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+" Vim indent file
+" Language: TypeScript
+" Maintainer: See https://github.com/HerringtonDarkholme/yats.vim
+" Last Change: 2019 Jun 06
+" Acknowledgement: Based off of vim-ruby maintained by Nikolai Weibull http://vim-ruby.rubyforge.org
+
+" 0. Initialization {{{1
+" =================
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+setlocal nosmartindent
+
+" Now, set up our indentation expression and keys that trigger it.
+setlocal indentexpr=GetTypescriptIndent()
+setlocal formatexpr=Fixedgq(v:lnum,v:count)
+setlocal indentkeys=0{,0},0),0],0\,,!^F,o,O,e
+
+" Only define the function once.
+if exists("*GetTypescriptIndent")
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" 1. Variables {{{1
+" ============
+
+let s:js_keywords = '^\s*\(break\|case\|catch\|continue\|debugger\|default\|delete\|do\|else\|finally\|for\|function\|if\|in\|instanceof\|new\|return\|switch\|this\|throw\|try\|typeof\|var\|void\|while\|with\)'
+
+" Regex of syntax group names that are or delimit string or are comments.
+let s:syng_strcom = 'string\|regex\|comment\c'
+
+" Regex of syntax group names that are strings.
+let s:syng_string = 'regex\c'
+
+" Regex of syntax group names that are strings or documentation.
+let s:syng_multiline = 'comment\c'
+
+" Regex of syntax group names that are line comment.
+let s:syng_linecom = 'linecomment\c'
+
+" 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."'"
+
+let s:line_term = '\s*\%(\%(\/\/\).*\)\=$'
+
+" Regex that defines continuation lines, not including (, {, or [.
+let s:continuation_regex = '\%([\\*+/.:]\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\|[^=]=[^=].*,\)' . s:line_term
+
+" Regex that defines continuation lines.
+" TODO: this needs to deal with if ...: and so on
+let s:msl_regex = s:continuation_regex
+
+let s:one_line_scope_regex = '\<\%(if\|else\|for\|while\)\>[^{;]*' . s:line_term
+
+" Regex that defines blocks.
+let s:block_regex = '\%([{[]\)\s*\%(|\%([*@]\=\h\w*,\=\s*\)\%(,\s*[*@]\=\h\w*\)*|\)\=' . s:line_term
+
+let s:var_stmt = '^\s*var'
+
+let s:comma_first = '^\s*,'
+let s:comma_last = ',\s*$'
+
+let s:ternary = '^\s\+[?|:]'
+let s:ternary_q = '^\s\+?'
+
+" 2. Auxiliary Functions {{{1
+" ======================
+
+" 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
+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
+endfunction
+
+" Check if the character at lnum:col is inside a multi-line comment.
+function s:IsInMultilineComment(lnum, col)
+  return !s:IsLineComment(a:lnum, a:col) && synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_multiline
+endfunction
+
+" Check if the character at lnum:col is a line comment.
+function s:IsLineComment(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_linecom
+endfunction
+
+" Find line above 'lnum' that isn't empty, in a comment, or in a string.
+function s:PrevNonBlankNonString(lnum)
+  let in_block = 0
+  let lnum = prevnonblank(a:lnum)
+  while lnum > 0
+    " Go in and out of blocks comments as necessary.
+    " If the line isn't empty (with opt. comment) or in a string, end search.
+    let line = getline(lnum)
+    if line =~ '/\*'
+      if in_block
+        let in_block = 0
+      else
+        break
+      endif
+    elseif !in_block && line =~ '\*/'
+      let in_block = 1
+    elseif !in_block && line !~ '^\s*\%(//\).*$' && !(s:IsInStringOrComment(lnum, 1) && s:IsInStringOrComment(lnum, strlen(line)))
+      break
+    endif
+    let lnum = prevnonblank(lnum - 1)
+  endwhile
+  return lnum
+endfunction
+
+" Find line above 'lnum' that started the continuation 'lnum' may be part of.
