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 a special marker and concealing to avoid false-positives when commit
subjects begin with parentheses.

autoload/fugitive.vim

@@ -1701,14 +1701,16 @@ 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%d%x09%s', a:refspec, '--'])[0]
   call map(lines, 'split(v:val, "\t", 1)')
-  call map(lines, '{"type": "Log", "commit": v:val[0], "subject": join(v:val[1 : -1], "\t")}')
+  call map(lines, '{"type": "Log", "commit": v:val[0], "refs": trim(v:val[1]), "subject": join(v:val[2 : -1], "\t")}')
   return lines
 endfunction
 
 function! s:FormatLog(dict) abort
-  return a:dict.commit . ' ' . a:dict.subject
+  setlocal conceallevel=3
+  setlocal concealcursor=nc
+  return a:dict.commit . ' ' . ((len(a:dict.refs) > 0) ? ("\x1f" . a:dict.refs . ' ') : '') . a:dict.subject
 endfunction
 
 function! s:FormatRebase(dict) abort

syntax/fugitive.vim

@@ -23,8 +23,10 @@ syn match fugitiveDone /^done\>/ contained containedin=@fugitiveSection nextgrou
 syn match fugitiveStop /^stop\>/ contained containedin=@fugitiveSection nextgroup=fugitiveHash skipwhite
 syn match fugitiveModifier /^[MADRCU?]\{1,2} / contained containedin=@fugitiveSection
 syn match fugitiveSymbolicRef /\.\@!\%(\.\.\@!\|[^[:space:][:cntrl:]\:.]\)\+\.\@<!/ contained
-syn match fugitiveHash /^\x\{4,\}\S\@!/ contained containedin=@fugitiveSection
+syn match fugitiveHash /^\x\{4,\}\S\@!/ contained containedin=@fugitiveSection nextgroup=fugitiveRefsConcealedMarker skipwhite
 syn match fugitiveHash /\S\@<!\x\{4,\}\S\@!/ contained
+syn match fugitiveRefsConcealedMarker "\%x1f" contained nextgroup=fugitiveRefs conceal
+syn match fugitiveRefs /([^)]\+)/hs=s+1,he=e-1 contained
 
 syn region fugitiveHunk start=/^\%(@@\+ -\)\@=/ end=/^\%([A-Za-z?@]\|$\)\@=/ contains=@fugitiveDiff containedin=@fugitiveSection fold
 
@@ -51,6 +53,7 @@ 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