" Vim indent file
" Language: Elixir
" Maintainer: Carlos Galdino <carloshsgaldino@gmail.com>
" Last Change: 2013 Apr 24
if exists("b:did_indent")
finish
endif
let b:did_indent = 1
setlocal nosmartindent
setlocal indentexpr=GetElixirIndent()
setlocal indentkeys+=0=end,0=else,0=match,0=elsif,0=catch,0=after,0=rescue
if exists("*GetElixirIndent")
finish
endif
let s:cpo_save = &cpo
set cpo&vim
let s:skip_syntax = '\%(Comment\|String\)$'
let s:block_skip = "synIDattr(synID(line('.'),col('.'),1),'name') =~? '" . s:skip_syntax . "'"
let s:block_start = 'do\|fn'
let s:block_middle = 'else\|match\|elsif\|catch\|after\|rescue'
let s:block_end = 'end'
let s:arrow = '^.*->$'
let s:pipeline = '^\s*|>.*$'
let s:indent_keywords = '\<\%(' . s:block_start . '\|' . s:block_middle . '\)$' . '\|' . s:arrow
let s:deindent_keywords = '^\s*\<\%(' . s:block_end . '\|' . s:block_middle . '\)\>' . '\|' . s:arrow
function! GetElixirIndent()
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
" TODO: Remove these 2 lines
" I don't know why, but for the test on spec/indent/lists_spec.rb:24.
" Vim is making some mess on parsing the syntax of 'end', it is being
" recognized as 'elixirString' when should be recognized as 'elixirBlock'.
" This forces vim to sync the syntax.
call synID(v:lnum, 1, 1)
syntax sync fromstart
if synIDattr(synID(v:lnum, 1, 1), "name") !~ s:skip_syntax
let current_line = getline(v:lnum)
let last_line = getline(lnum)
let splited_line = split(last_line, '\zs')
let opened_symbol = 0
let opened_symbol += count(splited_line, '[') - count(splited_line, ']')
let opened_symbol += count(splited_line, '{') - count(splited_line, '}')
let ind += opened_symbol * &sw
if current_line =~ '^\s*\(\]\|}\)'
let ind -= &sw
endif
if last_line =~ s:indent_keywords
let ind += &sw
endif
" if line starts with pipeline
" and last line contains pipeline(s)
" align them
if last_line =~ '|>.*$' &&
\ current_line =~ s:pipeline
let ind = float2nr(match(last_line, '|>') / &sw) * &sw
" if line starts with pipeline
" and last line is an attribution
" indents pipeline in same level as attribution
elseif current_line =~ s:pipeline &&
\ last_line =~ '^[^=]\+=.\+$'
let b:old_ind = ind
let ind = float2nr(matchend(last_line, '=\s*[^ ]') / &sw) * &sw
endif
" if last line starts with pipeline
" and current line doesn't start with pipeline
" returns the indentation before the pipeline
if last_line =~ s:pipeline &&
\ current_line !~ s:pipeline
let ind = b:old_ind
endif
if current_line =~ s:deindent_keywords
let bslnum = searchpair( '\<\%(' . s:block_start . '\):\@!\>',
\ '\<\%(' . s:block_middle . '\):\@!\>\zs',
\ '\<:\@<!' . s:block_end . '\>\zs',
\ 'nbW',
\ s:block_skip )
let ind = indent(bslnum)
endif
" indent case statements '->'
if current_line =~ s:arrow
let ind += &sw
endif
endif
return ind
endfunction
let &cpo = s:cpo_save
unlet s:cpo_save
