[M6] populate Cargoxx.toml; add 'cargoxx linkdb add' CLI; codegen fixes for self-host

src/cli/cli.cppm

@@ -53,6 +53,17 @@ auto cmd_add(const std::filesystem::path& project_root, const std::string& name,
 auto cmd_remove(const std::filesystem::path& project_root, const std::string& name)
     -> util::Result<void>;
 
+// Inserts a manual recipe into the SQLite linkdb overlay. Equivalent to
+// the auto-discover path's confirmed row, but user-provided. Use it
+// when nixpkgs ships a CMake FindModule (no <X>Config.cmake) or when the
+// scanner can't pick the right target automatically.
+auto cmd_linkdb_add(const std::string& package, const std::string& version_range,
+                    const std::string& find_package_text,
+                    std::vector<std::string> targets,
+                    const std::string& nixpkgs_attr,
+                    std::optional<std::filesystem::path> overlay_path = std::nullopt)
+    -> util::Result<void>;
+
 auto run(int argc, char** argv) -> int;
 
 } // namespace cargoxx::cli

src/cli/cmd_linkdb_add.cpp

@@ -0,0 +1,31 @@
+module cargoxx.cli;
+
+import std;
+import cargoxx.linkdb;
+import cargoxx.util;
+
+namespace cargoxx::cli {
+
+auto cmd_linkdb_add(const std::string& package, const std::string& version_range,
+                    const std::string& find_package_text,
+                    std::vector<std::string> targets,
+                    const std::string& nixpkgs_attr,
+                    std::optional<std::filesystem::path> overlay_path)
+    -> util::Result<void> {
+    auto db = linkdb::Database::open(std::move(overlay_path));
+    if (!db) {
+        return std::unexpected(db.error());
+    }
+    if (auto r = db->evict_auto_recipes(package); !r) {
+        return std::unexpected(r.error());
+    }
+    linkdb::Recipe r{
+        .nixpkgs_attr = nixpkgs_attr,
+        .find_package = find_package_text,
+        .targets = std::move(targets),
+        .source = "manual",
+    };
+    return db->add_manual(package, version_range, r);
+}
+
+} // namespace cargoxx::cli

src/cli/run.cpp

@@ -58,6 +58,28 @@ auto run(int argc, char** argv) -> int {
     std::string remove_name;
     remove_cmd->add_option("name", remove_name, "Package name to remove")->required();
 
+    auto* linkdb_cmd =
+        app.add_subcommand("linkdb", "Manage the link database");
+    linkdb_cmd->require_subcommand(1);
+    auto* linkdb_add_cmd =
+        linkdb_cmd->add_subcommand("add", "Insert a manual recipe");
+    std::string ldb_package;
+    std::string ldb_version = "*";
+    std::string ldb_find_package;
+    std::string ldb_targets;
+    std::string ldb_nixpkgs_attr;
+    linkdb_add_cmd->add_option("package", ldb_package, "Package name")->required();
+    linkdb_add_cmd->add_option("--version", ldb_version, "Version range (default: *)");
+    linkdb_add_cmd->add_option("--find-package", ldb_find_package,
+                                "Body of the find_package(...) call (e.g. \"fmt CONFIG REQUIRED\")")
+        ->required();
+    linkdb_add_cmd->add_option("--targets", ldb_targets,
+                                "Comma-separated CMake targets (e.g. fmt::fmt)")
+        ->required();
+    linkdb_add_cmd->add_option("--nixpkgs-attr", ldb_nixpkgs_attr,
+                                "nixpkgs attribute name (e.g. fmt_10)")
+        ->required();
+
     try {
         app.parse(argc, argv);
     } catch (const CLI::ParseError& e) {
@@ -175,6 +197,31 @@ auto run(int argc, char** argv) -> int {
         return 0;
     }
 
+    if (*linkdb_add_cmd) {
+        std::vector<std::string> targets;
+        std::size_t pos = 0;
+        while (pos <= ldb_targets.size()) {
+            auto comma = ldb_targets.find(',', pos);
+            auto piece = ldb_targets.substr(
+                pos, comma == std::string::npos ? ldb_targets.size() - pos : comma - pos);
+            if (!piece.empty()) {
+                targets.push_back(std::move(piece));
+            }
+            if (comma == std::string::npos) {
+                break;
+            }
+            pos = comma + 1;
+        }
+        auto r = cmd_linkdb_add(ldb_package, ldb_version, ldb_find_package,
+                                 std::move(targets), ldb_nixpkgs_attr);
+        if (!r) {
+            std::cerr << util::format(r.error());
+            return 1;
+        }
+        std::cout << std::format("    Added manual recipe for {}\n", ldb_package);
+        return 0;
+    }
+
     return 0;
 }
 

src/codegen/cmake.cpp

@@ -111,7 +111,7 @@ auto emit_library(const layout::Target& lib, const std::string& package_name,
     out += std::format("add_library({} STATIC)\n", package_name);
     out += std::format("target_sources({}\n", package_name);
     out += "    PUBLIC\n";
-    out += "        FILE_SET CXX_MODULES FILES\n";
+    out += "        FILE_SET CXX_MODULES BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/.. FILES\n";
     for (const auto& m : lib.module_units) {
         out += std::format("            {}\n", rel_to_build(m, project_root));
     }

src/codegen/flake.cpp

@@ -59,25 +59,24 @@ auto find_lockfile_ref(const lockfile::Lockfile& lock, const std::string& name,
 
 auto build_bindings(const GenerateInputs& in) -> std::vector<DepBinding> {
     std::vector<DepBinding> out;
-    out.reserve(in.manifest.dependencies.size());
-    for (std::size_t i = 0; i < in.manifest.dependencies.size(); ++i) {
-        const auto& dep = in.manifest.dependencies[i];
-        const auto& rec = in.recipes[i];
+    out.reserve(in.manifest.dependencies.size() + in.manifest.dev_dependencies.size());
+    auto push = [&](const manifest::Dependency& dep, const linkdb::Recipe& rec) {
         auto ref = find_lockfile_ref(in.lock, dep.name, dep.version_spec);
-        // For pinned deps the lockfile's nixpkgs_attr is authoritative
-        // (it came from devbox's attr_paths for this specific rev). The
-        // curated recipe's attr only applies to nixos-unstable, so it's
-        // wrong when the dep pulls from a different rev.
         std::string attr = (ref.attr && !ref.attr->empty()) ? *ref.attr
                                                             : rec.nixpkgs_attr;
-        DepBinding b{
+        out.push_back(DepBinding{
             .name = dep.name,
             .version = dep.version_spec,
             .nixpkgs_attr = std::move(attr),
             .sanitized = sanitize_input_attr(dep.name, dep.version_spec),
             .rev = std::move(ref.rev),
-        };
-        out.push_back(std::move(b));
+        });
+    };
+    for (std::size_t i = 0; i < in.manifest.dependencies.size(); ++i) {
+        push(in.manifest.dependencies[i], in.recipes[i]);
+    }
+    for (std::size_t i = 0; i < in.manifest.dev_dependencies.size(); ++i) {
+        push(in.manifest.dev_dependencies[i], in.dev_recipes[i]);
     }
     return out;
 }