sourcegit/src/Commands/GitIgnore.cs

using System.IO;

namespace SourceGit.Commands
{
    public static class GitIgnore
    {
        public static void Add(string repo, string pattern)
        {
            var file = Path.Combine(repo, ".gitignore");
            if (!File.Exists(file))
            {
                File.WriteAllLines(file, [pattern]);
                return;
            }

            var org = File.ReadAllText(file);
            if (!org.EndsWith('\n'))
                File.AppendAllLines(file, ["", pattern]);
            else
                File.AppendAllLines(file, [pattern]);
        }
    }
}