agitate: Extras for diff-mode, vc-git, log-edit, log-view

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agitate: Extras for diff-mode, vc-git, log-edit, log-view

This manual, written by Protesilaos Stavrou, describes the customization options for the Emacs package called ‘agitate’ (or ‘agitate.el’), and provides every other piece of information pertinent to it.

The documentation furnished herein corresponds to stable version 0.0.0, released on N/A. Any reference to a newer feature which does not yet form part of the latest tagged commit, is explicitly marked as such.

Current development target is 0.1.0-dev.

If you are viewing the README.org version of this file, please note that the GNU ELPA machinery automatically generates an Info manual out of it.


1 Overview

Agitate is a collection of commands or potentially useful functions that expand on the available version control features of Emacs. Those are meant to complement a workflow that relies on the built-in Version Control framework and its accoutrements (‘diff-mode.el’, ‘log-view.el’, ‘log-edit.el’, ‘vc-git.el’, and potentially others).

The following sections document the extras per their scope.


1.1 Extras for diff-mode

Function agitate-diff-refine-cycle

Cycle current, all, or no refined (word-wise) diff highlighting. Upon first invocation, refine the diff hunk at point or, when none exists, the one closest to it. On second call, operate on the entire buffer. And on the third time, remove all word-wise fontification.

Function agitate-diff-buffer-or-file

Produce a diff against the file or latest revision. If the buffer is modified, produce a diff that compares its state to that of the corresponding file. In simple terms, show the latest unsaved changes. If the buffer is not modified, produce a diff of the file relative to its latest revision.

Function agitate-diff-narrow-dwim

Narrow to diff hunk or file and widen when already narrowed. By default narrow to the focused diff hunk. With optional ‘NARROW-FILE’ as a prefix argument, operate on the current file instead.

Function agitate-diff-enable-outline-minor-mode

Enable outline-minor-mode with appropriate tweaks for diffs. This basically gives you folding of diff hunks by means of the outline-cycle command. Add this function to the diff-mode-hook.


1.2 Extras for log-edit

Function agitate-log-edit-insert-file-name

Insert at point file name sans directory from log-edit-files. If multiple files are involved, prompt with completion for one among them. With optional prefix argument ‘WITH-FILE-EXTENSION’, include the file extension. Else omit it.

Function agitate-log-edit-emoji-commit

Insert ‘EMOJI-COMMIT’ message at point. When called interactively, prompt for ‘EMOJI-COMMIT’ among the agitate-log-edit-emoji-collection.

Variable agitate-log-edit-emoji-collection

User option whose value is a list of strings that represent completion candidates for agitate-log-edit-emoji-commit. It is recommended to use the ‘:EMOJI:’ notation, as it works even in terminals that cannot output Unicode. Relevant applications will render those as their corresponding graphical emoji.

Function agitate-log-edit-conventional-commit

Insert conventional commit message at point. Prompt for entry among those declared in agitate-log-edit-conventional-commits-collection.

Variable agitate-log-edit-conventional-commits-collection

User options whose value is a list of strings that represent completion candidates for agitate-log-edit-conventional-commit.

The emoji commits are inspired by https://gitmoji.dev/, though I think most of those are superfluous. Less is more. The “conventional commits” are documented here: https://www.conventionalcommits.org/en/v1.0.0/.


1.2.1 Informative log-edit window configuration mode

The agitate-log-edit-informative-mode is a global minor mode that rearranges the window configuration (layout) when bringing up a log-edit buffer (such as what happens when ‘C-x v v’ (vc-next-action) is about to commit the changes). It shows the log-edit buffer on the left and the corresponding diff on the right.

When the user option agitate-log-edit-informative-show-files is non-nil (the default), the list of files pertinent to the current action is shown below the log-edit buffer.

When the user option agitate-log-edit-informative-show-root-log is non-nil, the root log of the revisions is shown below the window that displays the log-edit buffer. Its contents are bound by the value of the user option agitate-log-limit.


1.3 Extras for log-view

Function agitate-log-view-kill-revision

Append to kill-ring log-view revision at or around point. When the log-view is in the short format (one compact line per revision), the revision is the one on the current line. If the revision is expanded with log-view-expanded-log-entry-function and point is somewhere inside the expanded text, the revision is still the same. When the log-view is in the long format (detailed view where each revision spans several lines), the revision is the one pertinent to the text at point.

Function agitate-log-view-kill-revision-expanded

Append to kill-ring expanded message of log-view revision at point (developers can also check the private functions it uses).


