim#enabled = 1

-------------------------------------                 	      *airline-fern*
fern.vim <https://github.com/lambdalisue/fern.vim>

Airline displays the fern.vim specific statusline.
(for details, see the help of fern.vim)

* enable/disable bufferline integration >
  let g:airline#extensions#fern#enabled = 1
<  default: 1

-------------------------------------                  *airline-fugitiveline*
This extension hides the fugitive://**// part of the buffer names, to only
show the file name as if it were in the current working tree.
It is deactivated by default if |airline-bufferline| is activated.

* enable/disable bufferline integration >
  let g:airline#extensions#fugitiveline#enabled = 1
<
If enabled, the buffer that comes from fugitive, will have added a trailing
"[git]" to be able to distinguish between fugitive and non-fugitive buffers.

-------------------------------------                        *airline-fzf*
fzf <https://github.com/junegunn/fzf>
fzf.vim <https://github.com/junegunn/fzf.vim>

* enable/disable fzf integration >
  let g:airline#extensions#fzf#enabled = 1

-------------------------------------                     *airline-gina*
gina.vim <https://github.com/lambdalisue/gina.vim>

Airline displays the gina.vim specific statusline.
(for details, see the help of gina.vim)

* enable/disable bufferline integration >
  let g:airline#extensions#gina#enabled = 1
<  default: 1

-------------------------------------                     *airline-grepper*
vim-grepper <https://github.com/mhinz/vim-grepper>

* enable/disable vim-grepper integration >
  let g:airline#extensions#grepper#enabled = 1

-------------------------------------                     *airline-gutentags*
vim-gutentags <https://github.com/ludovicchabant/vim-gutentags>

* enable/disable vim-gutentags integration >
  let g:airline#extensions#gutentags#enabled = 1

-------------------------------------                     *gen_tags.vim*
gen_tags.vim <https://github.com/jsfaint/gen_tags.vim>

* enable/disable gen_tags.vim integration >
  let g:airline#extensions#gen_tags#enabled = 1

-------------------------------------                        *airline-hunks*
vim-gitgutter <https://github.com/airblade/vim-gitgutter>
vim-signify <https://github.com/mhinz/vim-signify>
changesPlugin <https://github.com/chrisbra/changesPlugin>
quickfixsigns <https://github.com/tomtom/quickfixsigns_vim>
coc-git <https://github.com/neoclide/coc-git>

You can use `airline#extensions#hunks#get_raw_hunks()` to get the full hunks,
without shortening. This allows for advanced customization, or a quick way of
querying how many changes you got. It will return something like '+4 ~2 -1'.

* enable/disable showing a summary of changed hunks under source control. >
  let g:airline#extensions#hunks#enabled = 1
<
* enable/disable showing only non-zero hunks. >
  let g:airline#extensions#hunks#non_zero_only = 0
<
* set hunk count symbols. >
  let g:airline#extensions#hunks#hunk_symbols = ['+', '~', '-']

* enable coc-git extension.
  If not set to 1, vim-airline will not consider to use coc-git for the hunks
  extension. Make sure to have the coc-git extension enabled. >
  let g:airline#extensions#hunks#coc_git = 1
<
-------------------------------------                     *airline-keymap*
vim-keymap

This extension displays the current 'keymap' in use.

* enable/disable vim-keymap extension >
  let g:airline#extensions#keymap#enabled = 1

* set label for a keymap (default is from g:airline_symbols.keymap) >
  let g:airline#extensions#keymap#label = 'Layout:'

* set name for default layout (empty to disable it completely) >
  let g:airline#extensions#keymap#default = ''

* set short codes for layout names >
  let g:airline#extensions#keymap#short_codes = {'russian-jcukenwin': 'ru'}

-------------------------------------                *airline-languageclient*
LanguageClient <https://github.com/autozimu/LanguageClient-neovim>
(despite its name, it can be used for Vim and Neovim).

* enable/disable LanguageClient integration >
  let g:airline#extensions#languageclient#enabled = 1

* languageclient error_symbol >
  let airline#extensions#languageclient#error_symbol = 'E:'
<
* languageclient warning_symbol >
  let airline#extensions#languageclient#warning_symbol = 'W:'

* languageclient show_line_numbers >
  let airline#extensions#languageclient#show_line_numbers = 1
<
* languageclient open_lnum_symbol >
  let airline#extensions#languageclient#open_lnum_symbol = '(L'
<
* languageclient close_lnum_symbol >
  let airline#extensions#languageclient#close_lnum_symbol = ')'

-------------------------------------                   *airline-localsearch*
localsearch <https://github.com/mox-mox/vim-localsearch>

* enable/disable localsearch indicator integration >
  let g:airline#extensions#localsearch#enabled = 1

* invert the localsearch indicator
  if set to 1, the indicator shall only be shown when localsearch is disabled
  the text will also change from 'LS' to 'GS' (Global Search) >
  let g:airline#extensions#localsearch#inverted = 0

-------------------------------------                    *airline-lsp*
lsp <https://github.com/prabirshrestha/vim-lsp>

* enable/disable lsp integration >
  let g:airline#extensions#lsp#enabled = 1

* lsp error_symbol >
  let airline#extensions#lsp#error_symbol = 'E:'
<
* lsp warning >
  let airline#extensions#lsp#warning_symbol = 'W:'

* lsp show_line_numbers >
  let airline#extensions#lsp#show_line_numbers = 1
<
* lsp open_lnum_symbol >
  let airline#extensions#lsp#open_lnum_symbol = '(L'
<
* lsp close_lnum_symbol >
  let airline#extensions#lsp#close_lnum_symbol = ')'
<
* lsp progress skip time
  Suppresses the frequency of status line updates.
  Prevents heavy operation when using a language server that sends frequent progress notifications.
  Set 0 to disable. >
  g:airline#extensions#lsp#progress_skip_time = 0.3 (default)
<

-------------------------------------                    *airline-neomake*
neomake <https://github.com/neomake/neomake>

* enable/disable neomake integration >
  let g:airline#extensions#neomake#enabled = 1

* neomake error_symbol >
  let airline#extensions#neomake#error_symbol = 'E:'
<
* neomake warning >
  let airline#extensions#neomake#warning_symbol = 'W:'
<
-------------------------------------                   *airline-nerdtree*
NerdTree <https://github.com/preservim/nerdtree.git>

Airline displays the Nerdtree specific statusline (which can be configured
using the |'NerdTreeStatusline'| variable (for details, see the help of
NerdTree)

