Get rid of action rule override semantics

Instead we now have two more or less separate match states for outer and
inner parts of an action.

3 files changed, 25 insertions, 25 deletions

diff --git a/build2/version/init.cxx b/build2/version/init.cxx
index 63e32ab..7b8bd01 100644
--- a/build2/version/init.cxx
+++ b/build2/version/init.cxx
@@ -27,8 +27,8 @@ namespace build2
   {
     static const path manifest ("manifest");
 
-    static const version_doc version_doc_;
-    static const version_in version_in_;
+    static const doc_rule doc_rule_;
+    static const in_rule in_rule_;
 
     bool
     boot (scope& rs, const location& l, unique_ptr<module_base>& mod)
@@ -311,13 +311,13 @@ namespace build2
       {
         auto& r (rs.rules);
 
-        r.insert<doc> (perform_update_id,   "version.doc", version_doc_);
-        r.insert<doc> (perform_clean_id,    "version.doc", version_doc_);
-        r.insert<doc> (configure_update_id, "version.doc", version_doc_);
+        r.insert<doc> (perform_update_id,   "version.doc", doc_rule_);
+        r.insert<doc> (perform_clean_id,    "version.doc", doc_rule_);
+        r.insert<doc> (configure_update_id, "version.doc", doc_rule_);
 
-        r.insert<file> (perform_update_id,   "version.in", version_in_);
-        r.insert<file> (perform_clean_id,    "version.in", version_in_);
-        r.insert<file> (configure_update_id, "version.in", version_in_);
+        r.insert<file> (perform_update_id,   "version.in", in_rule_);
+        r.insert<file> (perform_clean_id,    "version.in", in_rule_);
+        r.insert<file> (configure_update_id, "version.in", in_rule_);
       }
 
       return true;
diff --git a/build2/version/rule.cxx b/build2/version/rule.cxx
index 9e127ca..bbfe1f6 100644
--- a/build2/version/rule.cxx
+++ b/build2/version/rule.cxx
@@ -45,12 +45,12 @@ namespace build2
       return d == rs.src_path ();
     }
 
-    // version_doc
+    // doc_rule
     //
-    match_result version_doc::
+    bool doc_rule::
     match (action a, target& xt, const string&) const
     {
-      tracer trace ("version::version_doc::match");
+      tracer trace ("version::doc_rule::match");
 
       doc& t (static_cast<doc&> (xt));
 
@@ -76,7 +76,7 @@ namespace build2
       return false;
     }
 
-    recipe version_doc::
+    recipe doc_rule::
     apply (action a, target& xt) const
     {
       doc& t (static_cast<doc&> (xt));
@@ -101,7 +101,7 @@ namespace build2
       }
     }
 
-    target_state version_doc::
+    target_state doc_rule::
     perform_update (action a, const target& xt)
     {
       const doc& t (xt.as<const doc&> ());
@@ -168,12 +168,12 @@ namespace build2
       return target_state::changed;
     }
 
-    // version_in
+    // in_rule
     //
-    match_result version_in::
+    bool in_rule::
     match (action a, target& xt, const string&) const
     {
-      tracer trace ("version::version_in::match");
+      tracer trace ("version::in_rule::match");
 
       file& t (static_cast<file&> (xt));
       const scope& rs (t.root_scope ());
@@ -195,7 +195,7 @@ namespace build2
       return fm && fi;
     }
 
-    recipe version_in::
+    recipe in_rule::
     apply (action a, target& xt) const
     {
       file& t (static_cast<file&> (xt));
@@ -220,10 +220,10 @@ namespace build2
       }
     }
 
-    target_state version_in::
+    target_state in_rule::
     perform_update (action a, const target& xt)
     {
-      tracer trace ("version::version_in::perform_update");
+      tracer trace ("version::in_rule::perform_update");
 
       const file& t (xt.as<const file&> ());
       const path& tp (t.path ());
diff --git a/build2/version/rule.hxx b/build2/version/rule.hxx
index e686694..9172ba3 100644
--- a/build2/version/rule.hxx
+++ b/build2/version/rule.hxx
@@ -16,12 +16,12 @@ namespace build2
   {
     // Generate a version file.
     //
-    class version_doc: public rule
+    class doc_rule: public rule
     {
     public:
-      version_doc () {}
+      doc_rule () {}
 
-      virtual match_result
+      virtual bool
       match (action, target&, const string&) const override;
 
       virtual recipe
@@ -33,12 +33,12 @@ namespace build2
 
     // Preprocess an .in file.
     //
-    class version_in: public rule
+    class in_rule: public rule
     {
     public:
-      version_in () {}
+      in_rule () {}
 
-      virtual match_result
+      virtual bool
       match (action, target&, const string&) const override;
 
       virtual recipe