Add ability to download latest preview

README.md

@@ -9,10 +9,25 @@ To install globally:
 $ dotnet tool install -g installsdkglobaltool
 ```
 
-Usage:
+You can also find InstallSdkGlobalTool [on NuGet here](https://www.nuget.org/packages/InstallSdkGlobalTool/).
+
+## Usage:
+
+You can use this tool to download and install .NET Core SDK versions based on a variety of ways, these are:
+
+### Install based on global.json
 
 1. Navigate to a directory that contains a `global.json` file in your terminal.
 2. Run `$ dotnet install-sdk`
-3. Sit back and relax as the Install SDK global tool installs the version of the SDK required.
+
+The .NET Core Install SDK global tool will then download and launch the installer for the version of the SDK dictated by the global.json file.
+
+### Install latest .NET Core SDK Preview
+
+1. Run `$ dotnet install-sdk --latest-preview` from any directory
+
+The .NET core Install SDK global tool will then download and lauch the installer for the latest preview of the .NET Core SDK.
+
+##Contributions
 
 Big thanks to [@stuartblang](https://twitter.com/stuartblang) who contributed loads to this.

src/DotNetInstallSdk/Acquirables/AcquireResult.cs

@@ -0,0 +1,9 @@
+namespace DotNet.InstallSdk.Acquirables
+{
+    public class AcquireResult
+    {
+        public string Version { get; set; }
+
+        public string ChannelJson { get; set; }
+    }
+}

src/DotNetInstallSdk/Acquirables/GlobalJsonVersion.cs

@@ -42,11 +42,4 @@ public override async Task<AcquireResult> Fetch(HttpClient httpClient)
             };
         }
     }
-
-    public class AcquireResult
-    {
-        public string Version { get; set; }
-
-        public string ChannelJson { get; set; }
-    }
 }

src/DotNetInstallSdk/Acquirables/LatestPreviewVersion.cs

@@ -0,0 +1,28 @@
+using System.Linq;
+using System.Net.Http;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace DotNet.InstallSdk.Acquirables
+{
+    public class LatestPreviewVersion : Acquirable
+    {
+        public LatestPreviewVersion(ITextWriter writer)
+        {
+        }
+
+        public override async Task<AcquireResult> Fetch(HttpClient httpClient)
+        {
+            using var releasesResponse = await JsonDocument.ParseAsync(await httpClient.GetStreamAsync(ReleaseIndex));
+
+            var channel = releasesResponse.RootElement.GetProperty("releases-index").EnumerateArray()
+                .First(x => x.GetProperty("support-phase").GetString() == "preview");
+
+            return new AcquireResult
+            {
+                ChannelJson = channel.GetProperty("releases.json").GetString(),
+                Version = channel.GetProperty("latest-sdk").GetString()
+            };
+        }
+    }
+}

src/DotNetInstallSdk/DotNetInstallSdk.csproj

@@ -8,10 +8,10 @@
         <PackageTags>global tool;install sdk</PackageTags>
         <ToolCommandName>dotnet-install-sdk</ToolCommandName>
         <LangVersion>8</LangVersion>
-        <VersionPrefix>2.0.1</VersionPrefix>
+        <VersionPrefix>2.1.0</VersionPrefix>
         <PackageId>InstallSdkGlobalTool</PackageId>
         <Authors>Joseph Woodward, Stuart Lang</Authors>
-        <Description>A .NET Core Global Tool for installing .NET Core SDK versions based on global.json files</Description>
+        <Description>A .NET Core Global Tool for installing .NET Core SDK versions base on lots of different requirements</Description>
         <PackageProjectUrl>https://github.com/JosephWoodward/DotNetInstallSdkGlobalTool/</PackageProjectUrl>
         <RepositoryUrl>https://github.com/JosephWoodward/DotNetInstallSdkGlobalTool.git</RepositoryUrl> 
         <RepositoryType>git</RepositoryType> 

src/DotNetInstallSdk/InstallSdkTool.cs

@@ -1,3 +1,4 @@
+using System;
 using System.IO;
 using System.Net.Http;
 using System.Threading.Tasks;
@@ -7,16 +8,12 @@ namespace DotNet.InstallSdk
 {
     public static class InstallSdkTool
     {
-        public static void Run(CommandLineArguments args)
+        public static void Run(Acquirable acquirable, ConsoleTextWriter writer)
         {
-            var writer = new ConsoleTextWriter();
-
             try
             {
-                var v = new GlobalJsonVersion(writer);
-
                 var sdkAcquirer = new SdkAcquirer(new HttpClient(), writer, new InstallerLauncher(), new PlatformIdentifier());
-                sdkAcquirer.Acquire(v).GetAwaiter().GetResult();
+                sdkAcquirer.Acquire(acquirable).GetAwaiter().GetResult();
             }
             catch (FileNotFoundException e)
             {

src/DotNetInstallSdk/Program.cs

@@ -1,4 +1,5 @@
-using McMaster.Extensions.CommandLineUtils;
+using DotNet.InstallSdk.Acquirables;
+using McMaster.Extensions.CommandLineUtils;
 
 namespace DotNet.InstallSdk
 {
@@ -7,20 +8,28 @@ class Program
         public static int Main(string[] args)
             => CommandLineApplication.Execute<Program>(args);
 
-/*
         [Option("-LP|--latest-preview", Description = "Install the latest preview version of the .NET Core SDK")]
         public bool LatestPreview { get; } = false;
 
+/*
         [Option("-L|--latest", Description = "Install the latest non-preview version of the .NET Core SDK")]
         public bool Latest { get; } = false;
 */
         private void OnExecute()
         {
-            InstallSdkTool.Run(new CommandLineArguments
+            var writer = new ConsoleTextWriter();
+
+            Acquirable a;
+            if (LatestPreview)
+            {
+                a = new LatestPreviewVersion(writer);
+            }
+            else
             {
-                Latest = false,
-                LatestPreview = false
-            });
+                a = new GlobalJsonVersion(writer);
+            }
+
+            InstallSdkTool.Run(a, writer);
         }
     }
 }