if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'vim') == -1
" 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: 2017 Jun 13
" 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 prevlnum = prevnonblank(v:lnum - 1)
" Hit the start of the file, use zero indent.
if prevlnum == 0
return 0
endif
" Add a 'shiftwidth' after lines that start a block:
" 'function', 'if', 'for', 'while', 'repeat', 'else', 'elseif', '{'
let ind = indent(prevlnum)
let prevline = getline(prevlnum)
let midx = match(prevline, '^\s*\%(if\>\|for\>\|while\>\|repeat\>\|else\>\|elseif\>\|do\>\|then\>\)')
if midx == -1
let midx = match(prevline, '{\s*$')
if midx == -1
let midx = match(prevline, '\<function\>\s*\%(\k\|[.:]\)\{-}\s*(')
endif
endif
if midx != -1
" Add 'shiftwidth' if what we found previously is not in a comment and
" an "end" or "until" is not present on the same line.
if synIDattr(synID(prevlnum, midx + 1, 1), "name") != "luaComment" && prevline !~ '\<end\>\|\<until\>'
let ind = ind + shiftwidth()
endif
endif
" Subtract a 'shiftwidth' on end, else, elseif, until and '}'
" This is the part that requires 'indentkeys'.
let midx = match(getline(v:lnum), '^\s*\%(end\>\|else\>\|elseif\>\|until\>\|}\)')
if midx != -1 && synIDattr(synID(v:lnum, midx + 1, 1), "name") != "luaComment"
let ind = ind - shiftwidth()
endif
return ind
endfunction
endif
if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'lua') == -1
" Vim indent file
" Language: Lua
" URL: https://github.com/tbastos/vim-lua
" Initialization ------------------------------------------{{{1
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal autoindent
setlocal nosmartindent
setlocal indentexpr=GetLuaIndent()
setlocal indentkeys+=0=end,0=until,0=elseif,0=else
" Only define the function once.
if exists("*GetLuaIndent")
finish
endif
" Variables -----------------------------------------------{{{1
let s:open_patt = '\C\%(\<\%(function\|if\|repeat\|do\)\>\|(\|{\)'
let s:middle_patt = '\C\<\%(else\|elseif\)\>'
let s:close_patt = '\C\%(\<\%(end\|until\)\>\|)\|}\)'
let s:anon_func_start = '\S\+\s*[({].*\<function\s*(.*)\s*$'
let s:anon_func_end = '\<end\%(\s*[)}]\)\+'
" Expression used to check whether we should skip a match with searchpair().
let s:skip_expr = "synIDattr(synID(line('.'),col('.'),1),'name') =~# 'luaComment\\|luaString'"
" Auxiliary Functions -------------------------------------{{{1
function s:IsInCommentOrString(lnum, col)
return synIDattr(synID(a:lnum, a:col, 1), 'name') =~# 'luaCommentLong\|luaStringLong'
\ && !(getline(a:lnum) =~# '^\s*\%(--\)\?\[=*\[') " opening tag is not considered 'in'
endfunction
" Find line above 'lnum' that isn't blank, in a comment or string.
function s:PrevLineOfCode(lnum)
let lnum = prevnonblank(a:lnum)
while s:IsInCommentOrString(lnum, 1)
let lnum = prevnonblank(lnum - 1)
endwhile
return lnum
endfunction
" Gets line contents, excluding trailing comments.
function s:GetContents(lnum)
return substitute(getline(a:lnum), '\v\m--.*$', '', '')
endfunction
" GetLuaIndent Function -----------------------------------{{{1
function GetLuaIndent()
" if the line is in a long comment or string, don't change the indent
if s:IsInCommentOrString(v:lnum, 1)
return -1
endif
let prev_line = s:PrevLineOfCode(v:lnum - 1)
if prev_line == 0
" this is the first non-empty line
return 0
endif
let contents_cur = s:GetContents(v:lnum)
let contents_prev = s:GetContents(prev_line)
let original_cursor_pos = getpos(".")
let i = 0
" check if the previous line opens blocks
call cursor(v:lnum, 1)
let num_pairs = searchpair(s:open_patt, s:middle_patt, s:close_patt,
\ 'mrb', s:skip_expr, prev_line)
if num_pairs > 0
let i += num_pairs
endif
" special case: call(with, {anon = function() -- should indent only once
if num_pairs > 1 && contents_prev =~# s:anon_func_start
let i = 1
endif
" check if current line closes blocks
call cursor(prev_line, col([prev_line,'$']))
let num_pairs = searchpair(s:open_patt, s:middle_patt, s:close_patt,
\ 'mr', s:skip_expr, v:lnum)
if num_pairs > 0
let i -= num_pairs
endif
" special case: end}) -- end of call with anon func should unindent once
if num_pairs > 1 && contents_cur =~# s:anon_func_end
let i = -1
endif
" if the previous line closed a paren, unindent (except with anon funcs)
call cursor(prev_line - 1, col([prev_line - 1, '$']))
let num_pairs = searchpair('(', '', ')', 'mr', s:skip_expr, prev_line)
if num_pairs > 0 && contents_prev !~ s:anon_func_end
let i -= 1
endif
" if this line closed a paren, indent (except with anon funcs)
call cursor(prev_line, col([prev_line, '$']))
let num_pairs = searchpair('(', '', ')', 'mr', s:skip_expr, v:lnum)
if num_pairs > 0 && contents_cur !~ s:anon_func_end
let i += 1
endif
" restore cursor
call setpos(".", original_cursor_pos)
return indent(prev_line) + (&sw * i)
endfunction
endif
