Parse command line with boost program_options

cli/CMakeLists.txt

@@ -2,32 +2,22 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
-FetchContent_Declare(ftxui
-	GIT_REPOSITORY https://github.com/ArthurSonzogni/ftxui
-	GIT_TAG v6.1.9
-	GIT_PROGRESS TRUE
-	GIT_SHALLOW TRUE
-	EXCLUDE_FROM_ALL
-)
 FetchContent_Declare(toml11
 	GIT_REPOSITORY https://github.com/ToruNiina/toml11.git
 	GIT_TAG v4.4.0
 	GIT_PROGRESS TRUE
 )
-FetchContent_MakeAvailable(ftxui toml11)
+FetchContent_MakeAvailable(toml11)
 
 find_package(Boost CONFIG COMPONENTS program_options REQUIRED)
 
 add_executable(katja-cli main.cpp)
 target_sources(katja-cli PUBLIC FILE_SET all_my_modules TYPE CXX_MODULES FILES
-	component.cpp configuration.cpp
+	command_line.cpp configuration.cpp
 )
 target_include_directories(katja-cli PRIVATE ${Boost_INCLUDE_DIR})
 target_link_libraries(katja-cli
 	PUBLIC katja
-	PRIVATE ftxui::screen
-	PRIVATE ftxui::dom
-	PRIVATE ftxui::component
 	PRIVATE toml11::toml11
 	PRIVATE Boost::program_options
 )

cli/command_line.cpp

@@ -0,0 +1,73 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+module;
+
+#include <variant>
+#include <string>
+#include <stdexcept>
+#include <algorithm>
+#include <cstring>
+
+#include <boost/program_options.hpp>
+
+export module katja.command_line;
+
+namespace katja
+{
+    export enum class command
+    {
+        updates,
+        search,
+        help
+    };
+
+    export struct command_line
+    {
+        const command type;
+        const std::vector<std::string> arguments;
+    };
+
+    export class invalid_command_error : public std::runtime_error
+    {
+        const std::string command;
+
+    public:
+        invalid_command_error()
+            : std::runtime_error("Expecting the command line to begin with a command.")
+        {
+        }
+
+        invalid_command_error(const std::string& invalid_command)
+            : command{ invalid_command },
+            std::runtime_error("Unknown command given on the command line.")
+        {
+        }
+    };
+
+    export command_line parse_command_line(int argc, const char **argv)
+    {
+        if (argc == 1)
+        {
+            throw invalid_command_error();
+        }
+        std::vector<std::string> arguments;
+        std::copy(argv + 2, argv + argc, std::back_inserter(arguments));
+
+        if (strcmp("updates", argv[1]) == 0)
+        {
+            return command_line{ command::updates, std::move(arguments) };
+        }
+        if (strcmp("search", argv[1]) == 0)
+        {
+            return command_line{ command::search, std::move(arguments) };
+        }
+        if (strcmp("help", argv[1]) == 0)
+        {
+            return command_line{ command::help, std::move(arguments) };
+        }
+        throw invalid_command_error(argv[1]);
+    }
+}

cli/component.cpp

@@ -1,89 +0,0 @@
-/*
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at https://mozilla.org/MPL/2.0/.
- */
-module;
-
-#include <optional>
-#include <sstream>
-
-#include <ftxui/component/event.hpp>
-#include <ftxui/component/component.hpp>
-#include <ftxui/dom/elements.hpp>
-
-import katja.repository;
-
-export module katja.component;
-
-export namespace katja
-{
-    class PackageListBase : public ftxui::ComponentBase
-    {
-        std::string title;
-        const std::vector<package_identifier> packages;
-        std::optional<std::size_t> selected;
-
-    public:
-        PackageListBase(const std::string& title, const std::vector<package_identifier>& packages = {})
-            : title(title), packages(packages)
-        {
-        }
-
-        ftxui::Element OnRender() override
-        {
-            std::vector<ftxui::Element> lines;
-
-            for (const auto& package_identifier : this->packages)
-            {
-                auto line = ftxui::text(package_identifier.to_string()) | color(ftxui::Color::SkyBlue2);
-                lines.push_back(line);
-            }
-            if (this->selected.has_value() && this->selected.value() < lines.size())
-            {
-                lines[this->selected.value()] |= ftxui::focus;
-            }
-            std::stringstream summary;
-
-            summary << title << '(' << packages.size() << ')';
-
-            return ftxui::window(ftxui::text(summary.str()), ftxui::vbox(lines) | ftxui::yframe);
-        }
-
-        bool OnEvent(ftxui::Event event) override
-        {
-            if (event == ftxui::Event::ArrowDown)
-            {
-                if (!this->selected.has_value() && !this->packages.empty())
-                {
-                    this->selected = std::make_optional<std::size_t>(0);
-                }
-                else if (this->selected.has_value() && this->selected.value() + 1 < this->packages.size())
-                {
-                    this->selected = std::make_optional<std::size_t>(this->selected.value() + 1);
-                }
-                return true;
-            }
-            else if (event == ftxui::Event::ArrowUp)
-            {
-                if (!this->selected.has_value() && !this->packages.empty())
-                {
-                    this->selected = std::make_optional<std::size_t>(0);
-                }
-                else if (this->selected.has_value()
-                        && this->selected.value() < this->packages.size()
-                        && this->selected.value() > 0)
-                {
-                    this->selected = std::make_optional<std::size_t>(this->selected.value() - 1);
-                }
-                return true;
-            }
-            return false;
-        }
-    };
-
-    ftxui::Component PackageList(const std::string& title, const std::vector<package_identifier>& packages = {})
-    {
-        return ftxui::Make<PackageListBase>(title, packages);
-    }
-}

