[Draft] Basic cli

CMakeLists.txt

@@ -88,7 +88,12 @@ if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.24)
             GIT_TAG ${JSON_FETCH_VERSION}
             FIND_PACKAGE_ARGS
             )
-    list(APPEND fetch_packages nlohmann_json)
+    FetchContent_Declare(CLI11
+            GIT_REPOSITORY https://github.com/CLIUtils/CLI11
+            GIT_TAG v2.3.2
+            FIND_PACKAGE_ARGS
+            )
+    list(APPEND fetch_packages nlohmann_json CLI11)
 else ()
     # Try to get system installed version
     find_package(nlohmann_json QUIET)
@@ -100,6 +105,15 @@ else ()
                 )
         list(APPEND fetch_packages nlohmann_json)
     endif ()
+    find_package(CLI11 QUIET)
+    if (NOT CLI11_FOUND)
+        # If failed fetch the desired version
+        FetchContent_Declare(CLI11
+                GIT_REPOSITORY https://github.com/CLIUtils/CLI11
+                GIT_TAG v2.3.2
+                )
+        list(APPEND fetch_packages nlohmann_json CLI11)
+    endif ()
 endif ()
 
 # Handle configure flags
@@ -140,6 +154,12 @@ set_target_properties(nlohmann_json_schema_validator PROPERTIES
         OUTPUT_NAME nlohmann_json_validator
         )
 
+add_executable(nlohmann_json_schema_validator_cli)
+set_target_properties(nlohmann_json_schema_validator_cli PROPERTIES
+        EXPORT_NAME cli
+        OUTPUT_NAME json-validator
+        )
+
 # Main definitions in here
 add_subdirectory(src)
 

src/CMakeLists.txt

@@ -6,13 +6,19 @@ target_sources(nlohmann_json_schema_validator PRIVATE
         json-patch.cpp
         string-format-check.cpp
         )
+target_sources(nlohmann_json_schema_validator_cli PRIVATE
+        cli.cpp)
+configure_file(nlohmann/json-schema.hpp.in nlohmann/json-schema.hpp)
+
 target_include_directories(nlohmann_json_schema_validator PUBLIC
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
         )
-
 set_target_properties(nlohmann_json_schema_validator PROPERTIES
-        PUBLIC_HEADER nlohmann/json-schema.hpp)
+        PUBLIC_HEADER ${CMAKE_CURRENT_BINARY_DIR}/nlohmann/json-schema.hpp)
+target_link_libraries(nlohmann_json_schema_validator_cli PRIVATE
+        nlohmann_json_schema_validator CLI11::CLI11)
 
 # TODO: Why would this need to be if guarded?
 if (JSON_VALIDATOR_SHARED_LIBS)

src/cli.cpp

@@ -0,0 +1,67 @@
+#include <CLI/App.hpp>
+#include <CLI/Config.hpp>
+#include <CLI/Formatter.hpp>
+#include <fstream>
+
+#include "nlohmann/json-schema.hpp"
+
+using namespace nlohmann;
+using namespace nlohmann::json_schema;
+
+class main_cli : public CLI::App
+{
+	std::string version;
+	std::ifstream schema_input;
+	std::filesystem::path object_path;
+	// TODO: Export this as a built-in loader
+	void loader(const json_uri &uri, json &sch)
+	{
+		std::string filename = object_path.parent_path().append(uri.path());
+		std::ifstream lf(filename);
+		if (!lf.good())
+			throw std::invalid_argument("could not open " + uri.url() + " tried with " + filename);
+		try {
+			lf >> sch;
+		} catch (const std::exception &e) {
+			throw e;
+		}
+	}
+
+public:
+	json schema;
+	json object;
+	json_validator validator;
+	main_cli()
+	    : CLI::App{"Json schema validator", "json-validator"},
+	      validator{
+	          [this](const json_uri &u, json &s) { this->loader(u, s); },
+	          default_string_format_check},
+	      version{nlohmann::json_schema::version}
+	{
+		set_version_flag("--version", version);
+		add_option("schema", schema_input, "JSON schema of the object")
+		    ->check(CLI::ExistingFile);
+		add_option("object", object_path, "JSON object to validate")
+		    ->check(CLI::ExistingFile);
+	}
+	void validate()
+	{
+		validator.set_root_schema(schema);
+		validator.validate(object);
+	}
+};
+
+int main(int argc, char *argv[])
+{
+	main_cli app{};
+
+	try {
+		app.parse(argc, argv);
+	} catch (const CLI::ParseError &e) {
+		return app.exit(e);
+	}
+
+	app.validate();
+
+	return 0;
+}

src/nlohmann/json-schema.hpp → src/nlohmann/json-schema.hpp.in

@@ -128,6 +128,8 @@ class JSON_SCHEMA_VALIDATOR_API json_uri
 namespace json_schema
 {
 
+constexpr std::string_view version = "@PROJECT_VERSION@";
+
 extern json draft7_schema_builtin;
 
 typedef std::function<void(const json_uri & /*id*/, json & /*value*/)> schema_loader;