Merge pull request #888 from ohcibi/feature/add-pathshorten-as-long-branch-name-option

Add `pathshorten` as a built-in format for long branch names

autoload/airline/extensions/branch.vim

@@ -14,6 +14,10 @@ if s:head_format == 1
   function! s:format_name(name)
     return fnamemodify(a:name, ':t')
   endfunction
+elseif s:head_format == 2
+  function! s:format_name(name)
+    return pathshorten(a:name)
+  endfunction
 elseif type(s:head_format) == type('')
   function! s:format_name(name)
     return call(s:head_format, [a:name])

doc/airline.txt

@@ -320,9 +320,13 @@ vcscommand   <http://www.vim.org/scripts/script.php?script_id=90>
   " default value leaves the name unmodifed
   let g:airline#extensions#branch#format = 0
 
-  " to only show the tail, e.g. a branch 'feature/foo' show 'foo'
+  " 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'