onedark.vim: Add 16-color support

autoload/airline/themes/onedark.vim

@@ -6,15 +6,35 @@
 " It is based on vim-airline's ["tomorrow" theme](https://github.com/vim-airline/vim-airline-themes/blob/master/autoload/airline/themes/tomorrow.vim).
 function! airline#themes#onedark#refresh()
 
+  if get(g:, 'onedark_termcolors', 256) == 16
+    let s:term_red = 1
+    let s:term_green = 2
+    let s:term_yellow = 3
+    let s:term_blue = 4
+    let s:term_purple = 5
+    let s:term_white = 7
+    let s:term_black = 0
+    let s:term_grey = 8
+  else
+    let s:term_red = 204
+    let s:term_green = 114
+    let s:term_yellow = 180
+    let s:term_blue = 39
+    let s:term_purple = 170
+    let s:term_white = 145
+    let s:term_black = 235
+    let s:term_grey = 236
+  endif
+
   let g:airline#themes#onedark#palette = {}
 
   let g:airline#themes#onedark#palette.accents = {
-        \ 'red': [ '#E06C75', '', 204, 0 ]
+        \ 'red': [ '#E06C75', '', s:term_red, 0 ]
         \ }
 
-  let s:N1 = [ '#282C34', '#98C379', 235, 114 ]
+  let s:N1 = [ '#282C34', '#98C379', s:term_black, s:term_green ]
-  let s:N2 = [ '#ABB2BF', '#3E4452', 145, 237 ]
+  let s:N2 = [ '#ABB2BF', '#3E4452', s:term_white, s:term_grey ]
-  let s:N3 = [ '#98C379', '#282C34', 114, 235 ]
+  let s:N3 = [ '#98C379', '#282C34', s:term_green, '' ]
   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')
@@ -22,26 +42,26 @@ function! airline#themes#onedark#refresh()
         \ 'airline_c': [ group[0], '', group[2], '', '' ]
         \ }
 
-  let s:I1 = [ '#282C34', '#61AFEF', 235, 39 ]
+  let s:I1 = [ '#282C34', '#61AFEF', s:term_black, s:term_blue ]
   let s:I2 = s:N2
-  let s:I3 = [ '#61AFEF', '#282C34', 39, 235 ]
+  let s:I3 = [ '#61AFEF', '#282C34', s:term_blue, '' ]
   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 = [ '#282C34', '#E06C75', 235, 204 ]
+  let s:R1 = [ '#282C34', '#E06C75', s:term_black, s:term_red ]
   let s:R2 = s:N2
-  let s:R3 = [ '#E06C75', '#282C34', 204, 235 ]
+  let s:R3 = [ '#E06C75', '#282C34', s:term_red, '' ]
   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 = [ '#282C34', '#C678DD', 235, 170 ]
+  let s:V1 = [ '#282C34', '#C678DD', s:term_black, s:term_purple ]
   let s:V2 = s:N2
-  let s:V3 = [ '#C678DD', '#282C34', 170, 235 ]
+  let s:V3 = [ '#C678DD', '#282C34', s:term_purple, '' ]
   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 = [ '#282C34', '#ABB2BF', 235, 145 ]
+  let s:IA1 = [ '#282C34', '#ABB2BF', s:term_black, s:term_white ]
-  let s:IA2 = [ '#ABB2BF', '#3E4452', 145, 237 ]
+  let s:IA2 = [ '#ABB2BF', '#3E4452', s:term_white, s:term_grey ]
   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 = {
@@ -51,7 +71,7 @@ function! airline#themes#onedark#refresh()
   " Warning/Error styling code from vim-airline's ["base16" theme](https://github.com/vim-airline/vim-airline-themes/blob/master/autoload/airline/themes/base16.vim)
 
   " Warnings
-  let s:WI = [ '#282C34', '#E5C07B', 235, 180 ]
+  let s:WI = [ '#282C34', '#E5C07B', s:term_black, s:term_yellow ]
   let g:airline#themes#onedark#palette.normal.airline_warning = [
        \ s:WI[0], s:WI[1], s:WI[2], s:WI[3]
        \ ]
@@ -78,7 +98,7 @@ function! airline#themes#onedark#refresh()
       \ g:airline#themes#onedark#palette.normal.airline_warning
 
   " Errors
-  let s:ER = [ '#282C34', '#E06C75', 235, 204 ]
+  let s:ER = [ '#282C34', '#E06C75', s:term_black, s:term_red ]
   let g:airline#themes#onedark#palette.normal.airline_error = [
        \ s:ER[0], s:ER[1], s:ER[2], s:ER[3]
        \ ]