m3uTool/M3uCreate.cs

using System;
using System.Diagnostics;
using System.IO;

namespace m3uTool
{
    /// <summary>
    /// Summary description for m3uFromDirectory.
    /// </summary>
    public class M3uCreate
    {
        /// <summary>
        /// Directory to grab the files from
        /// </summary>
        private readonly DirectoryInfo mInputDir;

        /// <summary>
        /// Filter for input filenames
        /// </summary>
        private string mFileFilter = "*.mp3";

        /// <summary>
        /// Ouput m3u filename, if it isn't generated
        /// </summary>
        private string mOutputFilename;

        /// <summary>
        /// Use the parent's directory name for the m3u name
        /// </summary>
        private bool mUseGeneratedOuputFilename = true;

        public M3uCreate(string dir) : this(new DirectoryInfo(dir))
        {
        }

        public M3uCreate(DirectoryInfo inputDir)
        {
            mInputDir = inputDir;
        }

        public bool UseGeneratedOuputFilename
        {
            get { return mUseGeneratedOuputFilename; }
            set { mUseGeneratedOuputFilename = value; }
        }

        public string OutputFilename
        {
            get
            {
                if (mUseGeneratedOuputFilename)
                {
                    Debug.WriteLine("OutputFilename:" + mInputDir.FullName + "\\" + mInputDir.Name + ".m3u");
                    return mInputDir.FullName + "\\" + mInputDir.Name + ".m3u";
                }
                return mOutputFilename;
            }
            set
            {
                mOutputFilename = value;
                mUseGeneratedOuputFilename = false;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <remarks>
        /// dir: "\foo\bar\" file: "\foo\bar\myfile" output: ""
        /// dir: "\foo\" file: "\foo\bar\myfile" output: ".."
        /// dir: "\" file: "\foo\bar\myfile" output: "..\.."
        /// dir: "\har" file: "\foo\bar\myfile" output: "..\..\har"
        /// dir: "\foo\bar\hey\" file: "\foo\bar\myfile" output: "hey\"
        /// </remarks>
        /// <param name="dir"></param>
        /// <param name="file"></param>
        /// <returns></returns>
        private string GetPath(DirectoryInfo dir, FileInfo file)
        {
            string source = dir.FullName;
            string target = file.Directory.FullName;

            return GetPath(source, target);
        }

        /// <summary>
        /// Gets the path.
        /// </summary>
        /// <param name="source">The source.</param>
        /// <param name="target">The target.</param>
        /// <returns></returns>
        private string GetPath(string source, string target)
        {
            int lastCommonIndex = GetLastCommonIndex(source, target);
            Debug.WriteLine(String.Format("s:{0} , t:{1} lastCommon:{2} ", source, target, lastCommonIndex));

            int slashCount = CountCharacters(source, lastCommonIndex + 1, '\\');

            string path = "";
            for (int i = 0; i < slashCount; i++)
            {
                path += "..\\";
            }
            path += target.Substring(lastCommonIndex);
            if (path.Length > 0 && path[path.Length - 1] != '\\')
                path += "\\";
            Debug.WriteLine(path);
            return path;
        }

        private int CountCharacters(string str, int startIdx, char c)
        {
            int charsCount = 0;
            int currIdx = startIdx;
            while (currIdx < str.Length && (currIdx = str.IndexOf(c, currIdx) + 1) != 0)
                charsCount++;
            return charsCount;
        }

        private int GetLastCommonIndex(string str1, string str2)
        {
            int i = 0;
            while (i < str1.Length && i < str2.Length && Char.ToLower(str1[i]) == Char.ToLower(str2[i]))
                i++;
            return i;
        }

        public void Create()
        {
            string fileList = "";
            DirectoryInfo ouputDirectory = (new FileInfo(OutputFilename)).Directory;
            foreach (FileInfo info in mInputDir.GetFiles(mFileFilter))
            {
                string fileName = GetPath(ouputDirectory, info) + info.Name;
                Debug.WriteLine(fileName);
                fileList += fileName + Environment.NewLine;
            }
            SaveToFile(fileList, OutputFilename);
        }

        private void SaveToFile(string contents, string outputFilename)
        {
            using (TextWriter tw = new StreamWriter(outputFilename))
            {
                tw.Write(contents);
            }
        }
    }
}