#! /usr/bin/env python3

"Remote RCS -- command line interface"

import sys
import os
import getopt
import string
import md5
import tempfile
from rcsclient import openrcsclient

def main():
    sys.stdout = sys.stderr
    try:
        opts, rest = getopt.getopt(sys.argv[1:], 'h:p:d:qvL')
        if not rest:
            cmd = 'head'
        else:
            cmd, rest = rest[0], rest[1:]
        if cmd not in commands:
            raise getopt.error("unknown command")
        coptset, func = commands[cmd]
        copts, files = getopt.getopt(rest, coptset)
    except getopt.error as msg:
        print(msg)
        print("usage: rrcs [options] command [options] [file] ...")
        print("where command can be:")
        print("      ci|put      # checkin the given files")
        print("      co|get      # checkout")
        print("      info        # print header info")
        print("      head        # print revision of head branch")
        print("      list        # list filename if valid")
        print("      log         # print full log")
        print("      diff        # diff rcs file and work file")
        print("if no files are given, all remote rcs files are assumed")
        sys.exit(2)
    x = openrcsclient(opts)
    if not files:
        files = x.listfiles()
    for fn in files:
        try:
            func(x, copts, fn)
        except (IOError, os.error) as msg:
            print("%s: %s" % (fn, msg))

def checkin(x, copts, fn):
    f = open(fn)
    data = f.read()
    f.close()
    new = not x.isvalid(fn)
    if not new and same(x, copts, fn, data):
        print("%s: unchanged since last checkin" % fn)
        return
    print("Checking in", fn, "...")
    message = asklogmessage(new)
    messages = x.put(fn, data, message)
    if messages:
        print(messages)

def checkout(x, copts, fn):
    data = x.get(fn)
    f = open(fn, 'w')
    f.write(data)
    f.close()

def lock(x, copts, fn):
    x.lock(fn)

def unlock(x, copts, fn):
    x.unlock(fn)

def info(x, copts, fn):
    info_dict = x.info(fn)
    for key in sorted(info_dict.keys()):
        print(key + ':', info_dict[key])
    print('='*70)

def head(x, copts, fn):
    head = x.head(fn)
    print(fn, head)

def list(x, copts, fn):
    if x.isvalid(fn):
        print(fn)

def log(x, copts, fn):
    flags = ''
    for o, a in copts:
        flags = flags + ' ' + o + a
    flags = flags[1:]
    messages = x.log(fn, flags)
    print(messages)

def diff(x, copts, fn):
    if same(x, copts, fn):
        return
    flags = ''
    for o, a in copts:
        flags = flags + ' ' + o + a
    flags = flags[1:]
    data = x.get(fn)
    tf = tempfile.NamedTemporaryFile()
    tf.write(data)
    tf.flush()
    print('diff %s -r%s %s' % (flags, x.head(fn), fn))
    sts = os.system('diff %s %s %s' % (flags, tf.name, fn))
    if sts:
        print('='*70)

def same(x, copts, fn, data = None):
    if data is None:
        f = open(fn)
        data = f.read()
        f.close()
    lsum = md5.new(data).digest()
    rsum = x.sum(fn)
    return lsum == rsum

def asklogmessage(new):
    if new:
        print("enter description,", end=' ')
    else:
        print("enter log message,", end=' ')
    print("terminate with single '.' or end of file:")
    if new:
        print("NOTE: This is NOT the log message!")
    message = ""
    while 1:
        sys.stderr.write(">> ")
        sys.stderr.flush()
        line = sys.stdin.readline()
        if not line or line == '.\n': break
        message = message + line
    return message

def remove(fn):
    try:
        os.unlink(fn)
    except os.error:
        pass

commands = {
        'ci': ('', checkin),
        'put': ('', checkin),
        'co': ('', checkout),
        'get': ('', checkout),
        'info': ('', info),
        'head': ('', head),
        'list': ('', list),
        'lock': ('', lock),
        'unlock': ('', unlock),
        'log': ('bhLRtd:l:r:s:w:V:', log),
        'diff': ('c', diff),
        }

if __name__ == '__main__':
    main()
