Add simple fnmatch filtering to spack list.

lib/spack/spack/cmd/list.py

@@ -22,15 +22,44 @@
 # along with this program; if not, write to the Free Software Foundation,
 # Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 ##############################################################################
+import sys
+import argparse
+import llnl.util.tty as tty
 from llnl.util.tty.colify import colify
+
 import spack
+import fnmatch
 
 description ="List available spack packages"
 
 def setup_parser(subparser):
-    pass
+    subparser.add_argument(
+        'filter', nargs=argparse.REMAINDER,
+        help='Optional glob patterns to filter results.')
+    subparser.add_argument(
+        '-i', '--insensitive', action='store_true', default=False,
+        help='Filtering will be case insensitive.')
 
 
 def list(parser, args):
+    # Start with all package names.
+    pkgs = spack.db.all_package_names()
+
+    # filter if a filter arg was provided
+    if args.filter:
+        def match(p, f):
+            if args.insensitive:
+                p = p.lower()
+                f = f.lower()
+            return fnmatch.fnmatchcase(p, f)
+        pkgs = [p for p in pkgs if any(match(p, f) for f in args.filter)]
+
+    # sort before displaying.
+    sorted_packages = sorted(pkgs, key=lambda s:s.lower())
+
     # Print all the package names in columns
-    colify(spack.db.all_package_names())
+    indent=0
+    if sys.stdout.isatty():
+        tty.msg("%d packages." % len(sorted_packages))
+        indent=2
+    colify(sorted_packages, indent=indent)