Update

2 files changed, 302 insertions, 198 deletions

diff --git a/autoload/elixir/indent.vim b/autoload/elixir/indent.vim
index b6df3b5d..fd2f4a3f 100644
--- a/autoload/elixir/indent.vim
+++ b/autoload/elixir/indent.vim
@@ -1,219 +1,347 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elixir') == -1
   
-let s:NO_COLON_BEFORE = ':\@<!'
-let s:NO_COLON_AFTER = ':\@!'
-let s:ENDING_SYMBOLS = '\]\|}\|)'
-let s:ARROW = '->'
-let s:END_WITH_ARROW = s:ARROW.'$'
-let s:SKIP_SYNTAX = '\%(Comment\|String\)$'
-let s:BLOCK_SKIP = "synIDattr(synID(line('.'),col('.'),1),'name') =~? '".s:SKIP_SYNTAX."'"
-let s:DEF = '^\s*def'
-let s:FN = '\<fn\>'
-let s:MULTILINE_FN = s:FN.'\%(.*end\)\@!'
-let s:BLOCK_START = '\%(\<do\>\|'.s:FN.'\)\>'
-let s:MULTILINE_BLOCK = '\%(\<do\>'.s:NO_COLON_AFTER.'\|'.s:MULTILINE_FN.'\)'
-let s:BLOCK_MIDDLE = '\<\%(else\|match\|elsif\|catch\|after\|rescue\)\>'
-let s:BLOCK_END = 'end'
-let s:STARTS_WITH_PIPELINE = '^\s*|>.*$'
-let s:QUERY_FROM = '^\s*\<from\>.*\<in\>.*,'
-let s:ENDING_WITH_ASSIGNMENT = '=\s*$'
-let s:INDENT_KEYWORDS = s:NO_COLON_BEFORE.'\%('.s:MULTILINE_BLOCK.'\|'.s:BLOCK_MIDDLE.'\)'
-let s:DEINDENT_KEYWORDS = '^\s*\<\%('.s:BLOCK_END.'\|'.s:BLOCK_MIDDLE.'\)\>'
-let s:PAIR_START = '\<\%('.s:NO_COLON_BEFORE.s:BLOCK_START.'\)\>'.s:NO_COLON_AFTER
-let s:PAIR_MIDDLE = '^\s*\%('.s:BLOCK_MIDDLE.'\)\>'.s:NO_COLON_AFTER.'\zs'
-let s:PAIR_END = '\<\%('.s:NO_COLON_BEFORE.s:BLOCK_END.'\)\>\zs'
-let s:LINE_COMMENT = '^\s*#'
-let s:MATCH_OPERATOR = '[^!><=]=[^~=>]'
-
-function! s:pending_parenthesis(line)
-  if a:line.last_non_blank.text !~ s:ARROW
-    return elixir#util#count_indentable_symbol_diff(a:line.last_non_blank, '(', '\%(end\s*\)\@<!)')
-  end
+function! elixir#indent#debug(str)
+  if exists("g:elixir_indent_debug") && g:elixir_indent_debug
+    echom a:str
+  endif
 endfunction
 
-function! s:pending_square_brackets(line)
-  if a:line.last_non_blank.text !~ s:ARROW
-    return elixir#util#count_indentable_symbol_diff(a:line.last_non_blank, '[', ']')
+" Returns 0 or 1 based on whether or not the text starts with the given
+" expression and is not a string or comment
+function! elixir#indent#starts_with(text, expr, lnum)
+  let pos = match(a:text, '^\s*'.a:expr)
+  if pos == -1
+    return 0
+  else
+    " NOTE: @jbodah 2017-02-24: pos is the index of the match which is
+    " zero-indexed. Add one to make it the column number
+    if elixir#indent#is_string_or_comment(a:lnum, pos + 1)
+      return 0
+    else
+      return 1
+    end
   end
 endfunction
 
-function! s:pending_brackets(line)
-  if a:line.last_non_blank.text !~ s:ARROW
-    return elixir#util#count_indentable_symbol_diff(a:line.last_non_blank, '{', '}')
+" Returns 0 or 1 based on whether or not the text ends with the given
+" expression and is not a string or comment
+function! elixir#indent#ends_with(text, expr, lnum)
+  let pos = match(a:text, a:expr.'\s*$')
+  if pos == -1
+    return 0
+  else
+    if elixir#indent#is_string_or_comment(a:lnum, pos)
+      return 0
+    else
+      return 1
+    end
   end
 endfunction
 
