New dev build

Models/IPackageManager.cs

@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Threading.Tasks;
+using Avalonia.Controls;
+
+namespace CrossLangDevStudio.Models;
+
+public interface IPackageManager
+{
+    Task InstallPackageAsync(string name, CrossLangVersion version);
+    string Filter { get; }
+    void UninstallPackage(string name);
+
+    IEnumerable<CrossLangDependency> GetInstalledPackages();
+}
+
+public static class PackageManagerExtensions
+{
+    public static string Summarize(this string txt)
+    {
+        var lines = txt.Replace("\r", "").Split('\n');
+        bool needsthreedots = false;
+        if (lines.Length > 1) needsthreedots = true;
+        if (lines.Length == 0) return "";
+        if (lines[0].Length > 120) { needsthreedots = true; lines[0] = lines[0].Substring(0, 120); }
+        if (needsthreedots) return $"{lines[0]}...";
+        return lines[0];
+    }
+    public static bool IsPackageInstalled(this IPackageManager pm, string name)
+    {
+        foreach (var item in pm.GetInstalledPackages())
+        {
+            if (item.Name == name) return true;
+        }
+        return false;
+    }
+    public static async Task InstallPackageAsync(this IPackageManager pm, CrossLangDependency dep)
+    {
+        await pm.InstallPackageAsync(dep.Name, dep.Version);
+    }
+}