if has_key(g:polyglot_is_disabled, 'nix')
finish
endif
" Vim indent file
" Language: Nix
" Maintainer: Daiderd Jordan <daiderd@gmail.com>
" URL: https://github.com/LnL7/vim-nix
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal indentexpr=GetNixIndent()
setlocal indentkeys+=0=then,0=else,0=inherit,0=in,*<Return>
if exists("*GetNixIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
let s:skip_syntax = '\%(Comment\|String\)$'
let s:binding_open = '\%(\<let\>\)'
let s:binding_close = '\%(\<in\>\)'
let s:block_open = '\%({\|[\)'
let s:block_close = '\%(}\|]\)'
function! GetNixIndent()
let lnum = prevnonblank(v:lnum - 1)
let ind = indent(lnum)
" At the start of the file use zero indent.
if lnum == 0
return 0
endif
" Skip indentation for single line comments explicitly, in case a
" comment was just inserted (eg. visual block mode)
if getline(v:lnum) =~ '^\s*#'
return indent(v:lnum)
endif
if synIDattr(synID(v:lnum, 1, 1), "name") !~ s:skip_syntax
let current_line = getline(v:lnum)
let last_line = getline(lnum)
if current_line =~ '^\s*in\>'
let save_cursor = getcurpos()
normal ^
let bslnum = searchpair(s:binding_open, '', s:binding_close, 'bnW',
\ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "StringSpecial$"')
call setpos('.', save_cursor)
return indent(bslnum)
endif
if last_line =~ s:block_open . '\s*$'
let ind += &sw
endif
if current_line =~ '^\s*' . s:block_close
let ind -= &sw
endif
if last_line =~ '[(=]$'
let ind += &sw
endif
if last_line =~ '\<let\s*$'
let ind += &sw
endif
if last_line =~ '^\<in\s*$'
let ind += &sw
endif
if current_line =~ '^\s*in\>'
let ind -= &sw
endif
endif
if synIDattr(synID(v:lnum, 1, 1), "name") =~ '^nixString'
let current_line = getline(v:lnum)
let ind = indent(v:lnum)
let bslnum = searchpair('''''', '', '''''', 'bnW',
\ 'synIDattr(synID(line("."), col("."), 0), "name") =~? "StringSpecial$"')
if ind <= indent(bslnum)
let ind = indent(bslnum) + &sw
endif
if current_line =~ '^\s*''''[^''\$]'
let ind = indent(bslnum)
endif
if current_line =~ '^\s*''''$'
let ind = indent(bslnum)
endif
endif
return ind
endfunction
let &cpo = s:cpo_save
unlet s:cpo_save
