# notify.py - email notifications for mercurial

#

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

'''hooks for sending email push notifications

This extension implements hooks to send email notifications when

changesets are sent from or received by the local repository.

First, enable the extension as explained in :hg:`help extensions`, and

register the hook you want to run. ``incoming`` and ``changegroup`` hooks

are run when changesets are received, while ``outgoing`` hooks are for

changesets sent to another repository::

  [hooks]

  # one email for each incoming changeset

  incoming.notify = python:hgext.notify.hook

  # one email for all incoming changesets

  changegroup.notify = python:hgext.notify.hook

  # one email for all outgoing changesets

  outgoing.notify = python:hgext.notify.hook

This registers the hooks. To enable notification, subscribers must

be assigned to repositories. The ``[usersubs]`` section maps multiple

repositories to a given recipient. The ``[reposubs]`` section maps

multiple recipients to a single repository::

  [usersubs]

  # key is subscriber email, value is a comma-separated list of repo glob

  # patterns

  user@host = pattern

  [reposubs]

  # key is glob pattern, value is a comma-separated list of subscriber

  # emails

  pattern = user@host

Glob patterns are matched against absolute path to repository

root.

In order to place them under direct user management, ``[usersubs]`` and

``[reposubs]`` sections may be placed in a separate ``hgrc`` file and

incorporated by reference::

  [notify]

  config = /path/to/subscriptionsfile

Notifications will not be sent until the ``notify.test`` value is set

to ``False``; see below.

Notifications content can be tweaked with the following configuration entries:

notify.test

  If ``True``, print messages to stdout instead of sending them. Default: True.

notify.sources

  Space-separated list of change sources. Notifications are activated only

  when a changeset's source is in this list. Sources may be:

  :``serve``: changesets received via http or ssh

  :``pull``: changesets received via ``hg pull``

  :``unbundle``: changesets received via ``hg unbundle``

  :``push``: changesets sent or received via ``hg push``

  :``bundle``: changesets sent via ``hg unbundle``

  Default: serve.

notify.strip

  Number of leading slashes to strip from url paths. By default, notifications

  reference repositories with their absolute path. ``notify.strip`` lets you

  turn them into relative paths. For example, ``notify.strip=3`` will change

  ``/long/path/repository`` into ``repository``. Default: 0.

notify.domain

  Default email domain for sender or recipients with no explicit domain.

notify.style

  Style file to use when formatting emails.

notify.template

  Template to use when formatting emails.

notify.incoming

  Template to use when run as an incoming hook, overriding ``notify.template``.

notify.outgoing

  Template to use when run as an outgoing hook, overriding ``notify.template``.

notify.changegroup

  Template to use when running as a changegroup hook, overriding

  ``notify.template``.

notify.maxdiff

  Maximum number of diff lines to include in notification email. Set to 0

  to disable the diff, or -1 to include all of it. Default: 300.

notify.maxsubject

  Maximum number of characters in email's subject line. Default: 67.

notify.diffstat

  Set to True to include a diffstat before diff content. Default: True.

notify.merge

  If True, send notifications for merge changesets. Default: True.

notify.mbox

  If set, append mails to this mbox file instead of sending. Default: None.

notify.fromauthor

  If set, use the committer of the first changeset in a changegroup for

  the "From" field of the notification mail. If not set, take the user

  from the pushing repo.  Default: False.

If set, the following entries will also be used to customize the

notifications:

email.from

  Email ``From`` address to use if none can be found in the generated

  email content.

web.baseurl

  Root repository URL to combine with repository paths when making

  references. See also ``notify.strip``.

