From: Mikko Rasa <tdb@tdb.fi>
Date: Mon, 9 Jul 2012 14:45:46 +0000 (+0300)
Subject: Add an example that does some directory operations
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=f1e97209d74290a88639cd2895a7b4a86ffee52e

Add an example that does some directory operations
---

diff --git a/Build b/Build
index fc7b33a..8478fc5 100644
--- a/Build
+++ b/Build
@@ -102,6 +102,15 @@ package "mspcore"
 		};
 	};
 
+	program "syncdir"
+	{
+		source "examples/syncdir.cpp";
+		build_info
+		{
+			library "mspcore";
+		};
+	};
+
 	tarball "@src"
 	{
 		source "License.txt";
diff --git a/examples/syncdir.cpp b/examples/syncdir.cpp
new file mode 100644
index 0000000..7d4789a
--- /dev/null
+++ b/examples/syncdir.cpp
@@ -0,0 +1,97 @@
+#include <algorithm>
+#include <msp/core/application.h>
+#include <msp/core/getopt.h>
+#include <msp/fs/dir.h>
+#include <msp/fs/stat.h>
+#include <msp/fs/utils.h>
+#include <msp/io/file.h>
+#include <msp/io/print.h>
+#include <msp/strings/format.h>
+
+using namespace std;
+using namespace Msp;
+
+class SyncDir: public RegisteredApplication<SyncDir>
+{
+private:
+	FS::Path source;
+	FS::Path destination;
+
+public:
+	SyncDir(int, char **);
+
+	int main();
+private:
+	void sync_directory(const FS::Path &, const FS::Path &);
+	void copy_file(const FS::Path &, const FS::Path &);
+};
+
+SyncDir::SyncDir(int argc, char **argv)
+{
+	if(argc<3)
+		throw usage_error("Missing arguments", format("Usage: %s <source> <destination>", argv[0]));
+
+	source = argv[1];
+	destination = argv[2];
+}
+
+int SyncDir::main()
+{
+	sync_directory(source, destination);
+	return 0;
+}
+
+void SyncDir::sync_directory(const FS::Path &src, const FS::Path &dest)
+{
+	IO::print("Syncing %s to %s\n", src, dest);
+
+	FS::Stat st = FS::stat(dest);
+	if(!st)
+		FS::mkpath(dest, 0755);
+	else if(!st.is_directory())
+	{
+		FS::unlink(dest);
+		FS::mkdir(dest, 0755);
+	}
+
+	list<string> src_files = FS::list_files(src);
+	for(list<string>::const_iterator i=src_files.begin(); i!=src_files.end(); ++i)
+	{
+		const string &fn = *i;
+		FS::Stat ss = FS::stat(src/fn);
+		if(ss.is_directory())
+			sync_directory(src/fn, dest/fn);
+		else
+		{
+			FS::Stat ds = FS::stat(dest/fn);
+			if(!ds || ds.get_size()!=ss.get_size())
+				copy_file(src/fn, dest/fn);
+		}
+	}
+
+	list<string> dest_files = FS::list_files(dest);
+	for(list<string>::const_iterator i=dest_files.begin(); i!=dest_files.end(); ++i)
+	{
+		if(find(src_files.begin(), src_files.end(), *i)==src_files.end())
+		{
+			const string &fn = *i;
+			IO::print("Removing obsolete %s\n", dest/fn);
+			if(FS::is_dir(dest/fn))
+				FS::rmpath(dest/fn);
+			else
+				FS::unlink(dest/fn);
+		}
+	}
+}
+
+void SyncDir::copy_file(const FS::Path &src, const FS::Path &dest)
+{
+	IO::File in(src.str(), IO::M_READ);
+	IO::File out(dest.str(), IO::M_WRITE);
+	char buf[16384];
+	while(!in.eof())
+	{
+		unsigned len = in.read(buf, sizeof(buf));
+		out.write(buf, len);
+	}
+}