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" Vim indent file
" Language: Treetop
" Maintainer: Doug Kearns <dougkearns@gmail.com>
" Previous Maintainer: Nikolai Weibull <now@bitwi.se>
" Last Change: 2022 April 25
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetTreetopIndent()
setlocal indentkeys=0{,0},!^F,o,O,=end
setlocal nosmartindent
let b:undo_indent = "setl inde< indk< si<"
if exists("*GetTreetopIndent")
finish
endif
function GetTreetopIndent()
let pnum = prevnonblank(v:lnum - 1)
if pnum == 0
return 0
endif
let ind = indent(pnum)
let line = getline(pnum)
if line =~ '^\s*\%(grammar\|module\|rule\)\>'
let ind += shiftwidth()
endif
let line = getline(v:lnum)
if line =~ '^\s*end\>'
let ind -= shiftwidth()
end
return ind
endfunction
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