$ cat > $TESTTMP/filter.py <<EOF

  > import io

  > import re

  > import sys

  > sys.stdout = io.TextIOWrapper(

  >     sys.stdout.buffer,

  >     sys.stdout.encoding,

  >     sys.stdout.errors,

  >     newline="\n",

  >     line_buffering=sys.stdout.line_buffering,

  > )

  > print(re.sub("\n[ \t]", " ", sys.stdin.read()), end="")

  > EOF

  $ cat <<EOF >> $HGRCPATH

  > [experimental]

  > evolution = true

  > 

  > [extensions]

  > notify=

  > strip=

  > 

  > [phases]

  > publish=False

  > 

  > [hooks]

  > incoming.notify = python:hgext.notify.hook

  > 

  > [notify]

  > sources = pull

  > diffstat = False

  > reply-to-predecessor = True

  > messageidseed = notifyseed

  > 

  > [usersubs]

  > foo@bar = *

  > 

  > [reposubs]

  > * = baz

  > EOF

  $ hg help notify

  notify extension - 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 patterns

    user@host = pattern

    [reposubs]

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

    pattern = user@host

  A "pattern" is a "glob" matching the absolute path to a repository, optionally

  combined with a revset expression. A revset expression, if present, is

  separated from the glob by a hash. Example:

    [reposubs]

    */widgets#branch(release) = qa-team@example.com

  This sends to "qa-team@example.com" whenever a changeset on the "release"

  branch triggers a notification in any repository ending in "widgets".

  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. It is

    also used for the domain part of the "Message-Id" when using

    "notify.messageidseed".

  notify.messageidseed

    Create deterministic "Message-Id" headers for the mails based on the seed

    and the revision identifier of the first commit in the changeset.

  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.maxdiffstat

    Maximum number of diffstat lines to include in notification email. Set to -1

    to include all of it. Default: -1.

  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.showfunc

    If set, override "diff.showfunc" for the diff content. Default: None.

  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.

  notify.reply-to-predecessor (EXPERIMENTAL)

    If set and the changeset has a predecessor in the repository, try to thread

    the notification mail with the predecessor. This adds the "In-Reply-To"

    header to the notification mail with a reference to the predecessor with the

    smallest revision number. Mail threads can still be torn, especially when

    changesets are folded.

    This option must  be used in combination with "notify.messageidseed".

  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".

  no commands defined

  $ hg init a

  $ echo a > a/a

  $ echo b > a/b

commit

  $ hg --cwd a commit -Ama -d '0 0'

  adding a

  adding b

clone

  $ hg --traceback clone a b

  updating to branch default

  2 files updated, 0 files merged, 0 files removed, 0 files unresolved

  $ echo a >> a/a

  $ echo b >> a/b

commit

  $ hg --traceback --cwd a commit -Amb -d '1 0'

on Mac OS X 10.5 the tmp path is very long so would get stripped in the subject line

  $ cat <<EOF >> $HGRCPATH

  > [notify]

  > maxsubject = 200

  > EOF

the python call below wraps continuation lines, which appear on Mac OS X 10.5 because

of the very long subject line

pull (minimal config)

  $ hg --traceback --cwd b --config notify.domain=example.com --config notify.messageidseed=example pull ../a | \

  >  "$PYTHON" $TESTDIR/unwrap-message-id.py | \

  >  "$PYTHON" $TESTTMP/filter.py

  pulling from ../a

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 2 changes to 2 files

  new changesets 00a13f371396 (1 drafts)

  MIME-Version: 1.0

  Content-Type: text/plain; charset="us-ascii"

  Content-Transfer-Encoding: 7bit

  Date: * (glob)

  Subject: changeset in $TESTTMP/b: b

  From: test@example.com

  X-Hg-Notification: changeset 00a13f371396

  Message-Id: <hg.ba3098a36bd4c297288d16788623a841f81f618ea961a0f0fd65de7eb1191b66@example.com>

