From: Mikko Rasa <tdb@tdb.fi>
Date: Sun, 31 Jul 2011 15:34:38 +0000 (+0300)
Subject: Add an ls example to demonstrate some of the fs components
X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=commitdiff_plain;h=857c4856742bc3f5b327098b3f82e4cb58644d2b

Add an ls example to demonstrate some of the fs components
---

diff --git a/Build b/Build
index 318f341..fc7b33a 100644
--- a/Build
+++ b/Build
@@ -93,6 +93,15 @@ package "mspcore"
 		};
 	};
 
+	program "ls"
+	{
+		source "examples/ls.cpp";
+		build_info
+		{
+			library "mspcore";
+		};
+	};
+
 	tarball "@src"
 	{
 		source "License.txt";
diff --git a/examples/ls.cpp b/examples/ls.cpp
new file mode 100644
index 0000000..fd4d71f
--- /dev/null
+++ b/examples/ls.cpp
@@ -0,0 +1,146 @@
+#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/print.h>
+#include <msp/time/datetime.h>
+
+using namespace std;
+using namespace Msp;
+
+class Ls: public RegisteredApplication<Ls>
+{
+private:
+	typedef vector<string> Row;
+
+	bool long_format;
+	vector<string> args;
+
+public:
+	Ls(int, char **);
+
+	virtual int main();
+private:
+	Row create_row(const string &, const FS::Stat &);
+	void print_rows(const list<Row> &);
+};
+
+Ls::Ls(int argc, char **argv):
+	long_format(false)
+{
+	GetOpt getopt;
+	getopt.add_option('l', "long", long_format, GetOpt::NO_ARG);
+	getopt(argc, argv);
+
+	args = getopt.get_args();
+	if(args.empty())
+		args.push_back(".");
+}
+
+int Ls::main()
+{
+	list<Row> file_rows;
+	bool first = true;
+	for(vector<string>::const_iterator i=args.begin(); i!=args.end(); ++i)
+	{
+		FS::Path path = *i;
+		FS::Stat stat = FS::lstat(path);
+		if(stat.is_directory())
+		{
+			list<Row> rows;
+			list<string> files = FS::list_files(path);
+			files.sort();
+			for(list<string>::iterator j=files.begin(); j!=files.end(); ++j)
+			{
+				if(long_format)
+					rows.push_back(create_row(*j, FS::lstat(path / *j)));
+				else
+				{
+					Row r;
+					r.push_back(*j);
+					rows.push_back(r);
+				}
+			}
+
+			if(!first)
+				IO::print("\n");
+			if(args.size()>1)
+				IO::print("%s:\n", *i);
+			print_rows(rows);
+
+			first = false;
+		}
+		else if(long_format)
+			file_rows.push_back(create_row(*i, stat));
+		else
+		{
+			Row r;
+			r.push_back(*i);
+			file_rows.push_back(r);
+		}
+	}
+
+	if(!file_rows.empty())
+	{
+		if(!first)
+			IO::print("\n");
+		print_rows(file_rows);
+	}
+
+	return 0;
+}
+
+Ls::Row Ls::create_row(const string &name, const FS::Stat &st)
+{
+	Row result;
+	if(st.is_regular())
+		result.push_back("-");
+	else if(st.is_directory())
+		result.push_back("D");
+	else if(st.is_symlink())
+		result.push_back("L");
+	else
+		result.push_back("?");
+
+	result.push_back(st.get_owner());
+	result.push_back(st.get_group());
+	result.push_back(format("%d", st.get_size()));
+	result.push_back(Time::DateTime(st.get_modify_time()).format("%Y-%m-%d %H:%M:%S"));
+	result.push_back(name);
+
+	return result;
+}
+
+void Ls::print_rows(const list<Row> &rows)
+{
+	vector<unsigned> col_width;
+
+	for(list<Row>::const_iterator i=rows.begin(); i!=rows.end(); ++i)
+	{
+		const Row &row = *i;
+		if(row.size()>col_width.size())
+			col_width.resize(row.size(), 0);
+		for(unsigned j=0; j<row.size(); ++j)
+			col_width[j] = max(col_width[j], row[j].size());
+	}
+
+	for(list<Row>::const_iterator i=rows.begin(); i!=rows.end(); ++i)
+	{
+		const Row &row = *i;
+		string line;
+		for(unsigned j=0; j<row.size(); ++j)
+		{
+			if(j>0)
+				line += ' ';
+			unsigned padding = col_width[j]-row[j].size();
+			if(j==3)
+				line += string(padding, ' ');
+			line += row[j];
+			if(j!=3)
+				line += string(padding, ' ');
+		}
+		line += '\n';
+		IO::print(line);
+	}
+}