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indent
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clojure.vim
" Vim indent file " Language: Clojure " Maintainer: Alex Vear <alex@vear.uk> " Former Maintainers: Sung Pae <self@sungpae.com> " Meikel Brandmeyer <mb@kotka.de> " URL: https://github.com/clojure-vim/clojure.vim " License: Vim (see :h license) " Last Change: 2021-10-26 if exists("b:did_indent") finish endif let b:did_indent = 1 let s:save_cpo = &cpo set cpo&vim let b:undo_indent = 'setlocal autoindent< smartindent< expandtab< softtabstop< shiftwidth< indentexpr< indentkeys<' setlocal noautoindent nosmartindent setlocal softtabstop=2 shiftwidth=2 expandtab setlocal indentkeys=!,o,O if exists("*searchpairpos") if !exists('g:clojure_maxlines') let g:clojure_maxlines = 300 endif if !exists('g:clojure_fuzzy_indent') let g:clojure_fuzzy_indent = 1 endif if !exists('g:clojure_fuzzy_indent_patterns') let g:clojure_fuzzy_indent_patterns = ['^with', '^def', '^let'] endif if !exists('g:clojure_fuzzy_indent_blacklist') let g:clojure_fuzzy_indent_blacklist = ['-fn$', '\v^with-%(meta|out-str|loading-context)$'] endif if !exists('g:clojure_special_indent_words') let g:clojure_special_indent_words = 'deftype,defrecord,reify,proxy,extend-type,extend-protocol,letfn' endif if !exists('g:clojure_align_multiline_strings') let g:clojure_align_multiline_strings = 0 endif if !exists('g:clojure_align_subforms') let g:clojure_align_subforms = 0 endif function! s:syn_id_name() return synIDattr(synID(line("."), col("."), 0), "name") endfunction function! s:ignored_region() return s:syn_id_name() =~? '\vstring|regex|comment|character' endfunction function! s:current_char() return getline('.')[col('.')-1] endfunction function! s:current_word() return getline('.')[col('.')-1 : searchpos('\v>', 'n', line('.'))[1]-2] endfunction function! s:is_paren() return s:current_char() =~# '\v[\(\)\[\]\{\}]' && !s:ignored_region() endfunction " Returns 1 if string matches a pattern in 'patterns', which should be " a list of patterns. function! s:match_one(patterns, string) for pat in a:patterns if a:string =~# pat | return 1 | endif endfor endfunction function! s:match_pairs(open, close, stopat) " Stop only on vector and map [ resp. {. Ignore the ones in strings and " comments. if a:stopat == 0 && g:clojure_maxlines > 0 let stopat = max([line(".") - g:clojure_maxlines, 0]) else let stopat = a:stopat endif let pos = searchpairpos(a:open, '', a:close, 'bWn', "!s:is_paren()", stopat) return [pos[0], col(pos)] endfunction function! s:clojure_check_for_string_worker() " Check whether there is the last character of the previous line is " highlighted as a string. If so, we check whether it's a ". In this " case we have to check also the previous character. The " might be the " closing one. In case the we are still in the string, we search for the " opening ". If this is not found we take the indent of the line. let nb = prevnonblank(v:lnum - 1) if nb == 0 return -1 endif call cursor(nb, 0) call cursor(0, col("$") - 1) if s:syn_id_name() !~? "string" return -1 endif " This will not work for a " in the first column... if s:current_char() == '"' call cursor(0, col("$") - 2) if s:syn_id_name() !~? "string" return -1 endif if s:current_char() != '\' return -1 endif call cursor(0, col("$") - 1) endif let p = searchpos('\(^\|[^\\]\)\zs"', 'bW') if p != [0, 0] return p[1] - 1 endif return indent(".") endfunction function! s:check_for_string() let pos = getpos('.') try let val = s:clojure_check_for_string_worker() finally call setpos('.', pos) endtry return val endfunction function! s:strip_namespace_and_macro_chars(word) return substitute(a:word, "\\v%(.*/|[#'`~@^,]*)(.*)", '\1', '') endfunction function! s:clojure_is_method_special_case_worker(position) " Find the next enclosing form. call search('\S', 'Wb') " Special case: we are at a '(('. if s:current_char() == '(' return 0 endif call cursor(a:position) let next_paren = s:match_pairs('(', ')', 0) " Special case: we are now at toplevel. if next_paren == [0, 0] return 0 endif call cursor(next_paren) call search('\S', 'W') let w = s:strip_namespace_and_macro_chars(s:current_word()) if g:clojure_special_indent_words =~# '\V\<' . w . '\>' " `letfn` is a special-special-case. if w ==# 'letfn' " Earlier code left the cursor at: " (letfn [...] ...) " ^ " Search and get coordinates of first `[` " (letfn [...] ...) " ^ call search('\[', 'W') let pos = getcurpos() let letfn_bracket = [pos[1], pos[2]] " Move cursor to start of the form this function was " initially called on. Grab the coordinates of the " closest outer `[`. call cursor(a:position) let outer_bracket = s:match_pairs('\[', '\]', 0) " If the located square brackets are not the same, " don't use special-case formatting. if outer_bracket != letfn_bracket return 0 endif endif return 1 endif return 0 endfunction function! s:is_method_special_case(position) let pos = getpos('.') try let val = s:clojure_is_method_special_case_worker(a:position) finally call setpos('.', pos) endtry return val endfunction " Check if form is a reader conditional, that is, it is prefixed by #? " or #?@ function! s:is_reader_conditional_special_case(position) return getline(a:position[0])[a:position[1] - 3 : a:position[1] - 2] == "#?" \|| getline(a:position[0])[a:position[1] - 4 : a:position[1] - 2] == "#?