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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: 2021-09-29
+
+" 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
+
+let b:undo_indent = "setl et< inde< indk< lisp< si<"
+
+" 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