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" Vim indent file
" Language: Lua script
" Maintainer: Marcus Aurelius Farias <marcus.cf 'at' bol.com.br>
" First Author: Max Ischenko <mfi 'at' ukr.net>
" Last Change: 2005 Jun 23
" Only load this indent file when no other was loaded.
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetLuaIndent()
" To make Vim call GetLuaIndent() when it finds '\s*end' or '\s*until'
" on the current line ('else' is default and includes 'elseif').
setlocal indentkeys+=0=end,0=until
setlocal autoindent
" Only define the function once.
if exists("*GetLuaIndent")
finish
endif
function! GetLuaIndent()
" 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
" Add a 'shiftwidth' after lines that start a block:
" 'function', 'if', 'for', 'while', 'repeat', 'else', 'elseif', '{'
let ind = indent(lnum)
let flag = 0
let prevline = getline(lnum)
if prevline =~ '^\s*\%(if\>\|for\>\|while\>\|repeat\>\|else\>\|elseif\>\|do\>\|then\>\)'
\ || prevline =~ '\%(--.*\)\@<!{\s*$' || prevline =~ '\%(--.*\)\@<!\<function\>\s*\%(\k\|[.:]\)\{-}\s*('
let ind = ind + &shiftwidth
let flag = 1
endif
" Subtract a 'shiftwidth' after lines ending with
" 'end' when they begin with 'while', 'if', 'for', etc. too.
if flag == 1 && prevline =~ '\<end\>\|\<until\>'
let ind = ind - &shiftwidth
endif
" Subtract a 'shiftwidth' on end, else (and elseif), until and '}'
" This is the part that requires 'indentkeys'.
if getline(v:lnum) =~ '^\s*\%(end\|else\|until\|}\)'
let ind = ind - &shiftwidth
endif
return ind
endfunction
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