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if polyglot#init#is_disabled(expand('<sfile>:p'), 'lua', 'indent/lua.vim')
finish
endif
" 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*[)}]\)\+'
let s:chained_func_call = "^\\v\\s*[:.]\\w+[({\"']"
" 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--.*$', '', '')
endfunction
" GetLuaIndent Function -----------------------------------{{{1
function GetLuaIndent()
" if the line is in a long comment or string, don't change the indent
if s:IsInCommentOrString(v:lnum, 1)
return -1
endif
let prev_line = s:PrevLineOfCode(v:lnum - 1)
if prev_line == 0
" this is the first non-empty line
return 0
endif
let contents_cur = s:GetContents(v:lnum)
let contents_prev = s:GetContents(prev_line)
let original_cursor_pos = getpos(".")
" count how many blocks the previous line opens
call cursor(v:lnum, 1)
let num_prev_opens = searchpair(s:open_patt, s:middle_patt, s:close_patt,
\ 'mrb', s:skip_expr, prev_line)
" count how many blocks the current line closes
call cursor(prev_line, col([prev_line,'$']))
let num_cur_closes = searchpair(s:open_patt, s:middle_patt, s:close_patt,
\ 'mr', s:skip_expr, v:lnum)
let i = num_prev_opens - num_cur_closes
" if the previous line closed a paren, outdent (except with anon funcs)
call cursor(prev_line - 1, col([prev_line - 1, '$']))
let num_prev_closed_parens = searchpair('(', '', ')', 'mr', s:skip_expr, prev_line)
if num_prev_closed_parens > 0 && contents_prev !~# s:anon_func_end
let i -= 1
endif
" if this line closed a paren, indent (except with anon funcs)
call cursor(prev_line, col([prev_line, '$']))
let num_cur_closed_parens = searchpair('(', '', ')', 'mr', s:skip_expr, v:lnum)
if num_cur_closed_parens > 0 && contents_cur !~# s:anon_func_end
let i += 1
endif
" if the current line chains a function call to previous unchained line
if contents_prev !~# s:chained_func_call && contents_cur =~# s:chained_func_call
let i += 1
endif
" if the current line chains a function call to previous unchained line
if contents_prev =~# s:chained_func_call && contents_cur !~# s:chained_func_call
let i -= 1
endif
" special case: call(with, {anon = function() -- should indent only once
if i > 1 && contents_prev =~# s:anon_func_start
let i = 1
endif
" special case: end}) -- end of call w/ anon func should outdent only once
if i < -1 && contents_cur =~# s:anon_func_end
let i = -1
endif
" restore cursor
call setpos(".", original_cursor_pos)
return indent(prev_line) + (shiftwidth() * i)
endfunction
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