add weak_deps option to alpm

inst/service/backend/alpm.py

@@ -54,11 +54,14 @@ def _update(handle):
         db.update(False)
     _db_sync = False
 
-def _install(handle, t, repos, name):
+def _install(handle, t, repos, weak_deps, name):
     ok, pkg = pycman.action_sync.find_sync_package(name, repos)
     t.add_pkg(pkg)
+    if weak_deps == True:
+        for optdep in pkg.optdepends:
+            t.add_pkg(optdep)
 
-def _remove(handle, t, repos, name):
+def _remove(handle, t, repos, weak_deps, name):
     pkg = handle.get_localdb().get_pkg(name)
     t.remove_pkg(pkg)
 
@@ -82,13 +85,13 @@ def available(prefixes, exclusions):
 
     return pkgs
 
-def operation(op, prefixes, pkgs, exclusions):
+def operation(op, prefixes, pkgs, exclusions, weak_deps=None):
     handle = _get_handle()
     repos = dict((db.name, db) for db in handle.get_syncdbs())
     t = handle.init_transaction()
     _update(handle)
 
-    fun = partial(op, handle, t, repos)
+    fun = partial(op, handle, t, repos, weak_deps)
     notavail = mark(fun, prefixes, pkgs, exclusions, trans="lower")
 
     try:
@@ -100,8 +103,8 @@ def operation(op, prefixes, pkgs, exclusions):
 
     return notavail
 
-def install(prefixes, pkgs, exclusions):
-    return operation(_install, prefixes, pkgs, exclusions)
+def install(prefixes, pkgs, exclusions, weak_deps=None):
+    return operation(_install, prefixes, pkgs, exclusions, weak_deps)
 
 def remove(prefixes, pkgs, exclusions):
     return operation(_remove, prefixes, pkgs, exclusions)