Show refs in log in Gstatus

Display refs (the output of %D from git log's format=pretty) next
to commit summaries in Gstatus.

Use basic syntax highlighting for all refs. Use digraphs to reduce the
possibility of false positives when syntax highlighting.

autoload/fugitive.vim

@@ -1701,14 +1701,14 @@ function! s:ReplaceCmd(cmd) abort
 endfunction
 
 function! s:QueryLog(refspec) abort
-  let lines = s:LinesError(['log', '-n', '256', '--pretty=format:%h%x09%s', a:refspec, '--'])[0]
+  let lines = s:LinesError(['log', '-n', '256', '--pretty=format:%h%x09%s%x09%D', a:refspec, '--'])[0]
   call map(lines, 'split(v:val, "\t")')
-  call map(lines, '{"type": "Log", "commit": v:val[0], "subject": v:val[-1]}')
+  call map(lines, '{"type": "Log", "commit": v:val[0], "subject": v:val[1], "ref": get(v:val, 2, "")}')
   return lines
 endfunction
 
 function! s:FormatLog(dict) abort
-  return a:dict.commit . ' ' . a:dict.subject
+  return a:dict.commit . ' ' . a:dict.subject .. ((len(a:dict.ref) > 0) ? (' «' . a:dict.ref . '»') : '')
 endfunction
 
 function! s:FormatRebase(dict) abort

syntax/fugitive.vim

@@ -25,6 +25,7 @@ syn match fugitiveModifier /^[MADRCU?]\{1,2} / contained containedin=@fugitiveSe
 syn match fugitiveSymbolicRef /\.\@!\%(\.\.\@!\|[^[:space:][:cntrl:]\:.]\)\+\.\@<!/ contained
 syn match fugitiveHash /^\x\{4,\}\S\@!/ contained containedin=@fugitiveSection
 syn match fugitiveHash /\S\@<!\x\{4,\}\S\@!/ contained
+syn match fugitiveRefs /«[^»]\+»/hs=s+1,he=e-1 contained containedin=@fugitiveSection
 
 syn region fugitiveHunk start=/^\%(@@\+ -\)\@=/ end=/^\%([A-Za-z?@]\|$\)\@=/ contains=@fugitiveDiff containedin=@fugitiveSection fold
 
@@ -51,6 +52,7 @@ hi def link fugitiveStagedModifier Typedef
 hi def link fugitiveInstruction Type
 hi def link fugitiveStop Function
 hi def link fugitiveHash Identifier
+hi def link fugitiveRefs Function
 hi def link fugitiveSymbolicRef Function
 hi def link fugitiveCount Number