/// <summary>
/// Attempts to locate the command line client executable.
/// </summary>
/// <param name="type">
/// Which client type to attempt to locate; or <c>null</c> to locate any.
/// </param>
/// <returns>
/// A <see cref="KeyValuePair{TKey,TValue}"/> containing the type of client
/// located and the full path to the client executable, or an empty value if no client could be located.
/// </returns>
private static KeyValuePair<GuiClientType, string> LocateClient(GuiClientType? type)
{
IEnumerable<string> paths =
from path in Environment.GetEnvironmentVariable("PATH").Split(';')
where !StringEx.IsNullOrWhiteSpace(path)
select path.Trim();
if (type == null || type == GuiClientType.PyQT)
{
string client =
(from path in paths
let executablePath = Path.Combine(path, "thg.exe")
where File.Exists(executablePath)
select executablePath).FirstOrDefault();
if (client != null)
return new KeyValuePair<GuiClientType, string>(GuiClientType.PyQT, client);
}
if (type == null || type == GuiClientType.PyGTK)
{
string client =
(from path in paths
let executablePath = Path.Combine(path, "hgtk.exe")
where File.Exists(executablePath)
select executablePath).FirstOrDefault();
if (client != null)
return new KeyValuePair<GuiClientType, string>(GuiClientType.PyGTK, client);
}
return new KeyValuePair<GuiClientType, string>(GuiClientType.None, string.Empty);
}
/// <summary>
/// This method will throw a <see cref="InvalidOperationException"/> if the "wrong" client type is installed, to
/// signal that a given property on a command object can only be used from a specific client type.
/// </summary>
/// <param name="propertyName">
/// The name of the property.
/// </param>
/// <param name="requiredClientType">
/// The required client type.
/// </param>
/// <exception cref="InvalidOperationException">
/// The property is not available in the installed client.
/// </exception>
protected static void EnsurePropertyAvailability(string propertyName, GuiClientType requiredClientType)
{
if (GuiClient.ClientType != requiredClientType)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "The property {0} is not available in the installed client", propertyName));
}
}
static GuiClient()
{
KeyValuePair<GuiClientType, string> result = LocateClient(null);
ClientPath = result.Value;
_ClientType = result.Key;
Initialize();
}
/// <summary>
/// Assigns the <see cref="Current"/> <see cref="TortoiseHgClient"/> implementation based on the
/// <see cref="GuiClientType"/> specified.
/// </summary>
/// <param name="clientType">
/// The <see cref="GuiClientType"/> to assign the client for.
/// </param>
/// <exception cref="InvalidOperationException">Internal error, unknown client type passed to TortoiseHgClient.AssignCurrent</exception>
internal static void AssignCurrent(GuiClientType clientType)
{
switch (clientType)
{
case GuiClientType.PyGTK:
Current = new TortoiseHgPyGTKClient();
break;
case GuiClientType.PyQT:
Current = new TortoiseHgPyQTClient();
break;
default:
throw new InvalidOperationException("Internal error, unknown client type passed to TortoiseHgClient.AssignCurrent");
}
}
/// <summary>
/// Assigns the <see cref="Current"/> <see cref="TortoiseHgClient"/> implementation based on the
/// <see cref="GuiClientType"/> specified.
/// </summary>
/// <param name="clientType">
/// The <see cref="GuiClientType"/> to assign the client for.
/// </param>
/// <exception cref="System.InvalidOperationException">Internal error, unknown client type passed to TortoiseHgClient.AssignCurrent</exception>
internal static void AssignCurrent(GuiClientType clientType)
{
switch (clientType)
{
case GuiClientType.PyGTK:
Current = new TortoiseHgPyGTKClient();
break;
case GuiClientType.PyQT:
Current = new TortoiseHgPyQTClient();
break;
default:
throw new InvalidOperationException("Internal error, unknown client type passed to TortoiseHgClient.AssignCurrent");
}
}
/// <summary>
/// Determines if the specified client type is available on this system.
/// </summary>
/// <param name="clientType">
/// The type of client to look for.
/// </param>
/// <returns>
/// <c>true</c> if the client executable was located; otherwise, <c>false</c>.
/// </returns>
/// <exception cref="ArgumentException">
/// <para><paramref name="clientType"/> can not be <see cref="GuiClientType.None"/> or an undefined value.</para>
/// </exception>
public static bool GetClientAvailability(GuiClientType clientType)
{
if (clientType == GuiClientType.None)
throw new ArgumentException("clientType cannot be GuiClientType.None");
if (!Enum.IsDefined(typeof(GuiClientType), clientType))
throw new ArgumentException("clientType must be a predefined value");
return LocateClient(clientType).Key == clientType;
}
