metadata.py: Don't fail on unmatched package

Added a warning hook too to reuse the GentoolkitNoMatches machinery

This allows users to do something like:
  equery list @selected | xargs equery metadata
successfuly, even if there are some selected packages that don't exist
anymore.

Signed-off-by: Marco Sirabella <marco@sirabella.org>
Signed-off-by: Brian Dolbec <dolsen@gentoo.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/bin/equery b/bin/equery
index 0e52294..3b3e850 100755
--- a/bin/equery
+++ b/bin/equery
@@ -29,6 +29,16 @@ except KeyboardInterrupt:
     sys.exit(1)
 
 from gentoolkit import equery, errors
+import warnings
+
+
+def formatwarning(message, category, filename, llineno, line=None):
+    from gentoolkit import pprinter as pp
+    return pp.warn(str(message))
+
+
+if '--debug' not in sys.argv and not bool(os.getenv('DEBUG', False)):
+    warnings.formatwarning = formatwarning
 
 try:
     equery.main(sys.argv)