| " 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 |