From bc9502fbc36946f1d96d3f188e18346baddbf1d5 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 20 Aug 2022 22:44:21 +0200
Subject: Added stub of CLI utility for handling archives

This will eventually deprecate Datafile
---
 ArchiveEx/CMakeLists.txt |   8 +++
 ArchiveEx/dat.cpp        | 140 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 148 insertions(+)
 create mode 100644 ArchiveEx/dat.cpp

diff --git a/ArchiveEx/CMakeLists.txt b/ArchiveEx/CMakeLists.txt
index b2a1948..62e414e 100644
--- a/ArchiveEx/CMakeLists.txt
+++ b/ArchiveEx/CMakeLists.txt
@@ -11,3 +11,11 @@ target_link_libraries(
 	ArchiveEx
 	PRIVATE Zlib::zlib
 	)
+add_executable(
+	dat
+	dat.cpp
+	)
+target_link_libraries(
+	dat
+	PRIVATE ArchiveEx
+	)
diff --git a/ArchiveEx/dat.cpp b/ArchiveEx/dat.cpp
new file mode 100644
index 0000000..ae1304d
--- /dev/null
+++ b/ArchiveEx/dat.cpp
@@ -0,0 +1,140 @@
+#include <unistd.h>
+
+#include <exception>
+#include <iostream>
+#include <ostream>
+#include <string>
+#include <vector>
+
+#include <Archive.h>
+
+
+enum class Action
+{
+	NOTHING,
+	LIST,
+	UPDATE,
+	EXTRACT,
+};
+
+
+struct Options
+{
+	bool help {false};
+	Action action {Action::NOTHING};
+	bool create {false};
+	const char* archive {nullptr};
+	std::vector<std::string> files {};
+};
+
+
+class ArgsError : std::exception
+{
+public:
+	ArgsError(int opt, const char* msg) : option {opt}, message {msg} {}
+	int option;
+	const char* message;
+};
+
+
+static Options ParseArgs(int argc, char* argv[]);
+static void PrintUsage(std::ostream& out=std::cerr);
+static void PrintHelp(std::ostream& out=std::cout);
+
+
+static const char* program {"dat"};
+
+
+int
+main(int argc, char* argv[])
+try {
+	program = argv[0];
+	const auto opts = ParseArgs(argc, argv);
+	if (opts.help) {
+		PrintUsage(std::cout);
+		PrintHelp();
+		return 0;
+	}
+	ArchiveEx::Archive archive(opts.archive, opts.create);
+	switch (opts.action) {
+	case Action::NOTHING:
+		break;
+	case Action::LIST:
+		archive.PrintNamesOfEntries();
+		break;
+	case Action::UPDATE:
+		for (const auto& file : opts.files)
+			archive.Insert(file.c_str());  // Support recursive directories tar-like
+		break;
+	case Action::EXTRACT:
+		break;  // Not implemented
+	}
+}
+catch (const ArgsError& err) {
+	std::cerr << err.message;
+	if (err.option > 0)
+		std::cerr << ": " << static_cast<char>(err.option);
+	std::cerr << std::endl;
+	PrintUsage();
+	return 1;
+}
+catch (const char* err) {
+	std::cerr << err << std::endl;
+	return 1;
+}
+
+
+Options
+ParseArgs(int argc, char* argv[])
+{
+	int opt;
+	Options opts;
+	while (-1 != (opt = getopt(argc, argv, ":hluxc"))) {
+		switch (opt) {
+		case 'h':
+			opts.help = true;
+			return opts;  // No need to waste time as program won't do anything else anyway.
+		case 'l':
+			opts.action = Action::LIST;
+			break;
+		case 'u':
+			opts.action = Action::UPDATE;
+			break;
+		case 'x':
+			opts.action = Action::EXTRACT;
+			break;
+		case 'c':
+			opts.create = true;
+			break;
+		case ':':
+			throw ArgsError(optopt, "missing argument for option");
+		default:
+			throw ArgsError(optopt, "invalid option");
+		}
+	}
+	if (optind >= argc)
+		throw ArgsError(0, "missing archive name");
+	opts.archive = argv[optind++];
+	for (; optind < argc; ++optind)
+		opts.files.emplace_back(argv[optind]);
+	return opts;
+}
+
+
+void
+PrintUsage(std::ostream& out)
+{
+	out << "Usage: " << program << " [-hluxc] archive [file [files...]]" << std::endl;
+}
+
+
+void
+PrintHelp(std::ostream& out)
+{
+	out << "Options:" << std::endl;
+	out << "  -h\tPrints this help message and exits." << std::endl;
+	out << "  -l\tLists files in the archive." << std::endl;
+	out << "  -u\tInserts files from file system into archive." << std::endl;
+	out << "  -x\tExtracts files from the archive." << std::endl;
+	out << "  -c\tCreate the archive if it does not exist." << std::endl;
+}
-- 
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