-function! elixir#indent#deindent_case_arrow(ind, line)
-  if get(b:old_ind, 'arrow', 0) > 0
-        \ && (a:line.current.text =~ s:ARROW
-        \ || a:line.current.text =~ s:BLOCK_END)
-    let ind = b:old_ind.arrow
-    let b:old_ind.arrow = 0
-    return ind
-  else
-    return a:ind
-  end
+" Returns 0 or 1 based on whether or not the text matches the given expression
+function! elixir#indent#contains(text, expr)
+  return a:text =~ a:expr
 endfunction
 
-function! elixir#indent#deindent_ending_symbols(ind, line)
-  if a:line.current.text =~ '^\s*\('.s:ENDING_SYMBOLS.'\)'
-    return a:ind - &sw
-  else
-    return a:ind
-  end
+" Returns 0 or 1 based on whether or not the given line number and column
+" number pair is a string or comment
+function! elixir#indent#is_string_or_comment(line, col)
+  return synIDattr(synID(a:line, a:col, 1), "name") =~ '\%(String\|Comment\)'
 endfunction
 
-function! elixir#indent#deindent_keywords(ind, line)
-  if a:line.current.text =~ s:DEINDENT_KEYWORDS
-    let bslnum = searchpair(
-          \ s:PAIR_START,
-          \ s:PAIR_MIDDLE,
-          \ s:PAIR_END,
-          \ 'nbW',
-          \ s:BLOCK_SKIP
-          \ )
+" Skip expression for searchpair. Returns 0 or 1 based on whether the value
+" under the cursor is a string or comment
+function! elixir#indent#searchpair_back_skip()
+  " NOTE: @jbodah 2017-02-27: for some reason this function gets called with
+  " and index that doesn't exist in the line sometimes. Detect and account for
+  " that situation
+  let curr_col = col('.')
+  if getline('.')[curr_col-1] == ''
+    let curr_col = curr_col-1
+  endif
+  return elixir#indent#is_string_or_comment(line('.'), curr_col)
+endfunction
 
-    return indent(bslnum)
+" DRY up searchpair calls
+function! elixir#indent#searchpair_back(start, mid, end)
+  let line = line('.')
+  return searchpair(a:start, a:mid, a:end, 'bnW', "line('.') == " . line . " || elixir#indent#searchpair_back_skip()")
+endfunction
+
+" DRY up searchpairpos calls
+function! elixir#indent#searchpairpos_back(start, mid, end)
+  let line = line('.')
+  return searchpairpos(a:start, a:mid, a:end, 'bnW', "line('.') == " . line . " || elixir#indent#searchpair_back_skip()")
+endfunction
+
+" DRY up regex for keywords that 1) makes sure we only look at complete words
+" and 2) ignores atoms
+function! elixir#indent#keyword(expr)
+  return ':\@<!\<\C\%('.a:expr.'\)\>:\@!'
+endfunction
+
+function! elixir#indent#starts_with_comment(text)
+  return match(a:text, '^\s*#') != -1
+endfunction
+
+" Start at the end of text and search backwards looking for a match. Also peek
+" ahead if we get a match to make sure we get a complete match. This means
+" that the result should be the position of the start of the right-most match
+function! elixir#indent#find_last_pos(lnum, text, match)
+  let last = len(a:text) - 1
+  let c = last
+
+  while c >= 0
+    let substr = strpart(a:text, c, last)
+    let peek = strpart(a:text, c - 1, last)
+    let ss_match = match(substr, a:match)
+    if ss_match != -1
+      let peek_match = match(peek, a:match)
+      if peek_match == ss_match + 1
+        let syng = synIDattr(synID(a:lnum, c + ss_match, 1), 'name')
+        if syng !~ '\%(String\|Comment\)'
+          return c + ss_match
+        end
+      end
+    end
+    let c -= 1
+  endwhile
+
+  return -1
+endfunction
+
+function! elixir#indent#handle_top_of_file(_lnum, _text, prev_nb_lnum, _prev_nb_text)
+  if a:prev_nb_lnum == 0
+    return 0
   else
-    return a:ind
+    return -1
   end
 endfunction
 
