*airline.txt* Lean and mean status/tabline that's light as air *airline* _ _ _ _ ~ __ _(_)_ __ ___ __ _(_)_ __| (_)_ __ ___ ~ \ \ / / | '_ ` _ \ _____ / _` | | '__| | | '_ \ / _ \ ~ \ V /| | | | | | |_____| (_| | | | | | | | | | __/ ~ \_/ |_|_| |_| |_| \__,_|_|_| |_|_|_| |_|\___| ~ ~ ============================================================================== 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. ============================================================================== 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): * 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 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 < * 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 < * enable/disable automatic population of the `g:airline_symbols` dictionary with powerline symbols. > let g:airline_powerline_fonts=0 < * 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 = { \ '__' : '-', \ 'n' : 'N', \ 'i' : 'I', \ 'R' : 'R', \ 'c' : 'C', \ 'v' : 'V', \ 'V' : 'V', \ '' : 'V', \ 's' : 'S', \ 'S' : 'S', \ '' : 'S', \ } < * 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 < * defines whether the preview window should be excluded from have its window statusline modified (may help with plugins which use the preview window heavily) > let g:airline_exclude_preview = 0 < * disable the Airline customization for selective windows (this is a window-local variable so you can disable it for only some windows) > let w:airline_disabled = 1 < ============================================================================== COMMANDS *airline-commands* :AirlineTheme {theme-name} *:AirlineTheme* Displays or changes the current 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. ============================================================================== AUTOCOMMANDS *airline-autocommands* Airline comes with some user-defined autocommands. |AirlineAfterInit| after plugin is initialized, but before the statusline is replaced |AirlineToggledOn| after airline is activated and replaced the statusline |AirlineToggledOff| after airline is deactivated and the statusline is restored to the original ============================================================================== CUSTOMIZATION *airline-customization* The following are some unicode symbols for customizing the left/right separators, as well as the powerline font glyphs. 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.crypt = '🔒' let g:airline_symbols.linenr = '␊' let g:airline_symbols.linenr = '␤' let g:airline_symbols.linenr = '¶' 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.notexists = '∄' 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.readonly = '' let g:airline_symbols.linenr = '' " 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. > variable names default contents ---------------------------------------------------------------------------- let g:airline_section_a (mode, crypt, paste, iminsert) let g:airline_section_b (hunks, branch) let g:airline_section_c (bufferline or filename) let g:airline_section_gutter (readonly, csv) let g:airline_section_x (tagbar, filetype, virtualenv) let g:airline_section_y (fileencoding, fileformat) let g:airline_section_z (percentage, line number, column number) let g:airline_section_error (ycm_error_count, syntastic, eclim) let g:airline_section_warning (ycm_warning_count, whitespace) " here is an example of how you could replace the branch indicator with " the current working directory, followed by the filename. let g:airline_section_b = '%{getcwd()}' let g:airline_section_c = '%t' < ============================================================================== 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'] < ------------------------------------- *airline-default* The default extension 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': 88, \ '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-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-bufferline* 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-branch* fugitive.vim lawrencium vcscommand * 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 < ------------------------------------- *airline-syntastic* syntastic * enable/disable syntastic integration > let g:airline#extensions#syntastic#enabled = 1 < ------------------------------------- *airline-tagbar* 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' < ------------------------------------- *airline-csv* 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-hunks* vim-gitgutter vim-signify changesPlugin quickfixsigns * 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 = ['+', '~', '-'] < ------------------------------------- *airline-ctrlp* ctrlp * 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-virtualenv* virtualenv * enable/disable virtualenv integration > let g:airline#extensions#virtualenv#enabled = 1 < ------------------------------------- *airline-eclim* eclim * enable/disable eclim integration, which works well with the |airline-syntastic| extension. > let g:airline#extensions#eclim#enabled = 1 ------------------------------------- *airline-wordcount* * enable/disable word counting. > let g:airline#extensions#wordcount#enabled = 1 < * regex of filetypes to enable word counting. > " the default value matches filetypes typically used for documentation " such as markdown and help files. let g:airline#extensions#wordcount#filetypes = ... (default: markdown,rst,org,help,text) * 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' " here is how you can define a 'foo' formatter: " create a file in the dir autoload/airline/extensions/wordcount/formatters/ " called foo.vim " this example needs at least Vim > 7.4.1042 function! airline#extensions#wordcount#formatters#foo#format() return (wordcount()['words'] == 0 ? 