diff --git a/runtime/indent/eruby.vim b/runtime/indent/eruby.vim
index 5058325..6ff15ab 100644
--- a/runtime/indent/eruby.vim
+++ b/runtime/indent/eruby.vim
@@ -3,6 +3,7 @@
 " Maintainer:		Tim Pope <vimNOSPAM@tpope.org>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:		2019 Jan 06
 
 if exists("b:did_indent")
   finish
@@ -12,7 +13,7 @@
 unlet! b:did_indent
 setlocal indentexpr=
 
-if exists("b:eruby_subtype")
+if exists("b:eruby_subtype") && b:eruby_subtype != '' && b:eruby_subtype !=# 'eruby'
   exe "runtime! indent/".b:eruby_subtype.".vim"
 else
   runtime! indent/html.vim
@@ -47,7 +48,11 @@
 
 function! GetErubyIndent(...)
   " The value of a single shift-width
-  let sw = shiftwidth()
+  if exists('*shiftwidth')
+    let sw = shiftwidth()
+  else
+    let sw = &sw
+  endif
 
   if a:0 && a:1 == '.'
     let v:lnum = line('.')
@@ -91,6 +96,7 @@
     let ind = ind + sw
   endif
   if line !~# '^\s*<%' && line =~# '%>\s*$' && line !~# '^\s*end\>'
+	\ && synID(v:lnum, match(cline, '\S') + 1, 1) != hlID('htmlEndTag')
     let ind = ind - sw
   endif
   if cline =~# '^\s*[-=]\=%>\s*$'
diff --git a/runtime/indent/ruby.vim b/runtime/indent/ruby.vim
index d8733db..5c420d7 100644
--- a/runtime/indent/ruby.vim
+++ b/runtime/indent/ruby.vim
@@ -1,8 +1,10 @@
 " Vim indent file
 " Language:		Ruby
-" Maintainer:		Nikolai Weibull <now at bitwi.se>
+" Maintainer:		Andrew Radev <andrey.radev@gmail.com>
+" Previous Maintainer:	Nikolai Weibull <now at bitwi.se>
 " URL:			https://github.com/vim-ruby/vim-ruby
 " Release Coordinator:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:		2019 Jan 06
 
 " 0. Initialization {{{1
 " =================
@@ -18,6 +20,11 @@
   let g:ruby_indent_access_modifier_style = 'normal'
 endif
 
+if !exists('g:ruby_indent_assignment_style')
+  " Possible values: "variable", "hanging"
+  let g:ruby_indent_assignment_style = 'hanging'
+endif
+
 if !exists('g:ruby_indent_block_style')
   " Possible values: "expression", "do"
   let g:ruby_indent_block_style = 'expression'
@@ -42,28 +49,27 @@
 " 1. Variables {{{1
 " ============
 
-" Regex of syntax group names that are or delimit strings/symbols or are comments.
-let s:syng_strcom = '\<ruby\%(Regexp\|RegexpDelimiter\|RegexpEscape' .
-      \ '\|Symbol\|String\|StringDelimiter\|StringEscape\|ASCIICode' .
-      \ '\|Interpolation\|InterpolationDelimiter\|NoInterpolation\|Comment\|Documentation\)\>'
-
-" Regex of syntax group names that are strings.
+" Syntax group names that are strings.
 let s:syng_string =
-      \ '\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\)\>'
+      \ ['String', 'Interpolation', 'InterpolationDelimiter', 'NoInterpolation', 'StringEscape']
 
-" Regex of syntax group names that are strings or documentation.
-let s:syng_stringdoc =
-      \'\<ruby\%(String\|Interpolation\|NoInterpolation\|StringEscape\|Documentation\)\>'
+" Syntax group names that are strings or documentation.
+let s:syng_stringdoc = s:syng_string + ['Documentation']
+
+" Syntax group names that are or delimit strings/symbols/regexes or are comments.
+let s:syng_strcom = s:syng_stringdoc +
+      \ ['Regexp', 'RegexpDelimiter', 'RegexpEscape',
+      \ 'Symbol', 'StringDelimiter', 'ASCIICode', 'Comment']
 
 " Expression used to check whether we should skip a match with searchpair().
 let s:skip_expr =
-      \ "synIDattr(synID(line('.'),col('.'),1),'name') =~ '".s:syng_strcom."'"
+      \ 'index(map('.string(s:syng_strcom).',"hlID(''ruby''.v:val)"), synID(line("."),col("."),1)) >= 0'
 
