1 files changed, 79 insertions, 0 deletions
diff --git a/src/DotNetOpenAuth.BuildTasks/Trim.cs b/src/DotNetOpenAuth.BuildTasks/Trim.cs
new file mode 100644
index 0000000..972b87d
--- /dev/null
+++ b/src/DotNetOpenAuth.BuildTasks/Trim.cs
@@ -0,0 +1,79 @@
+//-----------------------------------------------------------------------
+// <copyright file="Trim.cs" company="Andrew Arnott">
+//     Copyright (c) Andrew Arnott. All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace DotNetOpenAuth.BuildTasks {
+	using Microsoft.Build.Framework;
+	using Microsoft.Build.Utilities;
+
+	/// <summary>
+	/// Trims item identities or metadata.
+	/// </summary>
+	public class Trim : Task {
+		/// <summary>
+		/// Gets or sets the name of the metadata to trim.  Leave empty or null to operate on itemspec.
+		/// </summary>
+		/// <value>The name of the metadata.</value>
+		public string MetadataName { get; set; }
+
+		/// <summary>
+		/// Gets or sets the characters that should be trimmed off if found at the start of items' ItemSpecs.
+		/// </summary>
+		public string StartCharacters { get; set; }
+
+		/// <summary>
+		/// Gets or sets the characters that should be trimmed off if found at the end of items' ItemSpecs.
+		/// </summary>
+		public string EndCharacters { get; set; }
+
+		/// <summary>
+		/// Gets or sets the substring that should be trimmed along with everything that appears after it.
+		/// </summary>
+		public string AllAfter { get; set; }
+
+		/// <summary>
+		/// Gets or sets the items with ItemSpec's to be trimmed.
+		/// </summary>
+		[Required]
+		public ITaskItem[] Inputs { get; set; }
+
+		/// <summary>
+		/// Gets or sets the items with trimmed ItemSpec strings.
+		/// </summary>
+		[Output]
+		public ITaskItem[] Outputs { get; set; }
+
+		/// <summary>
+		/// Executes this instance.
+		/// </summary>
+		/// <returns>A value indicating whether the task completed successfully.</returns>
+		public override bool Execute() {
+			this.Outputs = new ITaskItem[this.Inputs.Length];
+			for (int i = 0; i < this.Inputs.Length; i++) {
+				this.Outputs[i] = new TaskItem(this.Inputs[i]);
+				string value = string.IsNullOrEmpty(this.MetadataName) ? this.Outputs[i].ItemSpec : this.Outputs[i].GetMetadata(this.MetadataName);
+				if (!string.IsNullOrEmpty(this.StartCharacters)) {
+					value = value.TrimStart(this.StartCharacters.ToCharArray());
+				}
+				if (!string.IsNullOrEmpty(this.EndCharacters)) {
+					value = value.TrimEnd(this.EndCharacters.ToCharArray());
+				}
+				if (!string.IsNullOrEmpty(this.AllAfter)) {
+					int index = value.IndexOf(this.AllAfter);
+					if (index >= 0) {
+						value = value.Substring(0, index);
+					}
+				}
+				if (string.IsNullOrEmpty(this.MetadataName)) {
+					this.Outputs[i].ItemSpec = value;
+				} else {
+					this.Outputs[i].SetMetadata(this.MetadataName, value);
+				}
+			}
+
+			return true;
+		}
+	}
+}