Merge pull request #2613 from hdonnay/master

fmt: respect buffer-level go_fmt_options

autoload/go/config.vim

@@ -351,7 +351,7 @@ function! go#config#FmtCommand() abort
 endfunction
 
 function! go#config#FmtOptions() abort
-  return get(g:, "go_fmt_options", {})
+  return get(b:, "go_fmt_options", get(g:, "go_fmt_options", {}))
 endfunction
 
 function! go#config#FmtFailSilently() abort

doc/vim-go.txt

@@ -1339,6 +1339,19 @@ The dictionary version allows you to define options for multiple binaries:
     \ 'gofmt': '-s',
     \ 'goimports': '-local mycompany.com',
     \ }
+<
+                                                          *'b:go_fmt_options'*
+
+This option is identical to |'g:go_fmt_options'|, but a buffer-level setting.
+If present, it's used instead of the global setting. By default it is not set.
+
+As an example, the following autocmd will configure goimports to put imports
+of packages from the current module in their own group:
+>
+  autocmd FileType go let b:go_fmt_options = {
+    \ 'goimports': '-local ' .
+      \ trim(system('{cd '. shellescape(expand('%:h')) .' && go list -m;}')),
+    \ }
 <
                                                     *'g:go_fmt_fail_silently'*