Add an utility to list all installed packages

1 files changed, 48 insertions, 0 deletions

diff --git a/src/command.h b/src/command.h
new file mode 100644
index 0000000..8d0679d
--- /dev/null
+++ b/src/command.h
@@ -0,0 +1,48 @@
+#include <iostream>
+#include <cstring>
+#include <memory>
+#include <vector>
+#include "package.h"
+
+namespace katja
+{
+    class command
+    {
+    public:
+        virtual void execute() const = 0;
+    };
+
+    class list final : public command
+    {
+    public:
+        void execute() const override;
+    };
+
+    class help final : public command
+    {
+    public:
+        void execute() const override;
+    };
+
+    enum class command_exception_t
+    {
+        no_command,
+        too_many_arguments,
+        unknown_command,
+    };
+
+    class command_exception final : public std::exception
+    {
+        command_exception_t m_exception_type;
+        std::vector<std::string> m_failed_arguments;
+
+    public:
+        explicit command_exception(const command_exception_t exception_type,
+            std::vector<std::string> failed_arguments = {}) noexcept;
+
+        const char *what() const noexcept override;
+        const std::vector<std::string>& failed_arguments() const noexcept;
+    };
+
+    std::unique_ptr<command> parse_command_line(int argc, char **argv);
+}