branch: display dirty state

If the repository is considered dirty, do display the
g:airline_symbols.dirty symbol right after the branch name.

autoload/airline/async.vim

@@ -6,6 +6,7 @@ scriptencoding utf-8
 let s:untracked_jobs = {}
 let s:mq_jobs        = {}
 let s:po_jobs        = {}
+let s:clean_jobs     = {}
 
 " Generic functions handling on exit event of the various async functions
 function! s:untracked_output(dict, buf)
@@ -63,6 +64,29 @@ function! airline#async#vcs_untracked(config, file, vcs)
   endif
 endfunction
 
+function! s:on_exit_clean(...) dict abort
+  let buf=self.buf
+  if !empty(buf)
+    let var=getbufvar(self.file, 'buffer_vcs_config', {})
+    let var[self.vcs].dirty=1
+    call setbufvar(self.file, 'buffer_vcs_config', var)
+    unlet! b:airline_head
+  endif
+  if has_key(get(s:clean_jobs, 'self.vcs', {}), self.file)
+    call remove(s:clean_jobs[self.vcs], self.file)
+  endif
+endfunction
+
+function! airline#async#vcs_clean(cmd, file, vcs)
+  if g:airline#init#vim_async
+    " Vim 8 with async support
+    noa call airline#async#vim_vcs_clean(a:cmd, a:file, a:vcs)
+  else
+    " nvim async or vim without job-feature
+    noa call airline#async#nvim_vcs_clean(a:cmd, a:file, a:vcs)
+  endif
+endfunction
+
 if v:version >= 800 && has("job")
   " Vim 8.0 with Job feature
   " TODO: Check if we need the cwd option for the job_start() functions
@@ -133,6 +157,29 @@ if v:version >= 800 && has("job")
     let s:po_jobs[a:file] = id
   endfunction
 
+  function! airline#async#vim_vcs_clean(cmd, file, vcs)
+    if g:airline#init#is_windows && &shell =~ 'cmd'
+      let cmd = a:cmd
+    else
+      let cmd = ['sh', '-c', a:cmd]
+    endif
+
+    let options = {'buf': '', 'vcs': a:vcs, 'file': a:file}
+    let jobs = get(s:clean_jobs, a:vcs, {})
+    if has_key(jobs, a:file)
+      if job_status(get(jobs, a:file)) == 'run'
+        return
+      elseif has_key(jobs, a:file)
+        call remove(jobs, a:file)
+      endif
+    endif
+    let id = job_start(cmd, {
+          \ 'err_io':   'null',
+          \ 'out_cb':   function('s:on_stdout', options),
+          \ 'close_cb': function('s:on_exit_clean', options)})
+    let jobs[a:file] = id
+  endfunction
+
   function! airline#async#vim_vcs_untracked(config, file)
     if g:airline#init#is_windows && &shell =~ 'cmd'
       let cmd = a:config['cmd'] . shellescape(a:file)
@@ -208,6 +255,32 @@ elseif has("nvim")
     let s:mq_jobs[a:file] = id
   endfunction
 
+  function! airline#async#nvim_vcs_clean(cmd, file, vcs)
+    let config = {
+    \ 'buf': '',
+    \ 'vcs': a:vcs,
+    \ 'file': a:file,
+    \ 'cwd': s:valid_dir(fnamemodify(a:file, ':p:h')),
+    \ 'on_stdout': function('s:nvim_output_handler'),
+    \ 'on_stderr': function('s:nvim_output_handler'),
+    \ 'on_exit': function('s:on_exit_clean')
+    \ }
+    if g:airline#init#is_windows && &shell =~ 'cmd'
+      let cmd = a:cmd
+    else
+      let cmd = ['sh', '-c', a:cmd]
+    endif
+
+    if !has_key(s:clean_jobs, a:vcs)
+      let s:clean_jobs[a:vcs] = {}
+    endif
+    if has_key(s:clean_jobs[a:vcs], a:file)
+      call remove(s:clean_jobs[a:vcs], a:file)
+    endif
+    let id = jobstart(cmd, config)
+    let s:clean_jobs[a:vcs][a:file] = id
+  endfunction
+
   function! airline#async#nvim_get_msgfmt_stat(cmd, file)
     let config = {
     \ 'buf': '',

