Operating on mailing lists¶
withlist) command is a pretty powerful way to
operate on mailing lists from the command line. This command allows you to
interact with a list at a Python prompt, or process one or more mailing lists
through custom made Python functions.
Getting detailed help¶
shell is so complex, you might want to read the detailed help.
>>> from mailman.testing.documentation import cli >>> command = cli('mailman.commands.cli_withlist.shell') >>> command('mailman shell --details') This script provides you with a general framework for interacting with a mailing list. ...
Running a function¶
By putting a Python function somewhere on your
sys.path, you can have
shell call that function on a given mailing list.
>>> from mailman.config import config >>> import os, sys >>> old_path = sys.path[:] >>> sys.path.insert(0, config.VAR_DIR)
The function takes at least a single argument, the mailing list.
>>> with open(os.path.join(config.VAR_DIR, 'showme.py'), 'w') as fp: ... print("""\ ... def showme(mlist): ... print("The list's name is", mlist.fqdn_listname) ... ... def displayname(mlist): ... print("The list's display name is", mlist.display_name) ... ... def changeme(mlist, display_name): ... mlist.display_name = display_name ... """, file=fp)
If the name of the function is the same as the module, then you only need to name the function once.
>>> from mailman.app.lifecycle import create_list >>> mlist = create_list('email@example.com') >>> command('mailman shell -l firstname.lastname@example.org --run showme') The list's name is email@example.com
The function’s name can also be different than the modules name. In that case, just give the full module path name to the function you want to call.
>>> command('mailman shell -l firstname.lastname@example.org --run showme.displayname') The list's display name is Ant
Your function can also accept an arbitrary number of arguments. Every command line argument after the callable name is passed as a positional argument to the function. For example, to change the mailing list’s display name, you can do this:
>>> command('mailman shell -l email@example.com --run showme.changeme ANT!') >>> print(mlist.display_name) ANT!
You can run a command over more than one list by using a regular expression in
listname argument. To indicate a regular expression is used, the
string must start with a caret.
>>> mlist_2 = create_list('firstname.lastname@example.org') >>> mlist_3 = create_list('email@example.com') >>> command('mailman shell --run showme.displayname -l ^.*example.com') The list's display name is ANT! The list's display name is Badboys The list's display name is Badger >>> command('mailman shell --run showme.displayname -l ^bad.*') The list's display name is Badboys The list's display name is Badger >>> command('mailman shell --run showme.displayname -l ^foo')
You can also get an interactive prompt which allows you to inspect a live
Mailman system directly. Through the
mailman.cfg file, you can set the
prompt and banner, and you can choose between the standard Python REPL or
If the GNU readline library is available, it will be enabled automatically,
giving you command line editing and other features. You can also set the
[shell]history_file variable in the
mailman.cfg file and when the
normal Python REPL is used, your interactive commands will be written to and
read from this file.
Note that the
$PYTHONSTARTUP environment variable will also be honored if
set, and any file named by this variable will be read at start up time. It’s
common practice to also enable GNU readline history in a
file and if you do this, be aware that it will interact badly with
[shell]history_file, causing your history to be written twice. To disable
this when using the interactive
shell command, do something like:
$ PYTHONSTARTUP= mailman shell
to temporarily unset the environment variable.