+function s:GetMSL(lnum, in_one_line_scope)
+  " Start on the line we're at and use its indent.
+  let msl = a:lnum
+  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.
+    " Otherwise, terminate search as we have found our MSL already.
+    let line = getline(lnum)
+    let col = match(line, s:msl_regex) + 1
+    if (col > 0 && !s:IsInStringOrComment(lnum, col)) || s:IsInString(lnum, strlen(line))
+      let msl = lnum
+    else
+      " Don't use lines that are part of a one line scope as msl unless the
+      " flag in_one_line_scope is set to 1
+      "
+      if a:in_one_line_scope
+        break
+      end
+      let msl_one_line = s:Match(lnum, s:one_line_scope_regex)
+      if msl_one_line == 0
+        break
+      endif
+    endif
+    let lnum = s:PrevNonBlankNonString(lnum - 1)
+  endwhile
+  return msl
+endfunction
+
+function s:RemoveTrailingComments(content)
+  let single = '\/\/\(.*\)\s*$'
+  let multi = '\/\*\(.*\)\*\/\s*$'
+  return substitute(substitute(a:content, single, '', ''), multi, '', '')
+endfunction
+
+" Find if the string is inside var statement (but not the first string)
+function s:InMultiVarStatement(lnum)
+  let lnum = s:PrevNonBlankNonString(a:lnum - 1)
+
+"  let type = synIDattr(synID(lnum, indent(lnum) + 1, 0), 'name')
+
+  " loop through previous expressions to find a var statement
+  while lnum > 0
+    let line = getline(lnum)
+
+    " if the line is a js keyword
+    if (line =~ s:js_keywords)
+      " check if the line is a var stmt
+      " if the line has a comma first or comma last then we can assume that we
+      " are in a multiple var statement
+      if (line =~ s:var_stmt)
+        return lnum
+      endif
+
+      " other js keywords, not a var
+      return 0
+    endif
+
+    let lnum = s:PrevNonBlankNonString(lnum - 1)
+  endwhile
+
+  " beginning of program, not a var
+  return 0
+endfunction
+
+" Find line above with beginning of the var statement or returns 0 if it's not
+" this statement
+function s:GetVarIndent(lnum)
+  let lvar = s:InMultiVarStatement(a:lnum)
+  let prev_lnum = s:PrevNonBlankNonString(a:lnum - 1)
+
+  if lvar
+    let line = s:RemoveTrailingComments(getline(prev_lnum))
+
+    " if the previous line doesn't end in a comma, return to regular indent
+    if (line !~ s:comma_last)
+      return indent(prev_lnum) - shiftwidth()
+    else
+      return indent(lvar) + shiftwidth()
+    endif
+  endif
+
+  return -1
+endfunction
+
+
+" Check if line 'lnum' has more opening brackets than closing ones.
+function s:LineHasOpeningBrackets(lnum)
+  let open_0 = 0
+  let open_2 = 0
+  let open_4 = 0
+  let line = getline(a:lnum)
+  let pos = match(line, '[][(){}]', 0)
+  while pos != -1
+    if !s:IsInStringOrComment(a:lnum, pos + 1)
+      let idx = stridx('(){}[]', line[pos])
+      if idx % 2 == 0
+        let open_{idx} = open_{idx} + 1
+      else
+        let open_{idx - 1} = open_{idx - 1} - 1
+      endif
+    endif
+    let pos = match(line, '[][(){}]', pos + 1)
+  endwhile
+  return (open_0 > 0) . (open_2 > 0) . (open_4 > 0)
+endfunction
+
+function s:Match(lnum, regex)
+  let col = match(getline(a:lnum), a:regex) + 1
+  return col > 0 && !s:IsInStringOrComment(a:lnum, col) ? col : 0
+endfunction
+
+function s:IndentWithContinuation(lnum, ind, width)
+  " Set up variables to use and search for MSL to the previous line.
+  let p_lnum = a:lnum
+  let lnum = s:GetMSL(a:lnum, 1)
+  let line = getline(lnum)
+
+  " If the previous line wasn't a MSL and is continuation return its indent.