* enable/disable nerdtree's statusline integration >
  let g:airline#extensions#nerdtree_statusline = 1
<  default: 1

-------------------------------------                      *airline-nrrwrgn*
NrrwRgn <https://github.com/chrisbra/NrrwRgn>

* enable/disable NrrwRgn integration >
  let g:airline#extensions#nrrwrgn#enabled = 1

-------------------------------------                    *airline-nvimlsp*
nvimlsp <https://github.com/neovim/nvim-lsp>

* enable/disable nvimlsp integration >
  let g:airline#extensions#nvimlsp#enabled = 1

* nvimlsp error_symbol >
  let airline#extensions#nvimlsp#error_symbol = 'E:'
<
* nvimlsp warning - needs v:lua.vim.diagnostic.get
  let airline#extensions#nvimlsp#warning_symbol = 'W:'

* nvimlsp show_line_numbers - needs v:lua.vim.diagnostic.get
  let airline#extensions#nvimlsp#show_line_numbers = 1

* nvimlsp open_lnum_symbol - needs v:lua.vim.diagnostic.get
  let airline#extensions#nvimlsp#open_lnum_symbol = '(L'

* nvimlsp close_lnum_symbol - needs v:lua.vim.diagnostic.get
  let airline#extensions#nvimlsp#close_lnum_symbol = ')'

-------------------------------------                    *airline-obsession*
vim-obsession <https://github.com/tpope/vim-obsession>

* enable/disable vim-obsession integration >
  let g:airline#extensions#obsession#enabled = 1

* set marked window indicator string >
  let g:airline#extensions#obsession#indicator_text = '$'
<
-------------------------------------                    *airline-omnisharp*
OmniSharp <https://github.com/OmniSharp/omnisharp-vim>

* enable/disable OmniSharp integration >
  let g:airline#extensions#omnisharp#enabled = 1

-------------------------------------                          *airline-po*
This extension will display the currently translated, untranslated and fuzzy
messages when editing translations (po files). Related plugin (not necessary
for this extension is po.vim from
<http://www.vim.org/scripts/script.php?script_id=2530>

It will be enabled if the `msgfmt` executable is available and one is editing
files with the 'filetype' "po".

* enable/disable po integration >
  let g:airline#extensions#po#enabled = 1
<
* truncate width names to a fixed length >
  let g:airline#extensions#po#displayed_limit = 0

-------------------------------------                   *airline-poetv*
poetv <https://github.com/petobens/poet-v>

* enable/disable poetv integration >
  let g:airline#extensions#poetv#enabled = 1
<
-------------------------------------                   *airline-promptline*
promptline <https://github.com/edkolev/promptline.vim>

* configure the path to the snapshot .sh file. Mandatory option. The created
  file should be sourced by the shell on login >
  " in .vimrc
  airline#extensions#promptline#snapshot_file = "~/.shell_prompt.sh"

  " in .bashrc/.zshrc
  [ -f ~/.shell_prompt.sh ] && source ~/.shell_prompt.sh
<
* enable/disable promptline integration >
  let g:airline#extensions#promptline#enabled = 0
<
* configure which mode colors should be used in prompt >
  let airline#extensions#promptline#color_template = 'normal' (default)
  let airline#extensions#promptline#color_template = 'insert'
  let airline#extensions#promptline#color_template = 'visual'
  let airline#extensions#promptline#color_template = 'replace'
<
-------------------------------------                     *airline-quickfix*
The quickfix extension is a simple built-in extension which determines
whether the buffer is a quickfix or location list buffer, and adjusts the
title accordingly.

* configure the title text for quickfix buffers >
  let g:airline#extensions#quickfix#quickfix_text = 'Quickfix'
<
* configure the title text for location list buffers >
  let g:airline#extensions#quickfix#location_text = 'Location'
<
-------------------------------------                     *airline-rufo*
rufo <https://github.com/ruby-formatter/rufo-vim>

The rufo (Ruby Formatter) extension merely displays whether vim-rufo is
currently enabled, in the z sction of the statusline.

* enable/disable vim-rufo integration >
  let g:airline#extensions#rufo#enabled = 1
<
* configure the symbol, or text, to display when vim-rufo auto formatting
  is on >
  let g:airline#extensions#rufo#symbol = 'R'
<
-------------------------------------                     *airline-searchcount*
The searchcount extension supports the searchcount() function in Vim script.
Note: This is only enabled when 'hls' is on. When you turn off search
highlighting (e.g. using |:nohls|), it this will be disabled.

* enable/disable searchcount integration >
  let g:airline#extensions#searchcount#enabled = 1
<
-------------------------------------                    *airline-syntastic*
syntastic <https://github.com/vim-syntastic/syntastic>

* enable/disable syntastic integration >
  let g:airline#extensions#syntastic#enabled = 1

  Note: The recommendation from syntastic to modify the statusline directly
  does not apply, if you use vim-airline, since it will take care for you of
  adjusting the statusline.

* syntastic error_symbol >
  let airline#extensions#syntastic#error_symbol = 'E:'
<
* syntastic statusline error format (see |syntastic_stl_format|) >
  let airline#extensions#syntastic#stl_format_err = '%E{[%fe(#%e)]}'

* syntastic warning >
  let airline#extensions#syntastic#warning_symbol = 'W:'
<
* syntastic statusline warning format (see |syntastic_stl_format|) >
  let airline#extensions#syntastic#stl_format_warn = '%W{[%fw(#%w)]}'
<
-------------------------------------                      *airline-tabline*
Note: If you're using the ctrlspace tabline only the option marked with (c)
are supported!

* enable/disable enhanced tabline. (c) >
  let g:airline#extensions#tabline#enabled = 0

* enable/disable displaying open splits per tab (only when tabs are opened) >
  let g:airline#extensions#tabline#show_splits = 1

* switch position of buffers and tabs on splited tabline (c)
  (only supported for ctrlspace plugin). >
  let g:airline#extensions#tabline#switch_buffers_and_tabs = 0
<
* enable/disable displaying buffers with a single tab. (c) >
  let g:airline#extensions#tabline#show_buffers = 1

Note: If you are using neovim (has('tablineat') = 1), then you can click
on the tabline with the left mouse button to switch to that buffer, and
with the middle mouse button to delete that buffer.

