Accept single-hyphen usage and rename -programdatadir to -datadir

For backwards compatibility, modify the args[] strings to replace single-hyphens with double-hyphens before parsing.

Also rename -programdatadir to -datadir.

Emby.Server.Implementations/StartupOptions.cs

@@ -7,8 +7,8 @@ namespace Emby.Server.Implementations
     /// </summary>
     public class StartupOptions
     {
-        [Option('d', "programdata", Required = false, HelpText = "Path to use for program data (databases files etc.).")]
+        [Option('d', "datadir", Required = false, HelpText = "Path to use for the data folder (databases files etc.).")]
-        public string PathProgramData { get; set; }
+        public string PathData { get; set; }
 
         [Option('c', "configdir", Required = false, HelpText = "Path to use for config data (user policies and puctures).")]
         public string PathConfig { get; set; }

Jellyfin.Server/Program.cs

@@ -27,6 +27,7 @@ using ILogger = Microsoft.Extensions.Logging.ILogger;
 namespace Jellyfin.Server
 {
     using CommandLine;
+    using System.Text.RegularExpressions;
 
     public static class Program
     {
@@ -37,6 +38,18 @@ namespace Jellyfin.Server
 
         public static async Task Main(string[] args)
         {
+            // For backwards compatibility.
+            // Modify any input arguments now which start with single-hyphen to POSIX standard
+            // double-hyphen to allow parsing by CommandLineParser package.
+            var pattern = @"^(-[^-\s]{2})"; // Match -xx, not -x, not --xx, not xx
+            var substitution = @"-$1"; // Prepend with additional single-hyphen
+            var regex = new Regex(pattern);
+
+            for (var i = 0; i < args.Length; i++)
+            {
+                args[i] = regex.Replace(args[i], substitution);
+            }
+
             // For CommandLine package, change default behaviour to output errors to stdout (instead of stderr)
             var parser = new Parser(config => config.HelpWriter = Console.Out);
 
@@ -139,9 +152,9 @@ namespace Jellyfin.Server
             string programDataPath = Environment.GetEnvironmentVariable("JELLYFIN_DATA_PATH");
             if (string.IsNullOrEmpty(programDataPath))
             {
-                if (options.PathProgramData != null)
+                if (options.PathData != null)
                 {
-                    programDataPath = options.PathProgramData;
+                    programDataPath = options.PathData;
                 }
                 else
                 {