5 files changed, 79 insertions, 11 deletions

diff --git a/mod/mod-build-result.cxx b/mod/mod-build-result.cxx
index 7023e39..22613eb 100644
--- a/mod/mod-build-result.cxx
+++ b/mod/mod-build-result.cxx
@@ -191,6 +191,13 @@ handle (request& rq, response&)
   shared_ptr<build_package> pkg;
   const build_package_config* cfg (nullptr);
 
+  // True if the built package version is the latest buildable version of this
+  // package in the tenant.
+  //
+  // Note: is only meaningful if bld is not NULL.
+  //
+  bool latest_version (false);
+
   bool build_notify (false);
   bool unforced (true);
 
@@ -470,7 +477,27 @@ handle (request& rq, response&)
             build_db_->load (*pkg, pkg->constraints_section);
 
             if (!exclude (*cfg, pkg->builds, pkg->constraints, *tc))
+            {
               bld = b;
+
+              // While at it, check if the built package version is the latest
+              // buildable version of this package.
+              //
+              // Ideally we would like to avoid this query unless necessary
+              // (mode is latest and package manifest has build-*-email
+              // values), but that will make things quite hairy so let's
+              // keep it simple for now.
+              //
+              const auto& id (query<buildable_package>::build_package::id);
+
+              buildable_package p (
+                build_db_->query_value<buildable_package> (
+                  (id.tenant == b->tenant && id.name == b->package_name) +
+                  order_by_version_desc (id.version)                     +
+                  "LIMIT 1"));
+
+              latest_version = (p.package->version == b->package_version);
+            }
           }
         }
         else
@@ -529,13 +556,15 @@ handle (request& rq, response&)
     return true;
 
   // Bail out if sending build notification emails is disabled for this
-  // toolchain.
+  // toolchain for this package.
   //
   {
-    const map<string, bool>& tes (options_->build_toolchain_email ());
-
+    const map<string, build_email>& tes (options_->build_toolchain_email ());
     auto i (tes.find (bld->id.toolchain_name));
-    if (i != tes.end () && !i->second)
+    build_email mode (i != tes.end () ? i->second : build_email::latest);
+
+    if (mode == build_email::none ||
+        (mode == build_email::latest && !latest_version))
       return true;
   }
 
diff --git a/mod/module.cli b/mod/module.cli
index 3e81b38..552a60b 100644
--- a/mod/module.cli
+++ b/mod/module.cli
@@ -586,15 +586,18 @@ namespace brep
          default is 10M."
       }
 
-      std::map<string, bool> build-toolchain-email
+      std::map<string, build_email> build-toolchain-email
       {
-        "<name>=<bool>",
-        "Enable or disable package build notification emails. If \cb{true} is
+        "<name>=<mode>",
+        "Enable or disable package build notification emails. The valid <mode>
+         values are \cb{none}, \cb{latest}, and \cb{all}. If \cb{all} is
          specified for a toolchain name, then emails are sent according to the
-         \cb{build-*email} package manifest values when the package is built
-         with this toolchain. If \cb{false} is specified, then no emails are
-         sent for this toolchain name. By default build notification emails
-         are enabled. Repeat this option to enable/disable emails for multiple
+         \cb{build-*email} package manifest values when all versions of a
+         package are built with this toolchain. If \cb{latest} is specified,
+         then for this toolchain name the emails are only sent for the latest
+         version of a package. If \cb{none} is specified, then no emails are
+         sent for this toolchain name. By default the \cb{latest} mode is
+         assumed. Repeat this option to enable/disable emails for multiple
          toolchains. See \l{bpkg#manifest-package Package Manifest} for
          details on \cb{build-*email} values."
       }
diff --git a/mod/options-types.hxx b/mod/options-types.hxx
index dc1047d..f2b059b 100644
--- a/mod/options-types.hxx
+++ b/mod/options-types.hxx
@@ -31,6 +31,13 @@ namespace brep
     stable,
     random
   };
+
+  enum class build_email
+  {
+    none,
+    latest, // Only send emails for the latest package versions.
+    all
+  };
 }
 
 #endif // MOD_OPTIONS_TYPES_HXX
diff --git a/mod/types-parsers.cxx b/mod/types-parsers.cxx
index 34a8bac..60d70d7 100644
--- a/mod/types-parsers.cxx
+++ b/mod/types-parsers.cxx
@@ -261,5 +261,27 @@ namespace brep
       else
         throw invalid_value (o, v);
     }
+
+    // Parse build_email.
+    //
+    void parser<build_email>::
+    parse (build_email& x, bool& xs, scanner& s)
+    {
+      xs = true;
+      const char* o (s.next ());
+
+      if (!s.more ())
+        throw missing_value (o);
+
+      const string v (s.next ());
+      if (v == "none")
+        x = build_email::none;
+      else if (v == "latest")
+        x = build_email::latest;
+      else if (v == "all")
+        x = build_email::all;
+      else
+        throw invalid_value (o, v);
+    }
   }
 }
diff --git a/mod/types-parsers.hxx b/mod/types-parsers.hxx
index f10100c..d48ae0b 100644
--- a/mod/types-parsers.hxx
+++ b/mod/types-parsers.hxx
@@ -99,6 +99,13 @@ namespace brep
       static void
       parse (build_order&, bool&, scanner&);
     };
+
+    template <>
+    struct parser<build_email>
+    {
+      static void
+      parse (build_email&, bool&, scanner&);
+    };
   }
 }