/// <summary>
/// Writes a list of all the shell commands in the specified assembly to the standard output stream.
/// </summary>
/// <param name="assembly">The assembly that contains the shell commands.</param>
/// <exception cref="ArgumentNullException">
/// <paramref name="assembly"/> is <see langword="null"/>.
/// </exception>
/// <remarks>
/// <para>
/// This method writes a list of all shell command names and their descriptions to the standard output stream, wrapping
/// the lines to fit on the console automatically.
/// </para>
/// <para>
/// A command's name is retrieved from its <see cref="ShellCommandAttribute"/> attribute, and the description is retrieved
/// from its <see cref="DescriptionAttribute"/> attribute.
/// </para>
/// <para>
/// Line wrapping at word boundaries is applied to the output, wrapping at the console's window width. When the console output is
/// redirected to a file, Microsoft .Net will still report the console's actual window width, but on Mono the value of
/// the <see cref="Console.WindowWidth"/> property will be 0. In that case, the usage information will not be wrapped.
/// </para>
/// <para>
/// This method indents additional lines for the command descriptions, unless the <see cref="Console.WindowWidth"/> property is less than 31.
/// </para>
/// </remarks>
public static void WriteAssemblyCommandListToConsole(Assembly assembly)
{
using (LineWrappingTextWriter writer = LineWrappingTextWriter.ForConsoleOut())
{
WriteAssemblyCommandList(writer, assembly);
}
}
/// <summary>
/// Finds and instantiates the shell command with the specified name, or if that fails, writes error and usage information to the specified writers.
/// </summary>
/// <param name="assembly">The assembly to search for the shell command.</param>
/// <param name="commandName">The name of the command.</param>
/// <param name="args">The arguments to the shell command.</param>
/// <param name="index">The index in <paramref name="args"/> at which to start parsing the arguments.</param>
/// <param name="options">The options to use.</param>
/// <returns>An instance a class deriving from <see cref="ShellCommand"/>, or <see langword="null"/> if the command was not found or an error occurred parsing the arguments.</returns>
/// <exception cref="ArgumentNullException">
/// <paramref name="assembly"/>, <paramref name="args"/>, or <paramref name="options"/> is <see langword="null"/>
/// </exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> does not fall inside the bounds of <paramref name="args"/>.</exception>
/// <remarks>
/// <para>
/// If the command could not be found, a list of possible commands is written to <see cref="CreateShellCommandOptions.Out"/>. If an error occurs parsing the command's arguments, the error
/// message is written to <see cref="CreateShellCommandOptions.Error"/>, and the shell command's usage information is written to <see cref="CreateShellCommandOptions.Out"/>.
/// </para>
/// <para>
/// If the <see cref="CreateShellCommandOptions.Out"/> property or <see cref="CreateShellCommandOptions.Error"/> property is <see langword="null"/>, output
/// is written to the standard output and error streams respectively, with line wrapping at word boundaries applied to the output, wrapping at the console's window width. When the console output is
/// redirected to a file, Microsoft .Net will still report the console's actual window width, but on Mono the value of
/// the <see cref="Console.WindowWidth"/> property will be 0. In that case, the usage information will not be wrapped.
/// </para>
/// <para>
/// If the <see cref="CreateShellCommandOptions.Out"/> property or <see cref="CreateShellCommandOptions.Error"/> property are instance of the
/// <see cref="LineWrappingTextWriter"/> class, this method indents additional lines for the usage syntax and argument descriptions according
/// to the values specified by the <see cref="CreateShellCommandOptions"/>, unless the <see cref="LineWrappingTextWriter.MaximumLineLength"/> property is less than 30.
/// </para>
/// </remarks>
public static ShellCommand CreateShellCommand(Assembly assembly, string commandName, string[] args, int index, CreateShellCommandOptions options)
{
if (assembly == null)
{
throw new ArgumentNullException("assembly");
}
if (args == null)
{
throw new ArgumentNullException("args");
}
if (index < 0 || index > args.Length)
{
throw new ArgumentOutOfRangeException("index");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
bool disposeOut = false;
bool disposeError = false;
TextWriter output = options.Out;
TextWriter error = options.Error;
try
{
if (output == null)
{
disposeOut = true;
output = LineWrappingTextWriter.ForConsoleOut();
options.Out = output;
}
if (error == null)
{
disposeError = true;
error = LineWrappingTextWriter.ForConsoleError();
options.Error = error;
}
Type commandType = commandName == null ? null : GetShellCommand(assembly, commandName, options.CommandNameComparer);
if (commandType == null)
{
WriteShellCommandListUsage(output, assembly, options);
}
else if (CommandUsesCustomArgumentParsing(commandType))
{
return((ShellCommand)Activator.CreateInstance(commandType, args, index, options));
}
else
{
CommandLineParser parser = new CommandLineParser(commandType, options.ArgumentNamePrefixes, options.ArgumentNameComparer)
{
AllowDuplicateArguments = options.AllowDuplicateArguments,
AllowWhiteSpaceValueSeparator = options.AllowWhiteSpaceValueSeparator,
};
ShellCommand command = null;
try
{
command = (ShellCommand)parser.Parse(args, index);
}
catch (CommandLineArgumentException ex)
{
error.WriteLine(ex.Message);
error.WriteLine();
}
if (command == null)
{
string originalPrefix = options.UsageOptions.UsagePrefix;
options.UsageOptions.UsagePrefix += " " + GetShellCommandName(commandType);
// If we're writing this to the console, output should already by a LineWrappingTextWriter, so the max line length argument here is ignored.
parser.WriteUsage(output, 0, options.UsageOptions);
options.UsageOptions.UsagePrefix = originalPrefix;
}
else
{
return(command);
}
}
return(null);
}
finally
{
if (disposeOut && output != null)
{
output.Dispose();
}
if (disposeError && error != null)
{
error.Dispose();
}
}
}