Update image_previews.md

1 files changed, 34 insertions, 12 deletions

diff --git a/docs/image_previews.md b/docs/image_previews.md
index 8399281..41e05e8 100644
--- a/docs/image_previews.md
+++ b/docs/image_previews.md
@@ -233,25 +233,35 @@ To preview images in Kitty, you need to create these two scripts and make them e
 ```shell
 #!/usr/bin/env bash
 
+FILE_PATH="$1"			# Full path of the previewed file
+PREVIEW_X_COORD="$2"		# x coordinate of upper left cell of preview area
+PREVIEW_Y_COORD="$3"		# y coordinate of upper left cell of preview area
+PREVIEW_WIDTH="$4"		# Width of the preview pane (number of fitting characters)
+PREVIEW_HEIGHT="$5"		# Height of the preview pane (number of fitting characters)
+
 TMP_FILE="$HOME/.cache/joshuto/thumbcache.png"
 
-file="$1"
-X="$2"
-Y="$3"
-width="$4"
-height="$5"
+mimetype=$(file --mime-type -Lb "$FILE_PATH")
 
 function image {
-	kitty +kitten icat --transfer-mode=file --clear 2>/dev/null
-	kitty +kitten icat --transfer-mode=file --place "${width}x${height}@${X}x${Y}" "$1" 2>/dev/null
+	kitty +kitten icat \
+		--transfer-mode=file \
+		--clear 2>/dev/null
+	kitty +kitten icat \
+		--transfer-mode=file \
+		--place "${PREVIEW_WIDTH}x${PREVIEW_HEIGHT}@${PREVIEW_X_COORD}x${PREVIEW_Y_COORD}" \
+		"$1" 2>/dev/null
 }
 
-case $(file -b --mime-type "${file}") in
+case "$mimetype" in
 	image/*)
-		image "${file}"
+		image "${FILE_PATH}"
+		;;
+	*)
+		kitty +kitten icat \
+			--transfer-mode=file \
+			--clear 2>/dev/null
 		;;
-    *)
-	    kitty +kitten icat --transfer-mode=file --clear 2>/dev/null
 esac
 ```
 
@@ -259,7 +269,9 @@ esac
 ```shell
 #!/usr/bin/env bash
 
-kitty +kitten icat --transfer-mode=file --clear 2>/dev/null
+kitty +kitten icat \
+	--transfer-mode=file \
+	--clear 2>/dev/null
 ```
 
 The first script will use icat to place an image on top of joshuto's preview window.
@@ -269,6 +281,16 @@ The second script simply clears any existing images on the screen.
 
 Thats it. Previewing images should now work whenever you select a file.
 
+NOTE: make sure the `preview_file.sh` script returns 5 exit code when previewing images in order for this to work:
+
+```sh
+...
+handle_mime() {
+    ...
+    exit 5
+}
+```
+
 ## Kitty Demo: 
 ![Demo](https://user-images.githubusercontent.com/57725322/150659504-203c7175-4bee-4e46-b5c5-16cc16a51a12.png)