 " Regex used for words that, at the start of a line, add a level of indent.
 let s:ruby_indent_keywords =
       \ '^\s*\zs\<\%(module\|class\|if\|for' .
       \   '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure\|rescue' .
-      \   '\|\%(public\|protected\|private\)\=\s*def\):\@!\>' .
+      \   '\|\%(\K\k*[!?]\?\)\=\s*def\):\@!\>' .
       \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' .
       \    '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>'
 
@@ -77,7 +83,7 @@
 let s:end_start_regex =
       \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
       \ '\<\%(module\|class\|if\|for\|while\|until\|case\|unless\|begin' .
-      \   '\|\%(public\|protected\|private\)\=\s*def\):\@!\>' .
+      \   '\|\%(\K\k*[!?]\?\)\=\s*def\):\@!\>' .
       \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'
 
 " Regex that defines the middle-match for the 'end' keyword.
@@ -142,31 +148,562 @@
 " Regex that describes a leading operator (only a method call's dot for now)
 let s:leading_operator_regex = '^\s*[.]'
 
-" 2. Auxiliary Functions {{{1
+" 2. GetRubyIndent Function {{{1
+" =========================
+
+function! GetRubyIndent(...) abort
+  " 2.1. Setup {{{2
+  " ----------
+
+  let indent_info = {}
+
+  " The value of a single shift-width
+  if exists('*shiftwidth')
+    let indent_info.sw = shiftwidth()
+  else
+    let indent_info.sw = &sw
+  endif
+
+  " For the current line, use the first argument if given, else v:lnum
+  let indent_info.clnum = a:0 ? a:1 : v:lnum
+  let indent_info.cline = getline(indent_info.clnum)
+
+  " Set up variables for restoring position in file.  Could use clnum here.
+  let indent_info.col = col('.')
+
+  " 2.2. Work on the current line {{{2
+  " -----------------------------
+  let indent_callback_names = [
+        \ 's:AccessModifier',
+        \ 's:ClosingBracketOnEmptyLine',
+        \ 's:BlockComment',
+        \ 's:DeindentingKeyword',
+        \ 's:MultilineStringOrLineComment',
+        \ 's:ClosingHeredocDelimiter',
+        \ 's:LeadingOperator',
+        \ ]
+
+  for callback_name in indent_callback_names
+"    Decho "Running: ".callback_name
+    let indent = call(function(callback_name), [indent_info])
+
+    if indent >= 0
+"      Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info)
+      return indent
+    endif
+  endfor
+
+  " 2.3. Work on the previous line. {{{2
+  " -------------------------------
+
+  " Special case: we don't need the real s:PrevNonBlankNonString for an empty
+  " line inside a string. And that call can be quite expensive in that
+  " particular situation.
+  let indent_callback_names = [
+        \ 's:EmptyInsideString',
+        \ ]
+
+  for callback_name in indent_callback_names
+"    Decho "Running: ".callback_name
+    let indent = call(function(callback_name), [indent_info])
+
+    if indent >= 0
+"      Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info)
+      return indent
+    endif
+  endfor
+
+  " Previous line number
+  let indent_info.plnum = s:PrevNonBlankNonString(indent_info.clnum - 1)
+  let indent_info.pline = getline(indent_info.plnum)
+
+  let indent_callback_names = [
+        \ 's:StartOfFile',
+        \ 's:AfterAccessModifier',
+        \ 's:ContinuedLine',
+        \ 's:AfterBlockOpening',
+        \ 's:AfterHangingSplat',
+        \ 's:AfterUnbalancedBracket',
+        \ 's:AfterLeadingOperator',
+        \ 's:AfterEndKeyword',
+        \ 's:AfterIndentKeyword',
+        \ ]
+
+  for callback_name in indent_callback_names
+"    Decho "Running: ".callback_name
+    let indent = call(function(callback_name), [indent_info])
+
+    if indent >= 0
+"      Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info)
+      return indent
+    endif
+  endfor
+
+  " 2.4. Work on the MSL line. {{{2
+  " --------------------------
+  let indent_callback_names = [
+        \ 's:PreviousNotMSL',
+        \ 's:IndentingKeywordInMSL',
+        \ 's:ContinuedHangingOperator',
+        \ ]
+
+  " Most Significant line based on the previous one -- in case it's a
+  " contination of something above
+  let indent_info.plnum_msl = s:GetMSL(indent_info.plnum)
+
+  for callback_name in indent_callback_names
+"    Decho "Running: ".callback_name
