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+" Vim indent file
+" Language: Autoconf configure.{ac,in} file
+" Maintainer: Nikolai Weibull <source@pcppopper.org>
+" URL: http://www.pcppopper.org/vim/indent/pcp/config/
+" Latest Revision: 2004-04-25
+" arch-tag: 7779c341-796f-408e-80e4-a55c26b519a4
+" TODO: how about nested [()]'s in one line
+" what's wrong with '\\\@!'?
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+ finish
+endif
+
+source <sfile>:p:h/sh.vim " will set b:did_indent
+
+setlocal indentexpr=GetConfigIndent()
+setlocal indentkeys=!^F,o,O,=then,=do,=else,=elif,=esac,=fi,=fin,=fil,=done
+
+" Only define the function once.
+if exists("*GetConfigIndent")
+ finish
+endif
+
+" get the offset (indent) of the end of the match of 'regexp' in 'line'
+function s:GetOffsetOf(line, regexp)
+ let end = matchend(a:line, a:regexp)
+ let width = 0
+ let i = 0
+ while i < end
+ if a:line[i] != "\t"
+ let width = width + 1
+ else
+ let width = width + &ts - (width % &ts)
+ endif
+ let i = i + 1
+ endwhile
+ return width
+endfunction
+
+function GetConfigIndent()
+ " Find a non-blank line above the current line.
+ let lnum = prevnonblank(v:lnum - 1)
+
+ " Hit the start of the file, use zero indent.
+ if lnum == 0
+ return 0
+ endif
+
+ " where to put this
+ let ind = GetShIndent()
+ let line = getline(lnum)
+
+ " if previous line has unmatched, unescaped opening parentheses,
+ " indent to its position. TODO: not failsafe if multiple ('s
+ if line =~ '\\\@<!([^)]*$'
+ let ind = s:GetOffsetOf(line, '\\\@!(')
+ endif
+
+ " if previous line has unmatched opening bracket,
+ " indent to its position. TODO: same as above
+ if line =~ '\[[^]]*$'
+ let ind = s:GetOffsetOf(line, '\[')
+ endif
+
+ " if previous line had an unmatched closing parantheses,
+ " indent to the matching opening parantheses
+ if line =~ '[^(]*\\\@<!)$'
+ call search(')', 'bW')
+ let lnum = searchpair('\\\@<!(', '', ')', 'bWn')
+ let ind = indent(lnum)
+ endif
+
+ " if previous line had an unmatched closing bracket,
+ " indent to the matching opening bracket
+ if line =~ '[^[]*]$'
+ call search(']', 'bW')
+ let lnum = searchpair('\[', '', ']', 'bWn')
+ let ind = indent(lnum)
+ endif
+
+ return ind
+endfunction
+
+" vim: set sts=2 sw=2: