Change haskell provider to neovimhaskell/haskell-vim, closes #75

indent/haskell.vim

@@ -0,0 +1,189 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'haskell') == -1
+  
+" indentation for haskell
+"
+" Based on idris indentation
+"
+" author: raichoo (raichoo@googlemail.com)
+"
+" Modify g:haskell_indent_if and g:haskell_indent_case to
+" change indentation for `if'(default 3) and `case'(default 5).
+" Example (in .vimrc):
+" > let g:haskell_indent_if = 2
+
+if exists('b:did_indent')
+  finish
+endif
+
+let b:did_indent = 1
+
+if !exists('g:haskell_indent_if')
+  " if bool
+  " >>>then ...
+  " >>>else ...
+  let g:haskell_indent_if = 3
+endif
+
+if !exists('g:haskell_indent_case')
+  " case xs of
+  " >>[]     -> ...
+  " >>(y:ys) -> ...
+  let g:haskell_indent_case = 2
+endif
+
+if !exists('g:haskell_indent_let')
+  " let x = 0 in
+  " >>>>x
+  let g:haskell_indent_let = 4
+endif
+
+if !exists('g:haskell_indent_where')
+  " where f :: Int -> Int
+  " >>>>>>f x = x
+  let g:haskell_indent_where = 6
+endif
+
+if !exists('g:haskell_indent_do')
+  " do x <- a
+  " >>>y <- b
+  let g:haskell_indent_do = 3
+endif
+
+if !exists('g:haskell_indent_in')
+  " let x = 1
+  " >in x
+  let g:haskell_indent_in = 1
+endif
+
+setlocal indentexpr=GetHaskellIndent()
+setlocal indentkeys=!^F,o,O,0\|,0=where,0=in,0=let,0=deriving,0=->,0=\=>,<CR>,0}
+
+function! GetHaskellIndent()
+  let l:prevline = getline(v:lnum - 1)
+
+  if l:prevline =~ '^\s*--'
+    return match(l:prevline, '\S')
+  endif
+
+  if synIDattr(synID(line("."), col("."), 1), "name") == 'haskellBlockComment'
+      for l:c in range(v:lnum - 1, 0, -1)
+          let l:bline = getline(l:c)
+          if l:bline =~ '{-'
+              return 1 + match(l:bline, '{-')
+      endfor
+      return 1
+  endif
+
+  if l:prevline =~ '^\s*$'
+      return 0
+  endif
+
+  let l:line = getline(v:lnum)
+
+  if l:line =~ '\C^\s*\<where\>'
+    let l:s = match(l:prevline, '\S')
+    return l:s + &shiftwidth
+  endif
+
+  if l:line =~ '\C^\s*\<deriving\>'
+    let l:s = match(l:prevline, '\C\<\(newtype\|data\)\>')
+    if l:s >= 0
+      return l:s + &shiftwidth
+    endif
+  endif
+
+  if l:line =~ '\C^\s*\<let\>'
+    let l:s = match(l:prevline, '\C\<let\>')
+    if l:s != 0
+      return l:s
+    endif
+  endif
+
+  if l:line =~ '\C^\s*\<in\>'
+    let l:s = match(l:prevline, '\C\<let\>')
+    if l:s >= 0
+      return l:s + g:haskell_indent_in
+    elseif match(l:prevline, '=') > 0
+      let l:s = match(l:prevline, '\S')
+      return l:s - (4 - g:haskell_indent_in)
+    endif
+  endif
+
+  if l:line =~ '^\s*|'
+    if match(l:prevline, '^\s*data') < 0
+      if match(l:prevline, '^\s*|\s') >= 0
+        return match(l:prevline, '|')
+      else
+        return &shiftwidth
+      endif
+    endif
+  endif
+
+  if l:line =~ '^\s*[=-]>'
+    let l:s = match(l:prevline, ' :: ')
+    if l:s >= 0
+      return l:s + 1
+    endif
+  endif
+
+  if l:prevline =~ '\s\+[!#$%&*+./<>?@\\^|~-]\+\s*$'
+    let l:s = match(l:prevline, '\S')
+    if l:s > 0
+      return l:s + &shiftwidth
+    endif
+  endif
+
+  if l:prevline =~ '[{([][^})\]]\+$'
+    return match(l:prevline, '[{([]')
+  endif
+
+  if l:prevline =~ '\C\<let\>\s\+[^=]\+=\s*$'
+    return match(l:prevline, '\C\<let\>') + g:haskell_indent_let + &shiftwidth
+  endif
+
+  if l:prevline =~ '\C\<let\>\s\+.\+\(\<in\>\)\?\s*$'
+    return match(l:prevline, '\C\<let\>') + g:haskell_indent_let
+  endif
+
+  if l:prevline !~ '\C\<else\>'
+    let l:s = match(l:prevline, '\C\<if\>.*\&.*\zs\<then\>')
+    if l:s > 0
+      return l:s
+    endif
+
+    let l:s = match(l:prevline, '\C\<if\>')
+    if l:s > 0
+      return l:s + g:haskell_indent_if
+    endif
+  endif
+
+  if l:prevline =~ '\C\(\<where\>\|\<do\>\|=\|[{([]\)\s*$'
+    return match(l:prevline, '\S') + &shiftwidth
+  endif
+
+  if l:prevline =~ '\C\<where\>\s\+\S\+.*$'
+    return match(l:prevline, '\C\<where\>') + g:haskell_indent_where
+  endif
+
+  if l:prevline =~ '\C\<do\>\s\+\S\+.*$'
+    return match(l:prevline, '\C\<do\>') + g:haskell_indent_do
+  endif
+
+  if l:prevline =~ '\C^\s*\<data\>\s\+[^=]\+\s\+=\s\+\S\+.*$'
+    if l:line =~ '^\s*|'
+      return match(l:prevline, '=')
+    endif
+  endif
+
+  if l:prevline =~ '\C\<case\>\s\+.\+\<of\>\s*$'
+    return match(l:prevline, '\C\<case\>') + g:haskell_indent_case
+  endif
+
+  if l:prevline =~ '\C^\s*\<\data\>\s\+\S\+\s*$'
+    return match(l:prevline, '\C\<data\>') + &shiftwidth
+  endif
+
+  return match(l:prevline, '\S')
+endfunction
+
+endif