cli/graph: Add option to generate reverse dependency graph

pisi/api.py

@@ -612,7 +612,7 @@ def get_package_requirements(packages):
 
 # ****** Danger Zone Below! Tressspassers' eyes will explode! ********** #
 
-def package_graph(A, packagedb, ignore_installed = False):
+def package_graph(A, packagedb, ignore_installed = False, reverse=False):
     """Construct a package relations graph.
 
     Graph will contain all dependencies of packages A, if ignore_installed
@@ -638,13 +638,22 @@ def package_graph(A, packagedb, ignore_installed = False):
         for x in B:
             pkg = packagedb.get_package(x)
             #print pkg
-            for dep in pkg.runtimeDependencies():
-                if ignore_installed:
-                    if dep.satisfied_by_installed():
-                        continue
-                if not dep.package in G_f.vertices():
-                    Bp.add(str(dep.package))
-                G_f.add_dep(x, dep)
+            if reverse:
+                for name,dep in packagedb.get_rev_deps(x):
+                    if ignore_installed:
+                        if dep.satisfied_by_installed():
+                            continue
+                    if not name in G_f.vertices():
+                        Bp.add(name)
+                    G_f.add_dep(name, dep)
+            else:
+                for dep in pkg.runtimeDependencies():
+                    if ignore_installed:
+                        if dep.satisfied_by_installed():
+                            continue
+                    if not dep.package in G_f.vertices():
+                        Bp.add(str(dep.package))
+                    G_f.add_dep(x, dep)
         B = Bp
     return G_f
 

pisi/cli/graph.py

@@ -51,6 +51,9 @@ the package in graphviz format to 'pgraph.dot'.
         group.add_option("--ignore-installed", action="store_true",
                                default=False,
                                help=_("Do not show installed packages"))
+        group.add_option("-R", "--reverse", action="store_true",
+                               default=False,
+                               help=_("Draw reverse dependency graph"))
         group.add_option("-o", "--output", action="store",
                                default='pgraph.dot',
                                help=_("Dot output file"))
@@ -88,5 +91,5 @@ the package in graphviz format to 'pgraph.dot'.
                 a = pisi.api.list_installed()
 
         g = pisi.api.package_graph(a, packagedb,
-                                   ignore_installed = ctx.get_option('ignore_installed'))
+                                   ignore_installed = ctx.get_option('ignore_installed'), reverse = ctx.get_option('reverse'))
         g.write_graphviz(file(ctx.get_option('output'), 'w'))