'''

from mercurial.i18n import _

from mercurial import patch, cmdutil, templater, util, mail

import email.Parser, email.Errors, fnmatch, socket, time

testedwith = 'internal'

# template for single changeset can include email headers.

single_template = '''

Subject: changeset in {webroot}: {desc|firstline|strip}

From: {author}

changeset {node|short} in {root}

details: {baseurl}{webroot}?cmd=changeset;node={node|short}

description:

\t{desc|tabindent|strip}

'''.lstrip()

# template for multiple changesets should not contain email headers,

# because only first set of headers will be used and result will look

# strange.

multiple_template = '''

changeset {node|short} in {root}

details: {baseurl}{webroot}?cmd=changeset;node={node|short}

summary: {desc|firstline}

'''

deftemplates = {

    'changegroup': multiple_template,

}

class notifier(object):

    '''email notification class.'''

    def __init__(self, ui, repo, hooktype):

        self.ui = ui

        cfg = self.ui.config('notify', 'config')

        if cfg:

            self.ui.readconfig(cfg, sections=['usersubs', 'reposubs'])

        self.repo = repo

        self.stripcount = int(self.ui.config('notify', 'strip', 0))

        self.root = self.strip(self.repo.root)

        self.domain = self.ui.config('notify', 'domain')

        self.mbox = self.ui.config('notify', 'mbox')

        self.test = self.ui.configbool('notify', 'test', True)

        self.charsets = mail._charsets(self.ui)

        self.subs = self.subscribers()

        self.merge = self.ui.configbool('notify', 'merge', True)

        mapfile = self.ui.config('notify', 'style')

        template = (self.ui.config('notify', hooktype) or

                    self.ui.config('notify', 'template'))

        self.t = cmdutil.changeset_templater(self.ui, self.repo,

                                             False, None, mapfile, False)

        if not mapfile and not template:

            template = deftemplates.get(hooktype) or single_template

        if template:

            template = templater.parsestring(template, quoted=False)

            self.t.use_template(template)

    def strip(self, path):

        '''strip leading slashes from local path, turn into web-safe path.'''

        path = util.pconvert(path)

        count = self.stripcount

        while count > 0:

            c = path.find('/')

            if c == -1:

                break

            path = path[c + 1:]

            count -= 1

        return path

    def fixmail(self, addr):

        '''try to clean up email addresses.'''

        addr = util.email(addr.strip())

        if self.domain:

            a = addr.find('@localhost')

            if a != -1:

                addr = addr[:a]

            if '@' not in addr:

                return addr + '@' + self.domain

        return addr

    def subscribers(self):

        '''return list of email addresses of subscribers to this repo.'''

        subs = set()

        for user, pats in self.ui.configitems('usersubs'):

            for pat in pats.split(','):

                if fnmatch.fnmatch(self.repo.root, pat.strip()):

                    subs.add(self.fixmail(user))

        for pat, users in self.ui.configitems('reposubs'):

            if fnmatch.fnmatch(self.repo.root, pat):

                for user in users.split(','):

                    subs.add(self.fixmail(user))

        return [mail.addressencode(self.ui, s, self.charsets, self.test)

                for s in sorted(subs)]

    def node(self, ctx, **props):

        '''format one changeset, unless it is a suppressed merge.'''

        if not self.merge and len(ctx.parents()) > 1:

            return False

        self.t.show(ctx, changes=ctx.changeset(),

                    baseurl=self.ui.config('web', 'baseurl'),

                    root=self.repo.root, webroot=self.root, **props)

        return True

    def skipsource(self, source):

        '''true if incoming changes from this source should be skipped.'''

        ok_sources = self.ui.config('notify', 'sources', 'serve').split()

        return source not in ok_sources

    def send(self, ctx, count, data):

        '''send message.'''

        p = email.Parser.Parser()

        try:

            msg = p.parsestr(data)

        except email.Errors.MessageParseError, inst:

            raise util.Abort(inst)

        # store sender and subject

        sender, subject = msg['From'], msg['Subject']

        del msg['From'], msg['Subject']

        if not msg.is_multipart():

            # create fresh mime message from scratch

            # (multipart templates must take care of this themselves)

            headers = msg.items()

            payload = msg.get_payload()

            # for notification prefer readability over data precision

            msg = mail.mimeencode(self.ui, payload, self.charsets, self.test)

            # reinstate custom headers

            for k, v in headers:

                msg[k] = v

        msg['Date'] = util.datestr(format="%a, %d %b %Y %H:%M:%S %1%2")

