configured target: support short representation

... with only the non-null entries of the configuration. This
information is enough for the user to build this target, e.g.,
when searching for the cause of a build failure.

2 files changed, 7 insertions, 0 deletions

diff --git a/src/buildtool/build_engine/target_map/TARGETS b/src/buildtool/build_engine/target_map/TARGETS
index 97576c2c..6964f19e 100644
--- a/src/buildtool/build_engine/target_map/TARGETS
+++ b/src/buildtool/build_engine/target_map/TARGETS
@@ -7,6 +7,7 @@
     , ["src/buildtool/build_engine/base_maps", "entity_name_data"]
     , ["src/buildtool/build_engine/expression", "expression"]
     , ["src/utils/cpp", "hash_combine"]
+    , ["src/utils/cpp", "json"]
     ]
   , "stage": ["src", "buildtool", "build_engine", "target_map"]
   }
diff --git a/src/buildtool/build_engine/target_map/configured_target.hpp b/src/buildtool/build_engine/target_map/configured_target.hpp
index b97b1912..e5713460 100644
--- a/src/buildtool/build_engine/target_map/configured_target.hpp
+++ b/src/buildtool/build_engine/target_map/configured_target.hpp
@@ -22,6 +22,7 @@
 #include "src/buildtool/build_engine/base_maps/entity_name_data.hpp"
 #include "src/buildtool/build_engine/expression/configuration.hpp"
 #include "src/utils/cpp/hash_combine.hpp"
+#include "src/utils/cpp/json.hpp"
 
 namespace BuildMaps::Target {
 
@@ -38,6 +39,11 @@ struct ConfiguredTarget {
     [[nodiscard]] auto ToString() const noexcept -> std::string {
         return fmt::format("[{},{}]", target.ToString(), config.ToString());
     }
+
+    [[nodiscard]] auto ToShortString() const noexcept -> std::string {
+        return fmt::format(
+            "[{},{}]", target.ToString(), PruneJson(config.ToJson()).dump());
+    }
 };
 
 using ConfiguredTargetPtr = std::shared_ptr<ConfiguredTarget>;