coc: add in coc_status to coc.nvim integration

Allow to show additional messages from coc.nvim in section_c

For ease of use, shorten the message for windows smaller than 81
characters.

closes #2079

autoload/airline/extensions/coc.vim

@@ -7,16 +7,16 @@ scriptencoding utf-8
 let s:error_symbol = get(g:, 'airline#extensions#coc#error_symbol', 'E:')
 let s:warning_symbol = get(g:, 'airline#extensions#coc#warning_symbol', 'W:')
 
-function! airline#extensions#coc#get_warning()
+function! airline#extensions#coc#get_warning() abort
   return airline#extensions#coc#get('warning')
 endfunction
 
-function! airline#extensions#coc#get_error()
+function! airline#extensions#coc#get_error() abort
   return airline#extensions#coc#get('error')
 endfunction
 
-function! airline#extensions#coc#get(type)
-  if !exists(":CocCommand")
+function! airline#extensions#coc#get(type) abort
+  if !exists(':CocCommand')
     return ''
   endif
   let _backup = get(g:, 'coc_stl_format', '')
@@ -42,7 +42,13 @@ function! airline#extensions#coc#get(type)
   endif
 endfunction
 
-function! airline#extensions#coc#init(ext)
+function! airline#extensions#coc#get_status() abort
+  " Shorten text for windows < 81 characters
+  return airline#util#shorten(get(g:, 'coc_status', ''), 81, 9)
+endfunction
+
+function! airline#extensions#coc#init(ext) abort
   call airline#parts#define_function('coc_error_count', 'airline#extensions#coc#get_error')
   call airline#parts#define_function('coc_warning_count', 'airline#extensions#coc#get_warning')
+  call airline#parts#define_function('coc_status', 'airline#extensions#coc#get_status')
 endfunction

autoload/airline/init.vim

@@ -161,6 +161,10 @@ function! airline#init#bootstrap()
   call airline#parts#define('branch', {
         \ 'raw': '',
         \ 'minwidth': 80})
+  call airline#parts#define('coc_status', {
+        \ 'raw': '',
+        \ 'accent': 'airline_term'
+        \ })
   call airline#parts#define_empty(['obsession', 'tagbar', 'syntastic-warn',
         \ 'syntastic-err', 'eclim', 'whitespace','windowswap',
         \ 'ycm_error_count', 'ycm_warning_count', 'neomake_error_count',
@@ -194,7 +198,7 @@ function! airline#init#sections()
     if exists("+autochdir") && &autochdir == 1
       let g:airline_section_c = airline#section#create(['%<', 'path', spc, 'readonly'])
     else
-      let g:airline_section_c = airline#section#create(['%<', 'file', spc, 'readonly'])
+      let g:airline_section_c = airline#section#create(['%<', 'file', spc, 'readonly', 'coc_status'])
     endif
   endif
   if !exists('g:airline_section_gutter')

t/init.vim

@@ -29,8 +29,8 @@ describe 'init sections'
     Expect g:airline_section_b == ''
   end
 
-  it 'section c should be file'
-    Expect g:airline_section_c == '%<%f%m %#__accent_red#%{airline#util#wrap(airline#parts#readonly(),0)}%#__restore__#'
+  it 'section c should be file and coc_status'
+    Expect g:airline_section_c == '%<%f%m %#__accent_red#%{airline#util#wrap(airline#parts#readonly(),0)}%#__restore__#%#__accent_airline_term#%#__restore__#'
   end
 
   it 'section x should be filetype'
@@ -78,6 +78,7 @@ describe 'init sections'
     Expect airline#parts#get('ycm_warning_count').raw == ''
     Expect airline#parts#get('languageclient_error_count').raw == ''
     Expect airline#parts#get('languageclient_warning_count').raw == ''
+    Expect airline#parts#get('coc_status').raw == ''
   end
 end