gist.vim

function! s:encodeURIComponent(instr)
  let instr = iconv(a:instr, &enc, "utf-8")
  let len = strlen(instr)
  let i = 0
  let outstr = ''
  while i < len
    let ch = instr[i]
    if ch =~# '[0-9A-Za-z-._~!''()*]'
      let outstr = outstr . ch
    elseif ch == ' '
      let outstr = outstr . '+'
    else
      let outstr = outstr . '%' . substitute('0' . s:nr2hex(char2nr(ch)), '^.*\(..\)$', '\1', '')
    endif
    let i = i + 1
  endwhile
  return outstr
endfunction