derivations/dev: improve go shell

- use vim and neovim
- combine common vim configuration

derivations/dev/go.nix

@@ -7,6 +7,53 @@
 }:
 let
   go = builtins.getAttr "go_${version}" pkgs;
+  commonVimRC = ''
+    let g:tagbar_type_go = {
+      \ 'ctagstype' : 'go',
+      \ 'kinds'     : [
+          \ 'p:package',
+          \ 'i:imports:1',
+          \ 'c:constants',
+          \ 'v:variables',
+          \ 't:types',
+          \ 'n:interfaces',
+          \ 'w:fields',
+          \ 'e:embedded',
+          \ 'm:methods',
+          \ 'r:constructor',
+          \ 'f:functions'
+      \ ],
+      \ 'sro' : '.',
+      \ 'kind2scope' : {
+          \ 't' : 'ctype',
+          \ 'n' : 'ntype'
+      \ },
+      \ 'scope2kind' : {
+          \ 'ctype' : 't',
+          \ 'ntype' : 'n'
+      \ },
+      \ 'ctagsbin'  : 'gotags',
+      \ 'ctagsargs' : '-sort -silent'
+      \ }
+
+    " vim-go {
+    let g:go_highlight_functions = 1
+    let g:go_highlight_methods = 1
+    let g:go_highlight_structs = 1
+    let g:go_highlight_interfaces = 1
+    let g:go_highlight_operators = 1
+    let g:go_highlight_build_constraints = 1
+    let g:go_fmt_command = 'gofmt'
+    let g:go_fmt_options= '-s'
+    let g:go_def_mode = 'godef'
+    let g:go_def_reuse_buffer = 0
+
+    au FileType go nmap <Leader>gds <Plug>(go-def-split)
+    au FileType go nmap <Leader>gdv <Plug>(go-def-vertical)
+    au FileType go nmap <Leader>gdt <Plug>(go-def-tab)
+    au FileType go nmap <Leader>gi <Plug>(go-imports)
+    " }
+  '';
   buildInputs = with pkgs; [
       glibc.out
       glibc.static
@@ -21,8 +68,8 @@ let
       gox.bin
       #ginkgo ginkgo.bin
       #gomega
-      (import ./vim-go.nix{inherit pkgs;})
-      (import ./neovim-go.nix{inherit pkgs;})
+      ( import ./vim-go.nix { pkgs=gitpkgs; commonRC=commonVimRC; } )
+      ( import ./neovim-go.nix { pkgs=gitpkgs; commonRC=commonVimRC; } )
   ];
 
 in pkgs.stdenv.mkDerivation {