autoload/airline/extensions/branch.vim

@@ -17,6 +17,7 @@ let s:vcs_config = {
 \  'git': {
 \    'exe': 'git',
 \    'cmd': 'git status --porcelain -- ',
+\    'dirty': 'git status --porcelain',
 \    'untracked_mark': '??',
 \    'exclude': '\.git',
 \    'update_branch': 's:update_git_branch',
@@ -27,6 +28,7 @@ let s:vcs_config = {
 \  'mercurial': {
 \    'exe': 'hg',
 \    'cmd': 'hg status -u -- ',
+\    'dirty': 'hg status -muard',
 \    'untracked_mark': '?',
 \    'exclude': '\.hg',
 \    'update_branch': 's:update_hg_branch',
@@ -51,6 +53,7 @@ function! s:init_buffer()
     let b:buffer_vcs_config[vcs] = {
           \     'branch': '',
           \     'untracked': '',
+          \     'dirty': 0,
           \   }
   endfor
   unlet! b:airline_head
@@ -200,6 +203,8 @@ function! s:update_untracked()
     " result of the previous call, i.e. the head string is not updated. It
     " doesn't happen often in practice, so we let it be.
     call airline#async#vcs_untracked(config, file, vcs)
+    " Check clean state of repo
+    call airline#async#vcs_clean(config.dirty, file, vcs)
   endfor
 endfunction
 
@@ -233,7 +238,11 @@ function! airline#extensions#branch#head()
       let b:airline_head .= s:vcs_config[vcs].exe .':'
     endif
     let b:airline_head .= s:format_name({s:vcs_config[vcs].display_branch}())
-    let b:airline_head .= b:buffer_vcs_config[vcs].untracked
+    let additional = b:buffer_vcs_config[vcs].untracked
+    if empty(additional) && b:buffer_vcs_config[vcs].dirty
+      let additional = g:airline_symbols['dirty']
+    endif
+    let b:airline_head .= additional
   endfor
 
   if empty(heads)
@@ -269,10 +278,10 @@ function! airline#extensions#branch#get_head()
   let winwidth = get(airline#parts#get('branch'), 'minwidth', 120)
   let minwidth = empty(get(b:, 'airline_hunks', '')) ? 14 : 7
   let head = airline#util#shorten(head, winwidth, minwidth)
-  let empty_message = get(g:, 'airline#extensions#branch#empty_message', '')
   let symbol = get(g:, 'airline#extensions#branch#symbol', g:airline_symbols.branch)
+  let dirty  = get(b:, 'airline_branch_dirty', '')
   return empty(head)
-        \ ? empty_message
+        \ ? get(g:, 'airline#extensions#branch#empty_message', '')
         \ : printf('%s%s', empty(symbol) ? '' : symbol.(g:airline_symbols.space), head)
 endfunction
 

autoload/airline/init.vim

@@ -86,7 +86,7 @@ function! airline#init#bootstrap()
     call s:check_defined('g:airline_left_alt_sep', "\ue0b1")  " 
     call s:check_defined('g:airline_right_sep', "\ue0b2")     " 
     call s:check_defined('g:airline_right_alt_sep', "\ue0b3") " 
-    " ro=, ws=☲, lnr=☰, mlnr=, br=, nx=Ɇ, crypt=🔒
+    " ro=, ws=☲, lnr=☰, mlnr=, br=, nx=Ɇ, crypt=🔒, dirty=⚡
     call extend(g:airline_symbols, {
           \ 'readonly': "\ue0a2",
           \ 'whitespace': "\u2632",
@@ -94,6 +94,7 @@ function! airline#init#bootstrap()
           \ 'maxlinenr': " \ue0a1",
           \ 'branch': "\ue0a0",
           \ 'notexists': "\u0246",
+          \ 'dirty': "\u26a1",
           \ 'crypt': nr2char(0x1F512),
           \ }, 'keep')
   elseif &encoding==?'utf-8' && !get(g:, "airline_symbols_ascii", 0)
@@ -111,6 +112,7 @@ function! airline#init#bootstrap()
           \ 'branch': "\u16A0",
           \ 'notexists': "\u0246",
           \ 'crypt': nr2char(0x1F512),
+          \ 'dirty': '!',
           \ }, 'keep')
   else
     " Symbols for ASCII terminals