add ability to search tags.. giving a tag, return all the tag=value pairs..

not sure how I want to handle spaces or escaping other characters. for now,
don't

ui/fixtures/cmd.search.json

@@ -78,5 +78,20 @@
 	"title": "search other, mapped properly",
 	"cmd": [ "search", "file", "+other" ],
 	"stdout_re": "^/foobar/test.txt\n$"
+},
+{
+	"title": "add tag with space",
+	"cmd": [ "modify", "+tag=car baz", "test.txt" ]
+},
+{
+	"title": "search tags",
+	"cmd": [ "search", "tags", "tag" ],
+	"stdout": "tag=bar\ntag=car baz\ntag=foo\n"
+},
+{
+	"title": "search bogus",
+	"cmd": [ "search", "lskdjflaskjdoijef", "tag" ],
+	"exit": 1,
+	"stderr": "unknown search type: 'lskdjflaskjdoijef'\n"
 }
 ]

ui/medashare/cli.py

@@ -1574,6 +1574,23 @@ def cmd_search(options, persona, objstr, cache):
 
 	_type = args.pop(0)
 
+	if _type == 'tags':
+		propmap = aliased(orm.PropertyMapping)
+		skeymap = aliased(orm.StringTable)
+		svaluemap = aliased(orm.StringTable)
+
+		q = select(skeymap.str, svaluemap.str).where(propmap.keyid == skeymap.id).where(skeymap.str == args[0]).where(propmap.valueid == svaluemap.id).distinct().order_by(svaluemap.str)
+		_debprint(repr(q))
+		with objstr._ses() as session:
+			for k, v in session.execute(q):
+				print('%s=%s' % (k, v))
+		return
+
+	if _type != 'file':
+		print('unknown search type: %s' % repr(_type),
+		    file=sys.stderr)
+		sys.exit(1)
+
 	searches = [ (x[0], ) + tuple(x[1:].split('=', 1)) for x in args ]
 	#_debprint(repr(searches))