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using System.Threading;
using System.Threading.Tasks;
namespace ElectronNET.API
{
/// <summary>
/// Manipulate the command line arguments for your app that Chromium reads.
/// </summary>
public sealed class CommandLine
{
internal CommandLine() { }
internal static CommandLine Instance
{
get
{
if (_commandLine == null)
{
lock (_syncRoot)
{
if (_commandLine == null)
{
_commandLine = new CommandLine();
}
}
}
return _commandLine;
}
}
private static CommandLine _commandLine;
private static object _syncRoot = new object();
/// <summary>
/// Append a switch (with optional value) to Chromium's command line.
/// </summary>
/// <param name="the_switch">A command-line switch, without the leading --</param>
/// <param name="value">(optional) - A value for the given switch</param>
/// <remarks>
/// Note: This will not affect process.argv. The intended usage of this function is to control Chromium's behavior.
/// </remarks>
public void AppendSwitch(string the_switch, string value = "")
{
BridgeConnector.Socket.Emit("appCommandLineAppendSwitch", the_switch, value);
}
/// <summary>
/// Append an argument to Chromium's command line. The argument will be quoted correctly. Switches will precede arguments regardless of appending order.
///
/// If you're appending an argument like <code>--switch=value</code>, consider using <code>appendSwitch('switch', 'value')</code> instead.
/// </summary>
/// <param name="value">The argument to append to the command line</param>
/// <remarks>
/// Note: This will not affect process.argv. The intended usage of this function is to control Chromium's behavior.
/// </remarks>
public void AppendArgument(string value)
{
BridgeConnector.Socket.Emit("appCommandLineAppendArgument", value);
}
/// <summary>
/// Whether the command-line switch is present.
/// </summary>
/// <param name="switchName">A command-line switch</param>
/// <param name="cancellationToken"></param>
/// <returns>Whether the command-line switch is present.</returns>
public async Task<bool> HasSwitchAsync(string switchName, CancellationToken cancellationToken = default(CancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
var taskCompletionSource = new TaskCompletionSource<bool>();
using (cancellationToken.Register(() => taskCompletionSource.TrySetCanceled()))
{
BridgeConnector.Socket.On("appCommandLineHasSwitchCompleted", (result) =>
{
BridgeConnector.Socket.Off("appCommandLineHasSwitchCompleted");
taskCompletionSource.SetResult((bool)result);
});
BridgeConnector.Socket.Emit("appCommandLineHasSwitch", switchName);
return await taskCompletionSource.Task.ConfigureAwait(false);
}
}
/// <summary>
/// The command-line switch value.
/// </summary>
/// <param name="switchName">A command-line switch</param>
/// <param name="cancellationToken"></param>
/// <returns>The command-line switch value.</returns>
/// <remarks>
/// Note: When the switch is not present or has no value, it returns empty string.
/// </remarks>
public async Task<string> GetSwitchValueAsync(string switchName, CancellationToken cancellationToken = default(CancellationToken))
{
cancellationToken.ThrowIfCancellationRequested();
var taskCompletionSource = new TaskCompletionSource<string>();
using (cancellationToken.Register(() => taskCompletionSource.TrySetCanceled()))
{
BridgeConnector.Socket.On("appCommandLineGetSwitchValueCompleted", (result) =>
{
BridgeConnector.Socket.Off("appCommandLineGetSwitchValueCompleted");
taskCompletionSource.SetResult((string)result);
});
BridgeConnector.Socket.Emit("appCommandLineGetSwitchValue", switchName);
return await taskCompletionSource.Task.ConfigureAwait(false);
}
}
}
}