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;;; piem-b4.el --- Emacs interface to the b4 tool -*- lexical-binding: t; -*-
;; Copyright (C) 2020 Kyle Meyer
;; Author: Kyle Meyer <kyle@kyleam.com>
;; Keywords: vc, tools
;; Package-Requires: ((emacs "26.3") (transient "0.2.0"))
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;; This library provides a Transient [1] interface to b4 [2]. It is
;; documented in the piem manual.
;;
;; [1] https://magit.vc/manual/transient/
;; [2] https://git.kernel.org/pub/scm/utils/b4/b4.git
;;; Code:
(require 'cl-lib)
(require 'mail-extr)
(require 'message)
(require 'piem)
(require 'transient)
;;;; Options
(defgroup piem-b4 nil
"Control the b4 tool from Emacs."
:link '(info-link "(piem)Using b4 to apply patches")
:group 'piem)
(defcustom piem-b4-b4-executable "b4"
"Which b4 executable to use."
:type 'string)
;;;; Internals
(defvar piem-b4-keep-temp-directory nil
"Don't clean up the directory created by `piem-b4-am-from-mid'.
This is intended to be used for debugging purposes.")
(defun piem-b4--get-am-files (mid coderepo args)
(let* ((outdir (file-name-as-directory
(make-temp-file "piem-b4-" t)))
(root (concat outdir "m"))
(mbox-thread (concat root "-piem"))
(local-mbox-p nil)
(clean-fn (and (not piem-b4-keep-temp-directory)
(lambda () (delete-directory outdir t)))))
(when-let ((fn (run-hook-with-args-until-success
'piem-mid-to-thread-functions mid)))
(with-temp-file mbox-thread
(funcall fn)
(unless (= (point-max) 1)
(setq local-mbox-p t))))
;; `piem-mid-to-thread-functions' didn't generate an mbox. Next
;; try to download it from a URL at `piem-inboxes'. Finally, fall
;; back to b4's configuration.
(unless local-mbox-p
(when-let ((url (piem-inbox-get :url))
(mid (piem-mid))
(buffer (condition-case nil
(piem-download-and-decompress
(concat url (piem-escape-mid mid) "/t.mbox.gz"))
(error nil))))
(with-current-buffer buffer
(write-region nil nil mbox-thread))
(kill-buffer buffer)
(setq local-mbox-p t)))
;; Move to the coderepo so that we pick up any b4 configuration
;; from there.
(condition-case err
(apply #'piem-process-call coderepo piem-b4-b4-executable "am"
(and local-mbox-p
(concat "--use-local-mbox=" mbox-thread))
(concat "--outdir=" outdir)
(concat "--mbox-name=m")
(append args (list mid)))
(piem-process-error
(when clean-fn
(funcall clean-fn))
(signal (car err) (cdr err))))
(let ((mbox-cover (concat root ".cover"))
(mbox-am (concat root ".mbx")))
(list (and (file-exists-p mbox-cover)
mbox-cover)
(if (file-exists-p mbox-am)
mbox-am
(when clean-fn
(funcall clean-fn))
(error "Expected mbox file does not exist: %s" mbox-am))
clean-fn))))
;;;; Commands
;;;###autoload
(defun piem-b4-am-ready-from-mbox (mbox &optional args)
"Extract an am-ready mbox from a thread of messages.
MBOX is the file name of an mbox that contains a patch series.
ARGS is a list of arguments to pass to `b4 am'."
(interactive (list (read-file-name "mbox: ")
(transient-args 'piem-b4-am)))
(apply #'piem-process-start nil piem-b4-b4-executable "am"
(cons (concat "--use-local-mbox=" mbox) args)))
;;;###autoload
(defun piem-b4-am-ready-from-mid (mid &optional args)
"Download the thread for MID and and extract an am-ready mbox.
MID is a message ID to pass directly to `b4 am', along with the
list of arguments specified via ARGS."
(interactive (list (read-string "Message ID: " nil nil (piem-mid))
(transient-args 'piem-b4-am)))
(apply #'piem-process-start nil piem-b4-b4-executable "am"
(append args (list mid))))
;;;###autoload
(defun piem-b4-am-from-mid (mid &optional args toggle-worktree)
"Get the thread for MID, extract an am-ready mbox, and apply it.
Try to get a thread for the Message-Id MID with
`piem-mid-to-thread-functions', falling back to letting b4
download it. After calling `b4 am' with ARGS to prepare an
am-ready mbox, feed the result to `git am'.
When prefix argument TOGGLE-WORKTREE is non-nil, invert the
meaning of `piem-am-create-worktree'. With the default value,
this triggers the creation of a new worktree."
(interactive (list (or (piem-mid)
(read-string "Message ID: "))
(transient-args 'piem-b4-am)
current-prefix-arg))
(when-let ((badopt (cl-some
(lambda (arg)
(and (string-match
(rx string-start
(group (or "--outdir" "--mbox-name")) "=")
arg)
(match-string 1 arg)))
args)))
(user-error "%s is incompatible with this command" badopt))
(pcase-let* ((coderepo (piem-inbox-coderepo-maybe-read))
(`(,cover ,mbox-file ,clean-fn)
(piem-b4--get-am-files mid coderepo args))
(default-directory coderepo))
(unwind-protect
(piem-am mbox-file
nil
(with-temp-buffer
(insert-file-contents (or cover mbox-file))
(piem-extract-mbox-info))
coderepo
toggle-worktree)
(when clean-fn
(funcall clean-fn)))))
(define-infix-argument piem-b4-am:--outdir ()
:description "Output directory"
:class 'transient-option
:shortarg "-o"
:argument "--outdir="
:reader #'transient-read-existing-directory)
(define-infix-argument piem-b4-am:--mbox-name ()
:description "Base file name for mbox"
:class 'transient-option
:shortarg "-n"
:argument "--mbox-name="
:reader #'read-string)
(define-infix-argument piem-b4-am:--use-version ()
:description "Desired version of patch series"
:class 'transient-option
:shortarg "-v"
:argument "--use-version="
:reader #'transient-read-number-N+)
(define-infix-argument piem-b4-am:--cherry-pick ()
:description "Select a subset of patches by number"
:class 'transient-option
:shortarg "-P"
:argument "--cherry-pick="
:reader #'read-string)
;;;###autoload (autoload 'piem-b4-am "piem-b4" nil t)
(define-transient-command piem-b4-am ()
"Filter mbox to patches and feed to git-am"
["General options"
("-c" "Check newer versions" "--check-newer-revisions")
("-C" "Don't use local cache" "--no-cache")
("-s" "Add my signed-off-by" "--add-my-sob")
("-S" "Apply trailers without checking email addresses" "--sloppy-trailers")
("-t" "Apply cover letter trailers" "--apply-cover-trailers")
("-T" "Do not add trailers" "--no-add-trailers")
(piem-b4-am:--use-version)
(piem-b4-am:--cherry-pick)]
["Options for creating am-ready mboxes"
(piem-b4-am:--outdir)
(piem-b4-am:--mbox-name)]
["Actions"
[("a" "Message ID -> mbox -> git-am" piem-b4-am-from-mid)]
[("b" "Local mbox -> am-ready mbox" piem-b4-am-ready-from-mbox)
("i" "Message ID -> am-ready mbox" piem-b4-am-ready-from-mid)]])
;;; piem-b4.el ends here
(provide 'piem-b4)
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