+    let indent = call(function(callback_name), [indent_info])
+
+    if indent >= 0
+"      Decho "Match: ".callback_name." indent=".indent." info=".string(indent_info)
+      return indent
+    endif
+  endfor
+
+  " }}}2
+
+  " By default, just return the previous line's indent
+"  Decho "Default case matched"
+  return indent(indent_info.plnum)
+endfunction
+
+" 3. Indenting Logic Callbacks {{{1
+" ============================
+
+function! s:AccessModifier(cline_info) abort
+  let info = a:cline_info
+
+  " If this line is an access modifier keyword, align according to the closest
+  " class declaration.
+  if g:ruby_indent_access_modifier_style == 'indent'
+    if s:Match(info.clnum, s:access_modifier_regex)
+      let class_lnum = s:FindContainingClass()
+      if class_lnum > 0
+        return indent(class_lnum) + info.sw
+      endif
+    endif
+  elseif g:ruby_indent_access_modifier_style == 'outdent'
+    if s:Match(info.clnum, s:access_modifier_regex)
+      let class_lnum = s:FindContainingClass()
+      if class_lnum > 0
+        return indent(class_lnum)
+      endif
+    endif
+  endif
+
+  return -1
+endfunction
+
+function! s:ClosingBracketOnEmptyLine(cline_info) abort
+  let info = a:cline_info
+
+  " If we got a closing bracket on an empty line, find its match and indent
+  " according to it.  For parentheses we indent to its column - 1, for the
+  " others we indent to the containing line's MSL's level.  Return -1 if fail.
+  let col = matchend(info.cline, '^\s*[]})]')
+
+  if col > 0 && !s:IsInStringOrComment(info.clnum, col)
+    call cursor(info.clnum, col)
+    let closing_bracket = info.cline[col - 1]
+    let bracket_pair = strpart('(){}[]', stridx(')}]', closing_bracket) * 2, 2)
+
+    if searchpair(escape(bracket_pair[0], '\['), '', bracket_pair[1], 'bW', s:skip_expr) > 0
+      if closing_bracket == ')' && col('.') != col('$') - 1
+        let ind = virtcol('.') - 1
+      elseif g:ruby_indent_block_style == 'do'
+        let ind = indent(line('.'))
+      else " g:ruby_indent_block_style == 'expression'
+        let ind = indent(s:GetMSL(line('.')))
+      endif
+    endif
+
+    return ind
+  endif
+
+  return -1
+endfunction
+
+function! s:BlockComment(cline_info) abort
+  " If we have a =begin or =end set indent to first column.
+  if match(a:cline_info.cline, '^\s*\%(=begin\|=end\)$') != -1
+    return 0
+  endif
+  return -1
+endfunction
+
+function! s:DeindentingKeyword(cline_info) abort
+  let info = a:cline_info
+
+  " If we have a deindenting keyword, find its match and indent to its level.
+  " TODO: this is messy
+  if s:Match(info.clnum, s:ruby_deindent_keywords)
+    call cursor(info.clnum, 1)
+
+    if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
+          \ s:end_skip_expr) > 0
+      let msl  = s:GetMSL(line('.'))
+      let line = getline(line('.'))
+
+      if s:IsAssignment(line, col('.')) &&
+            \ strpart(line, col('.') - 1, 2) !~ 'do'
+        " assignment to case/begin/etc, on the same line
+        if g:ruby_indent_assignment_style == 'hanging'
+          " hanging indent
+          let ind = virtcol('.') - 1
+        else
+          " align with variable
+          let ind = indent(line('.'))
+        endif
+      elseif g:ruby_indent_block_style == 'do'
+        " align to line of the "do", not to the MSL
+        let ind = indent(line('.'))
+      elseif getline(msl) =~ '=\s*\(#.*\)\=$'
+        " in the case of assignment to the MSL, align to the starting line,
+        " not to the MSL
+        let ind = indent(line('.'))
+      else
+        " align to the MSL
+        let ind = indent(msl)
+      endif
+    endif
+    return ind
+  endif
+
+  return -1
+endfunction
+
+function! s:MultilineStringOrLineComment(cline_info) abort
+  let info = a:cline_info
+
+  " If we are in a multi-line string or line-comment, don't do anything to it.
+  if s:IsInStringOrDocumentation(info.clnum, matchend(info.cline, '^\s*') + 1)
+    return indent(info.clnum)
+  endif
+  return -1
+endfunction
+
+function! s:ClosingHeredocDelimiter(cline_info) abort
+  let info = a:cline_info
+
+  " If we are at the closing delimiter of a "<<" heredoc-style string, set the
+  " indent to 0.
+  if info.cline =~ '^\k\+\s*$'
