Base for 4.3 work. Split Nadeko.Common into a separate project

src/Nadeko.Common/Extensions/ArrayExtensions.cs

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+namespace Nadeko.Common;
+
+// made for expressions because they almost never get added
+// and they get looped through constantly
+public static class ArrayExtensions
+{
+    /// <summary>
+    ///     Create a new array from the old array + new element at the end
+    /// </summary>
+    /// <param name="input">Input array</param>
+    /// <param name="added">Item to add to the end of the output array</param>
+    /// <typeparam name="T">Type of the array</typeparam>
+    /// <returns>A new array with the new element at the end</returns>
+    public static T[] With<T>(this T[] input, T added)
+    {
+        var newExprs = new T[input.Length + 1];
+        Array.Copy(input, 0, newExprs, 0, input.Length);
+        newExprs[input.Length] = added;
+        return newExprs;
+    }
+
+    /// <summary>
+    ///     Creates a new array by applying the specified function to every element in the input array
+    /// </summary>
+    /// <param name="arr">Array to modify</param>
+    /// <param name="f">Function to apply</param>
+    /// <typeparam name="TIn">Orignal type of the elements in the array</typeparam>
+    /// <typeparam name="TOut">Output type of the elements of the array</typeparam>
+    /// <returns>New array with updated elements</returns>
+    public static TOut[] Map<TIn, TOut>(this TIn[] arr, Func<TIn, TOut> f)
+        => Array.ConvertAll(arr, x => f(x));
+
+    /// <summary>
+    ///     Creates a new array by applying the specified function to every element in the input array
+    /// </summary>
+    /// <param name="col">Array to modify</param>
+    /// <param name="f">Function to apply</param>
+    /// <typeparam name="TIn">Orignal type of the elements in the array</typeparam>
+    /// <typeparam name="TOut">Output type of the elements of the array</typeparam>
+    /// <returns>New array with updated elements</returns>
+    public static TOut[] Map<TIn, TOut>(this IReadOnlyCollection<TIn> col, Func<TIn, TOut> f)
+    {
+        var toReturn = new TOut[col.Count];
+        
+        var i = 0;
+        foreach (var item in col)
+            toReturn[i++] = f(item);
+
+        return toReturn;
+    }
+}

src/Nadeko.Common/Extensions/EnumerableExtensions.cs

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+using System.Security.Cryptography;
+
+namespace Nadeko.Common;
+
+public static class EnumerableExtensions
+{
+    /// <summary>
+    ///     Concatenates the members of a collection, using the specified separator between each member.
+    /// </summary>
+    /// <param name="data">Collection to join</param>
+    /// <param name="separator">
+    ///     The character to use as a separator. separator is included in the returned string only if
+    ///     values has more than one element.
+    /// </param>
+    /// <param name="func">Optional transformation to apply to each element before concatenation.</param>
+    /// <typeparam name="T">The type of the members of values.</typeparam>
+    /// <returns>
+    ///     A string that consists of the members of values delimited by the separator character. -or- Empty if values has
+    ///     no elements.
+    /// </returns>
+    public static string Join<T>(this IEnumerable<T> data, char separator, Func<T, string>? func = null)
+        => string.Join(separator, data.Select(func ?? (x => x?.ToString() ?? string.Empty)));
+
+    /// <summary>
+    ///     Concatenates the members of a collection, using the specified separator between each member.
+    /// </summary>
+    /// <param name="data">Collection to join</param>
+    /// <param name="separator">
+    ///     The string to use as a separator.separator is included in the returned string only if values
+    ///     has more than one element.
+    /// </param>
+    /// <param name="func">Optional transformation to apply to each element before concatenation.</param>
+    /// <typeparam name="T">The type of the members of values.</typeparam>
+    /// <returns>
+    ///     A string that consists of the members of values delimited by the separator character. -or- Empty if values has
+    ///     no elements.
+    /// </returns>
+    public static string Join<T>(this IEnumerable<T> data, string separator, Func<T, string>? func = null)
+        => string.Join(separator, data.Select(func ?? (x => x?.ToString() ?? string.Empty)));
+
+    /// <summary>
+    ///     Randomize element order by performing the Fisher-Yates shuffle
+    /// </summary>
+    /// <typeparam name="T">Item type</typeparam>
+    /// <param name="items">Items to shuffle</param>
+    public static IReadOnlyList<T> Shuffle<T>(this IEnumerable<T> items)
+    {
+        using var provider = RandomNumberGenerator.Create();
+        var list = items.ToList();
+        var n = list.Count;
+        while (n > 1)
+        {
+            var box = new byte[(n / byte.MaxValue) + 1];
+            int boxSum;
+            do
+            {
+                provider.GetBytes(box);
+                boxSum = box.Sum(b => b);
+            } while (!(boxSum < n * (byte.MaxValue * box.Length / n)));
+
+            var k = boxSum % n;
+            n--;
+            (list[k], list[n]) = (list[n], list[k]);
+        }
+
+        return list;
+    }
+
+    /// <summary>
+    ///     Initializes a new instance of the <see cref="ConcurrentDictionary{TKey,TValue}" /> class
+    ///     that contains elements copied from the specified <see cref="IEnumerable{T}" />
+    ///     has the default concurrency level, has the default initial capacity,
+    ///     and uses the default comparer for the key type.
+    /// </summary>
+    /// <param name="dict">
+    ///     The <see cref="IEnumerable{T}" /> whose elements are copied to the new
+    ///     <see cref="ConcurrentDictionary{TKey,TValue}" />.
+    /// </param>
+    /// <returns>A new instance of the <see cref="ConcurrentDictionary{TKey,TValue}" /> class</returns>
+    public static ConcurrentDictionary<TKey, TValue> ToConcurrent<TKey, TValue>(
+        this IEnumerable<KeyValuePair<TKey, TValue>> dict)
+        where TKey : notnull
+        => new(dict);
+
+    public static IndexedCollection<T> ToIndexed<T>(this IEnumerable<T> enumerable)
+        where T : class, IIndexed
+        => new(enumerable);
+
+    /// <summary>
+    ///     Creates a task that will complete when all of the <see cref="Task{TResult}" /> objects in an enumerable
+    ///     collection have completed
+    /// </summary>
+    /// <param name="tasks">The tasks to wait on for completion.</param>
+    /// <typeparam name="TResult">The type of the completed task.</typeparam>
+    /// <returns>A task that represents the completion of all of the supplied tasks.</returns>
+    public static Task<TResult[]> WhenAll<TResult>(this IEnumerable<Task<TResult>> tasks)
+        => Task.WhenAll(tasks);
+
+    /// <summary>
+    ///     Creates a task that will complete when all of the <see cref="Task" /> objects in an enumerable
+    ///     collection have completed
+    /// </summary>
+    /// <param name="tasks">The tasks to wait on for completion.</param>
+    /// <returns>A task that represents the completion of all of the supplied tasks.</returns>
+    public static Task WhenAll(this IEnumerable<Task> tasks)
+        => Task.WhenAll(tasks);
+}

src/Nadeko.Common/Extensions/HttpClientExtensions.cs

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+using System.Net.Http.Headers;
+
+namespace Nadeko.Common;
+
+public static class HttpClientExtensions
+{
+    public static HttpClient AddFakeHeaders(this HttpClient http)
+    {
+        AddFakeHeaders(http.DefaultRequestHeaders);
+        return http;
+    }
+
+    public static void AddFakeHeaders(this HttpHeaders dict)
+    {
+        dict.Clear();
+        dict.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
+        dict.Add("User-Agent",
+            "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/14.0.835.202 Safari/535.1");
+    }
+
+    public static bool IsImage(this HttpResponseMessage msg)
+        => IsImage(msg, out _);
+
+    public static bool IsImage(this HttpResponseMessage msg, out string? mimeType)
+    {
+        mimeType = msg.Content.Headers.ContentType?.MediaType;
+        if (mimeType is "image/png" or "image/jpeg" or "image/gif")
+            return true;
+
+        return false;
+    }
+
+    public static long GetContentLength(this HttpResponseMessage msg)
+        => msg.Content.Headers.ContentLength ?? long.MaxValue;
+}

src/Nadeko.Common/Extensions/PipeExtensions.cs

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+namespace Nadeko.Common;
+
+public delegate TOut PipeFunc<TIn, out TOut>(in TIn a);
+public delegate TOut PipeFunc<TIn1, TIn2, out TOut>(in TIn1 a, in TIn2 b);
+
+public static class PipeExtensions
+{
+    public static TOut Pipe<TIn, TOut>(this TIn a, Func<TIn, TOut> fn)
+        => fn(a);
+    
+    public static TOut Pipe<TIn, TOut>(this TIn a, PipeFunc<TIn, TOut> fn)
+        => fn(a);
+    
+    public static TOut Pipe<TIn1, TIn2, TOut>(this (TIn1, TIn2) a, PipeFunc<TIn1, TIn2, TOut> fn)
+        => fn(a.Item1, a.Item2);
+
+    public static (TIn, TExtra) With<TIn, TExtra>(this TIn a, TExtra b)
+        => (a, b);
+    
+    public static async Task<TOut> Pipe<TIn, TOut>(this Task<TIn> a, Func<TIn, TOut> fn)
+        => fn(await a);
+}