From 098460199c35218979e207a1709111e477ab9567 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 1 Oct 2015 09:13:37 +0200
Subject: build command genesis, some re-factoring

---
 bpkg/package.cxx | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

(limited to 'bpkg/package.cxx')

diff --git a/bpkg/package.cxx b/bpkg/package.cxx
index ad54e51..c6f5dcf 100644
--- a/bpkg/package.cxx
+++ b/bpkg/package.cxx
@@ -3,9 +3,12 @@
 // license   : MIT; see accompanying LICENSE file
 
 #include <bpkg/package>
+#include <bpkg/package-odb>
 
 #include <stdexcept> // invalid_argument
 
+#include <bpkg/database>
+
 using namespace std;
 
 namespace bpkg
@@ -34,6 +37,69 @@ namespace bpkg
     return xv.revision < yv.revision;
   }
 
+  // available_package
+  //
+
+  // Check if the package is available from the specified repository or
+  // one of its complements, recursively. Return the first repository
+  // that contains the package or NULL if none are.
+  //
+  static shared_ptr<repository>
+  find (const shared_ptr<repository>& r,
+        const shared_ptr<available_package>& ap)
+  {
+    const auto& cs (r->complements);
+
+    for (const package_location& pl: ap->locations)
+    {
+      // First check the repository itself.
+      //
+      if (pl.repository.object_id () == r->name)
+        return r;
+
+      // Then check all the complements without loading them.
+      //
+      if (cs.find (pl.repository) != cs.end ())
+        return pl.repository.load ();
+
+      // Finally, load the complements and check them recursively.
+      //
+      for (const lazy_shared_ptr<repository>& cr: cs)
+      {
+        if (shared_ptr<repository> r = find (cr.load (), ap))
+          return r;
+      }
+    }
+
+    return nullptr;
+  }
+
+  vector<shared_ptr<available_package>>
+  filter (const shared_ptr<repository>& r, result<available_package>&& apr)
+  {
+    vector<shared_ptr<available_package>> aps;
+
+    for (shared_ptr<available_package> ap: pointer_result (apr))
+    {
+      if (find (r, ap) != nullptr)
+        aps.push_back (move (ap));
+    }
+
+    return aps;
+  }
+
+  shared_ptr<available_package>
+  filter_one (const shared_ptr<repository>& r, result<available_package>&& apr)
+  {
+    for (shared_ptr<available_package> ap: pointer_result (apr))
+    {
+      if (find (r, ap) != nullptr)
+        return ap;
+    }
+
+    return nullptr;
+  }
+
   // state
   //
   string
-- 
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