diff --git a/src/main.cpp b/src/main.cpp
index 0075f34..5d51a6f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -14,18 +14,20 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <experimental/filesystem>
-#include <iostream>
-#include <string>
-#include <fstream>
-#include <chrono>
-#include <system_error>
-#include <cstdlib>
-#include <unistd.h>
+#include "version.hpp"
+#include "xdgcfg.hpp"
 #include <libconfig.h++>
 #include <basedir.h>
-#include "xdgcfg.hpp"
-#include "version.hpp"
+#include <unistd.h>
+#include <chrono>
+#include <cstdlib>
+#include <exception>
+#include <experimental/filesystem>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <system_error>
+#include <vector>
 
 namespace fs = std::experimental::filesystem;
 using std::cout;
@@ -34,12 +36,32 @@ using std::endl;
 using std::chrono::system_clock;
 using std::chrono::hours;
 using std::chrono::duration_cast;
+using std::string;
+using std::vector;
 
-string compiler = "g++ -x c++";
-fs::path cache_dir;
-int clean_after_hours = 30 * 24;
+class Compilescript
+{
+private:
+    string _compiler;
+    fs::path _cache_dir;
+    int _clean_after_hours;
 
-bool read_settings()
+public:
+    Compilescript();
+
+    void read_settings();
+    void cleanup();
+    bool compile(const string &filename, char *argv[]);
+    void print_version();
+};
+
+Compilescript::Compilescript()
+    : _compiler("g++ -x c++")
+    , _clean_after_hours(30 * 24)
+{}
+
+
+void Compilescript::read_settings()
 {
     bool need_save = false;
     xdgcfg config("compilescript.cfg");
@@ -48,106 +70,79 @@ bool read_settings()
 
     if (cfg.exists("compiler"))
     {
-        compiler = cfg["compiler"].c_str();
+        _compiler = cfg["compiler"].c_str();
     }
     else
     {
-        cfg.add("compiler", libconfig::Setting::TypeString) = compiler;
+        cfg.add("compiler", libconfig::Setting::TypeString) = _compiler;
         need_save = true;
     }
 
     if (cfg.exists("clean_after_hours"))
     {
-        cfg.lookupValue("clean_after_hours", clean_after_hours);
+        cfg.lookupValue("clean_after_hours", _clean_after_hours);
     }
     else
     {
         cfg.add("clean_after_hours",
-                libconfig::Setting::TypeInt) = clean_after_hours;
+                libconfig::Setting::TypeInt) = _clean_after_hours;
         need_save = true;
     }
 
     if (cfg.exists("cache_dir"))
     {
-        cache_dir = cfg["cache_dir"].c_str();
+        _cache_dir = cfg["cache_dir"].c_str();
     }
     else
     {
         xdgHandle xdg;
         xdgInitHandle(&xdg);
-        cache_dir = xdgCacheHome(&xdg);
-        cache_dir /= "compilescript";
+        _cache_dir = xdgCacheHome(&xdg);
+        _cache_dir /= "compilescript";
         xdgWipeHandle(&xdg);
     }
-    if (!fs::is_directory(cache_dir))
+    if (!fs::is_directory(_cache_dir))
     {
-        fs::create_directories(cache_dir);
+        fs::create_directories(_cache_dir);
     }
 
     if (need_save)
     {
         config.write();
     }
-
-    return true;
 }
 
-void cleanup()
+void Compilescript::cleanup()
 {
-    for (const fs::directory_entry &entry
-         : fs::recursive_directory_iterator(cache_dir))
+    for (const auto &entry : fs::recursive_directory_iterator(_cache_dir))
     {
-        if (fs::is_regular_file(entry))
+        if (!fs::is_regular_file(entry))
         {
-            auto diff = system_clock::now() - fs::last_write_time(entry);
-            if (duration_cast<hours>(diff).count() > clean_after_hours)
-            {
-                fs::path current_path = entry.path();
-                std::error_code e;
+            continue;
+        }
 
-                while (fs::remove(current_path, e))
+        const auto diff = system_clock::now() - fs::last_write_time(entry);
+        if (duration_cast<hours>(diff).count() > _clean_after_hours)
+        {
+            fs::path current_path = entry.path();
+            std::error_code e;
+
+            while (fs::remove(current_path, e))
+            {
+                current_path = current_path.parent_path();
+                if (current_path == _cache_dir)
                 {
-                    current_path = current_path.parent_path();
-                    if (current_path == cache_dir)
-                    {
-                        break;
-                    }
+                    break;
                 }
             }
         }
     }
 }
 