cli/configuration.cpp

@@ -7,6 +7,7 @@ module;
 
 #include <string>
 #include <forward_list>
+#include <stdexcept>
 
 #include <toml.hpp>
 
@@ -15,8 +16,6 @@ import katja.repository;
 
 export module katja.configuration;
 
-import katja.component;
-
 export namespace katja
 {
     struct repository_configuration
@@ -58,17 +57,30 @@ export namespace katja
             return this->repositories.cend();
         }
     };
+
+    class configuration_error : public std::runtime_error
+    {
+    public:
+        configuration_error()
+            : std::runtime_error("Configuration is expected to be a table of repositories.")
+        {
+        }
+    };
 }
 
 TOML11_DEFINE_CONVERSION_NON_INTRUSIVE(katja::repository_configuration, path);
 
 export namespace katja
 {
-    configuration read_configuration()
+    configuration read_configuration(const std::string& configuration_file)
     {
-        auto raw_root = toml::parse("katja.toml");
+        auto raw_root = toml::parse(configuration_file);
         configuration result;
 
+        if (!raw_root.is_table())
+        {
+            throw configuration_error();
+        }
         for (const auto& [root_name, root_value] : raw_root.as_table())
         {
             auto repository_value = toml::get<repository_configuration>(root_value);

cli/main.cpp

@@ -3,18 +3,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
-module;
-
 #include <filesystem>
 #include <memory>
 #include <iostream>
 
-#include <toml.hpp>
+#include <boost/program_options.hpp>
 
 import katja.database;
 import katja.repository;
 import katja.sbo;
 import katja.configuration;
+import katja.command_line;
 
 static void get_updates(std::shared_ptr<katja::repository> repository, katja::package_database&& installed_database)
 {
@@ -39,14 +38,11 @@ static void search_names(std::shared_ptr<katja::repository> repository, const st
 
 int main(int argc, const char **argv)
 {
-    katja::configuration configuration = katja::read_configuration();
+    katja::configuration configuration = katja::read_configuration("katja.toml");
     katja::package_database installed_database = katja::read_installed_database();
 
-    if (argc == 1)
-    {
-        return EXIT_FAILURE;
-    }
-    if (strcmp("updates", argv[1]) == 0)
+    katja::command_line command_line = katja::parse_command_line(argc, argv);
+    if (command_line.type == katja::command::updates)
     {
         for (const auto& [repository_name, repository_configuration] : configuration)
         {
@@ -56,14 +52,32 @@ int main(int argc, const char **argv)
             get_updates(repository, std::move(installed_database));
         }
     }
-    else if (strcmp("search", argv[1]) == 0 && argc == 3)
+    else if (command_line.type == katja::command::search)
     {
+        boost::program_options::options_description search_description("Search packages");
+        search_description
+            .add_options()("name", "Find packages by name");
+
+        boost::program_options::positional_options_description positional_arguments;
+        positional_arguments.add("name", 1);
+
+        boost::program_options::variables_map option_map;
+        auto command_parser = boost::program_options::command_line_parser(command_line.arguments)
+            .options(search_description).positional(positional_arguments);
+        boost::program_options::store(command_parser.run(), option_map);
+        boost::program_options::notify(option_map);
+
+        if (!option_map.count("name"))
+        {
+            std::cerr << search_description;
+            return EXIT_FAILURE;
+        }
         for (const auto& [repository_name, repository_configuration] : configuration)
         {
             std::filesystem::path slackbuild_repository{ repository_configuration.path };
             auto repository = std::make_shared<katja::sbo_repository>(slackbuild_repository);
 
-            search_names(repository, std::string(argv[2]));
+            search_names(repository, option_map["name"].as<std::string>());
         }
     }