+  " TODO: the || s:IsInString() thing worries me a bit.
+  if p_lnum != lnum
+    if s:Match(p_lnum,s:continuation_regex)||s:IsInString(p_lnum,strlen(line))
+      return a:ind
+    endif
+  endif
+
+  " Set up more variables now that we know we aren't continuation bound.
+  let msl_ind = indent(lnum)
+
+  " If the previous line ended with [*+/.-=], start a continuation that
+  " indents an extra level.
+  if s:Match(lnum, s:continuation_regex)
+    if lnum == p_lnum
+      return msl_ind + a:width
+    else
+      return msl_ind
+    endif
+  endif
+
+  return a:ind
+endfunction
+
+function s:InOneLineScope(lnum)
+  let msl = s:GetMSL(a:lnum, 1)
+  if msl > 0 && s:Match(msl, s:one_line_scope_regex)
+    return msl
+  endif
+  return 0
+endfunction
+
+function s:ExitingOneLineScope(lnum)
+  let msl = s:GetMSL(a:lnum, 1)
+  if msl > 0
+    " if the current line is in a one line scope ..
+    if s:Match(msl, s:one_line_scope_regex)
+      return 0
+    else
+      let prev_msl = s:GetMSL(msl - 1, 1)
+      if s:Match(prev_msl, s:one_line_scope_regex)
+        return prev_msl
+      endif
+    endif
+  endif
+  return 0
+endfunction
+
+" 3. GetTypescriptIndent Function {{{1
+" =========================
+
+function GetTypescriptIndent()
+  " 3.1. Setup {{{2
+  " ----------
+
+  " Set up variables for restoring position in file.  Could use v:lnum here.
+  let vcol = col('.')
+
+  " 3.2. Work on the current line {{{2
+  " -----------------------------
+
+  let ind = -1
+  " Get the current line.
+  let line = getline(v:lnum)
+  " previous nonblank line number
+  let prevline = prevnonblank(v:lnum - 1)
+
+  " 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(v:lnum, col)
+    call cursor(v:lnum, col)
+
+    let lvar = s:InMultiVarStatement(v:lnum)
+    if lvar
+      let prevline_contents = s:RemoveTrailingComments(getline(prevline))
+
+      " check for comma first
+      if (line[col - 1] =~ ',')
+        " if the previous line ends in comma or semicolon don't indent
+        if (prevline_contents =~ '[;,]\s*$')
+          return indent(s:GetMSL(line('.'), 0))
+        " get previous line indent, if it's comma first return prevline indent
+        elseif (prevline_contents =~ s:comma_first)
+          return indent(prevline)
+        " otherwise we indent 1 level
+        else
+          return indent(lvar) + shiftwidth()
+        endif
+      endif
+    endif
+
+
+    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('$') - 1
+        let ind = virtcol('.')-1
+      else
+        let ind = indent(s:GetMSL(line('.'), 0))
+      endif
+    endif
+    return ind
+  endif
+
+  " If the line is comma first, dedent 1 level
+  if (getline(prevline) =~ s:comma_first)
+    return indent(prevline) - shiftwidth()
+  endif
+
+  if (line =~ s:ternary)
+    if (getline(prevline) =~ s:ternary_q)
+      return indent(prevline)
+    else
+      return indent(prevline) + shiftwidth()
+    endif
+  endif
+
+  " If we are in a multi-line comment, cindent does the right thing.
+  if s:IsInMultilineComment(v:lnum, 1) && !s:IsLineComment(v:lnum, 1)
+    return cindent(v:lnum)
+  endif
+
+  " Check for multiple var assignments
+"  let var_indent = s:GetVarIndent(v:lnum)
+"  if var_indent >= 0
+"    return var_indent
+"  endif
+
+  " 3.3. Work on the previous line. {{{2
+  " -------------------------------
+
+  " If the line is empty and the previous nonblank line was a multi-line
+  " comment, use that comment's indent. Deduct one char to account for the
+  " space in ' */'.
