just analyse: support dumping the provides map of a target

2 files changed, 29 insertions, 0 deletions

diff --git a/src/buildtool/common/cli.hpp b/src/buildtool/common/cli.hpp
index 3409eae8..b1633716 100644
--- a/src/buildtool/common/cli.hpp
+++ b/src/buildtool/common/cli.hpp
@@ -78,6 +78,7 @@ struct DiagnosticArguments {
     std::optional<std::string> dump_actions{std::nullopt};
     std::optional<std::string> dump_blobs{std::nullopt};
     std::optional<std::string> dump_trees{std::nullopt};
+    std::optional<std::string> dump_provides{std::nullopt};
     std::optional<std::string> dump_vars{std::nullopt};
     std::optional<std::string> dump_targets{std::nullopt};
     std::optional<std::string> dump_export_targets{std::nullopt};
@@ -344,6 +345,10 @@ static inline auto SetupDiagnosticArguments(
                     clargs->dump_blobs,
                     "Dump blobs to file (use - for stdout).")
         ->type_name("PATH");
+    app->add_option("--dump-provides",
+                    clargs->dump_provides,
+                    "Dump provides map to file (use - for stdout).")
+        ->type_name("PATH");
     app->add_option("--dump-vars",
                     clargs->dump_vars,
                     "Dump domain of the effective configuration to file (use - "
diff --git a/src/buildtool/main/diagnose.cpp b/src/buildtool/main/diagnose.cpp
index 1c3552cd..0595970d 100644
--- a/src/buildtool/main/diagnose.cpp
+++ b/src/buildtool/main/diagnose.cpp
@@ -134,6 +134,27 @@ void DumpTrees(std::string const& file_path, AnalysisResult const& result) {
     }
 }
 
+void DumpProvides(std::string const& file_path, AnalysisResult const& result) {
+    auto const dump_string =
+        result.target->Result()
+            .provides->ToJson(Expression::JsonMode::SerializeAllButNodes)
+            .dump(2);
+    if (file_path == "-") {
+        Logger::Log(LogLevel::Info,
+                    "Provides map for target {}:",
+                    result.id.ToString());
+        std::cout << dump_string << std::endl;
+    }
+    else {
+        Logger::Log(LogLevel::Info,
+                    "Dumping provides map for target {} to file '{}'.",
+                    result.id.ToString(),
+                    file_path);
+        std::ofstream os(file_path);
+        os << dump_string << std::endl;
+    }
+}
+
 void DumpTargets(std::string const& file_path,
                  std::vector<Target::ConfiguredTarget> const& target_ids,
                  std::string const& target_qualifier = "") {
@@ -287,6 +308,9 @@ void DiagnoseResults(AnalysisResult const& result,
     if (clargs.dump_trees) {
         DumpTrees(*clargs.dump_trees, result);
     }
+    if (clargs.dump_provides) {
+        DumpProvides(*clargs.dump_provides, result);
+    }
     if (clargs.dump_vars) {
         DumpVars(*clargs.dump_vars, result);
     }