Add command to clone the source repository

build.ninja

@@ -3,11 +3,11 @@ rule cxx
   description = CXX $out
 
 rule link
-  command = g++ -o $out $in
+  command = g++ -o $out $in -lboost_filesystem -lboost_system
   description = LINK $out
 
 build build/package.o: cxx src/package.cpp | src/package.h
-build build/command.o: cxx src/command.cpp | src/command.h build/package.o
+build build/command.o: cxx src/command.cpp | src/command.h build/package.o src/config.h
 
 build build/main.o: cxx src/main.cpp
 

src/command.cpp

@@ -1,5 +1,6 @@
 #include "command.h"
 #include <cassert>
+#include "config.h"
 
 namespace katja
 {
@@ -17,7 +18,33 @@ namespace katja
     void help::execute() const
     {
         std::cout << "Usage:\n"
-            "\tkatja {info|help} [OPTIONS]\n\n";
+            "\tkatja {list|update|help} [OPTIONS]\n\n";
+    }
+
+    update::update()
+        : git_binary(boost::process::search_path("git"))
+    {
+    }
+
+    void update::execute() const
+    {
+        std::filesystem::path workdir{ WORKDIR };
+        std::filesystem::path repository = workdir / "sbo/repository";
+        std::filesystem::file_status repository_status = std::filesystem::status(repository);
+
+        if (std::filesystem::exists(repository_status)
+            && !std::filesystem::is_directory(repository_status))
+        {
+            throw std::runtime_error("The working directory path \""
+                + repository.string() + "\" exists, but it isn't a directory.");
+        }
+        else if (!std::filesystem::exists(repository_status))
+        {
+            git("clone", std::filesystem::path(),
+                "git://git.slackbuilds.org/slackbuilds.git", repository.native());
+        }
+        git("remote", repository.native(), "update", "--prune");
+        git("reset", repository.native(), "--hard", "origin/master");
     }
 
     command_exception::command_exception(const command_exception_t exception_type,
@@ -65,6 +92,10 @@ namespace katja
         {
             return std::make_unique<list>();
         }
+        else if (strcmp(argv[1], "update") == 0)
+        {
+            return std::make_unique<update>();
+        }
         else if (strcmp(argv[1], "help") == 0)
         {
             return std::make_unique<help>();

src/command.h

@@ -3,6 +3,8 @@
 #include <memory>
 #include <vector>
 #include "package.h"
+#include <boost/process.hpp>
+#include <filesystem>
 
 namespace katja
 {
@@ -24,6 +26,29 @@ namespace katja
         void execute() const override;
     };
 
+    class update final : public command
+    {
+        boost::filesystem::path git_binary;
+
+        template<typename... Args>
+        void git(const std::string& command, const std::filesystem::path& cwd, const Args&... args) const
+        {
+            if (cwd.empty())
+            {
+                boost::process::system(git_binary, command, args...);
+            }
+            else
+            {
+                boost::process::system(git_binary, "-C", cwd.native(), command, args...);
+            }
+        }
+
+    public:
+        explicit update();
+
+        void execute() const override;
+    };
+
     enum class command_exception_t
     {
         no_command,

src/config.h

@@ -0,0 +1 @@
+#define WORKDIR "./var"