Provide a descriptive quickfix/location list title.

Currently, the w:quickfix_title is being automatically set to the actual
Vim command that populates quickfix/location list. For example, running
any Guru command it will be displayed as ':    lgetexpr a:items' which
is not really informative.

autoload/go/cmd.vim

@@ -129,7 +129,7 @@ function! go#cmd#Run(bang, ...)
   let items = go#list#Get(l:listtype)
   let errors = go#tool#FilterValids(items)
 
-  call go#list#Populate(l:listtype, errors)
+  call go#list#Populate(l:listtype, errors, &makeprg)
   call go#list#Window(l:listtype, len(errors))
   if !empty(errors) && !a:bang
     call go#list#JumpToFirst(l:listtype)
@@ -251,7 +251,7 @@ function! go#cmd#Test(bang, compile, ...)
     let errors = go#tool#ParseErrors(split(out, '\n'))
     let errors = go#tool#FilterValids(errors)
 
-    call go#list#Populate(l:listtype, errors)
+    call go#list#Populate(l:listtype, errors, command)
     call go#list#Window(l:listtype, len(errors))
     if !empty(errors) && !a:bang
       call go#list#JumpToFirst(l:listtype)

autoload/go/fmt.vim

@@ -185,7 +185,7 @@ function! go#fmt#Format(withGoimport)
       % | " Couldn't detect gofmt error format, output errors
     endif
     if !empty(errors)
-      call go#list#Populate(l:listtype, errors)
+      call go#list#Populate(l:listtype, errors, 'Format')
       echohl Error | echomsg "Gofmt returned error" | echohl None
     endif
 

autoload/go/guru.vim

@@ -115,7 +115,7 @@ endfunc
 " and put it into location list. I believe using errorformat is much more
 " easier to use. If we need more power we can always switch back to parse it
 " via regex.
-func! s:loclistSecond(output)
+func! s:loclistSecond(output, title)
   " backup users errorformat, will be restored once we are finished
   let old_errorformat = &errorformat
 
@@ -128,7 +128,7 @@ func! s:loclistSecond(output)
   " useful and location only has the ability to show one line and column
   " number
   let errformat = "%f:%l.%c-%[%^:]%#:\ %m,%f:%l:%c:\ %m"
-  call go#list#ParseFormat("locationlist", errformat, split(a:output, "\n"))
+  call go#list#ParseFormat("locationlist", errformat, split(a:output, "\n"), a:title)
 
   let errors = go#list#Get("locationlist")
   call go#list#Window("locationlist", len(errors))
@@ -189,7 +189,7 @@ function! go#guru#Whicherrs(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Whicherrs')
 endfunction
 
 " Show 'implements' relation for selected package
@@ -200,7 +200,7 @@ function! go#guru#Implements(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Implements')
 endfunction
 
 " Describe selected syntax: definition, methods, etc
@@ -211,7 +211,7 @@ function! go#guru#Describe(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Describe')
 endfunction
 
 " Show possible targets of selected function call
@@ -222,7 +222,7 @@ function! go#guru#Callees(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Callees')
 endfunction
 
 " Show possible callers of selected function
@@ -233,7 +233,7 @@ function! go#guru#Callers(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Callers')
 endfunction
 
 " Show path from callgraph root to selected function
@@ -244,7 +244,7 @@ function! go#guru#Callstack(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Callback')
 endfunction
 
 " Show free variables of selection
@@ -261,7 +261,7 @@ function! go#guru#Freevars(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Freevars')
 endfunction
 
 " Show send/receive corresponding to selected channel op
@@ -272,7 +272,7 @@ function! go#guru#ChannelPeers(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'ChannelPeers')
 endfunction
 
 " Show all refs to entity denoted by selected identifier
@@ -283,7 +283,7 @@ function! go#guru#Referrers(selected)
     return
   endif
 
-  call s:loclistSecond(out.out)
+  call s:loclistSecond(out.out, 'Referrers')
 endfunction
 
 function! go#guru#What(selected)

autoload/go/jobcontrol.vim

@@ -150,7 +150,7 @@ function! s:on_exit(job_id, exit_status)
   " if we are still in the same windows show the list
   if self.winnr == winnr()
     let l:listtype = "locationlist"
-    call go#list#Populate(l:listtype, errors)
+    call go#list#Populate(l:listtype, errors, self.desc)
     call go#list#Window(l:listtype, len(errors))
     if !empty(errors) && !self.bang
       call go#list#JumpToFirst(l:listtype)

autoload/go/lint.vim

@@ -77,7 +77,7 @@ function! go#lint#Gometa(autosave, ...) abort
     let errformat = "%f:%l:%c:%t%*[^:]:\ %m,%f:%l::%t%*[^:]:\ %m"
 
