#!/usr/bin/python

#

# Interactive script for sending a collection of Mercurial changesets

# as a series of patch emails.

#

# The series is started off with a "[PATCH 0 of N]" introduction,

# which describes the series as a whole.

#

# Each patch email has a Subject line of "[PATCH M of N] ...", using

# the first line of the changeset description as the subject text.

# The message contains two or three body parts:

#

#   The remainder of the changeset description.

#

#   [Optional] If the diffstat program is installed, the result of

#   running diffstat on the patch.

#

#   The patch itself, as generated by "hg export".

#

# Each message refers to all of its predecessors using the In-Reply-To

# and References headers, so they will show up as a sequence in

# threaded mail and news readers, and in mail archives.

#

# For each changeset, you will be prompted with a diffstat summary and

# the changeset summary, so you can be sure you are sending the right

# changes.

#

# It is best to run this script with the "-n" (test only) flag before

# firing it up "for real", in which case it will use your pager to

# display each of the messages that it would send.

#

# To configure a default mail host, add a section like this to your

# hgrc file:

#

# [smtp]

# host = my_mail_host

# port = 1025

# tls = yes # or omit if not needed

# username = user     # if SMTP authentication required

# password = password # if SMTP authentication required - PLAINTEXT

#

# To configure other defaults, add a section like this to your hgrc

# file:

#

# [patchbomb]

# from = My Name <my@email>

# to = recipient1, recipient2, ...

# cc = cc1, cc2, ...

from email.MIMEMultipart import MIMEMultipart

from email.MIMEText import MIMEText

from mercurial import commands

from mercurial import fancyopts

from mercurial import hg

from mercurial import ui

import os

import popen2

import smtplib

import socket

import sys

import tempfile

import time

try:

    # readline gives raw_input editing capabilities, but is not

    # present on windows

    import readline

except ImportError: pass

def diffstat(patch):

    fd, name = tempfile.mkstemp()

    try:

        p = popen2.Popen3('diffstat -p1 -w79 2>/dev/null > ' + name)

        try:

            for line in patch: print >> p.tochild, line

            p.tochild.close()

            if p.wait(): return

            fp = os.fdopen(fd, 'r')

            stat = []

            for line in fp: stat.append(line.lstrip())

            last = stat.pop()

            stat.insert(0, last)

            stat = ''.join(stat)

            if stat.startswith('0 files'): raise ValueError

            return stat

        except: raise

    finally:

        try: os.unlink(name)

        except: pass

def patchbomb(ui, repo, *revs, **opts):

    def prompt(prompt, default = None, rest = ': ', empty_ok = False):

        if default: prompt += ' [%s]' % default

        prompt += rest

        while True:

            r = raw_input(prompt)

            if r: return r

            if default is not None: return default

            if empty_ok: return r

            ui.warn('Please enter a valid value.\n')

    def confirm(s):

        if not prompt(s, default = 'y', rest = '? ').lower().startswith('y'):

            raise ValueError

    def cdiffstat(summary, patch):

        s = diffstat(patch)

        if s:

            if summary:

                ui.write(summary, '\n')

                ui.write(s, '\n')

            confirm('Does the diffstat above look okay')

        return s

    def makepatch(patch, idx, total):

        desc = []

        node = None

        body = ''

        for line in patch:

            if line.startswith('#'):

                if line.startswith('# Node ID'): node = line.split()[-1]

                continue

            if line.startswith('diff -r'): break

            desc.append(line)

        if not node: raise ValueError

        #body = ('\n'.join(desc[1:]).strip() or

        #        'Patch subject is complete summary.')

        #body += '\n\n\n'

        if opts['diffstat']:

            body += cdiffstat('\n'.join(desc), patch) + '\n\n'

        body += '\n'.join(patch)

        msg = MIMEText(body)

        subj = '[PATCH %d of %d] %s' % (idx, total, desc[0].strip())

        if subj.endswith('.'): subj = subj[:-1]

        msg['Subject'] = subj

        msg['X-Mercurial-Node'] = node

        return msg

    start_time = int(time.time())

    def genmsgid(id):

        return '<%s.%s@%s>' % (id[:20], start_time, socket.getfqdn())

