add g:go_metalinter_config_enabled and g:go_metalinter_grep_new flags

Author: micahcoffman

autoload/go/config.vim

@@ -244,6 +244,14 @@ function! go#config#Metalinter() abort
   return get(g:, "go_metalinter", "gometalinter")
 endfunction
 
+function! go#config#MetalinterConfigEnabled() abort
+  return get(g:, "go_metalinter_config_enabled", 0)
+endfunction
+
+function! go#config#MetalinterGrepNew() abort
+  return get(g:, "go_metalinter_grep_new", 0)
+endfunction
+
 function! go#config#MetalinterCommand() abort
   return get(g:, "go_metalinter_command", "")
 endfunction

autoload/go/lint.vim

@@ -255,7 +255,14 @@ function! s:golangcilintcmd(bin_path)
   let cmd = [a:bin_path]
   let cmd += ["run"]
   let cmd += ["--print-issued-lines=false"]
-  let cmd += ["--disable-all"]
+
+  if go#config#MetalinterConfigEnabled() == 0
+    let cmd += ["--no-config"]
+    let cmd += ["--disable-all"]
+    if go#config#MetalinterGrepNew() == 1
+      let cmd += ["--new-from-rev=HEAD~"]
+  endif
+
   return cmd
 endfunction