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" Elm indent plugin file
" Language: Elm
" Maintainer: Andreas Scharf <as@99n.de>
" Original Author: Joseph Hager <ajhager@gmail.com>
" Copyright: Joseph Hager <ajhager@gmail.com>
" License: BSD3
" Latest Revision: 2020-05-29
" Only load this indent file when no other was loaded.
if exists('b:did_indent')
finish
endif
let b:did_indent = 1
" Local defaults
setlocal expandtab
setlocal indentexpr=GetElmIndent()
setlocal indentkeys+=0=else,0=if,0=of,0=import,0=then,0=type,0\|,0},0\],0),=-},0=in
setlocal nolisp
setlocal nosmartindent
" Only define the function once.
if exists('*GetElmIndent')
finish
endif
" Indent pairs
function! s:FindPair(pstart, pmid, pend)
"call search(a:pend, 'bW')
return indent(searchpair(a:pstart, a:pmid, a:pend, 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string\\|comment"'))
endfunction
function! GetElmIndent()
let l:lnum = v:lnum - 1
" Ident 0 if the first line of the file:
if l:lnum == 0
return 0
endif
let l:ind = indent(l:lnum)
let l:lline = getline(l:lnum)
let l:line = getline(v:lnum)
" Indent if current line begins with '}':
if l:line =~? '^\s*}'
return s:FindPair('{', '', '}')
" Indent if current line begins with 'else':
elseif l:line =~# '^\s*else\>'
if l:lline !~# '^\s*\(if\|then\)\>'
return s:FindPair('\<if\>', '', '\<else\>')
endif
" Indent if current line begins with 'then':
elseif l:line =~# '^\s*then\>'
if l:lline !~# '^\s*\(if\|else\)\>'
return s:FindPair('\<if\>', '', '\<then\>')
endif
" HACK: Indent lines in case with nearest case clause:
elseif l:line =~# '->' && l:line !~# ':' && l:line !~# '\\'
return indent(search('^\s*case', 'bWn')) + &shiftwidth
" HACK: Don't change the indentation if the last line is a comment.
elseif l:lline =~# '^\s*--'
return l:ind
" Align the end of block comments with the start
elseif l:line =~# '^\s*-}'
return indent(search('{-', 'bWn'))
" Indent double shift after let with an empty rhs
elseif l:lline =~# '\<let\>.*\s=$'
return l:ind + 4 + &shiftwidth
" Align 'in' with the parent let.
elseif l:line =~# '^\s*in\>'
return indent(search('^\s*let', 'bWn'))
" Align bindings with the parent let.
elseif l:lline =~# '\<let\>'
return l:ind + 4
" Align bindings with the parent in.
elseif l:lline =~# '^\s*in\>'
return l:ind
endif
" Add a 'shiftwidth' after lines ending with:
if l:lline =~# '\(|\|=\|->\|<-\|(\|\[\|{\|\<\(of\|else\|if\|then\)\)\s*$'
let l:ind = l:ind + &shiftwidth
" Add a 'shiftwidth' after lines starting with type ending with '=':
elseif l:lline =~# '^\s*type' && l:line =~# '^\s*='
let l:ind = l:ind + &shiftwidth
" Back to normal indent after comments:
elseif l:lline =~# '-}\s*$'
call search('-}', 'bW')
let l:ind = indent(searchpair('{-', '', '-}', 'bWn', 'synIDattr(synID(line("."), col("."), 0), "name") =~? "string"'))
" Ident some operators if there aren't any starting the last line.
elseif l:line =~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*\(!\|&\|(\|`\|+\||\|{\|[\|,\)=' && l:lline !~# '^\s*$'
let l:ind = l:ind + &shiftwidth
elseif l:lline ==# '' && getline(l:lnum - 1) !=# ''
let l:ind = indent(search('^\s*\S+', 'bWn'))
endif
return l:ind
endfunc