* if you want to show the current active buffer like this:
  ----------------------
  buffer <buffer> buffer `
>
 let g:airline#extensions#tabline#alt_sep = 1
< Only makes sense, if g:airline_right_sep is not empty.
 default: 0

* enable/disable displaying tabs, regardless of number. (c) >
  let g:airline#extensions#tabline#show_tabs = 1

* enable/disable displaying number of tabs in the right side (c) >
  let g:airline#extensions#tabline#show_tab_count = 1

Note: Not displayed if the number of tabs is less than 1

* always displaying number of tabs in the right side (c) >
  let g:airline#extensions#tabline#show_tab_count = 2
<
* configure filename match rules to exclude from the tabline. >
  let g:airline#extensions#tabline#excludes = []

* enable/disable display preview window buffer in the tabline. >
  let g:airline#extensions#tabline#exclude_preview = 1

* configure how numbers are displayed in tab mode. >
  let g:airline#extensions#tabline#tab_nr_type = 0 " # of splits (default)
  let g:airline#extensions#tabline#tab_nr_type = 1 " tab number
  let g:airline#extensions#tabline#tab_nr_type = 2 " splits and tab number
  let g:airline#extensions#tabline#tabnr_formatter = 'tabnr'

  Note: last option can be used to specify a different formatter for
  displaying the numbers. By default tabline/formatter/tabnr.vim is used
  The argument of that setting should either be a filename that exists
  autoload/airline/extensions/tabline/formatter/ (without .vim extension)
  and needs to provide a format() function. Alternatively you can use a
  custom function name, that is defined e.g. in your .vimrc file. In any
  case, the function needs to take 2 arguments, tab_nr_type and tabpage
  number.
  For an example, have a look at the default tabline/formatter/tabnr.vim
<
* enable/disable displaying tab number in tabs mode. >
  let g:airline#extensions#tabline#show_tab_nr = 1

* enable/disable displaying tab number in tabs mode for ctrlspace. (c) >
  let g:airline#extensions#tabline#ctrlspace_show_tab_nr = 0

* enable/disable displaying tab type (e.g. [buffers]/[tabs]) >
  let g:airline#extensions#tabline#show_tab_type = 1

* show buffer label at first position: >
  let g:airline#extensions#tabline#buf_label_first = 1

* rename label for buffers (default: 'buffers') (c) >
  let g:airline#extensions#tabline#buffers_label = 'b'

* rename label for tabs (default: 'tabs') (c) >
  let g:airline#extensions#tabline#tabs_label = 't'

* change the symbol for skipped tabs/buffers (default '...') >
  let g:airline#extensions#tabline#overflow_marker = '…'

* always show current tabpage/buffer first >
  let airline#extensions#tabline#current_first = 1
<  default: 0

* enable/disable displaying index of the buffer.

  `buffer_idx_mode` allows 3 different modes to access buffers from the
  tabline. When enabled, numbers will be displayed in the tabline and
  mappings will be exposed to allow you to select a buffer directly.
  In default mode, when the variable is 1 Up to 10 mappings will be
  exposed. Note: As 10 and 1 have same prefix, we use 0 to replace 10. So,
  <leader>0 will jump to tenth buffer. Those mappings are not automatically
  created, vim-airline just exposes those `<Plug>AirlineSeelctTab` keys
  for you to map to a convenient key >

  let g:airline#extensions#tabline#buffer_idx_mode = 1
  nmap <leader>1 <Plug>AirlineSelectTab1
  nmap <leader>2 <Plug>AirlineSelectTab2
  nmap <leader>3 <Plug>AirlineSelectTab3
  nmap <leader>4 <Plug>AirlineSelectTab4
  nmap <leader>5 <Plug>AirlineSelectTab5
  nmap <leader>6 <Plug>AirlineSelectTab6
  nmap <leader>7 <Plug>AirlineSelectTab7
  nmap <leader>8 <Plug>AirlineSelectTab8
  nmap <leader>9 <Plug>AirlineSelectTab9
  nmap <leader>0 <Plug>AirlineSelectTab0
  nmap <leader>- <Plug>AirlineSelectPrevTab
  nmap <leader>+ <Plug>AirlineSelectNextTab
<
  In mode 2, (when the variable is 2) 89 mappings will be exposed: >

  let g:airline#extensions#tabline#buffer_idx_mode = 2
  nmap <Leader>10 <Plug>AirlineSelectTab10
  nmap <Leader>11 <Plug>AirlineSelectTab11
  nmap <Leader>12 <Plug>AirlineSelectTab12
  nmap <Leader>13 <Plug>AirlineSelectTab13
  ...
  nmap <Leader>99 <Plug>AirlineSelectTab99
<
  The <Plug>AirlineSelect<Prev/Next>Tab mapping handles counts as well,
  so one can handle arbirtrarily number of buffers/tabs.

  Mode 3 is exactly the same as mode 2, except the indexing start at 01,
  exposing 99 mappings: >

  let g:airline#extensions#tabline#buffer_idx_mode = 3
  nmap <Leader>01 <Plug>AirlineSelectTab01
  nmap <Leader>02 <Plug>AirlineSelectTab02
  nmap <Leader>03 <Plug>AirlineSelectTab03
  ...
  nmap <Leader>99 <Plug>AirlineSelectTab99
<
  This matches that of the numbering scheme of |:buffers|, letting
  `<Plug>AirlineSelectTab67` to reference buffer 67.

  Note: To avoid ambiguity, there won't be <Plug>AirlineSelectTab1
  - <Plug>AirlineSelectTab9 maps in mode 2 and 3.

  Note: Mappings will be ignored for filetypes that match
  `g:airline#extensions#tabline#keymap_ignored_filetypes`.

  Note: In buffer_idx_mode these mappings won't change the
  current tab, but switch to the buffer `visible` in the current tab.
  If you want to switch to a buffer, that is not visible use the
  `AirlineSelectPrev/NextTab` mapping (it supports using a count).
  Use |gt| for switching tabs.
  In tabmode, those mappings will be exposed as well and will switch
  to the specified tab.

* define the set of filetypes which are ignored for the selectTab
  keymappings: >
  let g:airline#extensions#tabline#keymap_ignored_filetypes =
        \ ['vimfiler', 'nerdtree']

* change the display format of the buffer index >
  let g:airline#extensions#tabline#buffer_idx_format = {
        \ '0': '0 ',
        \ '1': '1 ',
        \ '2': '2 ',
        \ '3': '3 ',
        \ '4': '4 ',
        \ '5': '5 ',
        \ '6': '6 ',
        \ '7': '7 ',
        \ '8': '8 ',
        \ '9': '9 '
        \}
<
* defines the name of a formatter for how buffer names are displayed. (c) >
  let g:airline#extensions#tabline#formatter = 'default'

  " here is how you can define a 'foo' formatter:
  " create a file in the dir autoload/airline/extensions/tabline/formatters/
  " called foo.vim >
  function! airline#extensions#tabline#formatters#foo#format(bufnr, buffers)
    return fnamemodify(bufname(a:bufnr), ':t')
  endfunction
  let g:airline#extensions#tabline#formatter = 'foo'
<
  Note: the following variables are used by the 'default' formatter.
  When no disambiguation is needed, both 'unique_tail_improved' and
  'unique_tail' delegate formatting to 'default', so these variables also
  control rendering of unique filenames when using these formatters.