+        \ && s:IsInStringDelimiter(info.clnum, 1)
+        \ && search('\V<<'.info.cline, 'nbW') > 0
+    return 0
+  endif
+
+  return -1
+endfunction
+
+function! s:LeadingOperator(cline_info) abort
+  " If the current line starts with a leading operator, add a level of indent.
+  if s:Match(a:cline_info.clnum, s:leading_operator_regex)
+    return indent(s:GetMSL(a:cline_info.clnum)) + a:cline_info.sw
+  endif
+  return -1
+endfunction
+
+function! s:EmptyInsideString(pline_info) abort
+  " If the line is empty and inside a string (the previous line is a string,
+  " too), use the previous line's indent
+  let info = a:pline_info
+
+  let plnum = prevnonblank(info.clnum - 1)
+  let pline = getline(plnum)
+
+  if info.cline =~ '^\s*$'
+        \ && s:IsInStringOrComment(plnum, 1)
+        \ && s:IsInStringOrComment(plnum, strlen(pline))
+    return indent(plnum)
+  endif
+  return -1
+endfunction
+
+function! s:StartOfFile(pline_info) abort
+  " At the start of the file use zero indent.
+  if a:pline_info.plnum == 0
+    return 0
+  endif
+  return -1
+endfunction
+
+function! s:AfterAccessModifier(pline_info) abort
+  let info = a:pline_info
+
+  if g:ruby_indent_access_modifier_style == 'indent'
+    " If the previous line was a private/protected keyword, add a
+    " level of indent.
+    if s:Match(info.plnum, s:indent_access_modifier_regex)
+      return indent(info.plnum) + info.sw
+    endif
+  elseif g:ruby_indent_access_modifier_style == 'outdent'
+    " If the previous line was a private/protected/public keyword, add
+    " a level of indent, since the keyword has been out-dented.
+    if s:Match(info.plnum, s:access_modifier_regex)
+      return indent(info.plnum) + info.sw
+    endif
+  endif
+  return -1
+endfunction
+
+" Example:
+"
+"   if foo || bar ||
+"       baz || bing
+"     puts "foo"
+"   end
+"
+function! s:ContinuedLine(pline_info) abort
+  let info = a:pline_info
+
+  let col = s:Match(info.plnum, s:ruby_indent_keywords)
+  if s:Match(info.plnum, s:continuable_regex) &&
+        \ s:Match(info.plnum, s:continuation_regex)
+    if col > 0 && s:IsAssignment(info.pline, col)
+      if g:ruby_indent_assignment_style == 'hanging'
+        " hanging indent
+        let ind = col - 1
+      else
+        " align with variable
+        let ind = indent(info.plnum)
+      endif
+    else
+      let ind = indent(s:GetMSL(info.plnum))
+    endif
+    return ind + info.sw + info.sw
+  endif
+  return -1
+endfunction
+
+function! s:AfterBlockOpening(pline_info) abort
+  let info = a:pline_info
+
+  " If the previous line ended with a block opening, add a level of indent.
+  if s:Match(info.plnum, s:block_regex)
+    if g:ruby_indent_block_style == 'do'
+      " don't align to the msl, align to the "do"
+      let ind = indent(info.plnum) + info.sw
+    else
+      let plnum_msl = s:GetMSL(info.plnum)
+
+      if getline(plnum_msl) =~ '=\s*\(#.*\)\=$'
+        " in the case of assignment to the msl, align to the starting line,
+        " not to the msl
+        let ind = indent(info.plnum) + info.sw
+      else
+        let ind = indent(plnum_msl) + info.sw
+      endif
+    endif
+
+    return ind
+  endif
+
+  return -1
+endfunction
+
+function! s:AfterLeadingOperator(pline_info) abort
+  " If the previous line started with a leading operator, use its MSL's level
+  " of indent
+  if s:Match(a:pline_info.plnum, s:leading_operator_regex)
+    return indent(s:GetMSL(a:pline_info.plnum))
+  endif
+  return -1
+endfunction
+
+function! s:AfterHangingSplat(pline_info) abort
+  let info = a:pline_info
+
+  " If the previous line ended with the "*" of a splat, add a level of indent
+  if info.pline =~ s:splat_regex
+    return indent(info.plnum) + info.sw
+  endif
+  return -1
+endfunction
+
+function! s:AfterUnbalancedBracket(pline_info) abort
+  let info = a:pline_info
+
+  " If the previous line contained unclosed opening brackets and we are still
+  " in them, find the rightmost one and add indent depending on the bracket
+  " type.
+  "
+  " If it contained hanging closing brackets, find the rightmost one, find its
+  " match and indent according to that.
+  if info.pline =~ '[[({]' || info.pline =~ '[])}]\s*\%(#.*\)\=$'
+    let [opening, closing] = s:ExtraBrackets(info.plnum)
+
