Emacs tools and glue for working with public-inbox archives


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piem

This manual is for piem version 0.5.0.

Table of Contents


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1 Overview

piem is a collection of Emacs libraries for working with public-inbox archives. As much of the hard work here is already done by other Emacs libraries—things like mail clients, news readers, Git interfaces, and even web browsers—piem is mostly about bridging some of these parts for convenience.


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1.1 public-inbox

public-inbox is software for archiving public mailing lists. Archives can be exposed over HTTP. As examples, https://public-inbox.org/meta serves public-inbox’s own mailing list, and https://lore.kernel.org/lists.html hosts the archives of many Linux development mailing lists.

These web archives are good for searching, particularly if you don’t have all of the list’s messages on your local machine, or for linking to a message. On the other hand, the web interface isn’t convenient when you want to follow new activity on a list. To do that, you could of course subscribe to the mailing list, but public-inbox offers a few “pull methods” that you can use instead:

  • an atom feed for the list as a whole or for specific searches
  • read-only NNTP
  • read-only IMAP (new in upcoming public-inbox v1.6.0)

Finally, archives are exposed as one or more Git repositories, facilitating replication (see https://public-inbox.org/reproducibility.html). For example, you can clone the mailing list archives of ‘git.vger.kernel.org’ with

git clone --mirror https://lore.kernel.org/git/0 git/git/0.git

After the initial clone, new messages can be retrieved with git fetch. Unsurprisingly git log is not a pleasant way to read a mailing list; instead this method is useful for mirroring the archive or bulk importing of the messages. (See https://public-inbox.org/clients.html for a list of some tools designed to work with public-inbox archives.)


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2 Getting started

piem-dispatch transient (see https://magit.vc/manual/transient/) provides an entry point to piem commands. It’s recommended to bind piem-dispatch to a key. However, before most of those commands do anything useful, you need to register inboxes and activate at least one minor mode.


2.1 Registering inboxes

A public-inbox archive, referred to as an inbox, is registered by adding an entry to piem-inboxes. Here’s an example entry for the Git project’s mailing list:

("git"
 :url "https://lore.kernel.org/git/"
 :address "git@vger.kernel.org"
 :listid "git.vger.kernel.org"
 :coderepo "~/src/git/")

The first element is a name for the inbox and will typically match the name at the end of the :url value. Specifying either :listid or :address is important so that a message in a buffer can be mapped to an inbox in piem-inboxes.

:coderepo points to the working tree of a local Git repository that contains code related to that archive (in the example above, a local clone of https://git.kernel.org/pub/scm/git/git.git/). This information is required to apply patches from an archive to a local code repository (see Applying patches). To map an inbox to more than one repository (e.g., if the inbox receives patches for multiple projects, or if you use a few dedicated Git worktrees for different types of patches), set :coderepo to a list of locations.

When using the Debbugs instance at https://bugs.gnu.org to retrieve messages, an inbox can mapped to each message by setting :gnu-package for an inbox.

If you mirror some inboxes locally (e.g., for fast local access or for use with lei), you don’t need to duplicate the information from your public-inbox configuration (public-inbox-config(5)). When the option piem-get-inboxes-from-config is non-nil, the function piem-merged-inboxes, which all code should use for accessing the registered inboxes, returns a combined set of inboxes derived from piem-inboxes and public-inbox’s configuration. Merging is done at the level of inbox properties (e.g., an inbox’s URL may be defined in piem-inboxes and the inbox’s address in public-inbox’s configuration). When a value is defined in both sources, the one in piem-inboxes takes precedence.

Properties described for piem-inboxes are constructed by mapping

[publicinbox $inbox]
$name = $value

to

  ($inbox :$name $value ...)

The one exception is :coderepo. In public-inbox’s configuration, the value of publicinbox.$inbox.coderepo points to another configuration option, coderepo.$value.dir, which in turn points to a repository’s git directory. The :coderepo of piem-inboxes, however, should be set to the working tree, so :coderepo is derived from the value of coderepo.$value.dir, stripping a trailing /.git if present.

