From 22f4c334b7916e2c452e8b800106a50cd1617f84 Mon Sep 17 00:00:00 2001
From: Stefano Sanfilippo <a.little.coder@gmail.com>
Date: Tue, 10 Mar 2015 14:36:32 +0100
Subject: [PATCH] Adding command line options parser

---
 src/CLineParser.cpp | 77 +++++++++++++++++++++++++++++++++++++++++++++
 src/CLineParser.hpp | 43 +++++++++++++++++++++++++
 src/CMakeLists.txt  |  4 +--
 src/main.cpp        |  8 +++--
 4 files changed, 128 insertions(+), 4 deletions(-)
 create mode 100644 src/CLineParser.cpp
 create mode 100644 src/CLineParser.hpp

diff --git a/src/CLineParser.cpp b/src/CLineParser.cpp
new file mode 100644
index 0000000..a7afaba
--- /dev/null
+++ b/src/CLineParser.cpp
@@ -0,0 +1,77 @@
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "CLineParser.hpp"
+
+#include <boost/program_options.hpp>
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+namespace po = boost::program_options;
+using namespace monicelli;
+
+static po::variables_map CONFIG;
+static const std::string VERSION_STRING = 
+    "mcc, Monicelli compiler <https://github.com/esseks/monicelli>\n"
+    "\n"
+    "Copyright © 2014,2015 Stefano Sanfilippo\n"
+    "\n"
+    "This program comes with ABSOLUTELY NO WARRANTY;\n"
+    "This is free software, and you are welcome to redistribute it\n"
+    "under certain conditions; See LICENSE.txt for all details"
+;
+
+po::variables_map const& monicelli::getConfig() {
+    return CONFIG;
+}
+
+void monicelli::parseCommandLine(int argc, char **argv) {
+    po::options_description desc(
+        std::string("Usage: ") + argv[0] + " [options] file.mc ..."
+    );
+    desc.add_options()
+        ("help,h", "display this help message")
+        ("version,v", "display version")
+        ("input,i", po::value<std::vector<std::string>>(), "input files to process")
+    ;
+
+    po::positional_options_description positional;
+    positional.add("input", -1);
+
+    po::store(
+        po::command_line_parser(argc, argv)
+            .options(desc)
+            .positional(positional)
+            .run(),
+        CONFIG
+    );
+
+    po::notify(CONFIG);
+
+    if (configHas("help")) {
+        std::cout << desc;
+        exit(0);
+    }
+
+    if (configHas("version")) {
+        std::cout << VERSION_STRING << std::endl;
+        exit(0);
+    }
+}
diff --git a/src/CLineParser.hpp b/src/CLineParser.hpp
new file mode 100644
index 0000000..46dae91
--- /dev/null
+++ b/src/CLineParser.hpp
@@ -0,0 +1,43 @@
+#ifndef CLINE_PARSER_HPP
+#define CLINE_PARSER_HPP
+
+/*
+ * Monicelli: an esoteric language compiler
+ * 
+ * Copyright (C) 2014 Stefano Sanfilippo
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <boost/program_options.hpp>
+
+namespace monicelli {
+
+boost::program_options::variables_map const& getConfig();
+
+void parseCommandLine(int argc, char **argv);
+
+template<typename T> inline
+T config(std::string const& name) {
+    return getConfig()[name].as<T>();
+}
+
+static inline
+bool configHas(std::string const& name) {
+    return getConfig().count(name);
+}
+
+}
+
+#endif
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ad0d297..76ea90e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -30,7 +30,7 @@ endif()
 
 ## 2. External components
 
-find_package(Boost 1.48 REQUIRED regex system filesystem)
+find_package(Boost 1.48 REQUIRED regex system filesystem program_options)
 find_package(LLVM REQUIRED CONFIG)
 
 find_library(YAML_LIBRARIES yaml-cpp)
@@ -59,7 +59,7 @@ flex_target(Scanner Monicelli.lpp ${CMAKE_CURRENT_BINARY_DIR}/Lexer.cpp)
 add_flex_bison_dependency(Scanner Parser)
 
 add_executable(mcc
-    main.cpp Nodes.cpp
+    main.cpp Nodes.cpp CLineParser.cpp
     ModuleRegistry.cpp ModuleLoader.cpp
     ${BISON_Parser_OUTPUTS} ${FLEX_Scanner_OUTPUTS}
     CppEmitter.cpp BitcodeEmitter.cpp
diff --git a/src/main.cpp b/src/main.cpp
index d5e5e0d..907d697 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -23,6 +23,7 @@
 #include "ModuleRegistry.hpp"
 #include "ModuleLoader.hpp"
 #include "BitcodeEmitter.hpp"
+#include "CLineParser.hpp"
 
 #include <llvm/Bitcode/ReaderWriter.h>
 #include <llvm/Support/FileSystem.h>
@@ -40,6 +41,10 @@ using namespace monicelli;
 
 
 int main(int argc, char **argv) {
+    parseCommandLine(argc, argv);
+
+    if (!configHas("input")) return 0;
+
     registerStdLib(getModuleRegistry());
 
     boost::regex namere("^(.+)\\.mc$");
@@ -48,8 +53,7 @@ int main(int argc, char **argv) {
     std::vector<std::string> sources;
     std::vector<std::string> modules;
 
-    for (int i = 1; i < argc; ++i) {
-        std::string arg(argv[i]);
+    for (std::string const& arg: config<std::vector<std::string>>("input")) {
         if (boost::regex_match(arg, namere)) {
             sources.push_back(arg);
         } else if (boost::regex_match(arg, modulere)) {