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bug#36486: [PATCH] Add tests for text-property-search to check prop-matc

From: Juri Linkov
Subject: bug#36486: [PATCH] Add tests for text-property-search to check prop-match-value
Date: Tue, 09 Jul 2019 23:31:05 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>> But searching for a certain font-lock face value is the most useful
>> application of this command.  How do you do that?
> Non-interactively?
> (I've never used it to search for any faces.  :-))

It is useful interactively to find errors fontified
with the error face.  Here is a better patch that
can read symbols as well as strings:

diff --git a/lisp/emacs-lisp/text-property-search.el 
index 41ca07057e..9c45cee3c1 100644
--- a/lisp/emacs-lisp/text-property-search.el
+++ b/lisp/emacs-lisp/text-property-search.el
@@ -54,10 +54,13 @@ text-property-search-forward
 that's matching), and `prop-match-value' (the value of PROPERTY
 at the start of the region)."
-   (list
-    (let ((string (completing-read "Search for property: " obarray)))
-      (when (> (length string) 0)
-        (intern string obarray)))))
+   (let* ((property (completing-read "Search for property: " obarray))
+          (property (when (> (length property) 0)
+                      (intern property obarray)))
+          (value (when property
+                   (read-from-minibuffer "Search for property value: "
+                                         nil nil t nil "nil"))))
+     (list property value)))
    ;; No matches at the end of the buffer.

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