Note that piem-merged-inboxes reads from the public-inbox configuration once, generates the merged set of inboxes, and then caches the result. If you change piem-inboxes outside the customize interface or change public-inbox’s configuration, you need to call the command piem-clear-merged-inboxes to clear the cache.


2.2 Enabling integration libraries

With inboxes defined, the next step is to enable minor modes that teach particular Emacs modes to link a buffer with a registered inbox. piem currently has libraries to support

  • Debbugs
  • EWW
  • Elfeed
  • Gnus
  • Notmuch
  • Rmail

For example, if you use notmuch.el to read your mail, you can add support for applying patches from a Notmuch message buffer by enabling piem-notmuch-mode (see Applying patches):

(piem-notmuch-mode 1)

Help adding support for other modes, especially other mail clients, is welcome.


3 Applying patches

With piem-inboxes configured and appropriate integration libraries enabled, a buffer that can be linked to an inbox can be mapped to a code repository. When reading a message in a notmuch-show-mode buffer, for example, the list ID can be used to identify the inbox and thus the associated local code repository.

There are two commands for applying patches:

piem-am

This command tries to extract a patch from the current Notmuch or Gnus message buffer and can handle an inline patch as well as one or more patch attachments.

piem-b4-am

This command relies on the b4 command-line tool to do more sophisticated processing of the full thread (e.g., pulling out the latest reroll of a series) to generate an mbox that can be fed to git am. It is only compatible with inline patches.


3.1 Applying patches contained in a message

M-x piem-am RET branch RET base

Apply the patch or patches in the current buffer to the associated code repository. Before applying, check out a new branch branch starting at base.

Calling piem-edit instead of piem-am will pop up an am-ready mbox for editing. To feed the edited mbox to piem-am, invoke piem-edit-patch-am (C-c C-c).

You’ll be queried for the name of the new branch. The default name offered is generated by piem-name-branch-who-what-v, which uses the ‘From:’ and ‘Subject:’ headers to construct branch names like ‘km/b4-short-subj__v3’. To use a different function to generate the completion default, configure piem-default-branch-function.

Next you’ll be queried for the base to use as the starting point for the branch. If the sender specified a base commit for the series, that will be provided as the default completion candidate. Entering an empty base signals to use the current branch of the repository as the base.

Rather than applying the patches directly to the associated code repository, you can create a dedicated worktree by setting piem-am-create-worktree to a non-nil value. Giving a prefix argument to piem-am inverts the meaning of piem-am-create-worktree; that is, by default a prefix argument is useful if you generally prefer to work within the configured code repository but would like to trigger the one-off creation of a worktree for a particular call.

If the piem-use-magit option is non-nil (the default) and Magit is loaded, piem uses Magit for some operations, particularly those that are user-facing. This includes jumping to the Magit status buffer for a code repository after applying a patch.

Note that the piem-am command works only for buffers from which piem-am-ready-mbox can generate an am-ready mbox, which depends on the enabled integration libraries. Currently piem-notmuch and piem-gnus implement the necessary functionality.


3.2 Using b4 to apply patches

b4 is a command-line tool for interacting with public-inbox archives. While useful for public-inbox archives in general, it is written for Linux kernel development and focuses on the public-inbox archives hosted at https://lore.kernel.org.

It’s a fast moving target at the moment, but some of its current capabilities include

  • downloading the mbox for a thread based on a given message ID
  • extracting patches from a thread’s mbox that can be fed to git am
  • submitting and verifying cryptographic attestation for patches
  • fetching a pull request found in a message ID
  • generating a thanks email for patches

The second item is the focus for piem, though at least some degree of support for all of the above features will likely be added. The entry point to applying patches with b4 is the piem-b4-am transient. (See https://magit.vc/manual/transient/ for more information on using Transient.)

piem-b4-am offers the following actions:

a
M-x piem-b4-am-from-mid

Generate or download a thread’s mbox for the current buffer’s message ID, process it into an am-ready mbox with b4, and then feed it to git am called within an associated Git repository. If a message ID of the current buffer is not known (i.e. piem-mid returns nil), one is read from the caller. The caller is also queried for the branch name and base, as described for piem-am (see Applying patches contained in a message). And, as with piem-am, a worktree can be created by configuring piem-am-create-worktree to a non-nil value or by giving a prefix argument.

