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+" Tabular:     Align columnar data using regex-designated column boundaries
+" Maintainer:  Matthew Wozniski (mjw@drexel.edu)
+" Date:        Thu, 11 Oct 2007 00:35:34 -0400
+" Version:     0.1
+
+" Stupid vimscript crap                                                   {{{1
+let s:savecpo = &cpo
+set cpo&vim
+
+" Private Functions                                                       {{{1
+
+" Return the number of bytes in a string after expanding tabs to spaces.  {{{2
+" This expansion is done based on the current value of 'tabstop'
+function! s:Strlen(string)
+  let rv = 0
+  let i = 0
+
+  for char in split(a:string, '\zs')
+    if char == "\t"
+      let rv += &ts - i
+      let i = 0
+    else
+      let rv += 1
+      let i = (i + 1) % &ts
+    endif
+  endfor
+
+  return rv
+endfunction
+
+" Align a string within a field                                           {{{2
+" These functions do not trim leading and trailing spaces.
+
+" Right align 'string' in a field of size 'fieldwidth'
+function! s:Right(string, fieldwidth)
+  let spaces = a:fieldwidth - s:Strlen(a:string)
+  return matchstr(a:string, '^\s*') . repeat(" ", spaces) . substitute(a:string, '^\s*', '', '')
+endfunction
+
+" Left align 'string' in a field of size 'fieldwidth'
+function! s:Left(string, fieldwidth)
+  let spaces = a:fieldwidth - s:Strlen(a:string)
+  return a:string . repeat(" ", spaces)
+endfunction
+
+" Center align 'string' in a field of size 'fieldwidth'
+function! s:Center(string, fieldwidth)
+  let spaces = a:fieldwidth - s:Strlen(a:string)
+  let right = spaces / 2
+  let left = right + (right * 2 != spaces)
+  return repeat(" ", left) . a:string . repeat(" ", right)
+endfunction
+
+" Remove spaces around a string                                           {{{2
+
+" Remove all trailing spaces from a string.
+function! s:StripTrailingSpaces(string)
+  return matchstr(a:string, '^.\{-}\ze\s*$')
+endfunction
+
+" Remove all leading spaces from a string.
+function! s:StripLeadingSpaces(string)
+  return matchstr(a:string, '^\s*\zs.*$')
+endfunction
+
+" Split a string into fields and delimiters                               {{{2
+" Like split(), but include the delimiters as elements
+" All odd numbered elements are delimiters
+" All even numbered elements are non-delimiters (including zero)
+function! s:SplitDelim(string, delim)
+  let rv = []
+  let beg = 0
+  let idx = 0
+
+  let len = len(a:string)
+
+  while 1
+    let mid = match(a:string, a:delim, beg, 1)
+    if mid == -1 || mid == len
+      break
+    endif
+
+    let matchstr = matchstr(a:string, a:delim, beg, 1)
+    let length = strlen(matchstr)
+
+    if beg < mid
+      let rv += [ a:string[beg : mid-1] ]
+    else
+      let rv += [ "" ]
+    endif
+
+    let beg = mid + length
+    let idx = beg
+
+    if beg == mid
+      " Empty match, advance "beg" by one to avoid infinite loop
+      let rv += [ "" ]
+      let beg += 1
+    else " beg > mid
+      let rv += [ a:string[mid : beg-1] ]
+    endif
+  endwhile
+
+  let rv += [ strpart(a:string, idx) ]
+
+  return rv
+endfunction
+
+" Replace lines from `start' to `start + len - 1' with the given strings. {{{2
+" If more lines are needed to show all strings, they will be added.
+" If there are too few strings to fill all lines, lines will be removed.
+function! s:SetLines(start, len, strings)
+  if a:start > line('$') + 1 || a:start < 1
+    throw "Invalid start line!"
+  endif
+
+  if len(a:strings) > a:len
+    let fensave = &fen
+    let view = winsaveview()
+    call append(a:start + a:len - 1, repeat([''], len(a:strings) - a:len))
+    call winrestview(view)
+    let &fen = fensave
+  elseif len(a:strings) < a:len
+    let fensave = &fen
+    let view = winsaveview()
+    sil exe (a:start + len(a:strings)) . ',' .  (a:start + a:len - 1) . 'd_'
+    call winrestview(view)
+    let &fen = fensave
+  endif
+
+  call setline(a:start, a:strings)
+endfunction
+
+" Runs the given commandstring argument as an expression.                 {{{2
+" The commandstring expression is expected to reference the a:lines argument.
+" If the commandstring expression returns a list the items of that list will
+" replace the items in a:lines, otherwise the expression is assumed to have
+" modified a:lines itself.