     " Parse and populate our location list
-    call go#list#ParseFormat(l:listtype, errformat, split(out, "\n"))
+    call go#list#ParseFormat(l:listtype, errformat, split(out, "\n"), 'GoMetaLinter')
 
     let errors = go#list#Get(l:listtype)
     call go#list#Window(l:listtype, len(errors))
@@ -129,7 +129,7 @@ function! go#lint#Vet(bang, ...)
   let l:listtype = "quickfix"
   if go#util#ShellError() != 0
     let errors = go#tool#ParseErrors(split(out, '\n'))
-    call go#list#Populate(l:listtype, errors)
+    call go#list#Populate(l:listtype, errors, 'Vet')
     call go#list#Window(l:listtype, len(errors))
     if !empty(errors) && !a:bang
       call go#list#JumpToFirst(l:listtype)
@@ -171,7 +171,7 @@ function! go#lint#Errcheck(...) abort
     let errformat = "%f:%l:%c:\ %m, %f:%l:%c\ %#%m"
 
     " Parse and populate our location list
-    call go#list#ParseFormat(l:listtype, errformat, split(out, "\n"))
+    call go#list#ParseFormat(l:listtype, errformat, split(out, "\n"), 'Errcheck')
 
     let errors = go#list#Get(l:listtype)
 
@@ -182,7 +182,7 @@ function! go#lint#Errcheck(...) abort
     endif
 
     if !empty(errors)
-      call go#list#Populate(l:listtype, errors)
+      call go#list#Populate(l:listtype, errors, 'Errcheck')
       call go#list#Window(l:listtype, len(errors))
       if !empty(errors)
         call go#list#JumpToFirst(l:listtype)

autoload/go/list.vim

@@ -50,12 +50,14 @@ function! go#list#Get(listtype)
 endfunction
 
 " Populate populate the location list with the given items
-function! go#list#Populate(listtype, items)
+function! go#list#Populate(listtype, items, title)
   let l:listtype = go#list#Type(a:listtype)
   if l:listtype == "locationlist"
     call setloclist(0, a:items, 'r')
+    call setloclist(0, [], 'a', {'title': a:title})
   else
     call setqflist(a:items, 'r')
+    call setqflist([], 'a', {'title': a:title})
   endif
 endfunction
 
@@ -65,7 +67,7 @@ endfunction
 
 " Parse parses the given items based on the specified errorformat nad
 " populates the location list.
-function! go#list#ParseFormat(listtype, errformat, items)
+function! go#list#ParseFormat(listtype, errformat, items, title)
   let l:listtype = go#list#Type(a:listtype)
   " backup users errorformat, will be restored once we are finished
   let old_errorformat = &errorformat
@@ -74,8 +76,10 @@ function! go#list#ParseFormat(listtype, errformat, items)
   let &errorformat = a:errformat
   if l:listtype == "locationlist"
     lgetexpr a:items
+    call setloclist(0, [], 'a', {'title': a:title})
   else
     cgetexpr a:items
+    call setqflist([], 'a', {'title': a:title})
   endif
 
   "restore back

autoload/go/rename.vim

@@ -52,7 +52,7 @@ function! go#rename#Rename(bang, ...)
   let l:listtype = "quickfix"
   if go#util#ShellError() != 0
     let errors = go#tool#ParseErrors(split(out, '\n'))
-    call go#list#Populate(l:listtype, errors)
+    call go#list#Populate(l:listtype, errors, 'Rename')
     call go#list#Window(l:listtype, len(errors))
     if !empty(errors) && !a:bang
       call go#list#JumpToFirst(l:listtype)

autoload/go/term.vim

@@ -53,6 +53,7 @@ function! go#term#newmode(bang, cmd, mode)
   let $GOPATH = old_gopath
 
   let job.id = id
+  let job.cmd = a:cmd
   startinsert
 
   " resize new term if needed.
@@ -115,7 +116,7 @@ function! s:on_exit(job_id, exit_status)
     " close terminal we don't need it anymore
     close 
 
-    call go#list#Populate(l:listtype, errors)
+    call go#list#Populate(l:listtype, errors, job.cmd)
     call go#list#Window(l:listtype, len(errors))
     if !self.bang
       call go#list#JumpToFirst(l:listtype)