HeadingInfo.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System;
using System.IO;
using System.Reflection;
using System.Text;
 
using CommandLine.Infrastructure;
 
using CSharpx;
 
namespace CommandLine.Text
{
    public class HeadingInfo
    {
        private readonly string programName;
        private readonly string version;
 
        public HeadingInfo(string programName, string version = null)
        {
            if (string.IsNullOrWhiteSpace("programName"))
            {
                throw new ArgumentException("programName");
            }
 
            this.programName = programName;
            this.version = version;
        }
 
        public static HeadingInfo Empty => new HeadingInfo("");
 
        public static HeadingInfo Default
        {
            get
            {
                string title = ReflectionHelper.GetAttribute<AssemblyTitleAttribute>()
                                               .MapValueOrDefault(titleAttribute => titleAttribute.Title,
                                                                  ReflectionHelper.GetAssemblyName()
                                                                 );
 
                string version = ReflectionHelper.GetAttribute<AssemblyInformationalVersionAttribute>()
                                                 .MapValueOrDefault(versionAttribute =>
                                                                        versionAttribute.InformationalVersion,
                                                                    ReflectionHelper.GetAssemblyVersion()
                                                                   );
 
                return new HeadingInfo(title, version);
            }
        }
 
        public static implicit operator string(HeadingInfo info)
        {
            return info.ToString();
        }
 
        public override string ToString()
        {
            bool isVersionNull = string.IsNullOrEmpty(version);
 
            return new StringBuilder(programName.Length +
                                     (!isVersionNull ? version.Length + 1 : 0)
                                    )
                   .Append(programName)
                   .AppendWhen(!isVersionNull, " ", version)
                   .ToString();
        }
 
        public void WriteMessage(string message, TextWriter writer)
        {
            if (string.IsNullOrWhiteSpace("message"))
            {
                throw new ArgumentException("message");
            }
 
            if (writer == null)
            {
                throw new ArgumentNullException("writer");
            }
 
            writer.WriteLine(new StringBuilder(programName.Length + message.Length + 2)
                             .Append(programName)
                             .Append(": ")
                             .Append(message)
                             .ToString()
                            );
        }
 
        public void WriteMessage(string message)
        {
            WriteMessage(message, Console.Out);
        }
 
        public void WriteError(string message)
        {
            WriteMessage(message, Console.Error);
        }
    }
}