        # try to make subject line exist and be useful

        if not subject:

            if count > 1:

                subject = _('%s: %d new changesets') % (self.root, count)

            else:

                s = ctx.description().lstrip().split('\n', 1)[0].rstrip()

                subject = '%s: %s' % (self.root, s)

        maxsubject = int(self.ui.config('notify', 'maxsubject', 67))

        if maxsubject:

            subject = util.ellipsis(subject, maxsubject)

        msg['Subject'] = mail.headencode(self.ui, subject,

                                         self.charsets, self.test)

        # try to make message have proper sender

        if not sender:

            sender = self.ui.config('email', 'from') or self.ui.username()

        if '@' not in sender or '@localhost' in sender:

            sender = self.fixmail(sender)

        msg['From'] = mail.addressencode(self.ui, sender,

                                         self.charsets, self.test)

        msg['X-Hg-Notification'] = 'changeset %s' % ctx

        if not msg['Message-Id']:

            msg['Message-Id'] = ('<hg.%s.%s.%s@%s>' %

                                 (ctx, int(time.time()),

                                  hash(self.repo.root), socket.getfqdn()))

        msg['To'] = ', '.join(self.subs)

        msgtext = msg.as_string()

        if self.test:

            self.ui.write(msgtext)

            if not msgtext.endswith('\n'):

                self.ui.write('\n')

        else:

            self.ui.status(_('notify: sending %d subscribers %d changes\n') %

                           (len(self.subs), count))

            mail.sendmail(self.ui, util.email(msg['From']),

                          self.subs, msgtext, mbox=self.mbox)

    def diff(self, ctx, ref=None):

        maxdiff = int(self.ui.config('notify', 'maxdiff', 300))

        prev = ctx.p1().node()

        ref = ref and ref.node() or ctx.node()

        chunks = patch.diff(self.repo, prev, ref, opts=patch.diffopts(self.ui))

        difflines = ''.join(chunks).splitlines()

        if self.ui.configbool('notify', 'diffstat', True):

            s = patch.diffstat(difflines)

            # s may be nil, don't include the header if it is

            if s:

                self.ui.write('\ndiffstat:\n\n%s' % s)

        if maxdiff == 0:

            return

        elif maxdiff > 0 and len(difflines) > maxdiff:

            msg = _('\ndiffs (truncated from %d to %d lines):\n\n')

            self.ui.write(msg % (len(difflines), maxdiff))

            difflines = difflines[:maxdiff]

        elif difflines:

            self.ui.write(_('\ndiffs (%d lines):\n\n') % len(difflines))

        self.ui.write("\n".join(difflines))

def hook(ui, repo, hooktype, node=None, source=None, **kwargs):

    '''send email notifications to interested subscribers.

    if used as changegroup hook, send one email for all changesets in

    changegroup. else send one email per changeset.'''

    n = notifier(ui, repo, hooktype)

    ctx = repo[node]

    if not n.subs:

        ui.debug('notify: no subscribers to repository %s\n' % n.root)

        return

    if n.skipsource(source):

        ui.debug('notify: changes have source "%s" - skipping\n' % source)

        return

    ui.pushbuffer()

    data = ''

    count = 0

    author = ''

    if hooktype == 'changegroup' or hooktype == 'outgoing':

        start, end = ctx.rev(), len(repo)

        for rev in xrange(start, end):

            if n.node(repo[rev]):

                count += 1

                if not author:

                    author = repo[rev].user()

            else:

                data += ui.popbuffer()

                ui.note(_('notify: suppressing notification for merge %d:%s\n')

                        % (rev, repo[rev].hex()[:12]))

                ui.pushbuffer()

        if count:

            n.diff(ctx, repo['tip'])

    else:

        if not n.node(ctx):

            ui.popbuffer()

            ui.note(_('notify: suppressing notification for merge %d:%s\n') %

                    (ctx.rev(), ctx.hex()[:12]))

            return

        count += 1

        n.diff(ctx)

    data += ui.popbuffer()