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+" ABB Rapid Command indent file for Vim
+" Language: ABB Rapid Command
+" Maintainer: Patrick Meiser-Knosowski <knosowski@graeffrobotics.de>
+" Version: 2.2.7
+" Last Change: 12. May 2023
+" Credits: Based on indent/vim.vim
+"
+" Suggestions of improvement are very welcome. Please email me!
+"
+" Known bugs: ../doc/rapid.txt
+"
+" TODO
+" * indent wrapped lines which do not end with an ; or special key word,
+"     maybe this is a better idea, but then () and [] has to be changed as
+"     well
+"
+
+if exists("g:rapidNoSpaceIndent")
+  if !exists("g:rapidSpaceIndent")
+    let g:rapidSpaceIndent = !g:rapidNoSpaceIndent
+  endif
+  unlet g:rapidNoSpaceIndent
+endif
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent") || get(g:,'rapidNoIndent',0)
+  finish
+endif
+let b:did_indent = 1
+
+setlocal nolisp
+setlocal nosmartindent
+setlocal autoindent
+setlocal indentexpr=GetRapidIndent()
+if get(g:,'rapidNewStyleIndent',0)
+  setlocal indentkeys=!^F,o,O,0=~endmodule,0=~error,0=~undo,0=~backward,0=~endproc,0=~endrecord,0=~endtrap,0=~endfunc,0=~else,0=~endif,0=~endtest,0=~endfor,0=~endwhile,:,<[>,<]>,<(>,<)>
+else
+  setlocal indentkeys=!^F,o,O,0=~endmodule,0=~error,0=~undo,0=~backward,0=~endproc,0=~endrecord,0=~endtrap,0=~endfunc,0=~else,0=~endif,0=~endtest,0=~endfor,0=~endwhile,:
+endif
+let b:undo_indent="setlocal lisp< si< ai< inde< indk<"
+
+if get(g:,'rapidSpaceIndent',1)
+  " Use spaces for indention, 2 is enough. 
+  " More or even tabs wastes space on the teach pendant.
+  setlocal softtabstop=2
+  setlocal shiftwidth=2
+  setlocal expandtab
+  setlocal shiftround
+  let b:undo_indent = b:undo_indent." sts< sw< et< sr<"
+endif
+
+" Only define the function once.
+if exists("*GetRapidIndent")
+  finish
+endif
+
+let s:keepcpo= &cpo
+set cpo&vim
+
+function GetRapidIndent()
+  let ignorecase_save = &ignorecase
+  try
+    let &ignorecase = 0
+    return s:GetRapidIndentIntern()
+  finally
+    let &ignorecase = ignorecase_save
+  endtry
+endfunction
+
+function s:GetRapidIndentIntern() abort
+
+  let l:currentLineNum = v:lnum
+  let l:currentLine = getline(l:currentLineNum)
+
+  if  l:currentLine =~ '^!' && !get(g:,'rapidCommentIndent',0)
+    " If current line is ! line comment, do not change indent
+    " This may be usefull if code is commented out at the first column.
+    return 0
+  endif
+
+  " Find a non-blank line above the current line.
+  let l:preNoneBlankLineNum = s:RapidPreNoneBlank(v:lnum - 1)
+  if  l:preNoneBlankLineNum == 0
+    " At the start of the file use zero indent.
+    return 0
+  endif
+
+  let l:preNoneBlankLine = getline(l:preNoneBlankLineNum)
+  let l:ind = indent(l:preNoneBlankLineNum)
+
+  " Define add a 'shiftwidth' pattern
+  let l:addShiftwidthPattern  = '\c\v^\s*('
+  let l:addShiftwidthPattern .=           '((local|task)\s+)?(module|record|proc|func|trap)\s+\k'
+  let l:addShiftwidthPattern .=           '|(backward|error|undo)>'
+  let l:addShiftwidthPattern .=         ')'
+  "
+  " Define Subtract 'shiftwidth' pattern
+  let l:subtractShiftwidthPattern  = '\c\v^\s*('
+  let l:subtractShiftwidthPattern .=           'end(module|record|proc|func|trap)>'
+  let l:subtractShiftwidthPattern .=           '|(backward|error|undo)>'
+  let l:subtractShiftwidthPattern .=         ')'
+
+  " Add shiftwidth
+  if l:preNoneBlankLine =~ l:addShiftwidthPattern
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "then",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "else",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "do",       0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "case",     0)>=0
+        \|| s:RapidLenTilStr(l:preNoneBlankLineNum, "default",  0)>=0
+    let l:ind += &sw
+  endif
+
+  " Subtract shiftwidth
+  if l:currentLine =~ l:subtractShiftwidthPattern
+        \|| s:RapidLenTilStr(l:currentLineNum, "endif",     0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endfor",    0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endwhile",  0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "endtest",   0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "else",      0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "elseif",    0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "case",      0)>=0
+        \|| s:RapidLenTilStr(l:currentLineNum, "default",   0)>=0
+    let l:ind = l:ind - &sw
+  endif
+
+  " First case (or default) after a test gets the indent of the test.
