FindFirstUnbalancedParen can cause incorrect indention if using noet

[suokko]

If noet is enabled and I try to use multiline function parameters indention counts characters without expanding tabs to shiftwidth. I made an quick local fix but I'm not exactly sure if that is completely correct.

diff --git a/after/indent/lua.vim b/after/indent/lua.vim
index 5f18744..4c32d8e 100755
--- a/after/indent/lua.vim
+++ b/after/indent/lua.vim
@@ -216,6 +216,18 @@ function! LuaGetPrevLines()
   return s:GetPrevLines()
 endfunction
 
+function s:GetIndentWidth(line, end_idx)
+  let result = 0
+  for pos in range(a:end_idx)
+    if a:line[pos] == "\t"
+      let result += &shiftwidth
+    else
+      let result += 1
+    endif
+  endfor
+  return result
+endfunction
+
 " Tries the best effort to the find the opening '(' which marks a multi line
 " expression. However, sometimes it well balanced, meaning there is not such
 " opening locally, or such an opening would give too much indent (immediate
@@ -255,7 +267,7 @@ function! s:FindFirstUnbalancedParen(lines)
           if match(line, '\v^.+\(.*<function>' ) > -1
             return s:GetStringIndent(line) + &shiftwidth
           else
-            return i + 1
+            return s:GetIndentWidth(line, i) + 1
           endif
         endif
       endif

[idbrii]

Here's a test case:

Previous indent:

f = function(a,
	     b)
	print(a)
	g = function(a,
	      b)
	end
end

This patch now indents to:

f = function(a,
	     b)
	print(a)
	g = function(a,
		     b)
	end
end

(noet sw=8 ts=8)