    * configure whether buffer numbers should be shown. >
      let g:airline#extensions#tabline#buffer_nr_show = 0
<
    * configure how buffer numbers should be formatted with |printf()|. >
      let g:airline#extensions#tabline#buffer_nr_format = '%s: '
<
    * configure the formatting of filenames (see |filename-modifiers|). >
      let g:airline#extensions#tabline#fnamemod = ':p:.'
<
    * configure collapsing parent directories in buffer name. >
      let g:airline#extensions#tabline#fnamecollapse = 1
<
    * configure truncating non-active buffer names to specified length. >
      let g:airline#extensions#tabline#fnametruncate = 0

  " The `unique_tail` algorithm will display the tail of the filename, unless
  " there is another file of the same name, in which it will display it along
  " with the containing parent directory.
  let g:airline#extensions#tabline#formatter = 'unique_tail'

      " The following variables are also used by `unique_tail` formatter.
      " the meanings are the same as the ones in default formatter.

      let g:airline#extensions#tabline#fnamemod = ':p:.'
      let g:airline#extensions#tabline#fnamecollapse = 1

  " The `unique_tail_improved` - another algorithm, that will smartly
  " uniquify buffers names with similar filename, suppressing common
  " parts of paths.
  let g:airline#extensions#tabline#formatter = 'unique_tail_improved'

  " The `short_path` - is a simple formatter, that will show the
  filename, with its extension, and the first parent directory only.

  e.g.
     /home/user/project/subdir/file.ext -> subdir/file.ext

  let g:airline#extensions#tabline#formatter = 'short_path'

* defines the customized format() function to display tab title in tab mode. >
  let g:airline#extensions#tabline#tabtitle_formatter = 'MyTabTitleFormatter'
<
  Then define the MyTabTitleFormatter() function in your vimrc. >
    function MyTabTitleFormatter(n)
      let buflist = tabpagebuflist(a:n)
      let winnr = tabpagewinnr(a:n)
      let bufnr = buflist[winnr - 1]
      let winid = win_getid(winnr, a:n)
      let title = bufname(bufnr)

      if empty(title)
        if getqflist({'qfbufnr' : 0}).qfbufnr == bufnr
          let title = '[Quickfix List]'
        elseif winid && getloclist(winid, {'qfbufnr' : 0}).qfbufnr == bufnr
          let title = '[Location List]'
        else
          let title = '[No Name]'
        endif
      endif

      return title
    endfunction

* configure the minimum number of buffers needed to show the tabline. >
  let g:airline#extensions#tabline#buffer_min_count = 0
<
  Note: this setting only applies to a single tab and when `show_buffers` is
  true.

* configure the minimum number of tabs needed to show the tabline. >
  let g:airline#extensions#tabline#tab_min_count = 0
<
  Note: this setting only applies when `show_buffers` is false.

* configure separators for the tabline only. >
  let g:airline#extensions#tabline#left_sep = ''
  let g:airline#extensions#tabline#left_alt_sep = ''
  let g:airline#extensions#tabline#right_sep = ''
  let g:airline#extensions#tabline#right_alt_sep = ''

* configure whether close button should be shown: >
  let g:airline#extensions#tabline#show_close_button = 1

* configure symbol used to represent close button >
  let g:airline#extensions#tabline#close_symbol = 'X'

* configure pattern to be ignored on BufAdd autocommand >
  " fixes unnecessary redraw, when e.g. opening Gundo window
  let airline#extensions#tabline#ignore_bufadd_pat =
            \ '\c\vgundo|undotree|vimfiler|tagbar|nerd_tree'

Note: Enabling this extension will modify 'showtabline' and 'guioptions'.

* enable Refresh of tabline buffers on |BufAdd| autocommands
  (set this to one, if you note 'AirlineTablineRefresh', however, this
   won't update airline on |:badd| commands) >
  let airline#extensions#tabline#disable_refresh = 0

* preserve windows when closing a buffer from the bufferline
  (neovim specific, only works with buffers and not real tabs, default: 0) >
  let airline#extensions#tabline#middle_click_preserves_windows = 1
<
						*airline-tabline-hlgroups*
When the tabline is enabled, vim-airline exposes the following highlighting
groups:

  airline_tab:		default highlighting group for the tabline
  airline_tab_right:	idem, but for the right side of the tabline

  airline_tabsel:	highlighting group of the selected item
  airline_tabsel_right: idem, but for the right side of the tabline
  airline_tabmod:       highlighting group for a 'modified' buffer
  airline_tabmod_right: idem, but on the right side
  airline_tabmod_unsel: unselected tab with modified buffer
  airline_tabmod_unsel_right: (unused)
  airline_tabtype:      label group used by ctrlspace and tabws
  airline_tabfill:	highlighting group for the filler space
  airline_tablabel:     highlighting group for the label
  airline_tablabel_right: highlighting group for the label on the right side
  airline_tabhid:	hidden buffer
  airline_tabhid_right: idem, but on the right

-------------------------------------                      *airline-scrollbar*

Displays an Ascii Scrollbar for active windows with a width > 200.

* enable/disable scrollbar integration >
  let g:airline#extensions#scrollbar#enabled = 1 (default: 0)
* set minimum window width, below which the scollbar
  will be disabled >
  let g:airline#extensions#scrollbar#minwidth = 100 (default: 200)

-------------------------------------                        *airline-taboo*
taboo.vim <https://github.com/gcmt/taboo.vim>

* enable/disable taboo.vim integration >
  let g:airline#extensions#taboo#enabled = 1
<
-------------------------------------                        *airline-term*
Vim-Airline comes with a small extension for the styling the builtin
|terminal|. This requires Nvim or a Vim compiled with terminal support.