-function! elixir#indent#deindent_opened_symbols(ind, line)
-  let s:opened_symbol =
-        \   s:pending_parenthesis(a:line)
-        \ + s:pending_square_brackets(a:line)
-        \ + s:pending_brackets(a:line)
+" TODO: @jbodah 2017-03-31: remove
+function! elixir#indent#handle_following_trailing_do(lnum, text, prev_nb_lnum, prev_nb_text)
+  if elixir#indent#ends_with(a:prev_nb_text, elixir#indent#keyword('do'), a:prev_nb_lnum)
+    if elixir#indent#starts_with(a:text, elixir#indent#keyword('end'), a:lnum)
+      return indent(a:prev_nb_lnum)
+    else
+      return indent(a:prev_nb_lnum) + &sw
+    end
+  else
+    return -1
+  endif
+endfunction
 
-  if s:opened_symbol < 0
-    let ind = get(b:old_ind, 'symbol', a:ind + (s:opened_symbol * &sw))
-    let ind = float2nr(ceil(floor(ind)/&sw)*&sw)
-    return ind <= 0 ? 0 : ind
+function! elixir#indent#handle_following_trailing_binary_operator(lnum, text, prev_nb_lnum, prev_nb_text)
+  let binary_operator = '\%(=\|<>\|>>>\|<=\|||\|+\|\~\~\~\|-\|&&\|<<<\|/\|\^\^\^\|\*\)'
+
+  if elixir#indent#ends_with(a:prev_nb_text, binary_operator, a:prev_nb_lnum)
+    return indent(a:prev_nb_lnum) + &sw
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_after_pipeline(ind, line)
-  if exists("b:old_ind.pipeline")
-        \ && elixir#util#is_blank(a:line.last.text)
-        \ && a:line.current.text !~ s:STARTS_WITH_PIPELINE
-    " Reset indentation in pipelines if there is a blank line between
-    " pipes
-    let ind = b:old_ind.pipeline
-    unlet b:old_ind.pipeline
-    return ind
-  elseif a:line.last_non_blank.text =~ s:STARTS_WITH_PIPELINE
-    if empty(substitute(a:line.current.text, ' ', '', 'g'))
-          \ || a:line.current.text =~ s:STARTS_WITH_PIPELINE
-      return indent(a:line.last_non_blank.num)
-    elseif a:line.last_non_blank.text !~ s:INDENT_KEYWORDS
-      let ind = b:old_ind.pipeline
-      unlet b:old_ind.pipeline
-      return ind
+function! elixir#indent#handle_starts_with_pipe(lnum, text, prev_nb_lnum, prev_nb_text)
+  if elixir#indent#starts_with(a:text, '|>', a:lnum)
+    let match_operator = '\%(!\|=\|<\|>\)\@<!=\%(=\|>\|\~\)\@!'
+    let pos = elixir#indent#find_last_pos(a:prev_nb_lnum, a:prev_nb_text, match_operator)
+    if pos == -1
+      return indent(a:prev_nb_lnum)
+    else
+      let next_word_pos = match(strpart(a:prev_nb_text, pos+1, len(a:prev_nb_text)-1), '\S')
+      if next_word_pos == -1
+        return indent(a:prev_nb_lnum) + &sw
+      else
+        return pos + 1 + next_word_pos
+      end
     end
-  end
+  else
+    return -1
+  endif
+endfunction
 