To generate the input thread, first any functions in piem-mid-to-thread-functions are tried. This allows for a thread to be retrieved from a local store (e.g., the Notmuch database). If that fails, try to download the thread from the piem-inboxes URL associated with the current buffer, provided the current buffer’s message ID matches the one piem-b4-am-from-mid was called with. As a last resort, call b4 am without a local mbox to let it download the thread according to its own configuration.

i
M-x piem-b4-am-ready-from-mid

Call b4 am with a given message ID. This differs from piem-b4-am-from-mid in that it is a direct wrapper around a command-line call to b4 am. The caller is always queried for the message ID, and the final product is an am-ready mbox. b4 is responsible for downloading the thread, so the caller must point b4’s configuration option b4.midmask to the appropriate public-inbox URL.

b
M-x piem-b4-am-ready-from-mbox

Like piem-b4-am-ready-from-mid, but process a local mbox rather than identifying the thread based on the specified message ID.


3.3 Applying patches without a public-inbox archive

Much of the functionality described in the previous sections can work even if messages aren’t available in a public-inbox archive. piem-am and piem-b4-am-from-mid try to generate the am-ready mbox from a local source (e.g., via Notmuch or Gnus) before falling back to downloading the thread from a public-inbox archive.

Also, for those not working with public-inbox archives, it’s worth checking out mailscripts, a nice set of Debian-focused tools by Sean Whitton that provides, among other things, functionality for applying patch series, including b4-inspired patch extraction.

If you would like to use piem but prefer to use mailscripts’ notmuch-extract-patch script rather than b4 to prepare an am-ready mbox, you can add the piem-notmuch-extract-patch-am-ready-mbox function to piem-am-ready-mbox-functions.


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4 Miscellaneous functionality


4.1 Injecting messages into a Maildir directory

public-inbox allows you to follow lists through several mechanisms (see public-inbox). You may prefer different methods for different projects depending on things like how actively you are following the development and how high traffic the list is. For a project you maintain, perhaps you want to receive every message as regular mail. For a project you actively follow and occasionally contribute to, you may prefer to not clutter your local mail store and instead follow via read-only NNTP or IMAP in Gnus (which may or may not be your MUA). And for a project you’re new to or are digging into for a particular reason, HTTP via EWW may be all you need.

Depending on your mail setup, a problem with this approach is that it can be inconvenient to start participating in a thread that you aren’t reading in your regular MUA (e.g., if you use notmuch.el to read your regular mail but are following a project via NNTP in Gnus). In this case, you can use the command piem-inject-thread-into-maildir to move the thread’s messages into a local Maildir directory specified by the current inbox’s :maildir value in piem-inboxes, falling back to piem-maildir-directory. By default the command downloads the entire thread for the message ID associated with the current buffer. A prefix argument restricts the download to only the message.

After the messages are injected, each function in piem-after-mail-injection-functions is called with the message ID that was used to identify the thread. This can be used to pop to the message in your mail client. For example, Notmuch users may want something like this:

(defun my/notmuch-new-and-show (mid)
  (message "Running notmuch new")
  (call-process notmuch-command nil nil nil "new")
  (notmuch-show (concat "id:"  mid)))

(add-hook 'piem-after-mail-injection-functions
          #'my/notmuch-new-and-show)

To prevent duplicate messages from being written on subsequent calls to piem-inject-thread-into-maildir, you can set piem-mail-injection-skipif-predicate to a function that returns non-nil if a message ID is known and should be skipped. For Notmuch, piem-notmuch provides a function that works for this purpose, piem-notmuch-known-mid-p:

(setq piem-mail-injection-skipif-predicate
      #'piem-notmuch-known-mid-p)

4.2 Copying public-inbox URLs

When referring to a message from a public-inbox archive, a common format to use is a URL that points to a specific archive and ends with /$INBOX/$MESSAGE_ID, e.g., https://public-inbox.org/meta/20190108015420.GA28903@dcvr. Calling piem-copy-mid-url (available in the piem-dispatch transient) constructs such a URL, using the message ID and inbox asscociated with the current buffer, and then copies the URL to the kill ring. When a prefix agument is given, browse-url is called after copying the URL.

