" PostScript indent file
" Language: PostScript
" Maintainer: Mike Williams <[email protected]>
" Last Change: 2nd July 2001
"

" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1

setlocal indentexpr=PostscrIndentGet(v:lnum)
setlocal indentkeys+=0],0=>>,0=%%,0=end,0=restore,0=grestore indentkeys-=:,0#,e

" Catch multiple instantiations
if exists("*PostscrIndentGet")
finish
endif

function! PostscrIndentGet(lnum)
" Find a non-empty non-comment line above the current line.
" Note: ignores DSC comments as well!
let lnum = a:lnum - 1
while lnum != 0
let lnum = prevnonblank(lnum)
if getline(lnum) !~ '^\s*%.*$'
break
endif
let lnum = lnum - 1
endwhile

" Hit the start of the file, use user indent.
if lnum == 0
return -1
endif

" Start with the indent of the previous line
let ind = indent(lnum)
let pline = getline(lnum)

" Indent for dicts, arrays, and saves with possible trailing comment
if pline =~ '\(begin\|<<\|g\=save\|{\|[\)\s*\(%.*\)\=$'
let ind = ind + &sw
endif

" Remove indent for popped dicts, and restores.
if pline =~ '\(end\|g\=restore\)\s*$'
let ind = ind - &sw

" Else handle immediate dedents of dicts, restores, and arrays.
elseif getline(a:lnum) =~ '\(end\|>>\|g\=restore\|}\|]\)'
let ind = ind - &sw

" Else handle DSC comments - always start of line.
elseif getline(a:lnum) =~ '^\s*%%'
let ind = 0
endif

" For now catch excessive left indents if they occur.
if ind < 0
let ind = -1
endif

return ind
endfunction

" vim:sw=2