Add extensions command.

6 files changed, 26 insertions, 7 deletions

diff --git a/lib/spack/llnl/util/link_tree.py b/lib/spack/llnl/util/link_tree.py
index 887f6f4d26..4e4e48316e 100644
--- a/lib/spack/llnl/util/link_tree.py
+++ b/lib/spack/llnl/util/link_tree.py
@@ -27,7 +27,7 @@ __all__ = ['LinkTree']
 
 import os
 import shutil
-from llnl.util.filesystem import mkdirp
+from llnl.util.filesystem import *
 
 empty_file_name = '.spack-empty'
 
@@ -93,6 +93,7 @@ def traverse_tree(source_root, dest_root, rel_path='', **kwargs):
     for f in os.listdir(source_path):
         source_child = os.path.join(source_path, f)
         dest_child   = os.path.join(dest_path, f)
+        rel_child    = os.path.join(rel_path, f)
 
         # Treat as a directory
         if os.path.isdir(source_child) and (
@@ -101,7 +102,7 @@ def traverse_tree(source_root, dest_root, rel_path='', **kwargs):
             # When follow_nonexisting isn't set, don't descend into dirs
             # in source that do not exist in dest
             if follow_nonexisting or os.path.exists(dest_child):
-                tuples = traverse_tree(source_child, dest_child, rel_path, **kwargs)
+                tuples = traverse_tree(source_root, dest_root, rel_child, **kwargs)
                 for t in tuples: yield t
 
         # Treat as a file.
diff --git a/lib/spack/spack/cmd/extensions.py b/lib/spack/spack/cmd/extensions.py
index 961d7e3f24..f28a388bf2 100644
--- a/lib/spack/spack/cmd/extensions.py
+++ b/lib/spack/spack/cmd/extensions.py
@@ -26,6 +26,7 @@ import sys
 from external import argparse
 
 import llnl.util.tty as tty
+from llnl.util.tty.colify import colify
 
 import spack
 import spack.cmd
@@ -66,10 +67,10 @@ def extensions(parser, args):
 
     exts = spack.install_layout.get_extensions(spec)
     if not exts:
-        tty.msg("%s has no activated extensions." % spec.short_spec)
+        tty.msg("%s has no activated extensions." % spec.cshort_spec)
     else:
-        tty.msg("Showing %d activated extension%s for package:"
-                % (len(exts), 's' if len(exts) > 1 else ''),
-                spec.short_spec)
+        tty.msg("Extensions for package %s:" % spec.cshort_spec)
+        colify(pkg.name for pkg in spack.db.extensions_for(spec))
         print
+        tty.msg("%d currently activated:" % len(exts))
         spack.cmd.find.display_specs(exts, mode=args.mode)
diff --git a/lib/spack/spack/directory_layout.py b/lib/spack/spack/directory_layout.py
index ff327ed504..efc40a17a4 100644
--- a/lib/spack/spack/directory_layout.py
+++ b/lib/spack/spack/directory_layout.py
@@ -269,8 +269,8 @@ class SpecHashDirectoryLayout(DirectoryLayout):
     def get_extensions(self, spec):
         _check_concrete(spec)
 
-        path = self.extension_file_path(spec)
         extensions = set()
+        path = self.extension_file_path(spec)
         if os.path.exists(path):
             with closing(open(path)) as ext_file:
                 for line in ext_file:
diff --git a/lib/spack/spack/package.py b/lib/spack/spack/package.py
index 0b6bc4ce6c..b905968540 100644
--- a/lib/spack/spack/package.py
+++ b/lib/spack/spack/package.py
@@ -522,6 +522,11 @@ class Package(object):
         return len(self.extendees) > 0
 
 
+    def extends(self, spec):
+        return (spec.name in self.extendees and
+                spec.satisfies(self.extendees[spec.name][0]))
+
+
     @property
     def activated(self):
         if not self.spec.concrete:
diff --git a/lib/spack/spack/packages.py b/lib/spack/spack/packages.py
index bb5a94bcab..b3049e812f 100644
--- a/lib/spack/spack/packages.py
+++ b/lib/spack/spack/packages.py
@@ -112,6 +112,11 @@ class PackageDB(object):
         return providers
 
 
+    @_autospec
+    def extensions_for(self, extendee_spec):
+        return [p for p in self.all_packages() if p.extends(extendee_spec)]
+
+
     def dirname_for_package_name(self, pkg_name):
         """Get the directory name for a particular package.  This is the
            directory that contains its package.py file."""
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 2f4fe9ca24..dffdccaddb 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -553,6 +553,13 @@ class Spec(object):
 
 
     @property
+    def cshort_spec(self):
+        """Returns a version of the spec with the dependencies hashed
+           instead of completely enumerated."""
+        return self.format('$_$@$%@$+$=$#', color=True)
+
+
+    @property
     def prefix(self):
         return Prefix(spack.install_layout.path_for_spec(self))