From 0d0ec3916c1a7089dc172347b0031cca4046b21d Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Sun, 18 Dec 2022 23:11:36 -0700
Subject: mailscripts.el: load notmuch and gnus libs only when required

They are both large, and most users will use at most one of the two.

Signed-off-by: Sean Whitton <spwhitton@spwhitton.name>
---
 debian/changelog |  1 +
 mailscripts.el   | 17 +++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/debian/changelog b/debian/changelog
index 5aea66f..f5bf071 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -4,6 +4,7 @@ mailscripts (28-1) UNRELEASED; urgency=medium
     - new commands: mailscripts-git-format-patch-{attach,drafts}
     - new DWIM wrapper command: mailscripts-prepare-patch
     - rewrite short description and add a brief commentary
+    - load the notmuch library only when code that requires it is called
     - move the mailscripts customisation group into the mail group
     - add declarations to fix byte compilation warnings
     - fix usage of cl-case in an internal function.
diff --git a/mailscripts.el b/mailscripts.el
index e255aec..566b38b 100644
--- a/mailscripts.el
+++ b/mailscripts.el
@@ -33,11 +33,11 @@
 ;;; Code:
 
 (require 'cl-lib)
-(require 'notmuch)
 (require 'thingatpt)
 (require 'vc)
 (require 'message)
-(require 'gnus)
+
+(eval-when-compile (require 'notmuch))
 
 (defgroup mailscripts nil
   "Customisation of functions in the mailscripts package."
@@ -81,6 +81,7 @@ must be set to the one you use."
 
 If NO-OPEN, don't open the thread."
   (interactive "sBug number: ")
+  (require 'notmuch)
   (call-process-shell-command (concat "notmuch-slurp-debbug " bug))
   (unless no-open
     (let* ((search (concat "Bug#" bug))
@@ -102,10 +103,14 @@ If NO-OPEN, don't open the thread."
     (skip-chars-forward "#bBug" (+ 4 (point)))
     (notmuch-slurp-debbug (number-to-string (number-at-point)))))
 
+(declare-function notmuch-show-get-subject "notmuch-show")
+(declare-function notmuch-refresh-this-buffer "notmuch-lib")
+
 ;;;###autoload
 (defun notmuch-slurp-this-debbug ()
   "When viewing a Debian bug in notmuch, download any missing messages."
   (interactive)
+  (require 'notmuch)
   (let ((subject (notmuch-show-get-subject)))
     (notmuch-slurp-debbug
      (if (string-match "Bug#\\([0-9]+\\):" subject)
@@ -128,6 +133,7 @@ particular, this Emacs Lisp function supports passing only entire
 threads to the notmuch-extract-patch(1) command."
   (interactive
    "Dgit repo: \nsnew branch name (or leave blank to apply to current HEAD): \nP")
+  (require 'notmuch)
   (let ((thread-id
          ;; If `notmuch-show' was called with a notmuch query rather
          ;; than a thread ID, as `org-notmuch-follow-link' in
@@ -165,6 +171,10 @@ threads to the notmuch-extract-patch(1) command."
    (when current-prefix-arg
      (prefix-numeric-value current-prefix-arg))))
 
+(declare-function notmuch-foreach-mime-part "notmuch")
+(declare-function notmuch--call-process "notmuch-lib")
+(declare-function notmuch-show-get-message-id "notmuch-show")
+
 ;;;###autoload
 (defun notmuch-extract-message-patches (repo branch)
   "Extract patches attached to current message to branch BRANCH in repo REPO.
@@ -176,6 +186,7 @@ attachments with filenames which look like they were generated by
 git-format-patch(1)."
   (interactive
    "Dgit repo: \nsnew branch name (or leave blank to apply to current HEAD): ")
+  (require 'notmuch)
   (with-current-notmuch-show-message
    (let ((default-directory (expand-file-name repo))
          (mm-handle (mm-dissect-buffer t)))
@@ -288,6 +299,7 @@ See also the interactive wrapper command `mailscripts-prepare-patch'."
 (declare-function gnus-group-read-ephemeral-group "gnus-group")
 
 (defun mailscripts--gfp-drafts-gnus (args)
+  (require 'gnus)
   (let* ((temp (make-temp-file "patches"))
 	 (group (concat "nndoc+ephemeral:" temp))
 	 (method `(nndoc ,temp (nndoc-article-type mbox)))
@@ -311,6 +323,7 @@ See also the interactive wrapper command `mailscripts-prepare-patch'."
     (gnus-summary-goto-article message-id)))
 
 (defun mailscripts--gfp-drafts-notmuch (args)
+  (require 'notmuch)
   (let ((temp (make-temp-file "patches" t))
 	(insert (cl-list* "insert" (format "--folder=%s" notmuch-draft-folder)
 			  "--create-folder" notmuch-draft-tags)))
-- 
cgit v1.2.3