+    if opening.pos != -1
+      if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
+        if col('.') + 1 == col('$')
+          return indent(info.plnum) + info.sw
+        else
+          return virtcol('.')
+        endif
+      else
+        let nonspace = matchend(info.pline, '\S', opening.pos + 1) - 1
+        return nonspace > 0 ? nonspace : indent(info.plnum) + info.sw
+      endif
+    elseif closing.pos != -1
+      call cursor(info.plnum, closing.pos + 1)
+      normal! %
+
+      if s:Match(line('.'), s:ruby_indent_keywords)
+        return indent('.') + info.sw
+      else
+        return indent(s:GetMSL(line('.')))
+      endif
+    else
+      call cursor(info.clnum, info.col)
+    end
+  endif
+
+  return -1
+endfunction
+
+function! s:AfterEndKeyword(pline_info) abort
+  let info = a:pline_info
+  " If the previous line ended with an "end", match that "end"s beginning's
+  " indent.
+  let col = s:Match(info.plnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
+  if col > 0
+    call cursor(info.plnum, col)
+    if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
+          \ s:end_skip_expr) > 0
+      let n = line('.')
+      let ind = indent('.')
+      let msl = s:GetMSL(n)
+      if msl != n
+        let ind = indent(msl)
+      end
+      return ind
+    endif
+  end
+  return -1
+endfunction
+
+function! s:AfterIndentKeyword(pline_info) abort
+  let info = a:pline_info
+  let col = s:Match(info.plnum, s:ruby_indent_keywords)
+
+  if col > 0
+    call cursor(info.plnum, col)
+    let ind = virtcol('.') - 1 + info.sw
+    " TODO: make this better (we need to count them) (or, if a searchpair
+    " fails, we know that something is lacking an end and thus we indent a
+    " level
+    if s:Match(info.plnum, s:end_end_regex)
+      let ind = indent('.')
+    elseif s:IsAssignment(info.pline, col)
+      if g:ruby_indent_assignment_style == 'hanging'
+        " hanging indent
+        let ind = col + info.sw - 1
+      else
+        " align with variable
+        let ind = indent(info.plnum) + info.sw
+      endif
+    endif
+    return ind
+  endif
+
+  return -1
+endfunction
+
+function! s:PreviousNotMSL(msl_info) abort
+  let info = a:msl_info
+
+  " If the previous line wasn't a MSL
+  if info.plnum != info.plnum_msl
+    " If previous line ends bracket and begins non-bracket continuation decrease indent by 1.
+    if s:Match(info.plnum, s:bracket_switch_continuation_regex)
+      " TODO (2016-10-07) Wrong/unused? How could it be "1"?
+      return indent(info.plnum) - 1
+      " If previous line is a continuation return its indent.
+      " TODO: the || s:IsInString() thing worries me a bit.
+    elseif s:Match(info.plnum, s:non_bracket_continuation_regex) || s:IsInString(info.plnum, strlen(line))
+      return indent(info.plnum)
+    endif
+  endif
+
+  return -1
+endfunction
+
+function! s:IndentingKeywordInMSL(msl_info) abort
+  let info = a:msl_info
+  " If the MSL line had an indenting keyword in it, add a level of indent.
+  " TODO: this does not take into account contrived things such as
+  " module Foo; class Bar; end
+  let col = s:Match(info.plnum_msl, s:ruby_indent_keywords)
+  if col > 0
+    let ind = indent(info.plnum_msl) + info.sw
+    if s:Match(info.plnum_msl, s:end_end_regex)
+      let ind = ind - info.sw
+    elseif s:IsAssignment(getline(info.plnum_msl), col)
+      if g:ruby_indent_assignment_style == 'hanging'
+        " hanging indent
+        let ind = col + info.sw - 1
+      else
+        " align with variable
+        let ind = indent(info.plnum_msl) + info.sw
+      endif
+    endif
+    return ind
+  endif
+  return -1
+endfunction
+
+function! s:ContinuedHangingOperator(msl_info) abort
+  let info = a:msl_info
+
+  " If the previous line ended with [*+/.,-=], but wasn't a block ending or a
+  " closing bracket, indent one extra level.
+  if s:Match(info.plnum_msl, s:non_bracket_continuation_regex) && !s:Match(info.plnum_msl, '^\s*\([\])}]\|end\)')
+    if info.plnum_msl == info.plnum
+      let ind = indent(info.plnum_msl) + info.sw
+    else
+      let ind = indent(info.plnum_msl)
+    endif
+    return ind
+  endif
+
+  return -1
+endfunction
+
+" 4. Auxiliary Functions {{{1
 " ======================
 
