Add the prediction ListView and also hook up with the CommandPrediction APIs introduced in PS 7.1

MockPSConsole/MockPSConsole.csproj

@@ -4,21 +4,21 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>MockPSConsole</RootNamespace>
     <AssemblyName>MockPSConsole</AssemblyName>
-    <TargetFrameworks>net461;netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>net461;net5.0</TargetFrameworks>
     <FileAlignment>512</FileAlignment>
     <ApplicationManifest>Program.manifest</ApplicationManifest>
+    <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
   </PropertyGroup>
 
-  <PropertyGroup Condition="'$(TargetFramework)' == 'netcoreapp3.1'">
-    <RuntimeFrameworkVersion>3.1.6</RuntimeFrameworkVersion>
-  </PropertyGroup>
-
-  <ItemGroup>
+  <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
     <PackageReference Include="System.Xml.XDocument" version="4.3.0" />
     <PackageReference Include="System.Data.DataSetExtensions" version="4.5.0" />
     <PackageReference Include="Microsoft.CSharp" version="4.5.0" />
-    <PackageReference Include="PowerShellStandard.Library" version="5.1.0" Condition="'$(TargetFramework)' == 'net461'" />
-    <PackageReference Include="Microsoft.PowerShell.SDK" version="7.0.3" Condition="'$(TargetFramework)' == 'netcoreapp3.1'" />
+    <PackageReference Include="PowerShellStandard.Library" version="5.1.0" />
+  </ItemGroup>
+
+  <ItemGroup Condition="'$(TargetFramework)' == 'net5.0'">
+    <PackageReference Include="Microsoft.PowerShell.SDK" version="7.1.0-rc.2" />
   </ItemGroup>
 
   <ItemGroup>

PSReadLine.build.ps1

@@ -19,7 +19,7 @@ param(
     [ValidateSet("Debug", "Release")]
     [string]$Configuration = (property Configuration Release),
 
-    [ValidateSet("net461", "netcoreapp3.1")]
+    [ValidateSet("net461", "net5.0")]
     [string]$Framework,
 
     [switch]$CheckHelpContent
@@ -32,7 +32,7 @@ $targetDir = "bin/$Configuration/PSReadLine"
 
 if (-not $Framework)
 {
-    $Framework = if ($PSVersionTable.PSEdition -eq "Core") { "netcoreapp3.1" } else { "net461" }
+    $Framework = if ($PSVersionTable.PSEdition -eq "Core") { "net5.0" } else { "net461" }
 }
 
 Write-Verbose "Building for '$Framework'" -Verbose
@@ -41,8 +41,13 @@ function ConvertTo-CRLF([string] $text) {
     $text.Replace("`r`n","`n").Replace("`n","`r`n")
 }
 
+$polyFillerParams = @{
+    Inputs = { Get-ChildItem Polyfill/*.cs, Polyfill/Polyfill.csproj }
+    Outputs = "Polyfill/bin/$Configuration/$Framework/Microsoft.PowerShell.PSReadLine.Polyfiller.dll"
+}
+
 $binaryModuleParams = @{
-    Inputs  = { Get-ChildItem PSReadLine/*.cs, PSReadLine/PSReadLine.csproj, PSReadLine/PSReadLineResources.resx }
+    Inputs  = { Get-ChildItem PSReadLine/*.cs, PSReadLine/PSReadLine.csproj, PSReadLine/PSReadLineResources.resx, Polyfill/*.cs, Polyfill/Polyfill.csproj }
     Outputs = "PSReadLine/bin/$Configuration/$Framework/Microsoft.PowerShell.PSReadLine2.dll"
 }
 
@@ -56,6 +61,15 @@ $mockPSConsoleParams = @{
     Outputs = "MockPSConsole/bin/$Configuration/$Framework/MockPSConsole.dll"
 }
 
