WhatsApp message statistics. Needs LinqPad to run.

whatsapp.linq

<Query Kind="Program">
  <Namespace>System.Globalization</Namespace>
</Query>

// Open a chat, click "..." and email to yourself (no media)
void Main()
{
	var messages = new List<Message>();
	string file = File.ReadAllText(@"/wapp.txt"); // c:\wapp.txt
	
	string[] lines = file.Split('\n');
	
	for (int i = 0; i < lines.Length; i++)
	{
		var parts = new List<string>();
		int dashIndex = lines[i].IndexOf(" - ");

		if (dashIndex != -1)
		{
			int colonIndex = lines[i].IndexOf(":", dashIndex);

			if (colonIndex > -1)
			{
				string date = lines[i].Substring(0, dashIndex);
				string name = lines[i].Substring(dashIndex +3, colonIndex - (dashIndex +3));
				string text = lines[i].Substring(colonIndex +2, lines[i].Length - (colonIndex +2));

				var message = new Message()
				{
					Date = DateTime.Parse(date),
					Name = name,
					Text = text
				};
				
				messages.Add(message);
			}
		}
	}
	
	Console.WriteLine("{0} messages", messages.Count());
	
	// All days
	var groupedBy = messages.GroupBy(x => x.Date.Date);
	foreach (var item in groupedBy)
	{
		//Console.WriteLine("{0}\t\t{1}", item.Key.ToString("dd ddd MMM"), item.Count());
	}

	var groupedByDay = messages.GroupBy(x => x.Date.Date.Month);
	foreach (var item in groupedByDay)
	{
		Console.WriteLine("{0}-{1}", item.Key, item.Count());
	}

	var groupedByHour = messages.GroupBy(x => x.Date.Hour);
	foreach (var item in groupedByHour)
	{
		//Console.WriteLine("{0}\t\t{1}", item.Key, item.Count());
	}

	foreach (var item in messages.Where(x => x.Date.Date == DateTime.Now.Date))
	{
		//Console.WriteLine("{0}", item.Date.Hour);
	}
}

public class Message
{
	public DateTime Date { get; set; }
	public string Name { get; set; }
	public string Text { get; set; }
}