-  return a:ind
+function! elixir#indent#handle_starts_with_comment(_lnum, text, prev_nb_lnum, _prev_nb_text)
+  if elixir#indent#starts_with_comment(a:text)
+    return indent(a:prev_nb_lnum)
+  else
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_assignment(ind, line)
-  if a:line.last_non_blank.text =~ s:ENDING_WITH_ASSIGNMENT
-    let b:old_ind.pipeline = indent(a:line.last_non_blank.num) " FIXME: side effect
-    return a:ind + &sw
+function! elixir#indent#handle_starts_with_end(lnum, text, _prev_nb_lnum, _prev_nb_text)
+  if elixir#indent#starts_with(a:text, elixir#indent#keyword('end'), a:lnum)
+    let pair_lnum = elixir#indent#searchpair_back(elixir#indent#keyword('do\|fn'), '', elixir#indent#keyword('end').'\zs')
+    return indent(pair_lnum)
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_brackets(ind, line)
-  if s:pending_brackets(a:line) > 0
-    return a:ind + &sw
+function! elixir#indent#handle_starts_with_mid_or_end_block_keyword(lnum, text, _prev_nb_lnum, _prev_nb_text)
+  if elixir#indent#starts_with(a:text, elixir#indent#keyword('catch\|rescue\|after\|else'), a:lnum)
+    let pair_lnum = elixir#indent#searchpair_back(elixir#indent#keyword('with\|receive\|try\|if\|fn'), elixir#indent#keyword('catch\|rescue\|after\|else').'\zs', elixir#indent#keyword('end'))
+    return indent(pair_lnum)
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_case_arrow(ind, line)
-  if a:line.last_non_blank.text =~ s:END_WITH_ARROW && a:line.last_non_blank.text !~ '\<fn\>'
-    let b:old_ind.arrow = a:ind
-    return a:ind + &sw
+function! elixir#indent#handle_starts_with_close_bracket(lnum, text, _prev_nb_lnum, _prev_nb_text)
+  if elixir#indent#starts_with(a:text, '\%(\]\|}\|)\)', a:lnum)
+    let pair_lnum = elixir#indent#searchpair_back('\%(\[\|{\|(\)', '', '\%(\]\|}\|)\)')
+    return indent(pair_lnum)
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_ending_symbols(ind, line)
-  if a:line.last_non_blank.text =~ '^\s*\('.s:ENDING_SYMBOLS.'\)\s*$'
-    return a:ind + &sw
+function! elixir#indent#handle_starts_with_binary_operator(lnum, text, prev_nb_lnum, prev_nb_text)
+  let binary_operator = '\%(=\|<>\|>>>\|<=\|||\|+\|\~\~\~\|-\|&&\|<<<\|/\|\^\^\^\|\*\)'
+
+  if elixir#indent#starts_with(a:text, binary_operator, a:lnum)
+    let match_operator = '\%(!\|=\|<\|>\)\@<!=\%(=\|>\|\~\)\@!'
+    let pos = elixir#indent#find_last_pos(a:prev_nb_lnum, a:prev_nb_text, match_operator)
+    if pos == -1
+      return indent(a:prev_nb_lnum)
+    else
+      let next_word_pos = match(strpart(a:prev_nb_text, pos+1, len(a:prev_nb_text)-1), '\S')
+      if next_word_pos == -1
+        return indent(a:prev_nb_lnum) + &sw
+      else
+        return pos + 1 + next_word_pos
+      end
+    end
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_keywords(ind, line)
-  if a:line.last_non_blank.text =~ s:INDENT_KEYWORDS && a:line.last_non_blank.text !~ s:LINE_COMMENT
-    return a:ind + &sw
+" To handle nested structures properly we need to find the innermost
+" nested structure. For example, we might be in a function in a map in a
+" function, etc... so we need to first figure out what the innermost structure
+" is then forward execution to the proper handler
+function! elixir#indent#handle_inside_nested_construct(lnum, text, prev_nb_lnum, prev_nb_text)
+  let start_pattern = '\C\%(\<if\>\|\<case\>\|\<cond\>\|\<try\>\|\<receive\>\|\<fn\>\|{\|\[\|(\)'
+  let end_pattern = '\C\%(\<end\>\|\]\|}\|)\)'
+  let pair_info = elixir#indent#searchpairpos_back(start_pattern, '', end_pattern)
+  let pair_lnum = pair_info[0]
+  let pair_col = pair_info[1]
+  if pair_lnum != 0 || pair_col != 0
+    let pair_text = getline(pair_lnum)
+    let pair_char = pair_text[pair_col - 1]
+    if pair_char == 'f'
+      call elixir#indent#debug("testing elixir#indent#do_handle_inside_fn")
+      return elixir#indent#do_handle_inside_fn(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
+    elseif pair_char == '['
+      call elixir#indent#debug("testing elixir#indent#do_handle_inside_square_brace")
+      return elixir#indent#do_handle_inside_square_brace(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
+    elseif pair_char == '{'
+      call elixir#indent#debug("testing elixir#indent#do_handle_inside_curly_brace")
+      return elixir#indent#do_handle_inside_curly_brace(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
+    elseif pair_char == '('
+      call elixir#indent#debug("testing elixir#indent#do_handle_inside_parens")
+      return elixir#indent#do_handle_inside_parens(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
+    else
+      call elixir#indent#debug("testing elixir#indent#do_handle_inside_keyword_block")
+      return elixir#indent#do_handle_inside_keyword_block(pair_lnum, pair_col, a:lnum, a:text, a:prev_nb_lnum, a:prev_nb_text)
+    end
   else
-    return a:ind
+    return -1
   end
 endfunction
 
