shotwell migrate to xmp for digikam import

migrate_shotwell.py

@@ -0,0 +1,34 @@
+#!/usr/bin/python
+
+import os
+import sqlite3
+
+shotwell = sqlite3.connect(os.getenv('HOME', '.') + '/.local/share/shotwell/data/photo.db')
+shotwell.row_factory = sqlite3.Row
+
+for c in shotwell.execute('SELECT id, rating, filename FROM PhotoTable p'):
+    report = "thumb%0.16x\t" % c['id']
+    report += "%d\t%d\t" % ( c['id'], c['rating'] )
+    tags = [t['name'] for t in [tag for tag in shotwell.execute('SELECT name FROM TagTable WHERE photo_id_list LIKE ?', ('%%thumb%0.16x%%' % c['id'], ))]]
+    report += ",".join(tags)
+    report += "\t%s" % c['filename']
+    if len(tags) > 0:
+        #print(report)
+        # create exiv2 cmp file
+        cmd_file = c['filename'] + '.cmd'
+        f = open(cmd_file, "a")
+        for t in tags:
+            print("set Xmp.dc.subject XmpBag %s" % (t), file = f)
+            print("set Xmp.digiKam.TagsList %s" % (t), file = f)
+        f.close()
+        # create xmp sidecar
+        command = u'''exiv2 -eX -m "%s" "%s"''' % (cmd_file, c['filename'])
+        print(command)
+        good_sidecar = c['filename'] + '.xmp'
+        bad_sidecar = c['filename'][:-4] + '.xmp'
+        ret = os.system(command.encode('utf-8'))
+        if ret != 0:
+            print("warning: exiv command return %d, ran: %s" % (ret, command))
+        else:
+            os.rename(bad_sidecar, good_sidecar)
+        os.remove(cmd_file)