From 940e1b410343f423a9bc41ca8da0c3859e2333fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Christian=20Gl=C3=B6ckner?= <cgloeckner@freenet.de>
Date: Tue, 29 Mar 2016 08:30:06 +0200
Subject: Initial implementation

---
 .gitignore   | 29 +-----------------
 example.cpp  | 35 ++++++++++++++++++++++
 getoptpp.hpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 132 insertions(+), 28 deletions(-)
 create mode 100644 example.cpp
 create mode 100644 getoptpp.hpp

diff --git a/.gitignore b/.gitignore
index b8bd026..bc98fd3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,28 +1 @@
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
+getoptpp.geany
diff --git a/example.cpp b/example.cpp
new file mode 100644
index 0000000..c99f3e7
--- /dev/null
+++ b/example.cpp
@@ -0,0 +1,35 @@
+#include <iostream>
+
+#include "getoptpp.hpp"
+
+int main(int argc, char* argv[]) {
+	int verbose_flag;
+	
+	gopt::Options opt;
+	opt.add("verbose", no_argument, &verbose_flag, 1, [&]() {
+		std::cout << "verbose: " << verbose_flag << "\n";
+	});
+	opt.add("brief", no_argument, &verbose_flag, 0, [&]() {
+		std::cout << "brief: " << verbose_flag << "\n";
+	});
+	opt.add("add", no_argument, 'a', [&]() {
+		std::cout << "add\n";
+	});
+	opt.add("append", no_argument, 'b', [&]() {
+		std::cout << "append\n";
+	});
+	opt.add("delete", required_argument, 'd', [&]() {
+		std::cout << "delete: " << optarg << "\n";
+	});
+	opt.add("create", required_argument, 'c', [&]() {
+		std::cout << "create: " << optarg << "\n";
+	});
+	opt.add("file", required_argument, 'f', [&]() {
+		std::cout << "file: " << optarg << "\n";
+	});
+	opt.add("help", no_argument, '?', [&]() {
+		std::cout << "usage stuff\n";
+	});
+	
+	opt.process(argc, argv);
+}
diff --git a/getoptpp.hpp b/getoptpp.hpp
new file mode 100644
index 0000000..4fe3c3a
--- /dev/null
+++ b/getoptpp.hpp
@@ -0,0 +1,96 @@
+#pragma once
+#include <cassert>
+#include <functional>
+#include <vector>
+#include <unordered_map>
+#include <getopt.h>
+
+namespace gopt {
+
+using Handle = std::function<void()>;
+
+class Options {
+	public:
+		Options();
+		
+		void add(std::string const & name, int has_arg, int val, Handle handle);
+		void add(std::string const & name, int has_arg, int* flag, int val, Handle handle);
+		
+		void process(int argc, char* argv[]);
+		
+	private:
+		std::size_t num_flags;
+		std::vector<option> options;
+		std::unordered_map<int, Handle> handles;
+};
+
+Options::Options()
+	: num_flags{}
+	, options{}
+	, handles{} {
+}
+
+void Options::add(std::string const & name, int has_arg, int val, Handle handle) {
+	add(name, has_arg, nullptr, val, handle);
+}
+
+void Options::add(std::string const & name, int has_arg, int* flag, int val, Handle handle) {
+	options.emplace_back();
+	auto& option = options.back();
+	option.name = name.c_str();
+	option.has_arg = has_arg;
+	option.flag = flag;
+	option.val = val;
+	
+	int index = val;
+	if (flag != nullptr) {
+		index = num_flags++;
+	}
+	handles[index] = handle;
+}
+
+void Options::process(int argc, char* argv[]) {
+	std::string shortopts;
+	for (auto const & option: options) {
+		if (option.flag != nullptr) {
+			continue;
+		}
+		shortopts += static_cast<char>(option.val);
+		
+		switch (option.has_arg) {
+			case no_argument:
+				break;
+			case required_argument:
+				shortopts += ":";
+				break;
+			case optional_argument:
+				shortopts += "::";
+				break;
+		}
+	}
+	
+	// add termination option
+	options.push_back({0, 0, 0, 0});
+	
+	// handle arguments
+	while (true) {
+		int index{0};
+		int key = getopt_long(argc, argv, shortopts.c_str(), options.data(), &index);
+		
+		if (key == -1) {
+			break;
+		} else if (key == 0) {
+			// call flag's handle
+			handles.at(index)();
+		} else {
+			// call option's handle
+			handles.at(key)();
+		}
+	}
+	
+	// remove terminating option
+	options.pop_back();
+	assert(options.size() == handles.size());
+}
+
+}
-- 
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