-function! elixir#indent#indent_parenthesis(ind, line)
-  if s:pending_parenthesis(a:line) > 0
-        \ && a:line.last_non_blank.text !~ s:DEF
-        \ && a:line.last_non_blank.text !~ s:END_WITH_ARROW
-    let b:old_ind.symbol = a:ind
-    return matchend(a:line.last_non_blank.text, '(')
+function! elixir#indent#do_handle_inside_keyword_block(pair_lnum, _pair_col, _lnum, text, prev_nb_lnum, prev_nb_text)
+  let keyword_pattern = '\C\%(\<case\>\|\<cond\>\|\<try\>\|\<receive\>\|\<after\>\|\<catch\>\|\<rescue\>\|\<else\>\)'
+  if a:pair_lnum
+      " last line is a "receive" or something
+    if elixir#indent#starts_with(a:prev_nb_text, keyword_pattern, a:prev_nb_lnum)
+      call elixir#indent#debug("prev nb line is keyword")
+      return indent(a:prev_nb_lnum) + &sw
+    elseif elixir#indent#contains(a:text, '->')
+      call elixir#indent#debug("contains ->")
+      " TODO: @jbodah 2017-03-31: test contains ignores str + comments
+      return indent(a:pair_lnum) + &sw
+    elseif elixir#indent#contains(a:prev_nb_text, '->')
+      call elixir#indent#debug("prev nb line contains ->")
+      return indent(a:prev_nb_lnum) + &sw
+    else
+      call elixir#indent#debug("doesnt start with comment or contain ->")
+      return indent(a:prev_nb_lnum)
+    end
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_pipeline_assignment(ind, line)
-  if a:line.current.text =~ s:STARTS_WITH_PIPELINE
-        \ && a:line.last_non_blank.text =~ s:MATCH_OPERATOR
-    let b:old_ind.pipeline = indent(a:line.last_non_blank.num)
-    " if line starts with pipeline
-    " and last_non_blank line is an attribution
-    " indents pipeline in same level as attribution
-    let assign_pos = match(a:line.last_non_blank.text, '=\s*\zs[^ ]')
-    return (elixir#util#is_indentable_at(a:line.last_non_blank.num, assign_pos) ? assign_pos : a:ind)
+function! elixir#indent#do_handle_inside_fn(pair_lnum, _pair_col, lnum, text, prev_nb_lnum, prev_nb_text)
+  if a:pair_lnum && a:pair_lnum != a:lnum
+    if elixir#indent#contains(a:text, '->')
+      return indent(a:pair_lnum) + &sw
+    else
+      if elixir#indent#ends_with(a:prev_nb_text, '->', a:prev_nb_lnum)
+        return indent(a:prev_nb_lnum) + &sw
+      else
+        return indent(a:prev_nb_lnum)
+      end
+    end
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_pipeline_continuation(ind, line)
-  if a:line.last_non_blank.text =~ s:STARTS_WITH_PIPELINE
-        \ && a:line.current.text =~ s:STARTS_WITH_PIPELINE
-    return indent(a:line.last_non_blank.num)
+function! elixir#indent#do_handle_inside_square_brace(pair_lnum, pair_col, _lnum, _text, _prev_nb_lnum, _prev_nb_text)
+  " If in list...
+  if a:pair_lnum != 0 || a:pair_col != 0
+    let pair_text = getline(a:pair_lnum)
+    let substr = strpart(pair_text, a:pair_col, len(pair_text)-1)
+    let indent_pos = match(substr, '\S')
+    if indent_pos != -1
+      return indent_pos + a:pair_col
+    else
+      return indent(a:pair_lnum) + &sw
+    endif
   else
-    return a:ind
+    return -1
   end
 endfunction
 
