Add in{} target type for .in ("input") file (requires preprocessing)

1 files changed, 43 insertions, 0 deletions

diff --git a/build2/target.cxx b/build2/target.cxx
index e0f4e55..e1712b9 100644
--- a/build2/target.cxx
+++ b/build2/target.cxx
@@ -1008,6 +1008,49 @@ namespace build2
     false
   };
 
+  // in
+  //
+  static const target*
+  in_search (const target& xt, const prerequisite_key& cpk)
+  {
+    // If we have no extension then derive it from our target. The delegate
+    // to file_search().
+    //
+    prerequisite_key pk (cpk);
+    optional<string>& e (pk.tk.ext);
+
+    if (!e)
+    {
+      if (const file* t = xt.is_a<file> ())
+      {
+        const string& te (t->derive_extension ());
+        e = te + (te.empty () ? "" : ".") + "in";
+      }
+      else
+        fail << "prerequisite " << pk << " for a non-file target " << xt;
+    }
+
+    return file_search (xt, pk);
+  }
+
+  static bool
+  in_pattern (const target_type&, const scope&, string&, bool)
+  {
+    fail << "pattern in in{} prerequisite" << endf;
+  }
+
+  const target_type in::static_type
+  {
+    "in",
+    &file::static_type,
+    &file_factory<in, file_ext_def>, // No extension by default.
+    &target_extension_assert,        // Should be taken care by search.
+    &in_pattern,
+    &target_print_1_ext_verb,        // Same as file.
+    &in_search,
+    false
+  };
+
   const target_type doc::static_type
   {
     "doc",