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1.4 Extras for vc-git

Function agitate-vc-git-find-revision

Find revision of current file, visiting it in a buffer. Prompt with completion for the revision. The number of revisions in the log is controlled by the user option agitate-log-limit. Pro tip: if you are using the ‘embark’ package, you can produce a snapshot of the minibuffer prompt. Then use the resulting buffer to browse through the file’s history.

Function agitate-vc-git-show

Prompt for commit and run ‘git-show(1)’ on it. With optional ‘CURRENT-FILE’ as prefix argument, limit the commits to those pertaining to the current file. The number of revisions in the log is controlled by the user option agitate-log-limit. Pro tip: if you are using the ‘embark’ package, you can produce a snapshot of the minibuffer prompt. Then use the resulting buffer to browse through the available commits.

Function agitate-vc-git-show-tag

Run ‘git-show(1)’ on Git ‘TAG’. When called interactively, prompt for TAG using minibuffer completion. Pro tip: if you are using the ‘embark’ package, you can produce a snapshot of the minibuffer prompt. Then use the resulting buffer to browse through the available tags.

Function agitate-vc-git-format-patch-single

Format patch for a single ‘COMMIT’. If in a log-view buffer, the ‘COMMIT’ is the one at point. For the details of how that is determined, read the doc string of agitate-log-view-kill-revision. If there is no such commit at point, prompt for ‘COMMIT’ using minibuffer completion. Output the patch file to the return value of the function vc-root-dir. The number of revisions in the log is controlled by the user option agitate-log-limit. For Emacs 29, consider using vc-prepare-patch. Relevant except from the source code:

;; TODO 2022-09-27: Handle the output directory better.  Though I am
;; not sure how people work with those.  I normally use the root of
;; the current repo (and then clean it) or put everything in the
;; ~/Desktop or some dedicated "patches" directory.
Function agitate-vc-git-format-patch-n-from-head

Format patches covering ‘NUMBER’ of commits from current HEAD. This is the eqvuivalent of: ‘git format-patch -NUMBER’. For Emacs 29, consider using vc-prepare-patch.

Function agitate-vc-git-grep

Run ‘git-grep(1)’ for ‘REGEXP’ in vc-root-dir. This is a simple wrapper around vc-git-grep to streamline the basic task of searching for a regexp in the current Git repository. Use the original vc-git-grep for its other arguments.

Function agitate-vc-git-kill-commit-hash

Append to kill-ring hash of commit. Prompt for commit using minibuffer completion. The number of revisions in the log is controlled by the user option agitate-log-limit. To kill the message of the commit, use the command agitate-vc-git-kill-commit-message.

Function agitate-vc-git-kill-commit-message

Append to kill-ring message of commit with ‘HASH’ identifier. When called interactively, prompt for ‘HASH’ using minibuffer completion. When point is in a log-view buffer, make the revision at point the default value of the prompt (though also see the command agitate-log-view-kill-revision-expanded). The number of revisions in the log is controlled by the user option agitate-log-limit. To kill only the commit hash, use the command agitate-vc-git-kill-commit-hash.

Function agitate-vc-git-push-prompt-for-remote

Behave like vc-git-push but prompt for a remote, if needed. The meaning of ‘PROMPT’ is the same as that of vc-git-push. In such a case, do not prompt for a remote. To use this function add it as an override advice to vc-git-push. Relevant quote from the source code:

;; TODO 2022-09-27: We can have something similar which prompts for a
;; branch to push to.  There are lots of possibilities.  The idea is
;; that the user can pick the function they are most likely to use as
;; their default.  Then they can rely on PROMPT to modify its
;; behaviour.

2 Installation


2.1 GNU ELPA package

The package is available as ‘agitate’. Simply do:

M-x package-refresh-contents
M-x package-install

And search for it.

GNU ELPA provides the latest stable release. Those who prefer to follow the development process in order to report bugs or suggest changes, can use the version of the package from the GNU-devel ELPA archive. Read: https://protesilaos.com/codelog/2022-05-13-emacs-elpa-devel/.


Previous: , Up: Installation   [Index]

2.2 Manual installation

Assuming your Emacs files are found in ‘~/.emacs.d/’, execute the following commands in a shell prompt:

cd ~/.emacs.d

# Create a directory for manually-installed packages
mkdir manual-packages

# Go to the new directory
cd manual-packages

# Clone this repo, naming it "agitate"
git clone https://git.sr.ht/~protesilaos/agitate agitate

Finally, in your ‘init.el’ (or equivalent) evaluate this:

;; Make Elisp files in that directory available to the user.
(add-to-list 'load-path "~/.emacs.d/manual-packages/agitate")

Everything is in place to set up the package.


