add a journal stream to get new events

Journal/Entry.cs

@@ -84,5 +84,12 @@ namespace NonaBGS.Journal {
         public JObject JSON {
             get { return this.json; }
         }
+
+        public override string ToString() {
+            if (json == null) {
+                return "";
+            }
+            return json.ToString();
+        }
     }
 }

Journal/JournalFile.cs

@@ -20,6 +20,13 @@ namespace NonaBGS.Journal
         private static string iso8601 = "yyyyMMddTHHmmss";
         private static string iso8601_notime = "yyyyMMdd";
 
+        public static bool VerifyFile(string path) {
+            string filename = Path.GetFileName(path);
+
+            var matches = fileregex.Matches(filename);
+            return matches.Count != 0;
+        }
+
         private void SetFilename(string path) {
             string filename = Path.GetFileName(path);
             if (!File.Exists(path) || filename == null) {

Journal/JournalStream.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NonaBGS.Journal;
+using System.IO;
+
+namespace NonaBGS.Journal {
+    public class JournalStream {
+        private PlayerJournal journal = null;
+        private FileSystemWatcher watcher = null;
+
+        private Dictionary<string, StreamReader> streams = new Dictionary<string, StreamReader>();
+
+        public delegate void NewJournalEntryDelegate(Entry entry);
+
+        public event NewJournalEntryDelegate NewJournalEntry;
+
+        public PlayerJournal Journal {
+            get => journal;
+            set => journal = value;
+        }
+
+        public JournalStream() {
+        }
+
+        public JournalStream(PlayerJournal journal) {
+            this.journal = journal;
+            Open();
+        }
+
+        public void Open() {
+            if (watcher != null) {
+                return;
+            }
+
+            watcher = new FileSystemWatcher(journal.Location);
+
+            watcher.NotifyFilter = NotifyFilters.FileName |
+                NotifyFilters.LastWrite |
+                NotifyFilters.Size;
+
+            watcher.Changed += Watcher_Changed;
+            watcher.Created += Watcher_Created;
+
+            watcher.Filter = "*.log";
+            watcher.EnableRaisingEvents = true;
+        }
+
+        public void Close() {
+            if (watcher != null) {
+                watcher.EnableRaisingEvents = false;
+            }
+            watcher = null;
+            streams.Clear();
+        }
+
+        private void Watcher_Created(object sender, FileSystemEventArgs e) {
+            if (!streams.ContainsKey(e.FullPath) && JournalFile.VerifyFile(e.FullPath)) {
+                streams[e.FullPath] = new StreamReader(e.FullPath);
+            }
+        }
+
+        private void Watcher_Changed(object sender, FileSystemEventArgs e) {
+            if (!streams.ContainsKey(e.FullPath) && JournalFile.VerifyFile(e.FullPath)) {
+                var filestream = new FileStream(e.FullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
+                streams[e.FullPath] = new StreamReader(filestream);
+            }
+
+            var stream = streams[e.FullPath];
+            if (stream == null) {
+                return;
+            }
+
+            string line;
+
+            while ((line = stream.ReadLine()) != null) {
+                try {
+                    Entry entry = Entry.Parse(line);
+                    NewJournalEntry?.Invoke(entry);
+                } catch (Exception) {
+                }
+            }
+        }
+    }
+}

Journal/PlayerJournal.cs

@@ -11,6 +11,8 @@ namespace NonaBGS.Journal {
         private List<JournalFile> journalfiles = new List<JournalFile>();
         private string basepath = null;
 
+        public string Location => basepath;
+
         public PlayerJournal() {
             Initialise(DefaultPath);
         }

nonabgs.csproj

@@ -77,6 +77,7 @@
     <Compile Include="EDDB\Stations.cs" />
     <Compile Include="Journal\Credits.cs" />
     <Compile Include="Journal\EliteDangerous.cs" />
+    <Compile Include="Journal\JournalStream.cs" />
     <Compile Include="Journal\MarketSellEntry.cs" />
     <Compile Include="Journal\MultiSellExplorationDataEntry.cs" />
     <Compile Include="Journal\RedeemVoucherEntry.cs" />