Vim - My vimrc snippet for escaping the selection in various schemes.

escape_selection.vim

"---------------------------------------
" Escape

" html
xnoremap <silent> eh :<C-u>call <SID>selection_escape_html()<CR>
xnoremap <silent> uh :<C-u>call <SID>selection_unescape_html()<CR>

function! s:selection_escape_html()
  call util#filter_selection("ruby -rcgi -pe '$_ = CGI.escapeHTML($_)'")
endfunction

function! s:selection_unescape_html()
  call util#filter_selection("ruby -rcgi -pe '$_ = CGI.unescapeHTML($_)'")
endfunction

" unicode
xnoremap <silent> eU :<C-u>call <SID>selection_escape_unicode()<CR>
xnoremap <silent> uU :<C-u>call <SID>selection_unescape_unicode()<CR>

function! s:selection_escape_unicode()
  call util#filter_selection(
        \ "ruby -pe '$_ = $_.chomp.unpack(\"U*\").map{|i| \"\\\\u%04x\" % i }.join + \"\\n\"'")
endfunction

function! s:selection_unescape_unicode()
  call util#filter_selection(
        \ "ruby -pe 'a=[]; $_.gsub!(/\\u([[:xdigit:]]{4})/) { a[0] = $1.hex; a.pack(\"U\") }'")
endfunction

" uri
xnoremap <silent> eu :<C-u>call <SID>selection_escape_uri()<CR>
xnoremap <silent> uu :<C-u>call <SID>selection_unescape_uri()<CR>

function! s:selection_escape_uri()
  call util#filter_selection("ruby -ruri -pe '$_ = URI.escape($_.chomp) + \"\\n\"'")
endfunction

function! s:selection_unescape_uri()
  call util#filter_selection("ruby -ruri -pe '$_ = URI.unescape($_)'")
endfunction