@" endfunction " Returns 1 for opening brackets, -1 for _anything else_. function! s:bracket_type(char) return stridx('([{', a:char) > -1 ? 1 : -1 endfunction " Returns: [opening-bracket-lnum, indent] function! s:clojure_indent_pos() " Get rid of special case. if line(".") == 1 return [0, 0] endif " We have to apply some heuristics here to figure out, whether to use " normal lisp indenting or not. let i = s:check_for_string() if i > -1 return [0, i + !!g:clojure_align_multiline_strings] endif call cursor(0, 1) " Find the next enclosing [ or {. We can limit the second search " to the line, where the [ was found. If no [ was there this is " zero and we search for an enclosing {. let paren = s:match_pairs('(', ')', 0) let bracket = s:match_pairs('\[', '\]', paren[0]) let curly = s:match_pairs('{', '}', bracket[0]) " In case the curly brace is on a line later then the [ or - in " case they are on the same line - in a higher column, we take the " curly indent. if curly[0] > bracket[0] || curly[1] > bracket[1] if curly[0] > paren[0] || curly[1] > paren[1] return curly endif endif " If the curly was not chosen, we take the bracket indent - if " there was one. if bracket[0] > paren[0] || bracket[1] > paren[1] return bracket endif " There are neither { nor [ nor (, ie. we are at the toplevel. if paren == [0, 0] return paren endif " Now we have to reimplement lispindent. This is surprisingly easy, as " soon as one has access to syntax items. " " - Check whether we are in a special position after a word in " g:clojure_special_indent_words. These are special cases. " - Get the next keyword after the (. " - If its first character is also a (, we have another sexp and align " one column to the right of the unmatched (. " - In case it is in lispwords, we indent the next line to the column of " the ( + sw. " - If not, we check whether it is last word in the line. In that case " we again use ( + sw for indent. " - In any other case we use the column of the end of the word + 2. call cursor(paren) if s:is_method_special_case(paren) return [paren[0], paren[1] + &shiftwidth - 1] endif if s:is_reader_conditional_special_case(paren) return paren endif " In case we are at the last character, we use the paren position. if col("$") - 1 == paren[1] return paren endif " In case after the paren is a whitespace, we search for the next word. call cursor(0, col('.') + 1) if s:current_char() == ' ' call search('\v\S', 'W') endif " If we moved to another line, there is no word after the (. We " use the ( position for indent. if line(".") > paren[0] return paren endif " We still have to check, whether the keyword starts with a (, [ or {. " In that case we use the ( position for indent. let w = s:current_word() if s:bracket_type(w[0]) == 1 return paren endif " If the keyword begins with #, check if it is an anonymous " function or set, in which case we indent by the shiftwidth " (minus one if g:clojure_align_subforms = 1), or if it is " ignored, in which case we use the ( position for indent. if w[0] == "#" " TODO: Handle #=() and other rare reader invocations? if w[1] == '(' || w[1] == '{' return [paren[0], paren[1] + (g:clojure_align_subforms ? 0 : &shiftwidth - 1)] elseif w[1] == '_' return paren endif endif " Test words without namespace qualifiers and leading reader macro " metacharacters. " " e.g. clojure.core/defn and #'defn should both indent like defn. let ww = s:strip_namespace_and_macro_chars(w) if &lispwords =~# '\V\<' . ww . '\>' return [paren[0], paren[1] + &shiftwidth - 1] endif if g:clojure_fuzzy_indent \ && !s:match_one(g:clojure_fuzzy_indent_blacklist, ww) \ && s:match_one(g:clojure_fuzzy_indent_patterns, ww) return [paren[0], paren[1] + &shiftwidth - 1] endif call search('\v\_s', 'cW') call search('\v\S', 'W') if paren[0] < line(".") return [paren[0], paren[1] + (g:clojure_align_subforms ? 0 : &shiftwidth - 1)] endif call search('\v\S', 'bW') return [line('.'), col('.') + 1] endfunction function! GetClojureIndent() let lnum = line('.') let orig_lnum = lnum let orig_col = col('.') let [opening_lnum, indent] = s:clojure_indent_pos() " Account for multibyte characters if opening_lnum > 0 let indent -= indent - virtcol([opening_lnum, indent]) endif " Return if there are no previous lines to inherit from if opening_lnum < 1 || opening_lnum >= lnum - 1 call cursor(orig_lnum, orig_col) return indent endif let bracket_count = 0 " Take the indent of the first previous non-white line that is " at the same sexp level. cf. src/misc1.c:get_lisp_indent() while 1 let lnum = prevnonblank(lnum - 1) let col = 1 if lnum <= opening_lnum break endif call cursor(lnum, col) " Handle bracket counting edge case if s:is_paren() let bracket_count += s:bracket_type(s:current_char()) endif while 1 if search('\v[(\[{}\])]', '', lnum) < 1 break elseif !s:ignored_region() let bracket_count += s:bracket_type(s:current_char()) endif endwhile if bracket_count == 0 " Check if this is part of a multiline string call cursor(lnum, 1) if s:syn_id_name() !~? '\vstring|regex' call cursor(orig_lnum, orig_col) return indent(lnum) endif endif endwhile call cursor(orig_lnum, orig_col) return indent endfunction setlocal indentexpr=GetClojureIndent() else " In case we have searchpairpos not available we fall back to " normal lisp indenting. setlocal indentexpr= setlocal lisp let b:undo_indent .= '| setlocal lisp<' endif let &cpo = s:save_cpo unlet! s:save_cpo " vim:sts=8:sw=8:ts=8:noet
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