Implement clean operation

1 files changed, 27 insertions, 0 deletions

diff --git a/build/algorithm.ixx b/build/algorithm.ixx
index e33566b..340789e 100644
--- a/build/algorithm.ixx
+++ b/build/algorithm.ixx
@@ -4,6 +4,15 @@
 
 namespace build
 {
+  target&
+  search_impl (prerequisite&);
+
+  inline target&
+  search (prerequisite& p)
+  {
+    return p.target != nullptr ? *p.target : search_impl (p);
+  }
+
   void
   match_impl (action, target&);
 
@@ -12,5 +21,23 @@ namespace build
   {
     if (!t.recipe (a))
       match_impl (a, t);
+
+    t.dependents++;
+  }
+
+  target_state
+  execute_impl (action, target&);
+
+  inline target_state
+  execute (action a, target& t)
+  {
+    t.dependents--;
+
+    switch (t.state)
+    {
+    case target_state::unchanged:
+    case target_state::changed: return t.state;
+    default: return execute_impl (a, t);
+    }
   }
 }