+<#
+Synopsis: Build the Polyfiller assembly
+#>
+task BuildPolyfiller @polyFillerParams -If ($Framework -eq "net461") {
+    ## Build both "net461" and "net5.0"
+    exec { dotnet publish -f "net461" -c $Configuration Polyfill }
+    exec { dotnet publish -f "net5.0" -c $Configuration Polyfill }
+}
+
 <#
 Synopsis: Build main binary module
 #>
@@ -108,7 +122,7 @@ task CheckHelpContent -If $CheckHelpContent {
 <#
 Synopsis: Copy all of the files that belong in the module to one place in the layout for installation
 #>
-task LayoutModule BuildMainModule, {
+task LayoutModule BuildPolyfiller, BuildMainModule, {
     if (-not (Test-Path $targetDir -PathType Container)) {
         New-Item $targetDir -ItemType Directory -Force > $null
     }
@@ -120,22 +134,30 @@ task LayoutModule BuildMainModule, {
         'PSReadLine/PSReadLine.format.ps1xml',
         'PSReadLine/PSReadLine.psm1'
 
-    foreach ($file in $extraFiles)
-    {
+    foreach ($file in $extraFiles) {
         # ensure files have \r\n line endings as the signing tool only uses those endings to avoid mixed endings
         $content = Get-Content -Path $file -Raw
         Set-Content -Path (Join-Path $targetDir (Split-Path $file -Leaf)) -Value (ConvertTo-CRLF $content) -Force
     }
 
+    if ($Framework -eq "net461") {
+        if (-not (Test-Path "$targetDir/net461")) {
+            New-Item "$targetDir/net461" -ItemType Directory -Force > $null
+        }
+        if (-not (Test-Path "$targetDir/net5.0")) {
+            New-Item "$targetDir/net5.0" -ItemType Directory -Force > $null
+        }
+
+        Copy-Item "Polyfill/bin/$Configuration/net461/Microsoft.PowerShell.PSReadLine.Polyfiller.dll" "$targetDir/net461" -Force
+        Copy-Item "Polyfill/bin/$Configuration/net5.0/Microsoft.PowerShell.PSReadLine.Polyfiller.dll" "$targetDir/net5.0" -Force
+    }
+
     $binPath = "PSReadLine/bin/$Configuration/$Framework/publish"
     Copy-Item $binPath/Microsoft.PowerShell.PSReadLine2.dll $targetDir
 
-    if (Test-Path $binPath/System.Runtime.InteropServices.RuntimeInformation.dll)
-    {
+    if (Test-Path $binPath/System.Runtime.InteropServices.RuntimeInformation.dll) {
         Copy-Item $binPath/System.Runtime.InteropServices.RuntimeInformation.dll $targetDir
-    }
-    else
-    {
+    } else {
         Write-Warning "Build using $Framework is not sufficient to be downlevel compatible"
     }
 
@@ -145,8 +167,7 @@ task LayoutModule BuildMainModule, {
     $version = $versionInfo.FileVersion
     $semVer = $versionInfo.ProductVersion
 
-    if ($semVer -match "(.*)-(.*)")
-    {
+    if ($semVer -match "(.*)-(.*)") {
         # Make sure versions match
         if ($matches[1] -ne $version) { throw "AssemblyFileVersion mismatch with AssemblyInformationalVersion" }
         $prerelease = $matches[2]
@@ -159,8 +180,7 @@ task LayoutModule BuildMainModule, {
     $moduleManifestContent | Set-Content -Path $targetDir/PSReadLine.psd1
 
     # Make sure we don't ship any read-only files
-    foreach ($file in (Get-ChildItem -Recurse -File $targetDir))
-    {
+    foreach ($file in (Get-ChildItem -Recurse -File $targetDir)) {
         $file.IsReadOnly = $false
     }
 }, CheckHelpContent

PSReadLine/BasicEditing.cs

@@ -57,6 +57,11 @@ public static void SelfInsert(ConsoleKeyInfo? key = null, object arg = null)
         /// </summary>
         public static void RevertLine(ConsoleKeyInfo? key = null, object arg = null)
         {
+            if (_singleton._prediction.RevertSuggestion())
+            {
+                return;
+            }
+
             if (_singleton._statusIsErrorMessage)
             {
                 // After an edit, clear the error message
@@ -80,7 +85,7 @@ public static void CancelLine(ConsoleKeyInfo? key = null, object arg = null)
             _singleton.ClearStatusMessage(false);
             _singleton._current = _singleton._buffer.Length;
 