+function! s:IsInRubyGroup(groups, lnum, col) abort
+  let ids = map(copy(a:groups), 'hlID("ruby".v:val)')
+  return index(ids, synID(a:lnum, a:col, 1)) >= 0
+endfunction
+
 " Check if the character at lnum:col is inside a string, comment, or is ascii.
-function s:IsInStringOrComment(lnum, col)
-  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
+function! s:IsInStringOrComment(lnum, col) abort
+  return s:IsInRubyGroup(s:syng_strcom, a:lnum, a:col)
 endfunction
 
 " Check if the character at lnum:col is inside a string.
-function s:IsInString(lnum, col)
-  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
+function! s:IsInString(lnum, col) abort
+  return s:IsInRubyGroup(s:syng_string, a:lnum, a:col)
 endfunction
 
 " Check if the character at lnum:col is inside a string or documentation.
-function s:IsInStringOrDocumentation(lnum, col)
-  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
+function! s:IsInStringOrDocumentation(lnum, col) abort
+  return s:IsInRubyGroup(s:syng_stringdoc, a:lnum, a:col)
 endfunction
 
 " Check if the character at lnum:col is inside a string delimiter
-function s:IsInStringDelimiter(lnum, col)
-  return synIDattr(synID(a:lnum, a:col, 1), 'name') == 'rubyStringDelimiter'
+function! s:IsInStringDelimiter(lnum, col) abort
+  return s:IsInRubyGroup(['StringDelimiter'], a:lnum, a:col)
+endfunction
+
+function! s:IsAssignment(str, pos) abort
+  return strpart(a:str, 0, a:pos - 1) =~ '=\s*$'
 endfunction
 
 " Find line above 'lnum' that isn't empty, in a comment, or in a string.
-function s:PrevNonBlankNonString(lnum)
+function! s:PrevNonBlankNonString(lnum) abort
   let in_block = 0
   let lnum = prevnonblank(a:lnum)
   while lnum > 0
@@ -191,10 +728,9 @@
 endfunction
 
 " Find line above 'lnum' that started the continuation 'lnum' may be part of.
-function s:GetMSL(lnum)
+function! s:GetMSL(lnum) abort
   " Start on the line we're at and use its indent.
   let msl = a:lnum
-  let msl_body = getline(msl)
   let lnum = s:PrevNonBlankNonString(a:lnum - 1)
   while lnum > 0
     " If we have a continuation line, or we're in a string, use line as MSL.
@@ -291,14 +827,13 @@
       endif
     endif
 
-    let msl_body = getline(msl)
     let lnum = s:PrevNonBlankNonString(lnum - 1)
   endwhile
   return msl
 endfunction
 
 " Check if line 'lnum' has more opening brackets than closing ones.
-function s:ExtraBrackets(lnum)
+function! s:ExtraBrackets(lnum) abort
   let opening = {'parentheses': [], 'braces': [], 'brackets': []}
   let closing = {'parentheses': [], 'braces': [], 'brackets': []}
 
@@ -360,7 +895,7 @@
   return [rightmost_opening, rightmost_closing]
 endfunction
 
-function s:Match(lnum, regex)
+function! s:Match(lnum, regex) abort
   let line   = getline(a:lnum)
   let offset = match(line, '\C'.a:regex)
   let col    = offset + 1
@@ -380,7 +915,7 @@
 " Locates the containing class/module's definition line, ignoring nested classes
 " along the way.
 "
-function! s:FindContainingClass()
+function! s:FindContainingClass() abort
   let saved_position = getpos('.')
 
   while searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
@@ -396,297 +931,6 @@
   return 0
 endfunction
 