Note that EWW works nicely with public-inbox’s HTTP interface. If you’d prefer it to be invoked even though it’s not your default browser (as configured by browse-url-browser-function), you can set piem-browse-url-browser-function to eww-browse-url.

For notmuch.el users, there’s an additional entry point for copying public-inbox URLs: enabling piem-notmuch-mode adds a “piem” candidate to archives offered by notmuch-show-stash-mlarchive-link and notmuch-show-stash-mlarchive-link-and-go.


5 Contributing

Patches, bug reports, and other feedback are welcome. Please send a plain-text email to piem@inbox.kyleam.com. Messages that include this address are public and available as public-inbox archives at https://inbox.kyleam.com/piem. Note that this is not a mailing list. Updates can be followed through one of public-inbox’s pull methods (see public-inbox). This means it is particularly important to not drop participants when replying.

You can, unsurprisingly, use piem to work on piem by adding an entry like this to piem-inboxes.

("piem"
 :coderepo "<path/to/local/clone>"
 :address "piem@inbox.kyleam.com"
 :url "https://inbox.kyleam.com/piem/")

The source repository is available at https://git.kyleam.com/piem. Here are some guidelines for sending patches:


7 GNU Free Documentation License

Version 1.3, 3 November 2008
Copyright © 2000, 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
http://fsf.org/

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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    Moreover, your license from a particular copyright holder is reinstated permanently if the copyright holder notifies you of the violation by some reasonable means, this is the first time you have received notice of violation of this License (for any work) from that copyright holder, and you cure the violation prior to 30 days after your receipt of the notice.

    Termination of your rights under this section does not terminate the licenses of parties who have received copies or rights from you under this License. If your rights have been terminated and not permanently reinstated, receipt of a copy of some or all of the same material does not give you any rights to use it.

  11. FUTURE REVISIONS OF THIS LICENSE

    The Free Software Foundation may publish new, revised versions of the GNU Free Documentation License from time to time. Such new versions will be similar in spirit to the present version, but may differ in detail to address new problems or concerns. See http://www.gnu.org/copyleft/.

    Each version of the License is given a distinguishing version number. If the Document specifies that a particular numbered version of this License “or any later version” applies to it, you have the option of following the terms and conditions either of that specified version or of any later version that has been published (not as a draft) by the Free Software Foundation. If the Document does not specify a version number of this License, you may choose any version ever published (not as a draft) by the Free Software Foundation. If the Document specifies that a proxy can decide which future versions of this License can be used, that proxy’s public statement of acceptance of a version permanently authorizes you to choose that version for the Document.

  12. RELICENSING

    “Massive Multiauthor Collaboration Site” (or “MMC Site”) means any World Wide Web server that publishes copyrightable works and also provides prominent facilities for anybody to edit those works. A public wiki that anybody can edit is an example of such a server. A “Massive Multiauthor Collaboration” (or “MMC”) contained in the site means any set of copyrightable works thus published on the MMC site.

    “CC-BY-SA” means the Creative Commons Attribution-Share Alike 3.0 license published by Creative Commons Corporation, a not-for-profit corporation with a principal place of business in San Francisco, California, as well as future copyleft versions of that license published by that same organization.

    “Incorporate” means to publish or republish a Document, in whole or in part, as part of another Document.

    An MMC is “eligible for relicensing” if it is licensed under this License, and if all works that were first published under this License somewhere other than this MMC, and subsequently incorporated in whole or in part into the MMC, (1) had no cover texts or invariant sections, and (2) were thus incorporated prior to November 1, 2008.

    The operator of an MMC Site may republish an MMC contained in the site under CC-BY-SA on the same site at any time before August 1, 2009, provided the MMC is eligible for relicensing.

ADDENDUM: How to use this License for your documents

To use this License in a document you have written, include a copy of the License in the document and put the following copyright and license notices just after the title page:

  Copyright (C)  year  your name.
  Permission is granted to copy, distribute and/or modify this document
  under the terms of the GNU Free Documentation License, Version 1.3
  or any later version published by the Free Software Foundation;
  with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
  Texts.  A copy of the license is included in the section entitled ``GNU
  Free Documentation License''.

