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xmlformat.vim
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" Vim plugin for formatting XML " Last Change: 2019 Oct 24 " Version: 0.2 " Author: Christian Brabandt <cb@256bit.org> " Repository: https://github.com/chrisbra/vim-xml-ftplugin " License: VIM License " Documentation: see :h xmlformat.txt (TODO!) " --------------------------------------------------------------------- " Load Once: {{{1 if exists("g:loaded_xmlformat") || &cp finish endif let g:loaded_xmlformat = 1 let s:keepcpo = &cpo set cpo&vim " Main function: Format the input {{{1 func! xmlformat#Format() " only allow reformatting through the gq command " (e.g. Vim is in normal mode) if mode() != 'n' " do not fall back to internal formatting return 0 endif let count_orig = v:count let sw = shiftwidth() let prev = prevnonblank(v:lnum-1) let s:indent = indent(prev)/sw let result = [] let lastitem = prev ? getline(prev) : '' let is_xml_decl = 0 " go through every line, but don't join all content together and join it " back. We might lose empty lines let list = getline(v:lnum, (v:lnum + count_orig - 1)) let current = 0 for line in list " Keep empty input lines? if empty(line) call add(result, '') continue elseif line !~# '<[/]\?[^>]*>' let nextmatch = match(list, '<[/]\?[^>]*>', current) let line .= join(list[(current + 1):(nextmatch-1)], "\n") call remove(list, current+1, nextmatch-1) endif " split on `>`, but don't split on very first opening < " this means, items can be like ['<tag>', 'tag content</tag>'] for item in split(line, '.\@<=[>]\zs') if s:EndTag(item) let s:indent = s:DecreaseIndent() call add(result, s:Indent(item)) elseif s:EmptyTag(lastitem) call add(result, s:Indent(item)) elseif s:StartTag(lastitem) && s:IsTag(item) let s:indent += 1 call add(result, s:Indent(item)) else if !s:IsTag(item) " Simply split on '<', if there is one, " but reformat according to &textwidth let t=split(item, '.<\@=\zs') " t should only contain 2 items, but just be safe here if s:IsTag(lastitem) let s:indent+=1 endif let result+=s:FormatContent([t[0]]) if s:EndTag(t[1]) let s:indent = s:DecreaseIndent() endif "for y in t[1:] let result+=s:FormatContent(t[1:]) "endfor else call add(result, s:Indent(item)) endif endif let lastitem = item endfor let current += 1 endfor if !empty(result) let lastprevline = getline(v:lnum + count_orig) let delete_lastline = v:lnum + count_orig - 1 == line('$') exe v:lnum. ",". (v:lnum + count_orig - 1). 'd' call append(v:lnum - 1, result) " Might need to remove the last line, if it became empty because of the " append() call let last = v:lnum + len(result) " do not use empty(), it returns true for `empty(0)` if getline(last) is '' && lastprevline is '' && delete_lastline exe last. 'd' endif endif " do not run internal formatter! return 0 endfunc " Check if given tag is XML Declaration header {{{1 func! s:IsXMLDecl(tag) return a:tag =~? '^\s*<?xml\s\?\%(version="[^"]*"\)\?\s\?\%(encoding="[^"]*"\)\? ?>\s*$' endfunc " Return tag indented by current level {{{1 func! s:Indent(item) return repeat(' ', shiftwidth()*s:indent). s:Trim(a:item) endfu " Return item trimmed from leading whitespace {{{1 func! s:Trim(item) if exists('*trim') return trim(a:item) else return matchstr(a:item, '\S\+.*') endif endfunc " Check if tag is a new opening tag <tag> {{{1 func! s:StartTag(tag) let is_comment = s:IsComment(a:tag) return a:tag =~? '^\s*<[^/?]' && !is_comment endfunc " Check if tag is a Comment start {{{1 func! s:IsComment(tag) return a:tag =~? '<!--' endfunc " Remove one level of indentation {{{1 func! s:DecreaseIndent() return (s:indent > 0 ? s:indent - 1 : 0) endfunc " Check if tag is a closing tag </tag> {{{1 func! s:EndTag(tag) return a:tag =~? '^\s*</' endfunc " Check that the tag is actually a tag and not {{{1 " something like "foobar</foobar>" func! s:IsTag(tag) return s:Trim(a:tag)[0] == '<' endfunc " Check if tag is empty <tag/> {{{1 func! s:EmptyTag(tag) return a:tag =~ '/>\s*$' endfunc " Format input line according to textwidth {{{1 func! s:FormatContent(list) let result=[] let limit = 80 if &textwidth > 0 let limit = &textwidth endif let column=0 let idx = -1 let add_indent = 0 let cnt = 0 for item in a:list for word in split(item, '\s\+\S\+\zs') let column += strdisplaywidth(word, column) if match(word, "^\\s*\n\\+\\s*$") > -1 call add(result, '') let idx += 1 let column = 0 let add_indent = 1 elseif column > limit || cnt == 0 let add = s:Indent(s:Trim(word)) call add(result, add) let column = strdisplaywidth(add) let idx += 1 else if add_indent let result[idx] = s:Indent(s:Trim(word)) else let result[idx] .= ' '. s:Trim(word) endif let add_indent = 0 endif let cnt += 1 endfor endfor return result endfunc " Restoration And Modelines: {{{1 let &cpo= s:keepcpo unlet s:keepcpo " Modeline {{{1 " vim: fdm=marker fdl=0 ts=2 et sw=0 sts=-1