-            using var _ = _singleton.PredictionOff();
+            using var _ = _singleton._prediction.DisableScoped();
             _singleton.ForceRender();
 
             _singleton._console.Write("\x1b[91m^C\x1b[0m");
@@ -210,7 +215,7 @@ public static void DeleteCharOrExit(ConsoleKeyInfo? key = null, object arg = nul
 
         private bool AcceptLineImpl(bool validate)
         {
-            using var _ = PredictionOff();
+            using var _ = _prediction.DisableScoped();
 
             ParseInput();
             if (_parseErrors.Any(e => e.IncompleteInput))
@@ -272,12 +277,16 @@ private bool AcceptLineImpl(bool validate)
 
             // Let public API set cursor to end of line incase end of line is end of buffer
             SetCursorPosition(_current);
-            if (_suggestionText != null)
+
+            if (_prediction.ActiveView is PredictionListView listView)
             {
-                ResetSuggestion();
-                _console.BlankRestOfLine();
+                // Send feedback to prediction plugin if a list item is accepted as the final command line.
+                listView.OnSuggestionAccepted();
             }
 
+            // Clear the prediction view if there is one.
+            _prediction.ActiveView.Clear(cursorAtEol: true);
+
             _console.Write("\n");
             _inputAccepted = true;
             return true;

PSReadLine/Cmdlets.cs

@@ -66,8 +66,16 @@ public enum AddToHistoryOption
 
     public enum PredictionSource
     {
-        None,
-        History,
+        None = 1,
+        History = 2,
+        Plugin = 4,
+        HistoryAndPlugin = History | Plugin,
+    }
+
+    public enum PredictionViewStyle
+    {
+        InlineView,
+        ListView,
     }
 
     public class PSConsoleReadLineOptions
@@ -85,9 +93,14 @@ public class PSConsoleReadLineOptions
         public const ConsoleColor DefaultEmphasisColor  = ConsoleColor.Cyan;
         public const ConsoleColor DefaultErrorColor     = ConsoleColor.Red;
 
-        // Use dark black by default for the suggestion text.
         // Find the most suitable color using https://stackoverflow.com/a/33206814
-        public const string DefaultInlinePredictionColor = "\x1b[38;5;238m";
+        // Default prediction color settings:
+        //  - use FG color 'dark black' for the inline-view suggestion text
+        //  - use FG color 'yellow' for the list-view suggestion text
+        //  - use BG color 'dark black' for the selected list-view suggestion text
+        public const string DefaultInlinePredictionColor       = "\x1b[38;5;238m";
+        public const string DefaultListPredictionColor         = "\x1b[33m";
+        public const string DefaultListPredictionSelectedColor = "\x1b[48;5;238m";
 
         public static EditMode DefaultEditMode = RuntimeInformation.IsOSPlatform(OSPlatform.Windows)
             ? EditMode.Windows
@@ -144,6 +157,8 @@ public class PSConsoleReadLineOptions
         /// </summary>
         public const PredictionSource DefaultPredictionSource = PredictionSource.None;
 
+        public const PredictionViewStyle DefaultPredictionViewStyle = PredictionViewStyle.InlineView;
+
         /// <summary>
         /// How long in milliseconds should we wait before concluding
         /// the input is not an escape sequence?
@@ -171,6 +186,7 @@ public PSConsoleReadLineOptions(string hostName)
             HistorySaveStyle = DefaultHistorySaveStyle;
             AnsiEscapeTimeout = DefaultAnsiEscapeTimeout;
             PredictionSource = DefaultPredictionSource;
+            PredictionViewStyle = DefaultPredictionViewStyle;
             MaximumHistoryCount = 0;
 
             var historyFileName = hostName + "_history.txt";
@@ -309,6 +325,7 @@ public object ContinuationPromptColor
 
         public bool HistorySearchCaseSensitive { get; set; }
         internal StringComparison HistoryStringComparison => HistorySearchCaseSensitive ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
+        internal StringComparer HistoryStringComparer => HistorySearchCaseSensitive ? StringComparer.Ordinal : StringComparer.OrdinalIgnoreCase;
 