3 Sample configuration

;; These are all OPTIONAL.  You should just use whatever key bindings
;; or setup you prefer.

;; Agitate is still a WORK-IN-PROGRESS.

(require 'agitate)

(add-hook 'diff-mode-hook #'agitate-diff-enable-outline-minor-mode)

(advice-add #'vc-git-push :override #'agitate-vc-git-push-prompt-for-remote)

;; Also check: `agitate-log-edit-informative-show-files',
;; `agitate-log-edit-informative-show-root-log'.
(agitate-log-edit-informative-mode 1)

(let ((map global-map))
  (define-key map (kbd "C-x v =") #'agitate-diff-buffer-or-file) ; replace `vc-diff'
  (define-key map (kbd "C-x v g") #'agitate-vc-git-grep) ; replace `vc-annotate'
  (define-key map (kbd "C-x v f") #'agitate-vc-git-find-revision)
  (define-key map (kbd "C-x v s") #'agitate-vc-git-show)
  (define-key map (kbd "C-x v p p") #'agitate-vc-git-format-patch-single)
  (define-key map (kbd "C-x v p n") #'agitate-vc-git-format-patch-n-from-head))
(let ((map diff-mode-map))
  (define-key map (kbd "C-c C-b") #'agitate-diff-refine-cycle) ; replace `diff-refine-hunk'
  (define-key map (kbd "C-c C-n") #'agitate-diff-narrow-dwim))
(let ((map log-view-mode-map))
  (define-key map (kbd "w") #'agitate-log-view-kill-revision)
  (define-key map (kbd "W") #'agitate-log-view-kill-revision-expanded))
(let ((map vc-git-log-view-mode-map))
  (define-key map (kbd "c") #'agitate-vc-git-format-patch-single))
(let ((map log-edit-mode-map))
  (define-key map (kbd "C-c C-i C-n") #'agitate-log-edit-insert-file-name)
  ;; See user options `agitate-log-edit-emoji-collection' and
  ;; `agitate-log-edit-conventional-commits-collection'.
  (define-key map (kbd "C-c C-i C-e") #'agitate-log-edit-emoji-commit)
  (define-key map (kbd "C-c C-i C-c") #'agitate-log-edit-conventional-commit))

4 COPYING

Copyright (C) 2022-2023 Free Software Foundation, Inc.

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, with the Front-Cover Texts being “A GNU Manual,” and with the Back-Cover Texts as in (a) below. A copy of the license is included in the section entitled “GNU Free Documentation License.”

(a) The FSF’s Back-Cover Text is: “You have the freedom to copy and modify this GNU manual.”


5 GNU Free Documentation License

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

Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
  1. PREAMBLE

    The purpose of this License is to make a manual, textbook, or other functional and useful document free in the sense of freedom: to assure everyone the effective freedom to copy and redistribute it, with or without modifying it, either commercially or noncommercially. Secondarily, this License preserves for the author and publisher a way to get credit for their work, while not being considered responsible for modifications made by others.

    This License is a kind of “copyleft”, which means that derivative works of the document must themselves be free in the same sense. It complements the GNU General Public License, which is a copyleft license designed for free software.

    We have designed this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals providing the same freedoms that the software does. But this License is not limited to software manuals; it can be used for any textual work, regardless of subject matter or whether it is published as a printed book. We recommend this License principally for works whose purpose is instruction or reference.

  2. APPLICABILITY AND DEFINITIONS

    This License applies to any manual or other work, in any medium, that contains a notice placed by the copyright holder saying it can be distributed under the terms of this License. Such a notice grants a world-wide, royalty-free license, unlimited in duration, to use that work under the conditions stated herein. The “Document”, below, refers to any such manual or work. Any member of the public is a licensee, and is addressed as “you”. You accept the license if you copy, modify or distribute the work in a way requiring permission under copyright law.

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    It is requested, but not required, that you contact the authors of the Document well before redistributing any large number of copies, to give them a chance to provide you with an updated version of the Document.

  5. MODIFICATIONS

    You may copy and distribute a Modified Version of the Document under the conditions of sections 2 and 3 above, provided that you release the Modified Version under precisely this License, with the Modified Version filling the role of the Document, thus licensing distribution and modification of the Modified Version to whoever possesses a copy of it. In addition, you must do these things in the Modified Version:

    1. Use in the Title Page (and on the covers, if any) a title distinct from that of the Document, and from those of previous versions (which should, if there were any, be listed in the History section of the Document). You may use the same title as a previous version if the original publisher of that version gives permission.
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  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 https://www.gnu.org/licenses/.

    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.

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    “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.


6 Indices


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6.3 Concept index

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Installation instructions: Installation

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