* enable/disable terminal integration >
  let g:airline#extensions#term#enabled = 1
  default: 1

-------------------------------------                        *airline-tabws*
vim-tabws <https://github.com/s1341/vim-tabws>

* enable/disable tabws integration >
  let g:airline#extensions#tabws#enabled = 1
<
-------------------------------------                       *airline-tagbar*
tagbar <https://github.com/majutsushi/tagbar>

* enable/disable tagbar integration >
  let g:airline#extensions#tagbar#enabled = 1
<
* change how tags are displayed (:help tagbar-statusline) >
  let g:airline#extensions#tagbar#flags = ''  (default)
  let g:airline#extensions#tagbar#flags = 'f'
  let g:airline#extensions#tagbar#flags = 's'
  let g:airline#extensions#tagbar#flags = 'p'
<
* configure how to search for the nearest tag (:help tagbar-statusline) >
  let g:airline#extensions#tagbar#searchmethod = 'nearest-stl' (default)
  let g:airline#extensions#tagbar#searchmethod = 'nearest'
  let g:airline#extensions#tagbar#searchmethod = 'scoped-stl'
<
-------------------------------------                       *airline-taglist*
taglist <https://github.com/yegappan/taglist>

* enable/disable taglist integration >
  let g:airline#extensions#taglist#enabled = 1
<
-------------------------------------                     *airline-tmuxline*
tmuxline <https://github.com/edkolev/tmuxline.vim>

* enable/disable tmuxline integration >
  let g:airline#extensions#tmuxline#enabled = 0
<
* configure which mode colors should be used in tmux statusline >
  let airline#extensions#tmuxline#color_template = 'normal' (default)
  let airline#extensions#tmuxline#color_template = 'insert'
  let airline#extensions#tmuxline#color_template = 'visual'
  let airline#extensions#tmuxline#color_template = 'replace'
<
* if specified, setting this option will trigger writing to the file whenever the
  airline theme is applied, i.e. when :AirlineTheme is executed and on vim
  startup >
  airline#extensions#tmuxline#snapshot_file =
   \  "~/.tmux-statusline-colors.conf"
<
-------------------------------------                     *airline-undotree*
Undotree <https://github.com/mbbill/undotree>

No configuration available.

-------------------------------------                     *airline-unicode*
Unicode <https://github.com/chrisbra/unicode.vim>

No configuration available.

-------------------------------------                     *airline-unite*
Unite <https://github.com/Shougo/unite.vim>

* enable/disable unite integration >
  let g:airline#extensions#unite#enabled = 1

-------------------------------------                     *airline-vim9lsp*
vim9lsp <https://github.com/yegappan/lsp>

* enable/disable vim9lsp integration >
  let airline#extensions#vim9lsp#enabled = 1
<
* vim9lsp error_symbol >
  let airline#extensions#vim9lsp#error_symbol = 'E:'
<
* vim9lsp warning >
  let airline#extensions#vim9lsp#warning_symbol = 'W:'
<
-------------------------------------                     *airline-vimagit*
vimagit <https://github.com/jreybert/vimagit>

* enable/disable vimagit integration >
  let g:airline#extensions#vimagit#enabled = 1
<
-------------------------------------                    *airline-vimcmake*
Vim-CMake <https://github.com/cdelledonne/vim-cmake>

* enable/disable Vim-CMake integration >
  let g:airline#extensions#vimcmake#enabled = 1
<
-------------------------------------                      *airline-vimtex*
vimtex <https://github.com/lervag/vimtex>

Shows the current file's vimtex related info.

* enable/disable vimtex integration >
  let g:airline#extensions#vimtex#enabled = 1
<
* left and right delimiters (shown only when status string is not empty) >
  let g:airline#extensions#vimtex#left = "{"
  let g:airline#extensions#vimtex#right = "}"

State indicators:

* the current tex file is the main project file
  (nothing is shown by default) >
  let g:airline#extensions#vimtex#main = ""

* the current tex file is a subfile of the project
  and the compilation is set for the main file >
  let g:airline#extensions#vimtex#sub_main = "m"

* the current tex file is a subfile of the project
  and the compilation is set for this subfile >
  let g:airline#extensions#vimtex#sub_local = "l"

* single compilation is running >
  let g:airline#extensions#vimtex#compiled = "c₁"

* continuous compilation is running >
  let g:airline#extensions#vimtex#continuous = "c"

* viewer is opened >
  let g:airline#extensions#vimtex#viewer = "v"

* use vimtex specific wordcount function
  for TeX buffers Note: this more accurate
  but may slow down Vim) >
  let g:airline#extensions#vimtex#wordcount = 1

-------------------------------------                   *airline-virtualenv*
virtualenv <https://github.com/jmcantrell/vim-virtualenv>

* enable/disable virtualenv integration >
  let g:airline#extensions#virtualenv#enabled = 1
<
* enable virtualenv for additional filetypes:
  (default: python): >
  let g:airline#extensions#virtualenv#ft = ['python', 'markdown', 'rmd']
<
-------------------------------------                   *airline-vista*
vista.vim <https://github.com/liuchengxu/vista.vim>

* enable/disable vista integration >
  let g:airline#extensions#vista#enabled = 1

-------------------------------------                   *airline-whitespace*
* enable/disable detection of whitespace errors. >
  let g:airline#extensions#whitespace#enabled = 1
<
* disable detection of whitespace errors. >
  " useful to call for particular file types (e.g., in "ftplugin/*")
  silent! call airline#extensions#whitespace#disable()
<
* customize the type of mixed indent checking to perform. >
  " must be all spaces or all tabs before the first non-whitespace character
  let g:airline#extensions#whitespace#mixed_indent_algo = 0 (default)

  " certain number of spaces are allowed after tabs, but not in between
  " this algorithm works well for /* */ style comments in a tab-indented file
  let g:airline#extensions#whitespace#mixed_indent_algo = 1

  " spaces are allowed after tabs, but not in between
  " this algorithm works well with programming styles that use tabs for
  " indentation and spaces for alignment
  let g:airline#extensions#whitespace#mixed_indent_algo = 2
<
* customize the whitespace symbol. >
  let g:airline#extensions#whitespace#symbol = '!'
<
* configure which whitespace checks to enable. >
  " indent: mixed indent within a line
  " long:   overlong lines
  " trailing: trailing whitespace
  " mixed-indent-file: different indentation in different lines
  " conflicts: checks for conflict markers
  let g:airline#extensions#whitespace#checks =
    \  [ 'indent', 'trailing', 'long', 'mixed-indent-file', 'conflicts' ]