+  if line =~ '^\s*$' && s:IsInMultilineComment(prevline, 1)
+    return indent(prevline) - 1
+  endif
+
+  " Find a non-blank, non-multi-line string line above the current line.
+  let lnum = s:PrevNonBlankNonString(v:lnum - 1)
+
+  " If the line is empty and inside a string, use the previous line.
+  if line =~ '^\s*$' && lnum != prevline
+    return indent(prevnonblank(v:lnum))
+  endif
+
+  " At the start of the file use zero indent.
+  if lnum == 0
+    return 0
+  endif
+
+  " Set up variables for current line.
+  let line = getline(lnum)
+  let ind = indent(lnum)
+
+  " If the previous line ended with a block opening, add a level of indent.
+  if s:Match(lnum, s:block_regex)
+    return indent(s:GetMSL(lnum, 0)) + shiftwidth()
+  endif
+
+  " If the previous line contained an opening bracket, and we are still in it,
+  " add indent depending on the bracket type.
+  if line =~ '[[({]'
+    let counts = s:LineHasOpeningBrackets(lnum)
+    if counts[0] == '1' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
+      if col('.') + 1 == col('$')
+        return ind + shiftwidth()
+      else
+        return virtcol('.')
+      endif
+    elseif counts[1] == '1' || counts[2] == '1'
+      return ind + shiftwidth()
+    else
+      call cursor(v:lnum, vcol)
+    end
+  endif
+
+  " 3.4. Work on the MSL line. {{{2
+  " --------------------------
+
+  let ind_con = ind
+  let ind = s:IndentWithContinuation(lnum, ind_con, shiftwidth())
+
+  " }}}2
+  "
+  "
+  let ols = s:InOneLineScope(lnum)
+  if ols > 0
+    let ind = ind + shiftwidth()
+  else
+    let ols = s:ExitingOneLineScope(lnum)
+    while ols > 0 && ind > 0
+      let ind = ind - shiftwidth()
+      let ols = s:InOneLineScope(ols - 1)
+    endwhile
+  endif
+
+  return ind
+endfunction
+
+" }}}1
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+function! Fixedgq(lnum, count)
+    let l:tw = &tw ? &tw : 80;
+
+    let l:count = a:count
+    let l:first_char = indent(a:lnum) + 1
+
+    if mode() == 'i' " gq was not pressed, but tw was set
+        return 1
+    endif
+
+    " This gq is only meant to do code with strings, not comments
+    if s:IsLineComment(a:lnum, l:first_char) || s:IsInMultilineComment(a:lnum, l:first_char)
+        return 1
+    endif
+
+    if len(getline(a:lnum)) < l:tw && l:count == 1 " No need for gq
+        return 1
+    endif
+
+    " Put all the lines on one line and do normal spliting after that
+    if l:count > 1
+        while l:count > 1
+            let l:count -= 1
+            normal J
+        endwhile
+    endif
+
+    let l:winview = winsaveview()
+
+    call cursor(a:lnum, l:tw + 1)
+    let orig_breakpoint = searchpairpos(' ', '', '\.', 'bcW', '', a:lnum)
+    call cursor(a:lnum, l:tw + 1)
+    let breakpoint = searchpairpos(' ', '', '\.', 'bcW', s:skip_expr, a:lnum)
+
+    " No need for special treatment, normal gq handles edgecases better
+    if breakpoint[1] == orig_breakpoint[1]
+        call winrestview(l:winview)
+        return 1
+    endif
+
+    " Try breaking after string
+    if breakpoint[1] <= indent(a:lnum)
+        call cursor(a:lnum, l:tw + 1)
+        let breakpoint = searchpairpos('\.', '', ' ', 'cW', s:skip_expr, a:lnum)
+    endif
+
+
+    if breakpoint[1] != 0
+        call feedkeys("r\<CR>")
+    else
+        let l:count = l:count - 1
+    endif
+
+    " run gq on new lines
+    if l:count == 1
+        call feedkeys("gqq")
+    endif
+
+    return 0
+endfunction