+  if (s:RapidLenTilStr(l:currentLineNum, "case", 0)>=0 || s:RapidLenTilStr(l:currentLineNum, "default", 0)>=0) && s:RapidLenTilStr(l:preNoneBlankLineNum, "test", 0)>=0
+    let l:ind += &sw
+  endif
+
+  " continued lines with () or []
+  let l:OpenSum  = s:RapidLoneParen(l:preNoneBlankLineNum,"(") + s:RapidLoneParen(l:preNoneBlankLineNum,"[")
+  if get(g:,'rapidNewStyleIndent',0)
+    let l:CloseSum = s:RapidLoneParen(l:preNoneBlankLineNum,")") + s:RapidLoneParen(l:currentLineNum,"]")
+  else
+    let l:CloseSum = s:RapidLoneParen(l:preNoneBlankLineNum,")") + s:RapidLoneParen(l:preNoneBlankLineNum,"]")
+  endif
+  if l:OpenSum > l:CloseSum
+    let l:ind += (l:OpenSum * 4 * &sw)
+  elseif l:OpenSum < l:CloseSum
+    let l:ind -= (l:CloseSum * 4 * &sw)
+  endif
+
+  return l:ind
+endfunction
+
+" Returns the length of the line until a:str occur outside a string or
+" comment. Search starts at string index a:startIdx.
+" If a:str is a word also add word bounderies and case insesitivity.
+" Note: rapidTodoComment and rapidDebugComment are not taken into account.
+function s:RapidLenTilStr(lnum, str, startIdx) abort
+
+  let l:line = getline(a:lnum)
+  let l:len  = strlen(l:line)
+  let l:idx  = a:startIdx
+  let l:str  = a:str
+  if l:str =~ '^\k\+$'
+    let l:str = '\c\<' . l:str . '\>'
+  endif
+
+  while l:len > l:idx
+    let l:idx = match(l:line, l:str, l:idx)
+    if l:idx < 0
+      " a:str not found
+      return -1
+    endif
+    let l:synName = synIDattr(synID(a:lnum,l:idx+1,0),"name")
+    if         l:synName != "rapidString"
+          \&&  l:synName != "rapidConcealableString"
+          \&& (l:synName != "rapidComment" || l:str =~ '^!')
+      " a:str found outside string or line comment
+      return l:idx
+    endif
+    " a:str is part of string or line comment
+    let l:idx += 1 " continue search for a:str
+  endwhile
+  
+  " a:str not found or l:len <= a:startIdx
+  return -1
+endfunction
+
+" a:lchar shoud be one of (, ), [, ], { or }
+" returns the number of opening/closing parenthesise which have no
+" closing/opening match in getline(a:lnum)
+function s:RapidLoneParen(lnum,lchar) abort
+  if a:lchar == "(" || a:lchar == ")"
+    let l:opnParChar = "("
+    let l:clsParChar = ")"
+  elseif a:lchar == "[" || a:lchar == "]"
+    let l:opnParChar = "["
+    let l:clsParChar = "]"
+  elseif a:lchar == "{" || a:lchar == "}"
+    let l:opnParChar = "{"
+    let l:clsParChar = "}"
+  else
+    return 0
+  endif
+
+  let l:line = getline(a:lnum)
+
+  " look for the first ! which is not part of a string 
+  let l:len = s:RapidLenTilStr(a:lnum,"!",0)
+  if l:len == 0
+    return 0 " first char is !; ignored
+  endif
+
+  let l:opnParen = 0
+  " count opening brakets
+  let l:i = 0
+  while l:i >= 0
+    let l:i = s:RapidLenTilStr(a:lnum, l:opnParChar, l:i)
+    if l:i >= 0
+      let l:opnParen += 1
+      let l:i += 1
+    endif
+  endwhile
+
+  let l:clsParen = 0
+  " count closing brakets
+  let l:i = 0
+  while l:i >= 0
+    let l:i = s:RapidLenTilStr(a:lnum, l:clsParChar, l:i)
+    if l:i >= 0
+      let l:clsParen += 1
+      let l:i += 1
+    endif
+  endwhile
+
+  if (a:lchar == "(" || a:lchar == "[" || a:lchar == "{") && l:opnParen>l:clsParen
+    return (l:opnParen-l:clsParen)
+  elseif (a:lchar == ")" || a:lchar == "]" || a:lchar == "}") && l:clsParen>l:opnParen
+    return (l:clsParen-l:opnParen)
+  endif
+
+  return 0
+endfunction
+
+" This function works almost like prevnonblank() but handles %%%-headers and
+" comments like blank lines
+function s:RapidPreNoneBlank(lnum) abort
+
+  let nPreNoneBlank = prevnonblank(a:lnum)
+
+  while nPreNoneBlank>0 && getline(nPreNoneBlank) =~ '\v\c^\s*(\%\%\%|!)'
+    " Previouse none blank line irrelevant. Look further aback.
+    let nPreNoneBlank = prevnonblank(nPreNoneBlank - 1)
+  endwhile
+
+  return nPreNoneBlank
+endfunction
+
+let &cpo = s:keepcpo
+unlet s:keepcpo
+
+" vim:sw=2 sts=2 et