From 7c4acf3241acf683408a34f63fd52f6d6f8a58df Mon Sep 17 00:00:00 2001
From: Kelvin Sherlock <ksherlock@gmail.com>
Date: Wed, 3 Aug 2016 20:10:22 -0400
Subject: [PATCH] dot_clean, like the OS X utility.

---
 dot_clean.cpp | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 196 insertions(+)
 create mode 100644 dot_clean.cpp

diff --git a/dot_clean.cpp b/dot_clean.cpp
new file mode 100644
index 0000000..1c4ccf8
--- /dev/null
+++ b/dot_clean.cpp
@@ -0,0 +1,196 @@
+
+
+#include <string>
+#include <vector>
+#include <stdexcept>
+#include <algorithm>
+#include <functional>
+#include <system_error>
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdlib.h>
+
+#include <sys/types.h>
+#include <dirent.h>
+
+#include <arpa/inet.h>
+
+#include <sysexits.h>
+
+#include "applefile.h"
+#include "mapped_file.h"
+
+
+std::vector<std::string> unlink_list;
+std::vector<std::string> rmdir_list;
+
+
+bool _f = false;
+bool _m = false;
+bool _n = false;
+bool _p = false;
+bool _s = false;
+bool _v = false;
+
+int _rv = 0;
+
+
+
+
+void throw_damaged_file() {
+	throw std::runtime_error("File is damaged.");
+}
+
+void throw_eof() {
+	throw std::runtime_error("Unexpected end of file.");
+}
+
+
+void throw_errno() {
+	throw std::system_error(errno, std::system_category());
+}
+
+
+void throw_errno(const std::string &what) {
+	throw std::system_error(errno, std::system_category(), what);
+}
+
+
+class defer {
+public:
+	typedef std::function<void()> FX;
+	defer() = default;
+
+	defer(FX fx) : _fx(fx) {}
+	defer(const defer &) = delete;
+	defer(defer &&) = default;
+	defer & operator=(const defer &) = delete;
+	defer & operator=(defer &&) = default;
+
+	void cancel() { _fx = nullptr;  }
+	~defer() { if (_fx) _fx(); }
+private:
+	FX _fx;
+};
+
+
+
+void one_file(const std::string &data, const std::string &rsrc) noexcept try {
+
+	if (_v) fprintf(stdout, "%s\n", data.c_str());
+
+	int fd = open(data.c_str(), O_RDONLY);
+	if (fd < 0) {
+
+		if (errno == ENOENT && _n) { unlink_list.push_back(rsrc); return; }
+		throw_errno();
+	}
+
+	defer close_fd([fd]{close(fd); });
+
+	mapped_file mf(rsrc, mapped_file::priv);
+
+
+	if (!_p) unlink_list.push_back(rsrc);
+
+} catch (std::exception &ex) {
+	_rv = 1;
+	fprintf(stderr, "%s : %s\n", data.c_str(), ex.what());
+}
+
+void one_dir(std::string dir) noexcept {
+
+	DIR *dirp;
+	dirent *dp;
+
+	// check for .AppleDouble folder.
+
+
+	if (dir.empty()) return;
+
+	while (!dir.empty() && dir.back() == '/') dir.pop_back();
+	dir.push_back('/');
+
+	std::string ad = dir + ".AppleDouble/";
+
+	dirp = opendir(ad.c_str());
+	if (dirp) {
+		while ( (dp = readdir(dirp)) ) {
+
+			if (dp->d_name[0] == '.') continue;
+
+			std::string name = dp->d_name;
+
+			one_file(dir + name, ad + name);
+		}
+		if (!_p) rmdir_list.push_back(ad); // delete it if empty.
+		closedir(dirp);
+	}
+
+
+	dirp = opendir(dir.c_str());
+
+	while ( (dp = readdir(dirp)) ) {
+		if (dp->d_name[0] != '.') continue;
+		if (dp->d_name[1] != '_') continue;
+
+		std::string name = dp->d_name;
+		one_file(dir + name.substr(2), dir + name);
+	}
+	closedir(dirp);
+
+}
+
+void usage() {
+	fputs("Usage: dot_clean [-fhmnpsv] directory ...\n", stderr);
+	exit(EX_USAGE);
+}
+
+void help() {
+	fputs(
+		"Usage: dot_clean [-fhmnpsv] directory ...\n"
+		"\n"
+		"    -f Disable recursion\n"
+		"    -h Display help\n"
+		"    -m Always delete apple double files\n"
+		"    -n Deleted apple double files if there is no matching native file\n"
+		"    -p Preserve apple double file.\n"
+		"    -s Follow symbolic links.\n"
+		"    -v Be verbose\n",
+		stdout);
+
+	exit(EX_OK);
+}
+
+int main(int argc, char **argv) {
+
+	int c;
+
+	while ((c = getopt(argc, argv, "fhmnpsv")) != -1) {
+		switch(c) {
+			case 'f': _f = true; break;
+			case 'h': help(); break;
+			case 'm': _m = true; break;
+			case 'n': _n = true; break;
+			case 'p': _p = true; break;
+			case 's': _s = true; break;
+			case 'v': _v = true; break;
+			case ':':
+			case '?':
+			default:
+				usage();
+				break;
+		}
+	}
+
+	argv += optind;
+	argc -= optind;
+
+	if (!argc) usage();
+
+	for (int i = 0; i < argc; ++i) one_dir(argv[i]);
+
+	return _rv;
+}
\ No newline at end of file