finish first version of TextViewer plug-in

QuickLook.Plugin.TextViewer/Plugin.cs

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+using System.IO;
+using System.Windows;
+using ICSharpCode.AvalonEdit.Highlighting;
+
+namespace QuickLook.Plugin.TextViewer
+{
+    public class Plugin : IViewer
+    {
+        private TextViewerPanel _tvp;
+
+        public int Priority => 0;
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            // ReSharper disable once InconsistentNaming
+            const long MAX_SIZE = 20 * 1024 * 1024;
+
+            // if there is a possible highlighting scheme (by file extension), treat it as a plain text file
+            if (HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(path)) != null)
+                return new FileInfo(path).Length <= MAX_SIZE;
+
+            // otherwise, read the first 512 bytes as string (StreamReader handles encoding automatically),
+            // check whether they are all printable chars. 
+            using (var sr = new StreamReader(new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
+            {
+                var buffer = new char[512];
+                var len = sr.Read(buffer, 0, 512);
+
+                for (var i = 0; i < len; i++)
+                {
+                    if (!char.IsControl(buffer[i])) continue;
+
+                    if (buffer[i] != '\r' && buffer[i] != '\n' && buffer[i] != '\t')
+                        return false;
+                }
+
+                return new FileInfo(path).Length <= MAX_SIZE;
+            }
+        }
+
+        public void BoundSize(string path, ViewContentContainer container)
+        {
+            container.PreferedSize = new Size {Width = 800, Height = 600};
+        }
+
+        public void View(string path, ViewContentContainer container)
+        {
+            _tvp = new TextViewerPanel(path);
+
+            container.SetContent(_tvp);
+            container.Title = $"{Path.GetFileName(path)}";
+        }
+
+        public void Close()
+        {
+        }
+    }
+}

QuickLook.Plugin.TextViewer/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("QuickLook.Plugin.TextViewer")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("QuickLook.Plugin.TextViewer")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("ae041682-e3a1-44f6-8bb4-916a98d89fbe")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

QuickLook.Plugin.TextViewer/QuickLook.Plugin.TextViewer.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{AE041682-E3A1-44F6-8BB4-916A98D89FBE}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>QuickLook.Plugin.TextViewer</RootNamespace>
+    <AssemblyName>QuickLook.Plugin.TextViewer</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>..\Build\Debug\Plugins\QuickLook.Plugin.TextViewer\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\Build\Release\Plugins\QuickLook.Plugin.TextViewer\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <PlatformTarget>x86</PlatformTarget>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="ICSharpCode.AvalonEdit, Version=5.0.3.0, Culture=neutral, PublicKeyToken=9cc39be672370310, processorArchitecture=MSIL">
+      <HintPath>..\packages\AvalonEdit.5.0.3\lib\Net40\ICSharpCode.AvalonEdit.dll</HintPath>
+    </Reference>
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xaml" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Xml" />
+    <Reference Include="WindowsBase" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Plugin.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="TextViewerPanel.xaml.cs">
+      <DependentUpon>TextViewerPanel.xaml</DependentUpon>
+    </Compile>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\QuickLook\QuickLook.csproj">
+      <Project>{8b4a9ce5-67b5-4a94-81cb-3771f688fdeb}</Project>
+      <Name>QuickLook</Name>
+      <Private>False</Private>
+    </ProjectReference>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Page Include="TextViewerPanel.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

QuickLook.Plugin.TextViewer/TextViewerPanel.xaml

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+<UserControl x:Class="QuickLook.Plugin.TextViewer.TextViewerPanel"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:avalonEdit="http://icsharpcode.net/sharpdevelop/avalonedit"
+             xmlns:local="clr-namespace:QuickLook.Plugin.TextViewer"
+             mc:Ignorable="d"
+             d:DesignHeight="317.974"
+             d:DesignWidth="448.79"
+             UseLayoutRounding="True">
+    <Grid>
+        <avalonEdit:TextEditor x:Name="viewer" Background="#00FFFFFF" FontFamily="Consolas" ShowLineNumbers="True"
+                               WordWrap="True" IsReadOnly="True" />
+    </Grid>
+</UserControl>

QuickLook.Plugin.TextViewer/TextViewerPanel.xaml.cs

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+using System.IO;
+using System.Windows.Controls;
+using ICSharpCode.AvalonEdit.Highlighting;
+
+namespace QuickLook.Plugin.TextViewer
+{
+    /// <summary>
+    ///     Interaction logic for TextViewerPanel.xaml
+    /// </summary>
+    public partial class TextViewerPanel : UserControl
+    {
+        public TextViewerPanel(string path)
+        {
+            InitializeComponent();
+
+            LoadFile(path);
+        }
+
+        private void LoadFile(string path)
+        {
+            viewer.Load(path);
+
+            viewer.SyntaxHighlighting = HighlightingManager.Instance.GetDefinitionByExtension(Path.GetExtension(path));
+        }
+    }
+}

QuickLook.Plugin.TextViewer/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+
+<packages>
+  <package id="AvalonEdit" version="5.0.3" targetFramework="net452" />
+</packages>