-" 3. GetRubyIndent Function {{{1
-" =========================
-
-function GetRubyIndent(...)
-  " 3.1. Setup {{{2
-  " ----------
-
-  " The value of a single shift-width
-  let sw = shiftwidth()
-
-  " For the current line, use the first argument if given, else v:lnum
-  let clnum = a:0 ? a:1 : v:lnum
-
-  " Set up variables for restoring position in file.  Could use clnum here.
-  let vcol = col('.')
-
-  " 3.2. Work on the current line {{{2
-  " -----------------------------
-
-  " Get the current line.
-  let line = getline(clnum)
-  let ind = -1
-
-  " If this line is an access modifier keyword, align according to the closest
-  " class declaration.
-  if g:ruby_indent_access_modifier_style == 'indent'
-    if s:Match(clnum, s:access_modifier_regex)
-      let class_line = s:FindContainingClass()
-      if class_line > 0
-        return indent(class_line) + sw
-      endif
-    endif
-  elseif g:ruby_indent_access_modifier_style == 'outdent'
-    if s:Match(clnum, s:access_modifier_regex)
-      let class_line = s:FindContainingClass()
-      if class_line > 0
-        return indent(class_line)
-      endif
-    endif
-  endif
-
-  " If we got a closing bracket on an empty line, find its match and indent
-  " according to it.  For parentheses we indent to its column - 1, for the
-  " others we indent to the containing line's MSL's level.  Return -1 if fail.
-  let col = matchend(line, '^\s*[]})]')
-  if col > 0 && !s:IsInStringOrComment(clnum, col)
-    call cursor(clnum, col)
-    let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
-    if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
-      if line[col-1]==')' && col('.') != col('$') - 1
-        let ind = virtcol('.') - 1
-      elseif g:ruby_indent_block_style == 'do'
-        let ind = indent(line('.'))
-      else " g:ruby_indent_block_style == 'expression'
-        let ind = indent(s:GetMSL(line('.')))
-      endif
-    endif
-    return ind
-  endif
-
-  " If we have a =begin or =end set indent to first column.
-  if match(line, '^\s*\%(=begin\|=end\)$') != -1
-    return 0
-  endif
-
-  " If we have a deindenting keyword, find its match and indent to its level.
-  " TODO: this is messy
-  if s:Match(clnum, s:ruby_deindent_keywords)
-    call cursor(clnum, 1)
-    if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
-          \ s:end_skip_expr) > 0
-      let msl  = s:GetMSL(line('.'))
-      let line = getline(line('.'))
-
-      if strpart(line, 0, col('.') - 1) =~ '=\s*$' &&
-            \ strpart(line, col('.') - 1, 2) !~ 'do'
-        " assignment to case/begin/etc, on the same line, hanging indent
-        let ind = virtcol('.') - 1
-      elseif g:ruby_indent_block_style == 'do'
-        " align to line of the "do", not to the MSL
-        let ind = indent(line('.'))
-      elseif getline(msl) =~ '=\s*\(#.*\)\=$'
-        " in the case of assignment to the MSL, align to the starting line,
-        " not to the MSL
-        let ind = indent(line('.'))
-      else
-        " align to the MSL
-        let ind = indent(msl)
-      endif
-    endif
-    return ind
-  endif
-
-  " If we are in a multi-line string or line-comment, don't do anything to it.
-  if s:IsInStringOrDocumentation(clnum, matchend(line, '^\s*') + 1)
-    return indent('.')
-  endif
-
-  " If we are at the closing delimiter of a "<<" heredoc-style string, set the
-  " indent to 0.
-  if line =~ '^\k\+\s*$'
-        \ && s:IsInStringDelimiter(clnum, 1)
-        \ && search('\V<<'.line, 'nbW') > 0
-    return 0
-  endif
-
-  " If the current line starts with a leading operator, add a level of indent.
-  if s:Match(clnum, s:leading_operator_regex)
-    return indent(s:GetMSL(clnum)) + sw
-  endif
-
-  " 3.3. Work on the previous line. {{{2
-  " -------------------------------
-
-  " Find a non-blank, non-multi-line string line above the current line.
-  let lnum = s:PrevNonBlankNonString(clnum - 1)
-
-  " If the line is empty and inside a string, use the previous line.
-  if line =~ '^\s*$' && lnum != prevnonblank(clnum - 1)
-    return indent(prevnonblank(clnum))
-  endif
-
-  " At the start of the file use zero indent.
-  if lnum == 0
-    return 0
-  endif
-
-  " Set up variables for the previous line.
-  let line = getline(lnum)
-  let ind = indent(lnum)
-
-  if g:ruby_indent_access_modifier_style == 'indent'
-    " If the previous line was a private/protected keyword, add a
-    " level of indent.
-    if s:Match(lnum, s:indent_access_modifier_regex)
-      return indent(lnum) + sw
-    endif
-  elseif g:ruby_indent_access_modifier_style == 'outdent'
-    " If the previous line was a private/protected/public keyword, add