  To: baz@example.com, foo@bar

  changeset 00a13f371396 in $TESTTMP/b

  details: $TESTTMP/b?cmd=changeset;node=00a13f371396

  description: b

  diffs (12 lines):

  diff -r 0cd96de13884 -r 00a13f371396 a

  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  +++ b/a	Thu Jan 01 00:00:01 1970 +0000

  @@ -1,1 +1,2 @@ a

  +a

  diff -r 0cd96de13884 -r 00a13f371396 b

  --- a/b	Thu Jan 01 00:00:00 1970 +0000

  +++ b/b	Thu Jan 01 00:00:01 1970 +0000

  @@ -1,1 +1,2 @@ b

  +b

  (run 'hg update' to get a working copy)

  $ cat <<EOF >> $HGRCPATH

  > [notify]

  > config = `pwd`/.notify.conf

  > domain = test.com

  > strip = 42

  > template = Subject: {desc|firstline|strip}\nFrom: {author}\nX-Test: foo\n\nchangeset {node|short} in {webroot}\ndescription:\n\t{desc|tabindent|strip}

  > 

  > [web]

  > baseurl = http://test/

  > EOF

fail for config file is missing

  $ hg --cwd b rollback

  repository tip rolled back to revision 0 (undo pull)

  $ hg --cwd b pull ../a 2>&1 | grep 'error.*\.notify\.conf' > /dev/null && echo pull failed

  pull failed

  $ touch ".notify.conf"

pull

  $ hg --cwd b rollback

  repository tip rolled back to revision 0 (undo pull)

  $ hg --traceback --cwd b pull ../a | \

  >  "$PYTHON" $TESTDIR/unwrap-message-id.py | \

  >  "$PYTHON" $TESTTMP/filter.py

  pulling from ../a

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 2 changes to 2 files

  new changesets 00a13f371396 (1 drafts)

  MIME-Version: 1.0

  Content-Type: text/plain; charset="us-ascii"

  Content-Transfer-Encoding: 7bit

  X-Test: foo

  Date: * (glob)

  Subject: b

  From: test@test.com

  X-Hg-Notification: changeset 00a13f371396

  Message-Id: <*> (glob)

  To: baz@test.com, foo@bar

  changeset 00a13f371396 in b

  description: b

  diffs (12 lines):

  diff -r 0cd96de13884 -r 00a13f371396 a

  --- a/a	Thu Jan 01 00:00:00 1970 +0000

  +++ b/a	Thu Jan 01 00:00:01 1970 +0000

  @@ -1,1 +1,2 @@ a

  +a

  diff -r 0cd96de13884 -r 00a13f371396 b

  --- a/b	Thu Jan 01 00:00:00 1970 +0000

  +++ b/b	Thu Jan 01 00:00:01 1970 +0000

  @@ -1,1 +1,2 @@ b

  +b

  (run 'hg update' to get a working copy)

  $ cat << EOF >> $HGRCPATH

  > [hooks]

  > incoming.notify = python:hgext.notify.hook

  > 

  > [notify]

  > sources = pull

  > diffstat = True

  > EOF

pull

  $ hg --cwd b rollback

  repository tip rolled back to revision 0 (undo pull)

  $ hg --traceback --config notify.maxdiffstat=1 --cwd b pull ../a | \

  >  "$PYTHON" $TESTDIR/unwrap-message-id.py | \

  >  "$PYTHON" $TESTTMP/filter.py

  pulling from ../a

  searching for changes

  adding changesets

  adding manifests

  adding file changes

  added 1 changesets with 2 changes to 2 files

  new changesets 00a13f371396 (1 drafts)

  MIME-Version: 1.0

  Content-Type: text/plain; charset="us-ascii"

  Content-Transfer-Encoding: 7bit

  X-Test: foo

  Date: * (glob)

  Subject: b

  From: test@test.com

  X-Hg-Notification: changeset 00a13f371396

  Message-Id: <*> (glob)

  To: baz@test.com, foo@bar

  changeset 00a13f371396 in b

  description: b

  diffstat (truncated from 2 to 1 lines):

   a |  1 + 2 files changed, 2 insertions(+), 0 deletions(-)

  diffs (12 lines):

  diff -r 0cd96de13884 -r 00a13f371396 a