ext-plugins/lib-general: string_{list,set} + conversion filter

+ start respective unit tests
+ fix faulty format passing logic as observed with the new plugins

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/ext-plugins/lib-general/filters/stringlist2stringset.py b/ext-plugins/lib-general/filters/stringlist2stringset.py
new file mode 100644
index 0000000..eff86fa
--- /dev/null
+++ b/ext-plugins/lib-general/filters/stringlist2stringset.py
@@ -0,0 +1,13 @@
+# -*- coding: UTF-8 -*-
+# Copyright 2014 Red Hat, Inc.
+# Part of clufter project
+# Licensed under GPLv2+ (a copy included | http://gnu.org/licenses/gpl-2.0.txt)
+"""stringlist2stringset filter"""
+__author__ = "Jan Pokorný <jpokorny @at@ Red Hat .dot. com>"
+
+from ..filter import Filter
+
+@Filter.deco('string-iter', 'string-set')
+def stringlist2stringset(flt_ctxt, in_obj):
+    """Downgrades list to a set (order not preserved)"""
+    return ('stringset', set(in_obj('stringiter', protect_safe=True)))
diff --git a/ext-plugins/lib-general/formats/string_iter.py b/ext-plugins/lib-general/formats/string_iter.py
new file mode 100644
index 0000000..20e42ba
--- /dev/null
+++ b/ext-plugins/lib-general/formats/string_iter.py
@@ -0,0 +1,40 @@
+# -*- coding: UTF-8 -*-
+# Copyright 2014 Red Hat, Inc.
+# Part of clufter project
+# Licensed under GPLv2+ (a copy included | http://gnu.org/licenses/gpl-2.0.txt)
+"""Format representing a list of strings (new-line delimited)"""
+__author__ = "Jan Pokorný <jpokorny @at@ Red Hat .dot. com>"
+
+from ..format import SimpleFormat
+from ..protocol import Protocol
+
+
+class string_iter(SimpleFormat):
+    native_protocol = STRINGITER = Protocol('stringiter')
+    BYTESTRING = SimpleFormat.BYTESTRING
+
+    @SimpleFormat.producing(BYTESTRING, chained=True)
+    def get_bytestring(self, *protodecl):
+        """Return command as canonical single string"""
+        # chained fallback
+        return '\n'.join(s for s in self.STRINGITER(protect_safe=True) if s)
+
+    @SimpleFormat.producing(STRINGITER, protect=True)
+    def get_stringiter(self, *protodecl):
+        return (s.strip() for s in (self.BYTESTRING().rstrip('\n')).split('\n'))
+
+
+class string_list(string_iter):
+    native_protocol = STRINGLIST = Protocol('stringlist')
+
+    @SimpleFormat.producing(STRINGLIST, protect=True)
+    def get_stringlist(self, *protodecl):
+        return list(self.STRINGITER(protect_safe=True))
+
+
+class string_set(string_iter):
+    native_protocol = STRINGSET = Protocol('stringset')
+
+    @SimpleFormat.producing(STRINGSET, protect=True)
+    def get_stringset(self, *protodecl):
+        return set(self.STRINGITER(protect_self=True))