If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, replace the “with…Texts.” line with this:

    with the Invariant Sections being list their titles, with
    the Front-Cover Texts being list, and with the Back-Cover Texts
    being list.

If you have Invariant Sections without Cover Texts, or some other combination of the three, merge those two alternatives to suit the situation.

If your document contains nontrivial examples of program code, we recommend releasing these examples in parallel under your choice of free software license, such as the GNU General Public License, to permit their use in free software.


Key Index


Next: , Previous: , Up: piem   [Contents][Index]

Variable Index

Jump to:   P  
Index Entry  Section

P
piem-after-mail-injection-functions: Injecting messages into a Maildir directory
piem-am-create-worktree: Applying patches contained in a message
piem-am-create-worktree: Using b4 to apply patches
piem-am-read-worktree-function: Applying patches contained in a message
piem-am-read-worktree-function: Using b4 to apply patches
piem-am-ready-mbox-functions: Applying patches without a public-inbox archive
piem-browse-url-browser-function: Copying public-inbox URLs
piem-default-branch-function: Applying patches contained in a message
piem-get-inboxes-from-config: Registering inboxes
piem-inboxes: Registering inboxes
piem-mail-injection-skipif-predicate: Injecting messages into a Maildir directory
piem-maildir-directory: Injecting messages into a Maildir directory
piem-use-magit: Applying patches contained in a message

Jump to:   P  

Next: , Previous: , Up: piem   [Contents][Index]

Function Index

Jump to:   P  
Index Entry  Section

P
piem-am: Applying patches
piem-am: Applying patches contained in a message
piem-am-ready-mbox: Applying patches contained in a message
piem-b4-am: Applying patches
piem-b4-am: Using b4 to apply patches
piem-b4-am-from-mid: Using b4 to apply patches
piem-b4-am-ready-from-mbox: Using b4 to apply patches
piem-b4-am-ready-from-mid: Using b4 to apply patches
piem-clear-merged-inboxes: Registering inboxes
piem-copy-mid-url: Copying public-inbox URLs
piem-debbugs-mode: Enabling integration libraries
piem-dispatch: Getting started
piem-edit: Applying patches contained in a message
piem-edit-patch-am: Applying patches contained in a message
piem-elfeed-mode: Enabling integration libraries
piem-eww-mode: Enabling integration libraries
piem-gnus-mode: Enabling integration libraries
piem-inject-thread-into-maildir: Injecting messages into a Maildir directory
piem-merged-inboxes: Registering inboxes
piem-mid: Using b4 to apply patches
piem-mid-to-thread-functions: Using b4 to apply patches
piem-name-branch-who-what-v: Applying patches contained in a message
piem-notmuch-extract-patch-am-ready-mbox: Applying patches without a public-inbox archive
piem-notmuch-known-mid-p: Injecting messages into a Maildir directory
piem-notmuch-mode: Enabling integration libraries
piem-notmuch-mode: Copying public-inbox URLs
piem-notmuch-show-get-public-inbox-link: Copying public-inbox URLs
piem-rmail-mode: Enabling integration libraries

Jump to:   P  

Previous: , Up: piem   [Contents][Index]

Concept Index

Jump to:   A   B   C   D   G   I   L   M   P  
Index Entry  Section

A
am-ready mbox: Applying patches
applying patches: Applying patches

B
b4: Using b4 to apply patches

C
coderepo: Registering inboxes

D
Debbugs, issue tracking system: Registering inboxes

G
git-am: Applying patches

I
inbox: Registering inboxes
issue tracking: Registering inboxes

L
lore: public-inbox
lore: Using b4 to apply patches

M
magit: Applying patches contained in a message
magit: Related projects and tools
Maildir: Injecting messages into a Maildir directory
mailscripts: Applying patches without a public-inbox archive
mailscripts: Related projects and tools

P
public-inbox: public-inbox
pull methods: public-inbox

Jump to:   A   B   C   D   G   I   L   M   P