diff options
| -rw-r--r-- | pym/_emerge/depgraph.py | 77 |
1 files changed, 66 insertions, 11 deletions
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py index 686015bc5..94914b980 100644 --- a/pym/_emerge/depgraph.py +++ b/pym/_emerge/depgraph.py @@ -4168,17 +4168,72 @@ class depgraph(object): if ppkg == parent: parent_atom = atom.unevaluated_atom break - use_enabled, use_disabled = portage.dep.extract_use_cond(dep, parent_atom) - if use_enabled: - for flag in use_enabled: - if flag in parent.use.enabled: - suggestions.append("- %s (Change USE: %s)\n" \ - % (parent.cpv, colorize("blue", "-" + flag))) - if use_disabled: - for flag in use_enabled: - if flag not in parent.use.enabled: - suggestions.append("- %s (Change USE: %s)\n" \ - % (parent.cpv, colorize("red", "+" + flag))) + affecting_use = list(portage.dep.extract_affecting_use(dep, parent_atom)) + + if affecting_use: + #We iterate over all possible settings of these use flags and gather + #a set of possible changes + use_state = [] + for flag in affecting_use: + use_state.append("disabled") + + def _next_use_state(state, id=None): + if id is None: + id = len(state)-1 + + if id == 0 and state[0] == "enabled": + return False + + if state[id] == "disabled": + state[id] = "enabled" + for i in range(id+1,len(state)): + state[i] = "disabled" + return True + else: + return _next_use_state(state, id-1) + + solutions = set() + while(True): + current_use = [] + for flag, state in zip(affecting_use, use_state): + if state == "enabled": + current_use.append(flag) + reduced_dep = portage.dep.flatten( \ + portage.dep.use_reduce(portage.dep.paren_reduce(dep), current_use)) + + if parent_atom not in reduced_dep: + #we found a valid solution + solution = [] + for flag, state in zip(affecting_use, use_state): + if state == "enabled" and \ + flag not in parent.use.enabled: + solution.append("+" + flag) + elif state == "disabled" and \ + flag in parent.use.enabled: + solution.append("-" + flag) + solutions.add(frozenset(solution)) + if not _next_use_state(use_state): + break + + for solution in solutions: + ignore_solution = False + for other_solution in solutions: + if solution is other_solution: + continue + if solution.issuperset(other_solution): + ignore_solution = True + if ignore_solution: + continue + + changes = [] + for flag in solution: + if flag.startswith("+"): + changes.append(colorize("red", flag)) + else: + changes.append(colorize("blue", flag)) + + suggestions.append("- %s (Change USE: %s)\n" \ + % (parent.cpv, " ".join(changes))) indent += " " |