  " this can also be configured for an individual buffer
  let b:airline_whitespace_checks =
    \  [ 'indent', 'trailing', 'long', 'mixed-indent-file', 'conflicts ]
<
* configure the max number of lines where whitespace checking is enabled. >
  let g:airline#extensions#whitespace#max_lines = 20000
<
* configure whether a message should be displayed. >
  let g:airline#extensions#whitespace#show_message = 1
<
* configure the formatting of the warning messages. >
  let g:airline#extensions#whitespace#trailing_format = 'trailing[%s]'
  let g:airline#extensions#whitespace#mixed_indent_format =
     \ 'mixed-indent[%s]'
  let g:airline#extensions#whitespace#long_format = 'long[%s]'
  let g:airline#extensions#whitespace#mixed_indent_file_format =
     \ 'mix-indent-file[%s]'
  let g:airline#extensions#whitespace#conflicts_format = 'conflicts[%s]'

* configure custom trailing whitespace regexp rule >
  let g:airline#extensions#whitespace#trailing_regexp = '\s$'

  " this can also be configured for an individual buffer
  let b:airline_whitespace_trailing_regexp = '\s$'

* configure, which filetypes have special treatment of /* */ comments,
  matters for mix-indent-file algorithm: >
  let airline#extensions#c_like_langs =
     \ ['arduino', 'c', 'cpp', 'cuda', 'go', 'javascript', 'ld', 'php']
<
* disable whitespace checking for an individual buffer >
  " Checking is enabled by default because b:airline_whitespace_disabled
  " is by default not defined:
  unlet b:airline_whitespace_disabled

  " If b:airline_whitespace_disabled is defined and is non-zero for a buffer,
  " then whitespace checking will be disabled for that buffer; for example:
  " let b:airline_whitespace_disabled = 1
<
* disable specific whitespace checks for individual filetypes >
  " The global variable g:airline#extensions#whitespace#skip_indent_check_ft
  " defines what whitespaces checks to skip per filetype.
  " the list can contain any of the available checks,
  " (see above at g:airline#extensions#whitespace#checks)
  " To disable mixed-indent-file for go files use:
  let g:airline#extensions#whitespace#skip_indent_check_ft =
   \  {'go': ['mixed-indent-file']}
<
-------------------------------------                   *airline-windowswap*
vim-windowswap <https://github.com/wesQ3/vim-windowswap>

* enable/disable vim-windowswap integration >
  let g:airline#extensions#windowswap#enabled = 1

* set marked window indicator string >
  let g:airline#extensions#windowswap#indicator_text = 'WS'
<
-------------------------------------                    *airline-wordcount*
* enable/disable word counting of the document/visual selection >
  let g:airline#extensions#wordcount#enabled = 1
<
* set list of filetypes for which word counting is enabled: >
  " The default value matches filetypes typically used for documentation
  " such as markdown and help files. Default is:
  let g:airline#extensions#wordcount#filetypes =
    \ ['asciidoc', 'help', 'mail', 'markdown', 'rmd', 'nroff', 'org', 'plaintex', 'rst', 'tex', 'text'])
  " Use ['all'] to enable for all filetypes.

* defines the name of a formatter for word count will be displayed: >
  " The default will try to guess LC_NUMERIC and format number accordingly
  " e.g. 1,042 in English and 1.042 in German locale
  let g:airline#extensions#wordcount#formatter = 'default'

  " enable reading time formatter
  let g:airline#extensions#wordcount#formatter = 'readingtime'

  " here is how you can define a 'foo' formatter:
  " create a file in autoload/airline/extensions/wordcount/formatters/
  " called foo.vim, which defines the following function signature:
  function! airline#extensions#wordcount#formatters#foo#to_string(wordcount)
    return a:wordcount == 0 ? 'NONE' :
        \ a:wordcount > 100 ? 'okay' : 'not enough')
  endfunction
  let g:airline#extensions#wordline#formatter = 'foo'
  " The function is passed the word count of the document or visual selection

* defines how to display the wordcount statistics for the default formatter >
  " Defaults are below.  If fmt_short isn't defined, fmt is used.
  " '%s' will be substituted by the word count
  " fmt_short is displayed when window width is less than 80
  let g:airline#extensions#wordcount#formatter#default#fmt = '%s words'
  let g:airline#extensions#wordcount#formatter#default#fmt_short = '%sW'
<
-------------------------------------                     *airline-xkblayout*

The vim-xkblayout extension will only be enabled, if the global variable
`g:XkbSwitchLib` is set. It should be set to a C library that will be called
using |libcall()| with the function name `Xkb_Switch_getXkbLayout`. For
details on how to use it, see e.g. <https://github.com/ierton/xkb-switch>

* enable/disable vim-xkblayout extension >
  let g:airline#extensions#xkblayout#enabled = 1

* redefine keyboard layout short codes to shown in status >
  let g:airline#extensions#xkblayout#short_codes =
    \  {'Russian-Phonetic': 'RU', 'ABC': 'EN'}
<
  'RU' instead of system 'Russian-Phonetic',
  'EN' instead of system 'ABC'.

  Default: >
  let g:airline#extensions#xkblayout#short_codes =
    \ {'2SetKorean': 'KR', 'Chinese': 'CN', 'Japanese': 'JP'}

* define path to the backend switcher library
  Linux (Install https://github.com/ierton/xkb-switch): >
   let g:XkbSwitchLib = '/usr/local/lib/libxkbswitch.so'
<
  macOS (Install https://github.com/vovkasm/input-source-switcher): >
   let g:XkbSwitchLib = '/usr/local/lib/libInputSourceSwitcher.dylib'

-------------------------------------                     *airline-xtabline*
xtabline <https://github.com/mg979/vim-xtabline>

This is a simplified and stand-alone version of the original extension.
The bigger version adds fzf commands, session management, tab bookmarks, and
features that you may not need. They both require |vim-airline| anyway.

Main features and default mappings of this extension are:

* tab cwd persistence, also across sessions if vim-obsession is being used.

* buffer filtering in the tabline: only buffers whose path is within the tab
  cwd will be shown in the tabline.

