Do not indent Golang comments as code

When indenting on newline in Go files, only remove trailing whitespace
on the previous line and copy indentation of the previous line if in
comment context.

Added regression tests.

rc/filetype/go.kak

@@ -102,16 +102,24 @@ define-command -hidden go-indent-on-new-line %~
     evaluate-commands -draft -itersel %=
         # preserve previous line indent
         try %{ execute-keys -draft <semicolon>K<a-&> }
-        # indent after lines ending with { or (
-        try %[ execute-keys -draft k<a-x> <a-k> [{(]\h*$ <ret> j<a-gt> ]
         # cleanup trailing white spaces on the previous line
         try %{ execute-keys -draft k<a-x> s \h+$ <ret>d }
+        try %{
+            try %{ # line comment
+                execute-keys -draft k<a-x> s ^\h*// <ret>
+            } catch %{ # block comment
+                execute-keys -draft <a-?> /\* <ret> <a-K>\*/<ret>
+            }
+        } catch %{
+            # indent after lines ending with { or (
+            try %[ execute-keys -draft k<a-x> <a-k> [{(]\h*$ <ret> j<a-gt> ]
             # align to opening paren of previous line
             try %{ execute-keys -draft [( <a-k> \A\([^\n]+\n[^\n]*\n?\z <ret> s \A\(\h*.|.\z <ret> '<a-;>' & }
             # indent after a switch's case/default statements
             try %[ execute-keys -draft k<a-x> <a-k> ^\h*(case|default).*:$ <ret> j<a-gt> ]
             # deindent closing brace(s) when after cursor
             try %[ execute-keys -draft <a-x> <a-k> ^\h*[})] <ret> gh / [})] <ret> m <a-S> 1<a-&> ]
+        }
     =
 ~
 

test/indent/go/insert-comment/cmd

@@ -0,0 +1 @@
+c<ret>

test/indent/go/insert-comment/in

@@ -0,0 +1,11 @@
+1
+// foo(bar,%( )
+
+2
+	// foo(bar,%( )
+
+3
+// foo{%( )
+
+4
+	// foo{%( )

test/indent/go/insert-comment/out

@@ -0,0 +1,15 @@
+1
+// foo(bar,
+// 
+
+2
+	// foo(bar,
+	// 
+
+3
+// foo{
+// 
+
+4
+	// foo{
+	// 

test/indent/go/insert-comment/rc

@@ -0,0 +1,4 @@
+source "%val{runtime}/colors/default.kak"
+source "%val{runtime}/rc/filetype/go.kak"
+set buffer filetype go
+set-option global disabled_hooks go-insert-closing-delimiter