Add csv viewer

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/CsvViewerPanel.xaml

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+<UserControl x:Class="QuickLook.Plugin.CsvViewer.CsvViewerPanel"
+             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:local="clr-namespace:QuickLook.Plugin.CsvViewer"
+             x:Name="csvViewer"
+             mc:Ignorable="d"
+             d:DesignHeight="300" d:DesignWidth="300">
+    <Grid>
+        <DataGrid x:Name="dataGrid" AlternationCount="2" BorderThickness="0" Background="Transparent"
+                  RowBackground="Transparent" GridLinesVisibility="None"
+                  IsReadOnly="True" HeadersVisibility="None"
+                  AutoGenerateColumns="False" CanUserReorderColumns="False"
+                  ItemsSource="{Binding Path=Rows,ElementName=csvViewer}" AlternatingRowBackground="#99ECECEC" />
+
+    </Grid>
+</UserControl>

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/CsvViewerPanel.xaml.cs

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+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Media;
+using CsvHelper;
+
+namespace QuickLook.Plugin.CsvViewer
+{
+    /// <summary>
+    ///     Interaction logic for CsvViewerPanel.xaml
+    /// </summary>
+    public partial class CsvViewerPanel : UserControl
+    {
+        public CsvViewerPanel()
+        {
+            InitializeComponent();
+        }
+
+        public List<string[]> Rows { get; private set; } = new List<string[]>();
+
+        public void LoadFile(string path)
+        {
+            const int limit = 100000;
+            var binded = false;
+
+            using (var sr = new StreamReader(path))
+            {
+                using (var parser = new CsvParser(sr))
+                {
+                    var i = 0;
+                    while (true)
+                    {
+                        var row = parser.Read();
+                        if (row == null)
+                            break;
+                        row = Concat(new[] {$"{i++ + 1}".PadLeft(6)}, row);
+
+                        if (!binded)
+                        {
+                            SetupColumnBinding(row.Length);
+                            binded = true;
+                        }
+
+                        if (i > limit)
+                        {
+                            Rows.Add(Enumerable.Repeat("...", row.Length).ToArray());
+                            break;
+                        }
+
+                        Rows.Add(row);
+                    }
+                }
+            }
+        }
+
+        private void SetupColumnBinding(int rowLength)
+        {
+            for (var i = 0; i < rowLength; i++)
+            {
+                var col = new DataGridTextColumn
+                {
+                    FontFamily = new FontFamily("Consolas"),
+                    FontWeight = FontWeight.FromOpenTypeWeight(i == 0 ? 700 : 400),
+                    Binding = new Binding($"[{i}]")
+                };
+                dataGrid.Columns.Add(col);
+            }
+        }
+
+        public static T[] Concat<T>(T[] x, T[] y)
+        {
+            if (x == null) throw new ArgumentNullException("x");
+            if (y == null) throw new ArgumentNullException("y");
+            var oldLen = x.Length;
+            Array.Resize(ref x, x.Length + y.Length);
+            Array.Copy(y, 0, x, oldLen, y.Length);
+            return x;
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/Plugin.cs

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+// Copyright <20> 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.IO;
+using System.Windows;
+
+namespace QuickLook.Plugin.CsvViewer
+{
+    public class Plugin : IViewer
+    {
+        private CsvViewerPanel _panel;
+
+        public int Priority => int.MaxValue;
+        public bool AllowsTransparency => true;
+
+        public void Init()
+        {
+        }
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            return Path.GetExtension(path).ToLower() == ".csv";
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            context.PreferredSize = new Size {Width = 1000, Height = 700};
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            _panel = new CsvViewerPanel();
+
+            context.ViewerContent = _panel;
+            context.Title = $"{Path.GetFileName(path)}";
+            _panel.LoadFile(path);
+
+            context.IsBusy = false;
+        }
+
+        public void Cleanup()
+        {
+            GC.SuppressFinalize(this);
+
+            _panel = null;
+        }
+
+        ~Plugin()
+        {
+            Cleanup();
+        }
+    }
+}

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/Properties/AssemblyInfo.cs

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+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Windows;
+
+// 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.CsvViewer")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("QuickLook.Plugin.CsvViewer")]
+[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)]
+
+//In order to begin building localizable applications, set
+//<UICulture>CultureYouAreCodingWith</UICulture> in your .csproj file
+//inside a <PropertyGroup>.  For example, if you are using US english
+//in your source files, set the <UICulture> to en-US.  Then uncomment
+//the NeutralResourceLanguage attribute below.  Update the "en-US" in
+//the line below to match the UICulture setting in the project file.
+
+//[assembly: NeutralResourcesLanguage("en-US", UltimateResourceFallbackLocation.Satellite)]
+
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+    //(used if a resource is not found in the page,
+    // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+    //(used if a resource is not found in the page,
+    // app, or any theme specific resource dictionaries)
+)]
+
+
+// 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.*")]

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/QuickLook.Plugin.CsvViewer.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>{863ECAAC-18D9-4256-A27D-0F308089FB47}</ProjectGuid>
+    <OutputType>library</OutputType>
+    <RootNamespace>QuickLook.Plugin.CsvViewer</RootNamespace>
+    <AssemblyName>QuickLook.Plugin.CsvViewer</AssemblyName>
+    <TargetFrameworkVersion>v4.6.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{60dc8134-eba5-43b8-bcc9-bb4bc16c2548};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>..\..\Build\Debug\QuickLook.Plugin\QuickLook.Plugin.CsvViewer\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>..\..\Build\Release\QuickLook.Plugin\QuickLook.Plugin.CsvViewer\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
+    <DebugSymbols>true</DebugSymbols>
+    <OutputPath>..\..\Build\Debug\QuickLook.Plugin\QuickLook.Plugin.CsvViewer\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <DebugType>full</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Release|x86'">
+    <OutputPath>..\..\Build\Release\QuickLook.Plugin\QuickLook.Plugin.CsvViewer\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <Optimize>true</Optimize>
+    <DebugType>pdbonly</DebugType>
+    <PlatformTarget>x86</PlatformTarget>
+    <ErrorReport>prompt</ErrorReport>
+    <CodeAnalysisRuleSet>MinimumRecommendedRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="CsvHelper, Version=2.0.0.0, Culture=neutral, PublicKeyToken=8c4959082be5c823, processorArchitecture=MSIL">
+      <HintPath>..\..\packages\CsvHelper.2.16.3.0\lib\net45\CsvHelper.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xaml">
+      <RequiredTargetFramework>4.0</RequiredTargetFramework>
+    </Reference>
+    <Reference Include="WindowsBase" />
+    <Reference Include="PresentationCore" />
+    <Reference Include="PresentationFramework" />
+  </ItemGroup>
+  <ItemGroup>
+    <Page Include="CsvViewerPanel.xaml">
+      <Generator>MSBuild:Compile</Generator>
+      <SubType>Designer</SubType>
+    </Page>
+    <Compile Include="..\..\GitVersion.cs">
+      <Link>Properties\GitVersion.cs</Link>
+    </Compile>
+    <Compile Include="Plugin.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="CsvViewerPanel.xaml.cs">
+      <DependentUpon>CsvViewerPanel.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </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>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

QuickLook.Plugin/QuickLook.Plugin.CsvViewer/packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+
+<packages>
+  <package id="CsvHelper" version="2.16.3.0" targetFramework="net462" />
+</packages>