" autoload/nrepl/fireplace_connection.vim
" Maintainer:   Tim Pope <http://tpo.pe/>

if exists("g:autoloaded_nrepl_fireplace_connection") || &cp
  finish
endif
let g:autoloaded_nrepl_fireplace_connection = 1

function! s:function(name) abort
  return function(substitute(a:name,'^s:',matchstr(expand('<sfile>'), '<SNR>\d\+_'),''))
endfunction

" Bencode {{{1

function! nrepl#fireplace_connection#bencode(value) abort
  if type(a:value) == type(0)
    return 'i'.a:value.'e'
  elseif type(a:value) == type('')
    return strlen(a:value).':'.a:value
  elseif type(a:value) == type([])
    return 'l'.join(map(a:value,'nrepl#fireplace_connection#bencode(v:val)'),'').'e'
  elseif type(a:value) == type({})
    return 'd'.join(values(map(a:value,'nrepl#fireplace_connection#bencode(v:key).nrepl#fireplace_connection#bencode(v:val)')),'').'e'
  else
    throw "Can't bencode ".string(a:value)
  endif
endfunction

function! nrepl#fireplace_connection#bdecode(value) abort
  return s:bdecode({'pos': 0, 'value': a:value})
endfunction

function! s:bdecode(state) abort
  let value = a:state.value
  if value[a:state.pos] =~# '\d'
    let pos = a:state.pos
    let length = matchstr(value[pos : -1], '^\d\+')
    let a:state.pos += strlen(length) + length + 1
    return value[pos+strlen(length)+1 : pos+strlen(length)+length]
  elseif value[a:state.pos] ==# 'i'
    let int = matchstr(value[a:state.pos+1:-1], '[^e]*')
    let a:state.pos += 2 + strlen(int)
    return str2nr(int)
  elseif value[a:state.pos] ==# 'l'
    let values = []
    let a:state.pos += 1
    while value[a:state.pos] !=# 'e' && value[a:state.pos] !=# ''
      call add(values, s:bdecode(a:state))
    endwhile
    let a:state.pos += 1
    return values
  elseif value[a:state.pos] ==# 'd'
    let values = {}
    let a:state.pos += 1
    while value[a:state.pos] !=# 'e' && value[a:state.pos] !=# ''
      let key = s:bdecode(a:state)
      let values[key] = s:bdecode(a:state)
    endwhile
    let a:state.pos += 1
    return values
  else
    throw 'bencode parse error: '.string(a:state)
  endif
endfunction

" }}}1

function! s:shellesc(arg) abort
  if a:arg =~ '^[A-Za-z0-9_/.-]\+$'
    return a:arg
  elseif &shell =~# 'cmd'
    return '"'.substitute(substitute(a:arg, '"', '""""', 'g'), '%', '"%"', 'g').'"'
  else
    let escaped = shellescape(a:arg)
    if &shell =~# 'sh' && &shell !~# 'csh'
      return substitute(escaped, '\\\n', '\n', 'g')
    else
      return escaped
    endif
  endif
endfunction

function! nrepl#fireplace_connection#prompt() abort
  return fireplace#input_host_port()
endfunction

function! nrepl#fireplace_connection#open(arg) abort
  if a:arg =~# '^\d\+$'
    let host = 'localhost'
    let port = a:arg
  elseif a:arg =~# ':\d\+$'
    let host = matchstr(a:arg, '.*\ze:')
    let port = matchstr(a:arg, ':\zs.*')
  else
    throw "nREPL: Couldn't find [host:]port in " . a:arg
  endif
  let client = deepcopy(s:nrepl)
  let client.host = host
  let client.port = port
  let session = client.process({'op': 'clone'})['new-session']
  let response = client.process({'op': 'eval', 'session': session, 'code':
        \ '(do (println "success") (symbol (str (System/getProperty "path.separator") (System/getProperty "java.class.path"))))'})
  let client._path = response.value[-1]
  if has_key(response, 'out')
    let client.session = session
  endif
  return client
endfunction

function! s:nrepl_path() dict abort
  return split(self._path[1:-1], self._path[0])
endfunction

