Merge pull request #685 from fatih/show-type-info-complete

complete: show identifier information after completion is done

autoload/go/complete.vim

@@ -87,31 +87,32 @@ fu! s:gocodeCurrentBufferOpt(filename)
     return '-in=' . a:filename
 endf
 
-fu! s:gocodeCursor()
+fu! go#complete#gocodeCursor()
     if &encoding != 'utf-8'
         let sep = &l:fileformat == 'dos' ? "\r\n" : "\n"
         let c = col('.')
         let buf = line('.') == 1 ? "" : (join(getline(1, line('.')-1), sep) . sep)
         let buf .= c == 1 ? "" : getline('.')[:c-2]
         return printf('%d', len(iconv(buf, &encoding, "utf-8")))
     endif
+
     return printf('%d', line2byte(line('.')) + (col('.')-2))
 endf
 
 fu! s:gocodeAutocomplete()
     let filename = s:gocodeCurrentBuffer()
     let result = s:gocodeCommand('autocomplete',
                 \ [s:gocodeCurrentBufferOpt(filename), '-f=vim'],
-                \ [expand('%:p'), s:gocodeCursor()])
+                \ [expand('%:p'), go#complete#gocodeCursor()])
     call delete(filename)
     return result
 endf
 
-function! go#complete#GetInfo()
+function! go#complete#GetInfoFromOffset(offset)
     let filename = s:gocodeCurrentBuffer()
     let result = s:gocodeCommand('autocomplete',
                 \ [s:gocodeCurrentBufferOpt(filename), '-f=godit'],
-                \ [expand('%:p'), s:gocodeCursor()])
+                \ [expand('%:p'), a:offset])
     call delete(filename)
 
     " first line is: Charcount,,NumberOfCandidates, i.e: 8,,1
@@ -147,6 +148,11 @@ function! go#complete#GetInfo()
     return ""
 endfunction
 
+function! go#complete#GetInfo()
+    let offset = go#complete#gocodeCursor()
+    return go#complete#GetInfoFromOffset(offset)
+endfunction
+
 function! go#complete#Info()
     let result = go#complete#GetInfo()
     if !empty(result)

plugin/go.vim

@@ -120,6 +120,19 @@ endfunction
 
 " Autocommands
 " ============================================================================
+"
+function! s:echo_go_info()
+    if !exists('v:completed_item') || empty(v:completed_item)
+        return
+    endif
+    let item = v:completed_item
+
+    if !has_key(item, "info")
+        return
+    endif
+
+    redraws! | echo "vim-go: " | echohl Function | echon item.info | echohl None
+endfunction
 
 augroup vim-go
     autocmd!
@@ -129,6 +142,12 @@ augroup vim-go
         autocmd CursorHold *.go nested call go#complete#Info()
     endif
 
+    " Echo the identifier information when completion is done. Useful to see
+    " the signature of a function, etc...
+    if exists('##CompleteDone')
+        autocmd CompleteDone *.go nested call s:echo_go_info()
+    endif
+
     " Go code formatting on save
     if get(g:, "go_fmt_autosave", 1)
         autocmd BufWritePre *.go call go#fmt#Format(-1)