/*
* Constructor
*
* Boots up the shell, loads all PATH and ENV information required
*/
CSharpShell()
{
// Check we're running on a supported platform
this.OsVersionCheck();
// IO wrapper
this.console = new ShellConsole();
}
/*
* Reads in one command from the console.
*
* Commands trailing with \ will allow for the command to continue on the next line.
* This takes precedence over multiline strings, e.g. the following command:
*
* echo "Very long sentence that gets \
* split into two different lines"
*
* Will be resolved to:
*
* echo "Very long sentence that gets split into two different lines"
*/
public static string ReadCommand(ShellConsole io)
{
string cmd = "";
while (true)
{
cmd += io.ReadLine();
// multiline commands
if (!cmd.EndsWith("\\"))
{
break;
}
// Delete trailing backslash
cmd = cmd.Remove(cmd.Length - 1);
}
return(cmd);
}
private static void ChangeDirectory(List <string> args, ShellConsole io)
{
// cd does nothing for no arguments
if (args.Count == 0)
{
return;
}
Debug.WriteLine(args[0]);
// Attempt to change directory, print error if not possible
try
{
Directory.SetCurrentDirectory(args[0]);
}
catch (FileNotFoundException f)
{
io.WriteLine(f.Message);
}
catch (DirectoryNotFoundException d)
{
io.WriteLine(d.Message);
}
}
public static bool RunSpecialCommand(string command, List <string> arguments, ShellConsole io)
{
foreach (string cmd in ReservedWords)
{
// If given command is special command
if (cmd.ToLower() == command.ToLower())
{
// Switch on command
switch (command.ToLower())
{
case "cd":
ChangeDirectory(arguments, io);
break;
case "exit":
Exit();
break;
default:
Console.WriteLine("Error - Program '" + command + "' matched special command, but reached default in command switch");
Environment.Exit(1);
// To keep compiler happy
break;
}
return(true);
}
}
// No special command found
return(false);
}