Pretty Hosts

PrettyHosts.csx

#!/usr/bin/env dotnet-script

using System.Runtime.CompilerServices;
using System.IO;
using System.Text.RegularExpressions;

public static string GetScriptFolder([CallerFilePath] string path = null) => Path.GetDirectoryName(path);
static readonly var HOST_PATH = Environment.OSVersion.Platform == PlatformID.Unix ? "/etc/hosts" : @"C:\Windows\System32\drivers\etc\hosts";

public static async Task<IDictionary<String, List<String>>> GetPrettyHosts()
{
    var lines = await File.ReadAllLinesAsync(HOST_PATH);

    var result = lines.ToList()
        .Select(line => line.Trim())
        .Where(line => !line.StartsWith("#") && !String.IsNullOrWhiteSpace(line))
        .Select(line => Regex.Split(line, @"\s+"))
        .Select(blocks => new KeyValuePair<String, List<String>>(blocks[0], blocks.Skip(1).Where(block => block[0] != '#').ToList()))
        .Where(kvs => kvs.Value.Count() > 0)
        .Aggregate(new SortedDictionary<String, List<String>>(), (prev, next) =>
        {
            List<String> domains = prev.GetValueOrDefault(next.Key, new List<String>());
            domains.AddRange(next.Value);
            domains.Sort();
            prev[next.Key] = domains;
            return prev;
        });

    return result;
}
public static async Task<String> PrettyHostsToFile(String targetHostFileName = "hosts")
{
    var hosts = await GetPrettyHosts();
    var hostsData = String.Join(Environment.NewLine, hosts.Select(kv => $"{kv.Key} {String.Join(" ", kv.Value)}"));
    var filePath = $"{GetScriptFolder()}{Path.DirectorySeparatorChar}{targetHostFileName}";
    await File.WriteAllTextAsync(filePath, hostsData);
    return filePath;
}

RunPrettyHost.csx

#!/usr/bin/env dotnet-script

using System.Runtime.CompilerServices;
using System.IO;
using System.Text.RegularExpressions;

static readonly var HOST_PATH = Environment.OSVersion.Platform == PlatformID.Unix ? "/etc/hosts" : @"C:\Windows\System32\drivers\etc\hosts";
public static String DomainCommentSub(String domain)
{
    String[] splitted = domain.Split("#");
    return splitted[0];
}
public static async Task<IDictionary<String, List<String>>> GetPrettyHosts()
{
    var lines = await File.ReadAllLinesAsync(HOST_PATH);

    var result = lines.ToList()
        .Select(line => line.Trim())
        .Where(line => !line.StartsWith("#") && !String.IsNullOrWhiteSpace(line))
        .Select(line => Regex.Split(line, @"\s+").Distinct().ToList())
        .Select(blocks => new KeyValuePair<String, List<String>>(blocks[0], blocks.Skip(1).Where(block => block[0] != '#').Select(block => block.Split("#")[0]).ToList()))
        .Where(kvs => kvs.Value.Count() > 0)
        .Aggregate(new SortedDictionary<String, List<String>>(), (prev, next) =>
        {
            List<String> domains = prev.GetValueOrDefault(next.Key, new List<String>());
            domains.AddRange(next.Value);
            domains.Sort();
            prev[next.Key] = domains;
            return prev;
        });

    return result;
}
public static async Task<String> PrettyHostsToFile(String targetHostFileName = "hosts")
{
    var hosts = await GetPrettyHosts();
    var hostsData = String.Join(Environment.NewLine, hosts.Select(kv => $"{kv.Key} {String.Join(" ", kv.Value)}"));
    var filePath = $"{Environment.GetFolderPath(Environment.SpecialFolder.Desktop)}{Path.DirectorySeparatorChar}{targetHostFileName}";
    await File.WriteAllTextAsync(filePath, hostsData);
    return filePath;
}

var filePath = await PrettyHostsToFile();
Console.WriteLine($"格式化后的host文件保存在: {filePath}");

Execute follow command:

dotnet script https://dwz.cn/xpsKTaoi

This will save prettied hosts to your desktop.