    patches = []

    class exportee:

        def __init__(self, container):

            self.lines = []

            self.container = container

            self.name = 'email'

        def write(self, data):

            self.lines.append(data)

        def close(self):

            self.container.append(''.join(self.lines).split('\n'))

            self.lines = []

    commands.export(ui, repo, *args, **{'output': exportee(patches),

                                        'text': None})

    jumbo = []

    msgs = []

    ui.write('This patch series consists of %d patches.\n\n' % len(patches))

    for p, i in zip(patches, range(len(patches))):

        jumbo.extend(p)

        msgs.append(makepatch(p, i + 1, len(patches)))

    ui.write('\nWrite the introductory message for the patch series.\n\n')

    sender = (opts['from'] or ui.config('patchbomb', 'from') or

              prompt('From', ui.username()))

    msg = MIMEMultipart()

    msg['Subject'] = '[PATCH 0 of %d] %s' % (

        len(patches),

        opts['subject'] or

        prompt('Subject:', rest = ' [PATCH 0 of %d] ' % len(patches)))

    def getaddrs(opt, prpt, default = None):

        addrs = opts[opt] or (ui.config('patchbomb', opt) or

                              prompt(prpt, default = default)).split(',')

        return [a.strip() for a in addrs if a.strip()]

    to = getaddrs('to', 'To')

    cc = getaddrs('cc', 'Cc', '')

    ui.write('Finish with ^D or a dot on a line by itself.\n\n')

    body = []

    while True:

        try: l = raw_input()

        except EOFError: break

        if l == '.': break

        body.append(l)

    msg.attach(MIMEText('\n'.join(body) + '\n'))

    ui.write('\n')

    if opts['diffstat']:

        d = cdiffstat('Final summary:\n', jumbo)

        if d: msg.attach(MIMEText(d))

    msgs.insert(0, msg)

    if not opts['test']:

        s = smtplib.SMTP()

        s.connect(host = ui.config('smtp', 'host', 'mail'),

                  port = int(ui.config('smtp', 'port', 25)))

        if ui.configbool('smtp', 'tls'):

            s.ehlo()

            s.starttls()

            s.ehlo()

        username = ui.config('smtp', 'username')

        password = ui.config('smtp', 'password')

        if username and password:

            s.login(username, password)

    parent = None

    tz = time.strftime('%z')

    for m in msgs:

        try:

            m['Message-Id'] = genmsgid(m['X-Mercurial-Node'])

        except TypeError:

            m['Message-Id'] = genmsgid('patchbomb')

        if parent:

            m['In-Reply-To'] = parent

        else:

            parent = m['Message-Id']

        m['Date'] = time.strftime('%a, %e %b %Y %T ', time.localtime(start_time)) + tz

        start_time += 1

        m['From'] = sender

        m['To'] = ', '.join(to)

        if cc: m['Cc'] = ', '.join(cc)

        ui.status('Sending ', m['Subject'], ' ...\n')

        if opts['test']:

            fp = os.popen(os.getenv('PAGER', 'more'), 'w')

            fp.write(m.as_string(0))

            fp.write('\n')

            fp.close()

        else:

            s.sendmail(sender, to + cc, m.as_string(0))

    if not opts['test']:

        s.close()

if __name__ == '__main__':

    optspec = [('c', 'cc', [], 'email addresses of copy recipients'),

               ('d', 'diffstat', None, 'add diffstat output to messages'),

               ('f', 'from', '', 'email address of sender'),

               ('n', 'test', None, 'print messages that would be sent'),

               ('s', 'subject', '', 'subject of introductory message'),

               ('t', 'to', [], 'email addresses of recipients')]

    options = {}

    try:

        args = fancyopts.fancyopts(sys.argv[1:], commands.globalopts + optspec,

                                   options)

    except fancyopts.getopt.GetoptError, inst:

        u = ui.ui()

        u.warn('error: %s' % inst)

        sys.exit(1)

    u = ui.ui(options["verbose"], options["debug"], options["quiet"],

              not options["noninteractive"])

    repo = hg.repository(ui = u)

    patchbomb(u, repo, *args, **options)