From: Kyle Meyer <kyle@kyleam.com>

notmuch-before-tag-hook and notmuch-after-tag-hook are supposed to
have access to two dynamic variables, tag-changes and query, but these
were lost with the switch to lexical binding in fc4cda07 (emacs: use
lexical-bindings in all libraries, 2021-01-13).

Add a variant of Emacs's dlet (not available until Emacs 28) and use
it in notmuch-tag to expose tag-changes and query to the hooks.
---
 emacs/notmuch-compat.el | 12 ++++++++++++
 emacs/notmuch-tag.el    |  8 ++++++--
 test/T310-emacs.sh      |  2 --
 3 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/emacs/notmuch-compat.el b/emacs/notmuch-compat.el
index ad134dfe..179bf59c 100644
--- a/emacs/notmuch-compat.el
+++ b/emacs/notmuch-compat.el
@@ -41,6 +41,18 @@
 (unless (fboundp 'message--fold-long-headers)
   (add-hook 'message-header-hook 'notmuch-message--fold-long-headers))
 
+;; `dlet' isn't available until Emacs 28.1.  Below is a copy, with the
+;; addition of `with-no-warnings'.
+(defmacro notmuch-dlet (binders &rest body)
+  "Like `let*' but using dynamic scoping."
+  (declare (indent 1) (debug let))
+  `(let (_)
+     (with-no-warnings  ; Quiet "lacks a prefix" warning.
+       ,@(mapcar (lambda (binder)
+		   `(defvar ,(if (consp binder) (car binder) binder)))
+		 binders))
+     (let* ,binders ,@body)))
+
 (provide 'notmuch-compat)
 
 ;;; notmuch-compat.el ends here
diff --git a/emacs/notmuch-tag.el b/emacs/notmuch-tag.el
index f348d4ae..ebccb5a0 100644
--- a/emacs/notmuch-tag.el
+++ b/emacs/notmuch-tag.el
@@ -486,7 +486,9 @@ notmuch-after-tag-hook will be run."
   (unless query
     (error "Nothing to tag!"))
   (when tag-changes
-    (run-hooks 'notmuch-before-tag-hook)
+    (notmuch-dlet ((tag-changes tag-changes)
+		   (query query))
+      (run-hooks 'notmuch-before-tag-hook))
     (if (<= (length query) notmuch-tag-argument-limit)
 	(apply 'notmuch-call-notmuch-process "tag"
 	       (append tag-changes (list "--" query)))
@@ -494,7 +496,9 @@ notmuch-after-tag-hook will be run."
       (let ((batch-op (concat (mapconcat #'notmuch-hex-encode tag-changes " ")
 			      " -- " query)))
 	(notmuch-call-notmuch-process :stdin-string batch-op "tag" "--batch")))
-    (run-hooks 'notmuch-after-tag-hook)))
+    (notmuch-dlet ((tag-changes tag-changes)
+		   (query query))
+      (run-hooks 'notmuch-after-tag-hook))))
 
 (defun notmuch-tag-change-list (tags &optional reverse)
   "Convert TAGS into a list of tag changes.
diff --git a/test/T310-emacs.sh b/test/T310-emacs.sh
index 5ebc8e66..e6489246 100755
--- a/test/T310-emacs.sh
+++ b/test/T310-emacs.sh
@@ -162,7 +162,6 @@ output=$(notmuch search $os_x_darwin_thread | notmuch_search_sanitize)
 test_expect_equal "$output" "thread:XXX   2009-11-18 [4/4] Jjgod Jiang, Alexander Botero-Lowry; [notmuch] Mac OS X/Darwin compatibility issues (inbox unread)"
 
 test_begin_subtest "notmuch-show: before-tag-hook is run, variables are defined"
-test_subtest_known_broken
 output=$(test_emacs '(let ((notmuch-test-tag-hook-output nil)
 	          (notmuch-before-tag-hook (function notmuch-test-tag-hook)))
 	       (notmuch-show "id:ddd65cda0911171950o4eea4389v86de9525e46052d3@mail.gmail.com")
@@ -174,7 +173,6 @@ test_expect_equal "$output" \
  ("id:ddd65cda0911171950o4eea4389v86de9525e46052d3@mail.gmail.com" "+activate-hook"))'
 
 test_begin_subtest "notmuch-show: after-tag-hook is run, variables are defined"
-test_subtest_known_broken
 output=$(test_emacs '(let ((notmuch-test-tag-hook-output nil)
 	          (notmuch-after-tag-hook (function notmuch-test-tag-hook)))
 	       (notmuch-show "id:ddd65cda0911171950o4eea4389v86de9525e46052d3@mail.gmail.com")
-- 
2.30.2
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