From 3c2abf21612e7b9bb7ae48077e6c598f11db7fac Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Thu, 12 Apr 2018 12:07:19 +0200
Subject: [PATCH] gopher.sh: small fixes: - Allow INVERT for colour inversion
 of displayed images (for bright BG) - Fix PREFIXes ("+" was not recognized) -
 Fix "EXIT" to exit program in dialog mode (was only going back) - Fix "BACK"
 to go back to the previous menu in dialog mode (was doing nothing)

---
 gopher.sh | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/gopher.sh b/gopher.sh
index 3e9a264..f896f9d 100755
--- a/gopher.sh
+++ b/gopher.sh
@@ -20,6 +20,9 @@
 #		1 : means colour 1
 #		2 : means colour 2
 #		[...]
+# 	INVERT    : invert the output for image viewing (for white backgrounds)
+# 		0 : do not invert (default)
+#		1 : invert 
 
 SERVER="$1"
 SELECTOR="$2"
@@ -60,7 +63,14 @@ if [ "$USE_DIALOG" = "" ]; then
 	fi
 fi
 
-PREFIX="[0-9hIg]"
+# Invert image viewer
+if [ "$INVERT" = 1 ]; then
+	INVERT="--invert"
+else
+	INVERT=
+fi
+
+PREFIX="[0-9hIg+]"
 
 # $0 [FILE] (dialog)
 # Display a gopher menu for the given resource
@@ -148,8 +158,9 @@ download)
 				--menu "$title" \
 				"$LINES" "$COLUMNS" "$LINES" \
 				--file "$tmp.menu" 2>"$tmp.choice"
-			clear
 			val=$?
+			clear
+			
 			if [ $val = 3 ]; then
 				CHOICE=""
 			elif [ $val = 1 ]; then
@@ -193,11 +204,13 @@ download)
 g|I)
 	if img2aa --help >/dev/null 2>&1; then
 		img2aa --mode=DITHERING \
+			$INVERT \
 			--width=74 "$tmp" | less
 	elif jp2a -h >/dev/null 2>&1; then
 		if convert -h >/dev/null 2>&1; then
 			convert "$tmp" "$tmp.jpg"
 			jp2a --border --chars=" .-+=o8#"\
+				$INVERT \
 				--width=74 "$tmp.jpg" | less
 		else
 			echo "required program not found to view images: convert" \
-- 
2.27.0