From 7f0561881110bc476789cf151d5a823c786f091a Mon Sep 17 00:00:00 2001
From: Trevor Slocum <trevor@rocketnine.space>
Date: Tue, 18 Aug 2020 18:51:32 -0700
Subject: [PATCH] Show error when ImageMagick is enabled but is not installed

---
 inc/functions.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/inc/functions.php b/inc/functions.php
index 6a582f5..fec480b 100644
--- a/inc/functions.php
+++ b/inc/functions.php
@@ -506,8 +506,15 @@ function createThumbnail($file_location, $thumb_location, $new_w, $new_h) {
 
 		imagedestroy($dst_img);
 		imagedestroy($src_img);
-	} else { // imagemagick
+	} else { // ImageMagick
 		$discard = '';
+
+		$exit_status = 1;
+		exec("convert -version", $discard, $exit_status);
+		if ($exit_status != 0) {
+			fancyDie('ImageMagick is not installed, or the convert command is not in the server\'s $PATH.<br>Install ImageMagick, or set TINYIB_THUMBNAIL to \'gd\'.');
+		}
+
 		$exit_status = 1;
 		exec("convert $file_location -auto-orient -thumbnail '" . $new_w . "x" . $new_h . "' -coalesce -layers OptimizeFrame -depth 4 -type palettealpha $thumb_location", $discard, $exit_status);