* toggle tabs/buffer view on the tabline, toggle buffer filtering:
>
  nmap <F5>          <Plug>XTablineToggleTabs
  nmap <leader><F5>  <Plug>XTablineToggleFiltering

* reopen last closed tab, restoring its cwd and buffers:
>
  nmap <leader>tr    <Plug>XTablineReopen <SID>ReopenLastTab

* switch among filtered buffers (accepts count):
>
  nmap ]l            <Plug>XTablineNextBuffer
  nmap [l            <Plug>XTablinePrevBuffer

* go to N buffer (a count must be provided):
>
  nmap <BS>          <Plug>XTablineSelectBuffer

* alternative command if count is not provided:
>
  let g:xtabline_alt_action = "buffer #"

Note: Make sure to also enable >
  :let g:airline#extensions#tabline#show_buffers = 1
otherwise the tabline might not actually be displayed correctly (see
|airline-tabline|)

* exclude fugitive logs and files that share part of the real buffer path:
>
  let g:xtabline_include_previews = 0           (default 1)

* activate fast cwd selection mappings:
>
  let g:xtabline_cd_commands = 1                (default 0)

* default mappings for them are:
>
  map <leader>cdc       <Plug>XTablineCdCurrent
  map <leader>cdd       <Plug>XTablineCdDown1
  map <leader>cd2       <Plug>XTablineCdDown2
  map <leader>cd3       <Plug>XTablineCdDown3
  map <leader>cdh       <Plug>XTablineCdHome

Note: if you don't use these mappings and change the cwd, the tabline won't
be updated automatically. Either re-enter the tab or press <F5> two times.

* here are some easier mappings to change tab buffer:
>
  nnoremap <silent> <expr> <Right> v:count ?
   \ airline#extensions#tabline#xtabline#next_buffer(v:count) : "\<Right>"
  nnoremap <silent> <expr> <Left>  v:count ?
   \ airline#extensions#tabline#xtabline#prev_buffer(v:count) : "\<Left>"

-------------------------------------                    *airline-ycm*
YouCompleteMe <https://github.com/ycm-core/YouCompleteMe>

Shows number of errors and warnings in the current file detected by YCM.

* enable/disable YCM integration >
  let g:airline#extensions#ycm#enabled = 1

* set error count prefix >
  let g:airline#extensions#ycm#error_symbol = 'E:'

* set warning count prefix >
  let g:airline#extensions#ycm#warning_symbol = 'W:'
<

-------------------------------------                    *airline-zoomwintab*
zoomwintab <https://github.com/troydm/zoomwintab.vim>

* enable/disable zoomwintab integration >
  let g:airline#extensions#zoomwintab#enabled = 1

* zoomwintab's zoomin symbol >
  let g:airline#extensions#zoomwintab#status_zoomed_in = 'Currently Zoomed In'

default: '> Zoomed'

* zoomwintab's zoomout symbol >
  let g:airline#extensions#zoomwintab#status_zoomed_out = 'Currently Zoomed Out'

default: ''

=============================================================================
ADVANCED CUSTOMIZATION                      *airline-advanced-customization*

The defaults will accommodate the mass majority of users with minimal
configuration. However, if you want to reposition sections or contents you
can do so with built-in helper functions, which makes it possible to create
sections in a more declarative style.

-------------------------------------                        *airline-parts*
A part is something that contains metadata that eventually gets rendered into
the statusline. You can define parts that contain constant strings or
functions. Defining parts is needed if you want to use features like automatic
insertion of separators or hiding based on window width.

For example, this is how you would define a part function: >
  call airline#parts#define_function('foo', 'GetFooText')
<
Here is how you would define a part that is visible only if the window width
greater than a minimum width. >
  call airline#parts#define_minwidth('foo', 50)
<
Parts can be configured to be visible conditionally. >
  call airline#parts#define_condition('foo', 'getcwd() =~ "work_dir"')
<
Now add part "foo" to section airline_section_y: >
  let g:airline_section_y = airline#section#create_right(['ffenc','foo'])
<
Note: Part definitions are combinative; e.g. the two examples above modify
the same `foo` part.

Note: Look at the source code and tests for the full API.

-------------------------------------             *airline-predefined-parts*
The following list of parts are predefined by vim-airline.

* `mode`         displays the current mode
* `iminsert`     displays the current insert method
* `paste`        displays the paste indicator
* `crypt`        displays the crypted indicator
* `spell`        displays the spell indicator
* `filetype`     displays the file type
* `readonly`     displays the read only indicator
* `file`         displays the filename and modified indicator
* `path`         displays the filename (absolute path) and modifier indicator
* `linenr`       displays the current line number
* `maxlinenr`    displays the number of lines in the buffer
* `ffenc`        displays the file format and encoding

And the following are defined for their respective extensions:

`ale_error_count` `ale_warning_count` `branch` `eclim` `hunks`
`languageclient_error_count` `languageclient_warning_count` `lsp_error_count`
`lsp_warning_count``neomake_error_count` `neomake_warning_count`
`nvimlsp_error_count` `nvimlsp_warning_count` `obsession`
`syntastic-warn` `syntastic-err` `tagbar` `whitespace` `windowswap`
`ycm_error_count` `ycm_warning_count`

-------------------------------------                      *airline-accents*
Accents can be defined on any part, like so: >
  call airline#parts#define_accent('foo', 'red')
<
This will override the colors of that part by using what is defined in that
particular accent. In the above example, the `red` accent is used, which
means regardless of which section the part is used in, it will have red
foreground colors instead of the section's default foreground color.

The following accents are defined by default. Themes can define their
variants of the colors, but defaults will be provided if missing. >
  bold, italic, red, green, blue, yellow, orange, purple, none
<
The defaults configure the mode and line number parts to be bold, and the
readonly part to be red.

"none" is special. This can be used, to remove a bold accent from an existing
theme. For example, the mode part of the statusline is usually defined to be
bold. However, it can be hard to remove an existing bold accent from the
default configuration. Therefore, you can use the none accent to remove
existing accents, so if you put >
    call airline#parts#define_accent('mode', 'none')
the mode section will be set to non-bold font style.

-------------------------------------                     *airline-sections*
Once a part is defined, you can use helper functions to generate the
statuslines for each section. For example, to use the part above, we could
define a section like this: >
  function! AirlineInit()
    let g:airline_section_a = airline#section#create(['mode', ' ', 'foo'])
    let g:airline_section_b = airline#section#create_left(['ffenc','file'])
    let g:airline_section_c = airline#section#create(['%{getcwd()}'])
  endfunction
  autocmd User AirlineAfterInit call AirlineInit()
<
This will create a section with the `mode`, followed by a space, and our
`foo` part in section `a`. Section `b` will have two parts with a left-side
separator. And section `c` will contain the current path. You may notice that
the space and cwd are not defined parts. For convenience, if a part of that
key does not exist, it will be inserted as is. The unit tests will be a good
resource for possibilities.

Note: The use of |User| is important, because most extensions are lazily
loaded, so we must give them a chance to define their parts before we can use
them. Also this autocommand is only triggered, after the airline functions
are actually available on startup.

