added module for simplified interface to libxmp

src/Makefile.am

@@ -608,6 +608,7 @@ filters/rclwar \
 filters/rclwpd \
 filters/rclxls.py \
 filters/rclxml.py \
+filters/rclxmp.py \
 filters/rclxslt.py \
 filters/rclzip \
 filters/ppt-dump.py \

src/filters/rclxmp.py

@@ -0,0 +1,68 @@
+#!/usr/bin/env python
+# Copyright (C) 2016 J.F.Dockes
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program; if not, write to the
+#   Free Software Foundation, Inc.,
+#   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+# Code to extract XMP tags using libexempi and python-xmp
+from __future__ import print_function
+
+can_xmp = True
+try:
+    import libxmp.utils
+except:
+    can_xmp = False
+
+import re
+import sys
+
+xmp_index_re = re.compile('''\[[0-9+]\]$''')
+#xmp_index_re = re.compile('''3''')
+
+def rclxmp_enabled():
+    return can_xmp
+
+def rclxmp(filename):
+    if not can_xmp:
+        return None, "python-xmp not accessible"
+    errstr = ""
+    try:
+        xmp = libxmp.utils.file_to_dict(filename)
+    except Exception as e:
+        errstr = str(e)
+
+    if errstr:
+        return None, errstr
+
+    out = {}
+    for ns in xmp.keys():
+        for entry in xmp[ns]:
+            if entry[1]:
+                k = xmp_index_re.sub('', entry[0])
+                if k.find("/") != -1:
+                    continue
+                if k in out:
+                    out[k] += " " + entry[1]
+                else:
+                    out[k] = entry[1]
+    return out, ""
+
+if __name__ == "__main__":
+    d, err = rclxmp(sys.argv[1])
+    if d:
+        print("Data: %s" % d)
+    else:
+        print("Error: %s" % err)
+        
+