         /// <summary>
         /// How are command and insert modes indicated when in vi edit mode?
@@ -331,6 +348,11 @@ public object ContinuationPromptColor
         /// </summary>
         public PredictionSource PredictionSource { get; set; }
 
+        /// <summary>
+        /// Sets the view style for rendering predictive suggestions.
+        /// </summary>
+        public PredictionViewStyle PredictionViewStyle { get; set; }
+
         /// <summary>
         /// How long in milliseconds should we wait before concluding
         /// the input is not an escape sequence?
@@ -457,6 +479,18 @@ public object InlinePredictionColor
             set => _inlinePredictionColor = VTColorUtils.AsEscapeSequence(value);
         }
 
+        public object ListPredictionColor
+        {
+            get => _listPredictionColor;
+            set => _listPredictionColor = VTColorUtils.AsEscapeSequence(value);
+        }
+
+        public object ListPredictionSelectedColor
+        {
+            get => _listPredictionSelectedColor;
+            set => _listPredictionSelectedColor = VTColorUtils.AsEscapeSequence(value);
+        }
+
         internal string _defaultTokenColor;
         internal string _commentColor;
         internal string _keywordColor;
@@ -472,6 +506,8 @@ public object InlinePredictionColor
         internal string _errorColor;
         internal string _selectionColor;
         internal string _inlinePredictionColor;
+        internal string _listPredictionColor;
+        internal string _listPredictionSelectedColor;
 
         internal void ResetColors()
         {
@@ -489,7 +525,9 @@ internal void ResetColors()
             MemberColor       = DefaultNumberColor;
             EmphasisColor     = DefaultEmphasisColor;
             ErrorColor        = DefaultErrorColor;
-            InlinePredictionColor = DefaultInlinePredictionColor;
+            InlinePredictionColor       = DefaultInlinePredictionColor;
+            ListPredictionColor         = DefaultListPredictionColor;
+            ListPredictionSelectedColor = DefaultListPredictionSelectedColor;
 
             var bg = Console.BackgroundColor;
             if (fg == VTColorUtils.UnknownColor || bg == VTColorUtils.UnknownColor)
@@ -527,6 +565,8 @@ internal void SetColor(string property, object value)
                         {"Member", (o, v) => o.MemberColor = v},
                         {"Selection", (o, v) => o.SelectionColor = v},
                         {"InlinePrediction", (o, v) => o.InlinePredictionColor = v},
+                        {"ListPrediction", (o, v) => o.ListPredictionColor = v},
+                        {"ListPredictionSelected", (o, v) => o.ListPredictionSelectedColor = v},
                     };
 
                 Interlocked.CompareExchange(ref ColorSetters, setters, null);
@@ -550,7 +590,9 @@ public class GetPSReadLineOption : PSCmdlet
         [ExcludeFromCodeCoverage]
         protected override void EndProcessing()
         {
-            WriteObject(PSConsoleReadLine.GetOptions());
+            var options = PSConsoleReadLine.GetOptions();
+            WriteObject(options);
+            PSConsoleReadLine.WarnWhenWindowSizeTooSmallForView(options.PredictionViewStyle, this);
         }
     }
 
@@ -741,6 +783,14 @@ public PredictionSource PredictionSource
         }
         internal PredictionSource? _predictionSource;
 
+        [Parameter]
+        public PredictionViewStyle PredictionViewStyle
+        {
+            get => _predictionViewStyle.GetValueOrDefault();
+            set => _predictionViewStyle = value;
+        }
+        internal PredictionViewStyle? _predictionViewStyle;
+
         [Parameter]
         public Hashtable Colors { get; set; }