-int main(int argc, char *argv[])
+bool Compilescript::compile(const string &filename, char *argv[])
 {
-    if (!read_settings())
-    {
-        return 1;
-    }
-
-    if (argc <= 1)
-    {
-        cerr << "usage: " << argv[0] <<
-            " [file|--cleanup|--version] [arguments]\n";
-        return 1;
-    }
-    if (string(argv[1]) == "--cleanup")
-    {
-        cleanup();
-        return 0;
-    }
-    if (string(argv[1]) == "--version")
-    {
-        cout << "compilescript " << global::version << endl <<
-            "Copyright (C) 2018, 2019 tastytea <tastytea@tastytea.de>\n"
-            "License GPLv3: GNU GPL version 3 <https://www.gnu.org/licenses/gpl-3.0.html>.\n"
-            "This program comes with ABSOLUTELY NO WARRANTY. This is free software,\n"
-            "and you are welcome to redistribute it under certain conditions.\n";
-        return 0;
-    }
-
-    const fs::path original = fs::canonical(argv[1]);
-    const fs::path source = cache_dir / original;
+    const fs::path original = fs::canonical(filename);
+    const fs::path source = _cache_dir / original;
     const fs::path binary = (source.string() + ".bin");
     string compiler_arguments;
     fs::create_directories(binary.parent_path());
@@ -170,7 +165,11 @@ int main(int argc, char *argv[])
                 }
 
                 std::getline(in, buf);
-                if (buf.substr(0, 16) == "//compilescript:")
+                if (buf.substr(0, 17) == "// compilescript:")
+                {
+                    compiler_arguments = buf.substr(17);
+                }
+                else if (buf.substr(0, 16) == "//compilescript:")
                 {
                     compiler_arguments = buf.substr(16);
                 }
@@ -196,26 +195,73 @@ int main(int argc, char *argv[])
             else
             {
                 cerr << "ERROR: Could not open file: " << source << endl;
-                return 1;
+                return false;
             }
         }
         else
         {
             cerr << "ERROR: Could not open file: " << original << endl;
-            return 1;
+            return false;
         }
 
-        int ret = std::system((compiler + " " + source.string() + " " +
-                               compiler_arguments +
-                               " -o " + binary.string()).c_str());
+        const string command = _compiler + " " + source.string() + " "
+            + compiler_arguments + " -o " + binary.string();
+        int ret = std::system(command.c_str()); // NOLINT Doesn't apply here.
         if (ret != 0)
         {
             cerr << "ERROR: Compilation failed.\n";
-            return 1;
+            return false;
         }
     }
 
-    execv(binary.c_str(), &argv[1]);
+    execvp(binary.c_str(), &argv[1]); // NOLINT We know that argv[1] exists.
+
+    return true;
+}
+
+void Compilescript::print_version()
+{
+    cout << "compilescript " << global::version << '\n' <<
+        "Copyright (C) 2018, 2019 tastytea <tastytea@tastytea.de>\n"
+        "License GPLv3: GNU GPL version 3 "
+        "<https://www.gnu.org/licenses/gpl-3.0.html>.\n"
+        "This program comes with ABSOLUTELY NO WARRANTY. This is free software,"
+        "\nand you are welcome to redistribute it under certain conditions.\n";
+}
+
+int main(int argc, char *argv[])
+{
+    const vector<string> args(argv, argv + argc);
+
+    Compilescript App;
+    App.read_settings();
+
+    if (args.size() <= 1)
+    {
+        cerr << "usage: " << args[0]
+             << " [file|--cleanup|--version] [arguments]\n";
+        return 1;
+    }
+    if (args[1] == "--cleanup")
+    {
+        App.cleanup();
+        return 0;
+    }
+    if (args[1] == "--version")
+    {
+        App.print_version();
+        return 0;
+    }
+
+    try
+    {
+        App.compile(args[1], argv);
+    }
+    catch (const std::exception &e)
+    {
+        cerr << "Error: " << e.what() << endl;
+        return 1;
+    }
 
     return 0;
 }
diff --git a/src/version.hpp.in b/src/version.hpp.in
index cec7915..c1b66ee 100644
--- a/src/version.hpp.in
+++ b/src/version.hpp.in
@@ -3,7 +3,7 @@
 
 namespace global
 {
-    static constexpr char version[] = "@PROJECT_VERSION@";
+static constexpr char version[] = "@PROJECT_VERSION@";
 }
 
 #endif // VERSION_HPP