Move vim-airline theme into main onedark.vim repo.

Closes #53 and implements #16.

README.md

@@ -4,13 +4,6 @@ A dark Vim color scheme for the GUI and 16/256-color terminals, based on [FlatCo
 
 ![onedark.vim Preview](https://raw.githubusercontent.com/joshdick/onedark.vim/master/preview.png)
 
-Preview image taken using:
-
-* [iTerm2](https://iterm2.com) terminal emulator on Mac OS X
-* 12 pt. [PragmataPro Mono](http://www.fsd.it/fonts/pragmatapro.htm#.VlDa1q6rTOY) font
-* [airline-onedark.vim](https://github.com/joshdick/airline-onedark.vim) theme for [vim-airline](https://github.com/bling/vim-airline)
-* [vim-polyglot](https://github.com/sheerun/vim-polyglot) plug-in
-
 ## Installation
 
 1. If you use Vim in the terminal, determine whether [your terminal emulator has 24-bit color ("true color") support](https://gist.github.com/XVilka/8346728).
@@ -78,5 +71,30 @@ Preview image taken using:
 
 ## vim-airline Theme
 
-A companion [vim-airline](https://github.com/bling/vim-airline) theme for this color scheme is available at [joshdick/airline-onedark.vim](https://github.com/joshdick/airline-onedark.vim).
+![airline-onedark.vim Preview](https://raw.github.com/joshdick/onedark.vim/master/preview_airline.png)
 
+This repository includes a companion [vim-airline](https://github.com/bling/vim-airline) theme for use with onedark.vim.
+
+The vim-airline theme:
+
+* Depends on onedark.vim for its colors, and must therefore be used in conjunction with it.
+* Works with both color modes available in onedark.vim (16 or 256 colors), as specified in the configuration for onedark.vim.
+* Is based on vim-airline's ["tomorrow" theme](https://github.com/bling/vim-airline/blob/master/autoload/airline/themes/tomorrow.vim).
+
+### Installation
+
+(These instructions assume that vim-airline and onedark.vim are already installed and configured to your liking.)
+
+Place `onedark.vim` in your `~/.vim/autoload/airline/themes/` directory either manually or by using your Vim plug-in manager of choice, then add the following line to your `~/.vimrc`:
+
+    ```vim
+    let g:airline_theme='onedark'
+    ```
+
+---
+
+Preview images were taken using:
+
+* [iTerm2](https://iterm2.com) terminal emulator on Mac OS X
+* 12 pt. [PragmataPro Mono](http://www.fsd.it/fonts/pragmatapro.htm#.VlDa1q6rTOY) font
+* [vim-polyglot](https://github.com/sheerun/vim-polyglot) plug-in

autoload/airline/themes/onedark.vim

@@ -0,0 +1,52 @@
+" [onedark.vim](https://github.com/joshdick/airline-onedark.vim/)
+
+" This is a [vim-airline](https://github.com/bling/vim-airline) theme for use with
+" the [onedark.vim](https://github.com/joshdick/onedark.vim) colorscheme.
+
+" It is based on vim-airline's ["tomorrow" theme](https://github.com/bling/vim-airline/blob/master/autoload/airline/themes/tomorrow.vim).
+
+let g:airline#themes#onedark#palette = {}
+
+function! airline#themes#onedark#refresh()
+  let g:airline#themes#onedark#palette.accents = {
+        \ 'red': airline#themes#get_highlight('Constant'),
+        \ }
+
+  let s:N1 = airline#themes#get_highlight2(['Normal', 'bg'], ['String', 'fg'])
+  let s:N2 = airline#themes#get_highlight('Pmenu')
+  let s:N3 = airline#themes#get_highlight('String')
+  let g:airline#themes#onedark#palette.normal = airline#themes#generate_color_map(s:N1, s:N2, s:N3)
+
+  let group = airline#themes#get_highlight('vimCommand')
+  let g:airline#themes#onedark#palette.normal_modified = {
+        \ 'airline_c': [ group[0], '', group[2], '', '' ]
+        \ }
+
+  let s:I1 = airline#themes#get_highlight('Cursor')
+  let s:I2 = s:N2
+  let s:I3 = airline#themes#get_highlight2(['Cursor', 'bg'], ['Normal', 'bg'])
+  let g:airline#themes#onedark#palette.insert = airline#themes#generate_color_map(s:I1, s:I2, s:I3)
+  let g:airline#themes#onedark#palette.insert_modified = g:airline#themes#onedark#palette.normal_modified
+
+  let s:R1 = airline#themes#get_highlight2(['Normal', 'bg'], ['Error', 'fg'])
+  let s:R2 = s:N2
+  let s:R3 = airline#themes#get_highlight('Error')
+  let g:airline#themes#onedark#palette.replace = airline#themes#generate_color_map(s:R1, s:R2, s:R3)
+  let g:airline#themes#onedark#palette.replace_modified = g:airline#themes#onedark#palette.normal_modified
+
+  let s:V1 = airline#themes#get_highlight2(['Normal', 'bg'], ['Statement', 'fg'])
+  let s:V2 = s:N2
+  let s:V3 = airline#themes#get_highlight2(['Statement', 'fg'], ['Normal', 'bg'])
+  let g:airline#themes#onedark#palette.visual = airline#themes#generate_color_map(s:V1, s:V2, s:V3)
+  let g:airline#themes#onedark#palette.visual_modified = g:airline#themes#onedark#palette.normal_modified
+
+  let s:IA1 = airline#themes#get_highlight2(['Normal', 'bg'], ['Normal', 'fg'])
+  let s:IA2 = airline#themes#get_highlight2(['Normal', 'fg'], ['Visual', 'bg'])
+  let s:IA3 = s:N2
+  let g:airline#themes#onedark#palette.inactive = airline#themes#generate_color_map(s:IA1, s:IA2, s:IA3)
+  let g:airline#themes#onedark#palette.inactive_modified = {
+        \ 'airline_c': [ group[0], '', group[2], '', '' ]
+        \ }
+endfunction
+
+call airline#themes#onedark#refresh()