Better info command.

lib/spack/spack/cmd/info.py

@@ -1,5 +1,9 @@
+import re
+import textwrap
+
 import spack
 import spack.packages as packages
+from spack.colify import colify
 
 description = "Build and install packages"
 
@@ -9,5 +13,31 @@ def setup_parser(subparser):
 
 def info(parser, args):
     package = packages.get(args.name)
+    print "Package:   ", package.name
     print "Homepage:  ", package.homepage
     print "Download:  ", package.url
+
+    print
+    print "Dependencies:"
+    if package.dependencies:
+        colify(package.dependencies, indent=4)
+    else:
+        print "    None"
+
+    print
+    print "Virtual packages: "
+    if package.provided:
+        for spec, when in package.provided.items():
+            print "    %s provides %s" % (when, spec)
+    else:
+        print "    None"
+
+    print
+    print "Description:"
+    if package.__doc__:
+        doc = re.sub(r'\s+', ' ', package.__doc__)
+        lines = textwrap.wrap(doc, 72)
+        for line in lines:
+            print "    " + line
+    else:
+        print "    None"

lib/spack/spack/packages/mpich.py

@@ -1,6 +1,9 @@
 from spack import *
 
 class Mpich(Package):
+    """MPICH is a high performance and widely portable implementation of
+       the Message Passing Interface (MPI) standard."""
+
     homepage = "http://www.mpich.org"
     url      = "http://www.mpich.org/static/downloads/3.0.4/mpich-3.0.4.tar.gz"
     md5      = "9c5d5d4fe1e17dd12153f40bc5b6dbc0"
@@ -8,6 +11,11 @@ class Mpich(Package):
     list_url   = "http://www.mpich.org/static/downloads/"
     list_depth = 2
 
+    versions = ['3.0.4', '3.0.3', '3.0.2', '3.0.1', '3.0']
+
+    provides('mpi@:3', when='@3:')
+    provides('mpi@:1', when='@1:')
+
     def install(self, prefix):
         configure("--prefix=%s" % prefix)
         make()