function! s:nrepl_process(payload) dict abort
  let combined = {'status': [], 'session': []}
  for response in self.call(a:payload)
    for key in keys(response)
      if key ==# 'id' || key ==# 'ns'
        let combined[key] = response[key]
      elseif key ==# 'value'
        let combined.value = extend(get(combined, 'value', []), [response.value])
      elseif key ==# 'status'
        for entry in response[key]
          if index(combined[key], entry) < 0
            call extend(combined[key], [entry])
          endif
        endfor
      elseif key ==# 'session'
        if index(combined[key], response[key]) < 0
          call extend(combined[key], [response[key]])
        endif
      elseif key ==# 'out' && response.out =~# '^\b.*(.*)$'
        let combined.stacktrace = split(response.out, "\b")
      elseif type(response[key]) == type('')
        let combined[key] = get(combined, key, '') . response[key]
      else
        let combined[key] = response[key]
      endif
    endfor
  endfor
  if index(combined.status, 'error') >= 0
    throw 'nREPL: ' . tr(combined.status[0], '-', ' ')
  endif
  return combined
endfunction

function! s:nrepl_eval(expr, ...) dict abort
  let payload = {"op": "eval"}
  let payload.code = '(try (clojure.core/eval ''(do '.a:expr."\n".'))' .
        \ ' (catch Exception e' .
        \ '   (clojure.core/print (clojure.core/apply clojure.core/str (clojure.core/interleave (clojure.core/repeat "\b") (clojure.core/map clojure.core/str (.getStackTrace e)))))' .
        \ '   (throw e)))'
  let options = a:0 ? a:1 : {}
  if has_key(options, 'ns')
    let payload.ns = options.ns
  elseif has_key(self, 'ns')
    let payload.ns = self.ns
  endif
  if get(options, 'session', 1)
    if has_key(self, 'session')
      let payload.session = self.session
    elseif &verbose
      echohl WarningMSG
      echo "nREPL: server has bug preventing session support"
      echohl None
    endif
  endif
  let response = self.process(payload)
  if has_key(response, 'ns') && !a:0
    let self.ns = response.ns
  endif

  if has_key(response, 'value')
    let response.value = response.value[-1]
  endif
  return response
endfunction

function! s:nrepl_call(payload) dict abort
  let in = 'ruby -rsocket -e '.s:shellesc(
        \ 'begin;' .
        \ 'TCPSocket.open(%(' . self.host . '), ' . self.port . ') {|s|' .
        \ 's.write(ARGV.first); loop {' .
        \ 'body = s.readpartial(8192);' .
        \ 'raise %(not an nREPL server: upgrade to Leiningen 2) if body =~ /=> $/;' .
        \ 'print body;' .
        \ 'break if body.include?(%(6:statusl4:done)) }};' .
        \ 'rescue; abort $!.to_s;' .
        \ 'end') . ' ' .
        \ s:shellesc(nrepl#fireplace_connection#bencode(a:payload))
  let out = system(in)
  if !v:shell_error
    return nrepl#fireplace_connection#bdecode('l'.out.'e')
  endif
  throw 'nREPL: '.split(out, "\n")[0]
endfunction

let s:nrepl = {
      \ 'call': s:function('s:nrepl_call'),
      \ 'eval': s:function('s:nrepl_eval'),
      \ 'path': s:function('s:nrepl_path'),
      \ 'process': s:function('s:nrepl_process')}

if !has('python')
  finish
endif

python << EOF
import vim
import select
import socket
import string
import re

def fireplace_string_encode(input):
  str_list = []
  for c in input:
    if (000 <= ord(c) and ord(c) <= 037) or c == '"' or c == "\\":
      str_list.append("\\{0:03o}" % ord(c))
    else:
      str_list.append(c)
  return '"' + ''.join(str_list) + '"'

def fireplace_let(var, value):
  return vim.command('let ' + var + " = " + fireplace_string_encode(value))

def fireplace_repl_interact():
  buffer = ''
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  host = vim.eval('self.host')
  port = int(vim.eval('self.port'))
  s.settimeout(8)
  try:
    try:
      s.connect((host, port))
      s.setblocking(1)
      s.sendall(vim.eval('payload'))
      while True:
        while len(select.select([s], [], [], 0.1)[0]) == 0:
          vim.eval('getchar(1)')
        body = s.recv(8192)
        if re.search("=> $", body) != None:
          raise Exception("not an nREPL server: upgrade to Leiningen 2")
        buffer += body
        if string.find(body, '6:statusl4:done') != -1:
          break
      fireplace_let('out', buffer)
    except Exception, e:
      fireplace_let('err', str(e))
  finally:
    s.close()
EOF

function! s:nrepl_call(payload) dict abort
  let payload = nrepl#fireplace_connection#bencode(a:payload)
  python << EOF
fireplace_repl_interact()
EOF
  if !exists('err')
    return nrepl#fireplace_connection#bdecode('l'.out.'e')
  endif
  throw 'nREPL Connection Error: '.err
endfunction

" vim:set et sw=2: