From bc36e0c8db99ec2f7f0284ea07a5f88e086229a2 Mon Sep 17 00:00:00 2001
From: Alan Somers <asomers@gmail.com>
Date: Sun, 2 Oct 2011 11:55:58 -0600
Subject: [PATCH] Adding a script to graphically diff PCB files

---
 tools/Makefile.am |    3 +-
 tools/pcbdiff     |   64 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletions(-)
 create mode 100755 tools/pcbdiff

diff --git a/tools/Makefile.am b/tools/Makefile.am
index d9665a9..f350471 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -21,7 +21,8 @@ TOOLS= \
 	tgo2pcb.tcl \
 	MergePCBPS \
 	Merge_dimPCBPS \
-	PCB2HPGL 
+	PCB2HPGL \
+	pcbdiff
 
 DIST_SCM= \
 	gnet-pcbfwd.scm
diff --git a/tools/pcbdiff b/tools/pcbdiff
new file mode 100755
index 0000000..00378cd
--- /dev/null
+++ b/tools/pcbdiff
@@ -0,0 +1,64 @@
+#! /bin/sh
+
+usage ()
+{
+  echo Usage: 
+  echo \\tpcbdiff firstfile secondfile
+  echo \\tView a graphical diff of PCB files
+  echo
+  echo \\tTo use with git, just place this script in your PATH and do
+  echo \\tgit difftool -x pcbdiff ...
+  echo
+  echo \\tTo use with mercurial, add the following lines to your .hgrc:
+  echo \\t\\t[extensions]
+  echo \\t\\thgext.extdiff =
+  echo \\t\\t[extdiff]
+  echo \\t\\tcmd.pcbdiff = /PATH/TO/pcbdiff
+  echo \\tthen to invoke it, do
+  echo \\thg pcbdiff ...
+  echo
+  echo \\tTo use with subversion, place it in your PATH and do
+  echo \\tsvn diff --diff-cmd pcbdiff ...
+
+  echo \\tRequirements: Imagemagick and gschem be installed
+}
+
+
+for PROG in pcb convert composite
+do
+  if which $PROG > /dev/null
+  then 
+    true
+  else 
+    echo "$PROG is not found.  Either it is not installed, or not in your PATH"
+    exit 1
+  fi
+done
+
+#In case the script was invoked with extra option arguments, throw them away
+shift `expr $# - 2`
+
+if test -d $1 -o -d $2
+  then echo "ERROR: pcbdiff cannot diff entire directories"
+  exit 1
+fi
+
+LEFTFILE=$1
+RIGHTFILE=$2
+LEFTPNG=`mktemp --tmpdir pcbdiff.XXXXXXXXXX`
+RIGHTPNG=`mktemp --tmpdir pcbdiff.XXXXXXXXXX`
+LEFTBNW=`mktemp --tmpdir pcbdiff.XXXXXXXXXX`
+RIGHTBNW=`mktemp --tmpdir pcbdiff.XXXXXXXXXX`
+DIFFPNG=`mktemp --tmpdir pcbdiff.XXXXXXXXXX`
+
+pcb -x png --dpi 200 --only-visible --photo-mode --outfile $LEFTPNG $LEFTFILE
+pcb -x png --dpi 200 --only-visible --photo-mode --outfile $RIGHTPNG $RIGHTFILE
+convert -colorspace gray $LEFTPNG $LEFTBNW
+convert -colorspace gray $RIGHTPNG $RIGHTBNW
+composite -stereo 0 $LEFTBNW $RIGHTBNW $DIFFPNG
+display $DIFFPNG
+rm $LEFTPNG
+rm $RIGHTPNG
+rm $LEFTBNW
+rm $RIGHTBNW
+rm $DIFFPNG
-- 
1.7.0.4