-function! elixir#indent#indent_square_brackets(ind, line)
-  if s:pending_square_brackets(a:line) > 0
-    if a:line.last_non_blank.text =~ '[\s*$'
-      return a:ind + &sw
+function! elixir#indent#do_handle_inside_curly_brace(pair_lnum, _pair_col, _lnum, _text, _prev_nb_lnum, _prev_nb_text)
+  return indent(a:pair_lnum) + &sw
+endfunction
+
+function! elixir#indent#do_handle_inside_parens(pair_lnum, pair_col, _lnum, _text, prev_nb_lnum, prev_nb_text)
+  if a:pair_lnum
+    if elixir#indent#ends_with(a:prev_nb_text, '(', a:prev_nb_lnum)
+      return indent(a:prev_nb_lnum) + &sw
+    elseif a:pair_lnum == a:prev_nb_lnum
+      " Align indent (e.g. "def add(a,")
+      let pos = elixir#indent#find_last_pos(a:prev_nb_lnum, a:prev_nb_text, '[^(]\+,')
+      if pos == -1
+        return 0
+      else
+        return pos
+      end
     else
-      " if start symbol is followed by a character, indent based on the
-      " whitespace after the symbol, otherwise use the default shiftwidth
-      " Avoid negative indentation index
-      return matchend(a:line.last_non_blank.text, '[\s*')
+      return indent(a:prev_nb_lnum)
     end
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
-function! elixir#indent#indent_ecto_queries(ind, line)
-  if a:line.last_non_blank.text =~ s:QUERY_FROM
-    return a:ind + &sw
+function! elixir#indent#handle_inside_generic_block(lnum, _text, prev_nb_lnum, prev_nb_text)
+  let pair_lnum = searchpair(elixir#indent#keyword('do\|fn'), '', elixir#indent#keyword('end'), 'bW', "line('.') == ".a:lnum." || elixir#indent#is_string_or_comment(line('.'), col('.'))")
+  if pair_lnum
+    " TODO: @jbodah 2017-03-29: this should probably be the case in *all*
+    " blocks
+    if elixir#indent#ends_with(a:prev_nb_text, ',', a:prev_nb_lnum)
+      return indent(pair_lnum) + 2 * &sw
+    else
+      return indent(pair_lnum) + &sw
+    endif
   else
-    return a:ind
-  end
+    return -1
+  endif
 endfunction
 
 endif
diff --git a/autoload/elixir/util.vim b/autoload/elixir/util.vim
index fbbd62aa..46db20e0 100644
--- a/autoload/elixir/util.vim
+++ b/autoload/elixir/util.vim
@@ -1,52 +1,28 @@
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'elixir') == -1
   
-let s:SKIP_SYNTAX = '\%(Comment\|String\)$'
+function! elixir#util#get_filename(word) abort
+  let word = a:word
 
-function! elixir#util#is_indentable_at(line, col)
-  if a:col == -1 " skip synID lookup for not found match
-    return 1
-  end
-  " TODO: Remove these 2 lines
-  " I don't know why, but for the test on spec/indent/lists_spec.rb:24.
-  " Vim is making some mess on parsing the syntax of 'end', it is being
-  " recognized as 'elixirString' when should be recognized as 'elixirBlock'.
-  call synID(a:line, a:col, 1)
-  " This forces vim to sync the syntax. Using fromstart is very slow on files
-  " over 1k lines
-  syntax sync minlines=20 maxlines=150
+  " get first thing that starts uppercase, until the first space or end of line
+  let word = substitute(word,'^\s*\(\u[^ ]\+\).*$','\1','g')
 
-  return synIDattr(synID(a:line, a:col, 1), "name")
-        \ !~ s:SKIP_SYNTAX
-endfunction
-
-function! elixir#util#count_indentable_symbol_diff(line, open, close)
-  return
-        \   s:match_count(a:line, a:open)
-        \ - s:match_count(a:line, a:close)
-endfunction
+  " remove any trailing characters that don't look like a nested module
+  let word = substitute(word,'\.\U.*$','','g')
 
-function! s:match_count(line, pattern)
-  let size = strlen(a:line.text)
-  let index = 0
-  let counter = 0
+  " replace module dots with slash
+  let word = substitute(word,'\.','/','g')
 
-  while index < size
-    let index = match(a:line.text, a:pattern, index)
-    if index >= 0
-      let index += 1
-      if elixir#util#is_indentable_at(a:line.num, index)
-        let counter +=1
-      end
-    else
-      break
-    end
-  endwhile
+  " remove any special chars
+  let word = substitute(word,'[^A-z0-9-_/]','','g')
 
-  return counter
-endfunction
+  " convert to snake_case
+  let word = substitute(word,'\(\u\+\)\(\u\l\)','\1_\2','g')
+  let word = substitute(word,'\(\u\+\)\(\u\l\)','\1_\2','g')
+  let word = substitute(word,'\(\l\|\d\)\(\u\)','\1_\2','g')
+  let word = substitute(word,'-','_','g')
+  let word = tolower(word)
 
-function elixir#util#is_blank(string)
-  return a:string =~ '^\s*$'
+  return word
 endfunction
 
 endif