Update

indent/haskell.vim

@@ -15,6 +15,10 @@ endif
 
 let b:did_indent = 1
 
+if !exists('g:haskell_indent_disable')
+    let g:haskell_indent_disable = 0
+endif
+
 if !exists('g:haskell_indent_if')
   " if x
   " >>>then ...
@@ -59,8 +63,14 @@ if !exists('g:haskell_indent_guard')
   let g:haskell_indent_guard = 2
 endif
 
-setlocal indentexpr=GetHaskellIndent()
-setlocal indentkeys=0{,0},0(,0),0[,0],!^F,o,O,0\=,0=where,0=let,0=deriving,<space>
+if exists("g:haskell_indent_disable") && g:haskell_indent_disable == 0
+    setlocal indentexpr=GetHaskellIndent()
+    setlocal indentkeys=0{,0},0(,0),0[,0],!^F,o,O,0\=,0=where,0=let,0=deriving,<space>
+else
+    setlocal nocindent
+    setlocal nosmartindent
+    setlocal autoindent
+endif
 
 function! s:isInBlock(hlstack)
   return index(a:hlstack, 'haskellParens') > -1 || index(a:hlstack, 'haskellBrackets') > -1 || index(a:hlstack, 'haskellBlock') > -1 || index(a:hlstack, 'haskellBlockComment') > -1 || index(a:hlstack, 'haskellPragma') > -1
@@ -270,7 +280,11 @@ function! GetHaskellIndent()
   " case foo of
   " >>bar -> quux
   if l:prevline =~ '\C\<case\>.\+\<of\>\s*$'
-    return match(l:prevline, '\C\<case\>') + g:haskell_indent_case
+    if exists('g:haskell_indent_case_alternative') && g:haskell_indent_case_alternative
+      return match(l:prevline, '\S') + &shiftwidth
+    else
+      return match(l:prevline, '\C\<case\>') + g:haskell_indent_case
+    endif
   endif
 
   "" where foo
@@ -324,8 +338,8 @@ function! GetHaskellIndent()
 
       while v:lnum != l:c
         " fun decl
-        let l:s = match(l:l, l:m)
-        if l:s >= 0
+        if l:l =~ ('^\s*' . l:m . '\(\s*::\|\n\s\+::\)')
+          let l:s = match(l:l, l:m)
           if match(l:l, '\C^\s*\<default\>') > -1
             return l:s - 8
           else