Fixes #460: Do not show variants by default in spack find.

This does two things:

1. By default `spack find` no longer shows variants.  You have to
   supply `-v` to get that

2. This improves the `colify` implementation so that it no longer pads
   the rightmost column.  This avoids the issue where if one spec was
   too long in the output, *all* specs would have space padding added
   to that width, and it would look like the output of `spack find`
   was double spaced.  This no longer happens -- the one bad line
   wraps around and the other lines are now single-spaced when you use
   `-v` with boost.

lib/spack/llnl/util/tty/colify.py

@@ -198,8 +198,13 @@ def colify(elts, **options):
         for col in xrange(cols):
             elt = col * rows + row
             width = config.widths[col] + cextra(elts[elt])
+            if col < cols - 1:
                 fmt = '%%-%ds' % width
                 output.write(fmt % elts[elt])
+            else:
+                # Don't pad the rightmost column (sapces can wrap on
+                # small teriminals if one line is overlong)
+                output.write(elts[elt])
 
         output.write("\n")
         row += 1

lib/spack/spack/cmd/find.py

@@ -86,6 +86,11 @@ def setup_parser(subparser):
         action='store_true',
         dest='missing',
         help='Show missing dependencies as well as installed specs.')
+    subparser.add_argument(
+        '-v', '--variants',
+        action='store_true',
+        dest='variants',
+        help='Show variants in output (can be long)')
     subparser.add_argument('-M', '--only-missing',
                            action='store_true',
                            dest='only_missing',
@@ -107,6 +112,8 @@ def display_specs(specs, **kwargs):
     mode = kwargs.get('mode', 'short')
     hashes = kwargs.get('long', False)
     namespace = kwargs.get('namespace', False)
+    flags = kwargs.get('show_flags', False)
+    variants = kwargs.get('variants', False)
 
     hlen = 7
     if kwargs.get('very_long', False):
@@ -114,10 +121,9 @@ def display_specs(specs, **kwargs):
         hlen = None
 
     nfmt = '.' if namespace else '_'
-    format_string = '$%s$@$+' % nfmt
-    flags = kwargs.get('show_flags', False)
-    if flags:
-        format_string = '$%s$@$%%+$+' % nfmt
+    ffmt = '$%+' if flags else ''
+    vfmt = '$+' if variants else ''
+    format_string = '$%s$@%s%s' % (nfmt, ffmt, vfmt)
 
     # Make a dict with specs keyed by architecture and compiler.
     index = index_by(specs, ('architecture', 'compiler'))
@@ -163,7 +169,7 @@ def fmt(s):
                     string = ""
                     if hashes:
                         string += gray_hash(s, hlen) + ' '
-                    string += s.format('$-%s$@$+' % nfmt, color=True)
+                    string += s.format('$-%s$@%s' % (nfmt, vfmt), color=True)
 
                     return string
 
@@ -238,4 +244,5 @@ def find(parser, args):
                   long=args.long,
                   very_long=args.very_long,
                   show_flags=args.show_flags,
-                  namespace=args.namespace)
+                  namespace=args.namespace,
+                  variants=args.variants)

lib/spack/spack/cmd/uninstall.py

@@ -39,6 +39,13 @@
     b) use spack uninstall -a to uninstall ALL matching specs.
 """
 
+# Arguments for display_specs when we find ambiguity
+display_args = {
+    'long': True,
+    'show_flags': True,
+    'variants':True
+}
+
 
 def ask_for_confirmation(message):
     while True:
@@ -92,7 +99,7 @@ def concretize_specs(specs, allow_multiple_matches=False, force=False):
         if not allow_multiple_matches and len(matching) > 1:
             tty.error("%s matches multiple packages:" % spec)
             print()
-            display_specs(matching, long=True, show_flags=True)
+            display_specs(matching, **display_args)
             print()
             has_errors = True
 
@@ -172,7 +179,7 @@ def uninstall(parser, args):
                 tty.error("Will not uninstall %s" % spec.format("$_$@$%@$#", color=True))
                 print('')
                 print("The following packages depend on it:")
-                display_specs(lst, long=True)
+                display_specs(lst, **display_args)
                 print('')
                 has_error = True
         elif args.dependents:
@@ -186,7 +193,7 @@ def uninstall(parser, args):
         if not args.yes_to_all:
             tty.msg("The following packages will be uninstalled : ")
             print('')
-            display_specs(uninstall_list, long=True, show_flags=True)
+            display_specs(uninstall_list, **display_args)
             print('')
             ask_for_confirmation('Do you want to proceed ? ')