+function! s:FilterString(lines, commandstring)
+  exe 'let rv = ' . a:commandstring
+
+  if type(rv) == type(a:lines) && rv isnot a:lines
+    call filter(a:lines, 0)
+    call extend(a:lines, rv)
+  endif
+endfunction
+
+" Public API                                                              {{{1
+
+if !exists("g:tabular_default_format")
+  let g:tabular_default_format = "l1"
+endif
+
+let s:formatelempat = '\%([lrc]\d\+\)'
+
+function! tabular#ElementFormatPattern()
+  return s:formatelempat
+endfunction
+
+" Given a list of strings and a delimiter, split each string on every
+" occurrence of the delimiter pattern, format each element according to either
+" the provided format (optional) or the default format, and join them back
+" together with enough space padding to guarantee that the nth delimiter of
+" each string is aligned.
+function! tabular#TabularizeStrings(strings, delim, ...)
+  if a:0 > 1
+    echoerr "TabularizeStrings accepts only 2 or 3 arguments (got ".(a:0+2).")"
+    return 1
+  endif
+
+  let formatstr = (a:0 ? a:1 : g:tabular_default_format)
+
+  if formatstr !~? s:formatelempat . '\+'
+    echoerr "Tabular: Invalid format \"" . formatstr . "\" specified!"
+    return 1
+  endif
+
+  let format = split(formatstr, s:formatelempat . '\zs')
+
+  let lines = map(a:strings, 's:SplitDelim(v:val, a:delim)')
+
+  " Strip spaces
+  "   - Only from non-delimiters; spaces in delimiters must have been matched
+  "     intentionally
+  "   - Don't strip leading spaces from the first element; we like indenting.
+  for line in lines
+    if line[0] !~ '^\s*$'
+      let line[0] = s:StripTrailingSpaces(line[0])
+    endif
+    if len(line) >= 3
+      for i in range(2, len(line)-1, 2)
+        let line[i] = s:StripLeadingSpaces(s:StripTrailingSpaces(line[i]))
+      endfor
+    endif
+  endfor
+
+  " Find the max length of each field
+  let maxes = []
+  for line in lines
+    for i in range(len(line))
+      if i == len(maxes)
+        let maxes += [ s:Strlen(line[i]) ]
+      else
+        let maxes[i] = max( [ maxes[i], s:Strlen(line[i]) ] )
+      endif
+    endfor
+  endfor
+
+  let lead_blank = empty(filter(copy(lines), 'v:val[0] =~ "\\S"'))
+
+  " Concatenate the fields, according to the format pattern.
+  for idx in range(len(lines))
+    let line = lines[idx]
+    for i in range(len(line))
+      let how = format[i % len(format)][0]
+      let pad = format[i % len(format)][1:-1]
+
+      if how =~? 'l'
+        let field = s:Left(line[i], maxes[i])
+      elseif how =~? 'r'
+        let field = s:Right(line[i], maxes[i])
+      elseif how =~? 'c'
+        let field = s:Center(line[i], maxes[i])
+      endif
+
+      let line[i] = field . (lead_blank && i == 0 ? '' : repeat(" ", pad))
+    endfor
+
+    let lines[idx] = s:StripTrailingSpaces(join(line, ''))
+  endfor
+endfunction
+
+" Apply 0 or more filters, in sequence, to selected text in the buffer    {{{2
+" The lines to be filtered are determined as follows:
+"   If the function is called with a range containing multiple lines, then
+"     those lines will be used as the range.
+"   If the function is called with no range or with a range of 1 line, then
+"     if "includepat" is not specified,
+"       that 1 line will be filtered,
+"     if "includepat" is specified and that line does not match it,
+"       no lines will be filtered
+"     if "includepat" is specified and that line does match it,
+"       all contiguous lines above and below the specified line matching the
+"       pattern will be filtered.
+"
+" The remaining arguments must each be a filter to apply to the text.
+" Each filter must either be a String evaluating to a function to be called.
+function! tabular#PipeRange(includepat, ...) range
+  let top = a:firstline
+  let bot = a:lastline
+
+  if a:includepat != '' && top == bot
+    if top < 0 || top > line('$') || getline(top) !~ a:includepat
+      return
+    endif
+    while top > 1 && getline(top-1) =~ a:includepat
+      let top -= 1
+    endwhile
+    while bot < line('$') && getline(bot+1) =~ a:includepat
+      let bot += 1
+    endwhile
+  endif
+
+  let lines = map(range(top, bot), 'getline(v:val)')
+
+  for filter in a:000
+    if type(filter) != type("")
+      echoerr "PipeRange: Bad filter: " . string(filter)
+    endif
+
+    call s:FilterString(lines, filter)
+
+    unlet filter
+  endfor
+
+  call s:SetLines(top, bot - top + 1, lines)
+endfunction
+
+" Stupid vimscript crap, part 2                                           {{{1
+let &cpo = s:savecpo
+unlet s:savecpo
+
+" vim:set sw=2 sts=2 fdm=marker: