From ff859ba22c23c01bdc9f4390e41eedc3254b9334 Mon Sep 17 00:00:00 2001
From: marty hiatt <martianhiatus [a t] riseup [d o t] net>
Date: Sun, 20 Nov 2022 12:30:11 +0100
Subject: mastodon-handle-regex: use for company + propertizing

---
 lisp/mastodon-toot.el | 42 +++++++++++++++++++++++++++---------------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/lisp/mastodon-toot.el b/lisp/mastodon-toot.el
index 125eeea..572d575 100644
--- a/lisp/mastodon-toot.el
+++ b/lisp/mastodon-toot.el
@@ -186,6 +186,14 @@ For the moment we just put all composed toots in here, as we want
 to also capture toots that are 'sent' but that don't successfully
 send.")
 
+(defvar mastodon-handle-regex
+  (concat
+   ;; preceding space or bol [boundary doesn't work with @]
+   "\\([\n\t ]\\|^\\)"
+   "\\(?2:@[1-9a-zA-Z._-]+" ; a handle
+   "\\(@[^ \n\t]*\\)?\\)" ; with poss domain, * = allow only @
+   "\\b"))
+
 (defvar mastodon-toot-mode-map
   (let ((map (make-sparse-keymap)))
     (define-key map (kbd "C-c C-c") #'mastodon-toot--send)
@@ -770,17 +778,24 @@ for matches, CANDIDATES-FUN, ANNOT-FUN, and META-FUN are
 functions called on ARG to generate formatted candidates, annotation, and
 meta fields respectively."
   (interactive (list 'interactive))
-  (cl-case command
-    (interactive (company-begin-backend (quote backend-name)))
-    (prefix (when (and (bound-and-true-p mastodon-toot-mode) ; if masto toot minor mode
-                       (save-excursion
-                         (forward-whitespace -1)
-                         (forward-whitespace 1)
-                         (looking-at str-prefix)))
-              (concat str-prefix (company-grab-symbol))))
-    (candidates (funcall candidates-fun arg))
-    (annotation (funcall annot-fun arg))
-    (meta (funcall meta-fun arg))))
+  (let ((handle-before
+         (save-match-data
+           (save-excursion
+             (re-search-backward mastodon-handle-regex nil :no-error)
+             (if (match-string-no-properties 2)
+                 (buffer-substring-no-properties (match-beginning 2) (match-end 2))
+               "")))))
+    (cl-case command
+      (interactive (company-begin-backend (quote backend-name)))
+      (prefix (when (and (bound-and-true-p mastodon-toot-mode) ; if masto toot minor mode
+                         (save-excursion
+                           (forward-whitespace -1)
+                           (forward-whitespace 1)
+                           (looking-at str-prefix)))
+                (concat str-prefix (substring-no-properties handle-before 1))))
+      (candidates (funcall candidates-fun arg))
+      (annotation (funcall annot-fun arg))
+      (meta (funcall meta-fun arg)))))
 
 (defun mastodon-toot-mentions (command &optional arg &rest ignored)
   "A company completion backend for toot mentions.
@@ -1266,10 +1281,7 @@ Added to `after-change-functions'."
                                       'success
                                       (cdr header-region))
       (mastodon-toot--propertize-item
-       (concat "\\([\n\t ]\\|^\\)" ; preceding space or bol
-               "\\(?2:@[1-9a-zA-Z._-]+" ; a handle
-               "\\(@[1-9a-zA-Z._-]+\\)?\\)" ; with poss domain
-               "\\b") ; boundary
+       mastodon-handle-regex
        'mastodon-display-name-face
        (cdr header-region)))))
 
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