Note: The `airline#section#create` function and friends will do its best to
create a section with the appropriate separators, but it only works for
function and text parts. Special 'statusline' items like %f or raw/undefined
parts will not work as it is not possible to inspect their widths/contents
before rendering to the statusline.

=============================================================================
FUNCREFS                                                  *airline-funcrefs*

vim-airline internally uses funcrefs to integrate with third party plugins,
and you can tap into this functionality to extend it for you needs. This is
the most powerful way to customize the statusline, and sometimes it may be
easier to go this route than the above methods.

Every section can have two values. The default value is the global `g:`
variable which is used in the absence of a `w:` value. This makes it very
easy to override only certain parts of the statusline by only defining
window-local variables for a subset of all sections.

-------------------------------------                  *add_statusline_func*
                                              *add_inactive_statusline_func*
The following is an example of how you can extend vim-airline to support a
new plugin. >
  function! MyPlugin(...)
    if &filetype == 'MyPluginFileType'
      let w:airline_section_a = 'MyPlugin'
      let w:airline_section_b = '%f'
      let w:airline_section_c = '%{MyPlugin#function()}'
      let g:airline_variable_referenced_in_statusline = 'foo'
    endif
  endfunction
  call airline#add_statusline_func('MyPlugin')
<
Notice that only the left side of the statusline is overwritten. This means
the right side (the line/column numbers, etc) will be intact.

To have the function act only on statuslines of inactive functions, use
`airline#add_inactive_statusline_func('MyPlugin')`

-------------------------------------               *remove_statusline_func*
You can also remove a function as well, which is useful for when you want a
temporary override. >
  call airline#remove_statusline_func('MyPlugin')
<
=============================================================================
PIPELINE                                                  *airline-pipeline*

Sometimes you want to do more than just use overrides. The statusline funcref
is invoked and passed two arguments.  The first of these arguments is the
statusline builder.  You can use this to build completely custom statuslines
to your liking.  Here is an example: >
>
  function! MyPlugin(...)
    " first variable is the statusline builder
    let builder = a:1

    " WARNING: the API for the builder is not finalized and may change
    call builder.add_section('Normal', '%f')
    call builder.add_section('WarningMsg', '%{getcwd()}')
    call builder.split()
    call builder.add_section('airline_z', '%p%%')

    " tell the core to use the contents of the builder
    return 1
  endfunction
<
The above example uses various example highlight groups to demonstrate
that you can use any combination from the loaded colorscheme. However, if
you want colors to change between modes, you should use one of the section
highlight groups, e.g. `airline_a` and `airline_b`.

The second variable is the context, which is a dictionary containing various
values such as whether the statusline is active or not, and the window
number.
>
  context = {
    'winnr': 'the window number for the statusline',
    'active': 'whether the window is active or not',
    'bufnr': 'the current buffer for this window',
  }
<
-------------------------------------        *airline-pipeline-return-codes*
The pipeline accepts various return codes and can be used to determine the
next action.  The following are the supported codes: >
   0   the default, continue on with the next funcref
  -1   do not modify the statusline
   1   modify the statusline with the current contents of the builder
<
Note: Any value other than 0 will halt the pipeline and prevent the next
funcref from executing.

=============================================================================
WRITING EXTENSIONS                              *airline-writing-extensions*

For contributions into the plugin, here are the following guidelines:

1.  For simple 'filetype' checks, they can be added directly into the
`extensions.vim` file.

2.  Pretty much everything else should live as a separate file under the
`extensions/` directory.

  a.  Inside `extensions.vim`, add a check for some variable or command that
      is always available (these must be defined in `plugin/`, and _not_
      `autoload/` of the other plugin).  If it exists, then initialize the
      extension. This ensures that the extension is loaded if and only if the
      user has the other plugin installed.  Also, a check to
      `airline#extensions#foo_plugin#enabled` should be performed to allow
      the user to disable it.

  b.  Configuration variables for the extension should reside in the
      extension, e.g. `g:airline#extensions#foo_plugin#bar_variable`.

See the source of |example.vim| for documented code of how to write one.
Looking at the other extensions is also a good resource.

=============================================================================
WRITING THEMES                                              *airline-themes*

Themes are written "close to the metal" -- you will need to know some basic
VimL syntax to write a theme, but if you've written in any programming
language before it will be easy to pick up.

The |dark.vim| theme fully documents this procedure and will guide you
through the process.

For other examples, you can visit the official themes repository at
<https://github.com/vim-airline/vim-airline-themes>.  It also includes
examples such as |jellybeans.vim| which define colors by extracting highlight
groups from the underlying colorscheme.

=============================================================================
TROUBLESHOOTING                                    *airline-troubleshooting*

Q. There are no colors.
A. You need to set up your terminal correctly.  For more details, see
   <http://vim.wikia.com/wiki/256_colors_in_vim>.  Alternatively, if you want
   to bypass the automatic detection of terminal colors, you can force Vim
   into 256 color mode with this: >
  set t_Co=256
<
  Also if you enable true color mode in your terminal, make sure it will work
  correctly with your terminal. Check if it makes a difference without it: >
  set notermguicolors

Q. Powerline symbols are not showing up.
A. First, you must install patched powerline fonts. Second, you must enable
   unicode in vim.  >
  set encoding=utf-8
<
Q. There is a pause when leaving insert mode.
A. Add the following to your vimrc.  >
  set ttimeoutlen=50
<
Q. The colors look a little off for some themes.
A. Certain themes are derived from the active colorscheme by extracting
   colors from predefined highlight groups.  These airline themes will look
   good for their intended matching colorschemes, but will be hit or miss
   when loaded with other colorschemes.

Q. Themes are missing
A. Themes have been extracted into the vim-airlines-themes repository. Simply
   clone https://github.com/vim-airline/vim-airline-themes and everything
   should work again.

Q. Performance is bad
A. Check the question at the wiki:
   https://github.com/vim-airline/vim-airline/wiki/FAQ#i-have-a-performance-problem

Q. Something strange happens on certain autocommands
A. Try to disable the autocommand by setting the 'eventignore' option like
   this: >
   set eventignore+=FocusGained

Solutions to other common problems can be found in the Wiki:
<https://github.com/vim-airline/vim-airline/wiki/FAQ>

=============================================================================
CONTRIBUTIONS                                        *airline-contributions*

Contributions and pull requests are welcome.

=============================================================================
LICENSE                                                    *airline-license*

MIT License. Copyright © 2013-2021 Bailey Ling, Christian Brabandt, Mike
Hartington et al.

 vim:tw=78:ts=8:ft=help:norl: