From 0c024848f91a9ca1aad8e4a0bd651091feb3608a Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Sat, 13 Jun 2026 13:02:46 -0500
Subject: fix(markdown): restore the live preview (rename, guard, dead setq)

F2 ran markdown-mode's own markdown-preview instead of the custom one, so the impatient-mode strapdown preview was dead. I renamed the custom command to cj/markdown-preview and rebound F2 so markdown-mode no longer shadows it. The server guard now uses httpd-running-p (httpd-process isn't a variable), and a dead (setq imp-set-user-filter 'markdown-html) that named neither a real variable nor a real filter is gone.
---
 tests/test-markdown-config.el | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'tests')

diff --git a/tests/test-markdown-config.el b/tests/test-markdown-config.el
index 45e1a6018..edb20d357 100644
--- a/tests/test-markdown-config.el
+++ b/tests/test-markdown-config.el
@@ -9,6 +9,7 @@
 ;;; Code:
 
 (require 'ert)
+(require 'cl-lib)
 
 (add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
 
@@ -50,5 +51,14 @@
           (should (string-match-p "<xmp" (buffer-string))))
       (kill-buffer src))))
 
+;;; cj/markdown-preview (guard: refuse when the httpd listener is down)
+
+(ert-deftest test-markdown-preview-errors-when-server-down ()
+  "Error: `cj/markdown-preview' signals a user-error when the simple-httpd
+listener is not running, rather than opening a preview against a dead server.
+Also pins the rename off the bare `markdown-preview' that markdown-mode shadows."
+  (cl-letf (((symbol-function 'httpd-running-p) (lambda () nil)))
+    (should-error (cj/markdown-preview) :type 'user-error)))
+
 (provide 'test-markdown-config)
 ;;; test-markdown-config.el ends here
-- 
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