From 8b759031056345fbf8f8b1b08c407917b0ad3fb5 Mon Sep 17 00:00:00 2001
From: Jens Kleineheismann <heinzel@alpenverein-karlsruhe.de>
Date: Fri, 22 Mar 2019 17:32:26 +0100
Subject: [PATCH] ADD: prototype script to compare screenshots.

---
 diff-screenshots.sh | 135 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100755 diff-screenshots.sh

diff --git a/diff-screenshots.sh b/diff-screenshots.sh
new file mode 100755
index 0000000..1331986
--- /dev/null
+++ b/diff-screenshots.sh
@@ -0,0 +1,135 @@
+#!/bin/bash
+
+function print_help() {
+	bn=`basename $0`
+	cat <<E-O-H
+Usage: $bn DIR1 DIR2
+E-O-H
+}
+
+function ask_yesno() {
+	local prompt="Yes or No?"
+	local text=""
+	local default=""
+	local answer=""
+	local retval=""
+	
+	while test $# -gt 0 ; do
+	case "$1" in
+	-y)
+		default="yes"
+		shift
+		;;
+	-n)
+		default="no"
+		shift
+		;;
+	*)
+		prompt="$*"
+		break
+		;;
+	esac
+	done
+	
+	text="$prompt (y/n)"
+	if test "X${default}" = "Xyes" ; then
+		text="$text [y]"
+	elif test "X${default}" = "Xno" ; then
+		text="$text [n]"
+	fi
+	text="$text "
+	
+	while : ; do
+		read -p "$text" -n 1 answer
+		case "$answer" in
+		y|Y|t|T|1)
+			echo ""
+			retval=0
+			;;
+		n|N|f|F|0)
+			echo ""
+			retval=1
+			;;
+		'')
+			if test "X${default}" = "Xyes" ; then
+				retval=0
+			elif test "X${default}" = "Xno" ; then
+				retval=1
+			else
+				echo "Please press the <y>-Key or the <n>-Key!" >&2
+				echo "Or press Ctrl-C to abort." >&2
+				echo ""
+				continue
+			fi
+			;;
+		*)
+		        echo ""
+		        echo "What? $answer?" >&2
+		        echo "Please press the <y>-Key or the <n>-Key!" >&2
+		        echo "Or press Ctrl-C to abort." >&2
+		        echo ""
+		        continue
+		        ;;
+		esac
+		break
+	done
+	return $retval
+}
+
+
+ORIGINAL_DIR=""
+MODIFIED_DIR=""
+
+if test $# -le 1 ; then
+        set -- -h
+fi
+
+while test $# -gt 0 ; do
+case "$1" in
+-h|--help)
+        print_help
+        exit 0
+        ;;
+*)
+	ORIGINAL_DIR="$1"
+	MODIFIED_DIR="$2"
+	break
+	;;
+esac
+done
+
+ORIGINAL_DIR=`echo "$ORIGINAL_DIR" | sed -e 's:/*$::'`
+MODIFIED_DIR=`echo "$MODIFIED_DIR" | sed -e 's:/*$::'`
+
+original_files=`find "$ORIGINAL_DIR" -type f`
+for original in $original_files ; do
+	relpath="${original#${ORIGINAL_DIR}/}"
+	reldir=`dirname "$relpath"`
+	basename=`basename "$relpath"`
+	basename_pattern=`echo "$basename" | sed -E -e 's:^[0-9]{8}-[0-9]{6}.[0-9]{6}-:*-*.*-:'`
+	modified_pattern="${MODIFIED_DIR}/${reldir}/${basename_pattern}"
+	modified=`echo $modified_pattern`
+	if ! test -e "$modified" ; then
+		echo "Only in ${ORIGINAL_DIR}: $relpath" >&2
+	else
+		if ! cmp --quiet "$original" "$modified" ; then
+			echo "File differ: $relpath" >&2
+			prompt="Display changes?"
+			if ask_yesno -n "$prompt" ; then
+				compare "$original" "$modified" miff:- | display
+			fi
+		fi
+	fi
+done
+
+find "$MODIFIED_DIR" -type f | while read modified ; do
+	relpath="${modified#${MODIFIED_DIR}/}"
+	reldir=`dirname "$relpath"`
+	basename=`basename "$relpath"`
+	basename_pattern=`echo "$basename" | sed -E -e 's:^[0-9]{8}-[0-9]{6}.[0-9]{6}-:*-*.*-:'`
+	original_pattern="${ORIGINAL_DIR}/${reldir}/${basename_pattern}"
+	original=`echo $original_pattern`
+	if ! test -e "$original" ; then
+		echo "Only in ${MODIFIED_DIR}: $relpath" >&2
+	fi
+done