-    " a level of indent, since the keyword has been out-dented.
-    if s:Match(lnum, s:access_modifier_regex)
-      return indent(lnum) + sw
-    endif
-  endif
-
-  if s:Match(lnum, s:continuable_regex) && s:Match(lnum, s:continuation_regex)
-    return indent(s:GetMSL(lnum)) + sw + sw
-  endif
-
-  " If the previous line ended with a block opening, add a level of indent.
-  if s:Match(lnum, s:block_regex)
-    let msl = s:GetMSL(lnum)
-
-    if g:ruby_indent_block_style == 'do'
-      " don't align to the msl, align to the "do"
-      let ind = indent(lnum) + sw
-    elseif getline(msl) =~ '=\s*\(#.*\)\=$'
-      " in the case of assignment to the msl, align to the starting line,
-      " not to the msl
-      let ind = indent(lnum) + sw
-    else
-      let ind = indent(msl) + sw
-    endif
-    return ind
-  endif
-
-  " If the previous line started with a leading operator, use its MSL's level
-  " of indent
-  if s:Match(lnum, s:leading_operator_regex)
-    return indent(s:GetMSL(lnum))
-  endif
-
-  " If the previous line ended with the "*" of a splat, add a level of indent
-  if line =~ s:splat_regex
-    return indent(lnum) + sw
-  endif
-
-  " If the previous line contained unclosed opening brackets and we are still
-  " in them, find the rightmost one and add indent depending on the bracket
-  " type.
-  "
-  " If it contained hanging closing brackets, find the rightmost one, find its
-  " match and indent according to that.
-  if line =~ '[[({]' || line =~ '[])}]\s*\%(#.*\)\=$'
-    let [opening, closing] = s:ExtraBrackets(lnum)
-
-    if opening.pos != -1
-      if opening.type == '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
-        if col('.') + 1 == col('$')
-          return ind + sw
-        else
-          return virtcol('.')
-        endif
-      else
-        let nonspace = matchend(line, '\S', opening.pos + 1) - 1
-        return nonspace > 0 ? nonspace : ind + sw
-      endif
-    elseif closing.pos != -1
-      call cursor(lnum, closing.pos + 1)
-      normal! %
-
-      if s:Match(line('.'), s:ruby_indent_keywords)
-        return indent('.') + sw
-      else
-        return indent(s:GetMSL(line('.')))
-      endif
-    else
-      call cursor(clnum, vcol)
-    end
-  endif
-
-  " If the previous line ended with an "end", match that "end"s beginning's
-  " indent.
-  let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
-  if col > 0
-    call cursor(lnum, col)
-    if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
-          \ s:end_skip_expr) > 0
-      let n = line('.')
-      let ind = indent('.')
-      let msl = s:GetMSL(n)
-      if msl != n
-        let ind = indent(msl)
-      end
-      return ind
-    endif
-  end
-
-  let col = s:Match(lnum, s:ruby_indent_keywords)
-  if col > 0
-    call cursor(lnum, col)
-    let ind = virtcol('.') - 1 + sw
-    " TODO: make this better (we need to count them) (or, if a searchpair
-    " fails, we know that something is lacking an end and thus we indent a
-    " level
-    if s:Match(lnum, s:end_end_regex)
-      let ind = indent('.')
-    endif
-    return ind
-  endif
-
-  " 3.4. Work on the MSL line. {{{2
-  " --------------------------
-
-  " Set up variables to use and search for MSL to the previous line.
-  let p_lnum = lnum
-  let lnum = s:GetMSL(lnum)
-
-  " If the previous line wasn't a MSL.
-  if p_lnum != lnum
-    " If previous line ends bracket and begins non-bracket continuation decrease indent by 1.
-    if s:Match(p_lnum, s:bracket_switch_continuation_regex)
-      return ind - 1
-    " If previous line is a continuation return its indent.
-    " TODO: the || s:IsInString() thing worries me a bit.
-    elseif s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
-      return ind
-    endif
-  endif
-
-  " Set up more variables, now that we know we wasn't continuation bound.
-  let line = getline(lnum)
-  let msl_ind = indent(lnum)
-
-  " If the MSL line had an indenting keyword in it, add a level of indent.
-  " TODO: this does not take into account contrived things such as
-  " module Foo; class Bar; end
-  if s:Match(lnum, s:ruby_indent_keywords)
-    let ind = msl_ind + sw
-    if s:Match(lnum, s:end_end_regex)
-      let ind = ind - sw
-    endif
-    return ind
-  endif
-
-  " If the previous line ended with [*+/.,-=], but wasn't a block ending or a
-  " closing bracket, indent one extra level.
-  if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)')
-    if lnum == p_lnum
-      let ind = msl_ind + sw
-    else
-      let ind = msl_ind
-    endif
-    return ind
-  endif
-
-  " }}}2
-
-  return ind
-endfunction
-
 " }}}1
 
 let &cpo = s:cpo_save