'NONE' : \ wordcount()['words'] > 100 ? 'okay' : 'not enough') endfunction let g:airline#extensions#wordline#formatter = 'foo' < ------------------------------------- *airline-whitespace* * enable/disable detection of whitespace errors. > let g:airline#extensions#whitespace#enabled = 1 < * 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. > let g:airline#extensions#whitespace#checks = [ 'indent', 'trailing', 'long' ] < * configure the maximum 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]' * configure custom trailing whitespace regexp rule > let g:airline#extensions#whitespace#trailing_regexp = '\s$' < ------------------------------------- *airline-tabline* * enable/disable enhanced tabline. > let g:airline#extensions#tabline#enabled = 0 < * enable/disable displaying buffers with a single tab. > let g:airline#extensions#tabline#show_buffers = 1 < * enable/disable displaying tabs, regardless of number. > let g:airline#extensions#tabline#show_tabs = 1 < * 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 < * enable/disable displaying tab number in tabs mode. > let g:airline#extensions#tabline#show_tab_nr = 1 * enable/disable displaying tab type (far right) let g:airline#extensions#tabline#show_tab_type = 1 * enable/disable displaying index of the buffer. When enabled, numbers will be displayed in the tabline and mappings will be exposed to allow you to select a buffer directly. Up to 9 mappings will be exposed. let g:airline#extensions#tabline#buffer_idx_mode = 1 nmap 1 AirlineSelectTab1 nmap 2 AirlineSelectTab2 nmap 3 AirlineSelectTab3 nmap 4 AirlineSelectTab4 nmap 5 AirlineSelectTab5 nmap 6 AirlineSelectTab6 nmap 7 AirlineSelectTab7 nmap 8 AirlineSelectTab8 nmap 9 AirlineSelectTab9 nmap - AirlineSelectPrevTab nmap + AirlineSelectNextTab Note: Mappings will be ignored within a NERDTree buffer. Note: In buffer_idx_mode these mappings won't change the current tab, but switch to the buffer visible in that tab. Use |gt| for switching tabs. In tabmode, those mappings will switch to the specified tab. * defines the name of a formatter for how buffer names are displayed. > 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 only 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 `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' < * 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 unneccessary 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'. ------------------------------------- *airline-tmuxline* tmuxline * 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-promptline* promptline * 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-nrrwrgn* NrrwRgn * enable/disable NrrwRgn integration > let g:airline#extensions#nrrwrgn#enabled = 1 ------------------------------------- *airline-capslock* vim-capslock * enable/disable vim-capslock integration > let g:airline#extensions#capslock#enabled = 1 ------------------------------------- *airline-windowswap* 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-taboo* taboo.vim * enable/disable taboo.vim integration > let g:airline#extensions#taboo#enabled = 1 < ------------------------------------- *airline-ctrlspace* vim-ctrlspace * enable/disable vim-ctrlspace integration > let g:airline#extensions#ctrlspace#enabled = 1 < ------------------------------------- *airline-ycm* 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:' < ============================================================================== 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 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* Before is a list of parts that 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 * `filetype` displays the file type * `readonly` displays the read only indicator * `file` displays the filename and modified indicator * `ffenc` displays the file format and encoding And the following are defined for their respective extensions: `hunks`, `branch`, `tagbar`, `syntastic`, `whitespace` ------------------------------------- *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 < The defaults configure the mode and line number parts to be bold, and the readonly part to be red. ------------------------------------- *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 |VimEnter| is important, because most extensions are lazily loaded, so we must give them a chance to define their parts before we can use them. 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* 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. ------------------------------------- *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 . 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 . 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 < Q. The statusline does not appear until I create a split. A. This is the default setting of 'laststatus'. If you want it to appear all the time, add the following to your vimrc: > set laststatus=2 < 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. Solutions to other common problems can be found in the Wiki: ============================================================================== CONTRIBUTIONS *airline-contributions* Contributions and pull requests are welcome. ============================================================================== LICENSE *airline-license* MIT License. Copyright © 2013-2016 Bailey Ling. vim:tw=78:ts=8:ft=help:norl: