add my exa fork

It supports `-A` so that chruby can get sourced correctly.

exa.rb

@@ -0,0 +1,61 @@
+class Exa < Formula
+  desc "Modern replacement for 'ls'"
+  homepage "https://the.exa.website"
+  sha256 "ff0fa0bfc4edef8bdbbb3cabe6fdbd5481a71abbbcc2159f402dea515353ae7c"
+  license "MIT"
+  head "https://github.com/kejadlen/exa.git", branch: "main"
+
+  livecheck do
+    url :stable
+    strategy :github_latest
+  end
+
+  bottle do
+    rebuild 1
+    sha256 cellar: :any_skip_relocation, arm64_monterey: "6d0565b8b078c0af60f359c273f8fb2b5bd4832f66f9ba2cce6ac1e6a3a6782c"
+    sha256 cellar: :any_skip_relocation, arm64_big_sur:  "2b9cc70621644245ce1ab1b682e28efae4b8acdbf3bf4da9cf91ddbd786b8787"
+    sha256 cellar: :any_skip_relocation, monterey:       "116ebfabdd5f5a06725dcd563c1bb05f723b3543f5204985a3f7dc7089a5d765"
+    sha256 cellar: :any_skip_relocation, big_sur:        "d0c809ae7a8d3a43e0c907854b46725f5ad6bb14fa40a9857ff4e74f15c0b961"
+    sha256 cellar: :any_skip_relocation, catalina:       "dc183942b94bac912f4e0a6ca5c8859fa755a95de2808bd978dde3911690f0ae"
+    sha256 cellar: :any_skip_relocation, mojave:         "62fac977958ef8a9856e7a28fceac53d4f6e327e11764d1a077fb34ac83aced0"
+    sha256 cellar: :any_skip_relocation, x86_64_linux:   "fad8013ab85b04c039c1b1be716bd621370dfcf810e3eb714e53711701b9aa45"
+  end
+
+  depends_on "pandoc" => :build
+  depends_on "rust" => :build
+
+  uses_from_macos "zlib"
+
+  on_linux do
+    depends_on "libgit2"
+  end
+
+  def install
+    system "cargo", "install", *std_cargo_args
+
+    if build.head?
+      bash_completion.install "completions/bash/exa"
+      zsh_completion.install  "completions/zsh/_exa"
+      fish_completion.install "completions/fish/exa.fish"
+    else
+      # Remove after >0.10.1 build
+      bash_completion.install "completions/completions.bash" => "exa"
+      zsh_completion.install  "completions/completions.zsh"  => "_exa"
+      fish_completion.install "completions/completions.fish" => "exa.fish"
+    end
+
+    args = %w[
+      --standalone
+      --to=man
+    ]
+    system "pandoc", *args, "man/exa.1.md", "-o", "exa.1"
+    system "pandoc", *args, "man/exa_colors.5.md", "-o", "exa_colors.5"
+    man1.install "exa.1"
+    man5.install "exa_colors.5"
+  end
+
+  test do
+    (testpath/"test.txt").write("")
+    assert_match "test.txt", shell_output("#{bin}/exa")
+  end
+end