create: add --crystal option

Library/Homebrew/dev-cmd/create.rb

@@ -23,6 +23,8 @@ module Homebrew
              description: "Create a basic template for an Autotools-style build."
       switch "--cmake",
              description: "Create a basic template for a CMake-style build."
+      switch "--crystal",
+             description: "Create a basic template for a Crystal build."
       switch "--go",
              description: "Create a basic template for a Go build."
       switch "--meson",
@@ -50,7 +52,7 @@ module Homebrew
       switch :force
       switch :verbose
       switch :debug
-      conflicts "--autotools", "--cmake", "--go", "--meson", "--perl", "--python", "--rust"
+      conflicts "--autotools", "--cmake", "--crystal", "--go", "--meson", "--perl", "--python", "--rust"
       named 1
     end
   end
@@ -82,6 +84,8 @@ module Homebrew
       :autotools
     elsif args.meson?
       :meson
+    elsif args.crystal?
+      :crystal
     elsif args.go?
       :go
     elsif args.perl?

Library/Homebrew/formula_creator.rb

@@ -103,6 +103,8 @@ module Homebrew
 
         <% if mode == :cmake %>
           depends_on "cmake" => :build
+        <% elsif mode == :crystal %>
+          depends_on "crystal" => :build
         <% elsif mode == :go %>
           depends_on "go" => :build
         <% elsif mode == :meson %>
@@ -138,6 +140,9 @@ module Homebrew
                                   "--disable-dependency-tracking",
                                   "--disable-silent-rules",
                                   "--prefix=\#{prefix}"
+        <% elsif mode == :crystal %>
+            system "shards", "build", "--release"
+            bin.install "bin/#{name}"
         <% elsif mode == :go %>
             system "go", "build", *std_go_args
         <% elsif mode == :meson %>

completions/bash/brew

@@ -162,6 +162,7 @@ _brew_create() {
       --HEAD
       --autotools
       --cmake
+      --crystal
       --debug
       --force
       --go

docs/Manpage.md

@@ -769,6 +769,8 @@ a simple example. For the complete API, see:
   Create a basic template for an Autotools-style build.
 * `--cmake`:
   Create a basic template for a CMake-style build.
+* `--crystal`:
+  Create a basic template for a Crystal build.
 * `--go`:
   Create a basic template for a Go build.
 * `--meson`:

manpages/brew.1

@@ -999,6 +999,10 @@ Create a basic template for an Autotools\-style build\.
 Create a basic template for a CMake\-style build\.
 .
 .TP
+\fB\-\-crystal\fR
+Create a basic template for a Crystal build\.
+.
+.TP
 \fB\-\-go\fR
 Create a basic template for a Go build\.
 .