Port Homebrew::Cmd::Prefix

Library/Homebrew/cmd/--prefix.rb

@@ -1,106 +1,114 @@
 # typed: true
 # frozen_string_literal: true
 
-require "cli/parser"
+require "abstract_command"
+require "fileutils"
 
 module Homebrew
-  sig { returns(CLI::Parser) }
+  module Cmd
-  def self.__prefix_args
+    class Prefix < AbstractCommand
-    Homebrew::CLI::Parser.new do
+      include FileUtils
-      description <<~EOS
-        Display Homebrew's install path. *Default:*
 
-          - macOS ARM: `#{HOMEBREW_MACOS_ARM_DEFAULT_PREFIX}`
+      UNBREWED_EXCLUDE_FILES = %w[.DS_Store].freeze
-          - macOS Intel: `#{HOMEBREW_DEFAULT_PREFIX}`
+      UNBREWED_EXCLUDE_PATHS = %w[
-          - Linux: `#{HOMEBREW_LINUX_DEFAULT_PREFIX}`
+        */.keepme
+        .github/*
+        bin/brew
+        completions/zsh/_brew
+        docs/*
+        lib/gdk-pixbuf-2.0/*
+        lib/gio/*
+        lib/node_modules/*
+        lib/python[23].[0-9]/*
+        lib/python3.[0-9][0-9]/*
+        lib/pypy/*
+        lib/pypy3/*
+        lib/ruby/gems/[12].*
+        lib/ruby/site_ruby/[12].*
+        lib/ruby/vendor_ruby/[12].*
+        manpages/brew.1
+        share/pypy/*
+        share/pypy3/*
+        share/info/dir
+        share/man/whatis
+        share/mime/*
+        texlive/*
+      ].freeze
 
-        If <formula> is provided, display the location where <formula> is or would be installed.
+      sig { override.returns(String) }
-      EOS
+      def self.command_name = "--prefix"
-      switch "--unbrewed",
-             description: "List files in Homebrew's prefix not installed by Homebrew."
-      switch "--installed",
-             description: "Outputs nothing and returns a failing status code if <formula> is not installed."
-      conflicts "--unbrewed", "--installed"
 
-      named_args :formula
+      cmd_args do
-    end
+        description <<~EOS
-  end
+          Display Homebrew's install path. *Default:*
 
-  def self.__prefix
+            - macOS ARM: `#{HOMEBREW_MACOS_ARM_DEFAULT_PREFIX}`
-    args = __prefix_args.parse
+            - macOS Intel: `#{HOMEBREW_DEFAULT_PREFIX}`
+            - Linux: `#{HOMEBREW_LINUX_DEFAULT_PREFIX}`
 
-    raise UsageError, "`--installed` requires a formula argument." if args.installed? && args.no_named?
+          If <formula> is provided, display the location where <formula> is or would be installed.
-
-    if args.unbrewed?
-      raise UsageError, "`--unbrewed` does not take a formula argument." unless args.no_named?
-
-      list_unbrewed
-    elsif args.no_named?
-      puts HOMEBREW_PREFIX
-    else
-      formulae = args.named.to_resolved_formulae
-      prefixes = formulae.filter_map do |f|
-        next nil if args.installed? && !f.opt_prefix.exist?
-
-        # this case will be short-circuited by brew.sh logic for a single formula
-        f.opt_prefix
-      end
-      puts prefixes
-      if args.installed?
-        missing_formulae = formulae.reject(&:optlinked?)
-                                   .map(&:name)
-        return if missing_formulae.blank?
-
-        raise NotAKegError, <<~EOS
-          The following formulae are not installed:
-          #{missing_formulae.join(" ")}
         EOS
+        switch "--unbrewed",
+               description: "List files in Homebrew's prefix not installed by Homebrew."
+        switch "--installed",
+               description: "Outputs nothing and returns a failing status code if <formula> is not installed."
+        conflicts "--unbrewed", "--installed"
+
+        named_args :formula
+      end
+
+      sig { override.void }
+      def run
+        raise UsageError, "`--installed` requires a formula argument." if args.installed? && args.no_named?
+
+        if args.unbrewed?
+          raise UsageError, "`--unbrewed` does not take a formula argument." unless args.no_named?
+
+          list_unbrewed
+        elsif args.no_named?
+          puts HOMEBREW_PREFIX
+        else
+          formulae = args.named.to_resolved_formulae
+          prefixes = formulae.filter_map do |f|
+            next nil if args.installed? && !f.opt_prefix.exist?
+
+            # this case will be short-circuited by brew.sh logic for a single formula
+            f.opt_prefix
+          end
+          puts prefixes
+          if args.installed?
+            missing_formulae = formulae.reject(&:optlinked?)
+                                       .map(&:name)
+            return if missing_formulae.blank?
+
+            raise NotAKegError, <<~EOS
+              The following formulae are not installed:
+              #{missing_formulae.join(" ")}
+            EOS
+          end
+        end
+      end
+
+      private
+
+      def list_unbrewed
+        dirs  = HOMEBREW_PREFIX.subdirs.map { |dir| dir.basename.to_s }
+        dirs -= %w[Library Cellar Caskroom .git]
+
+        # Exclude cache, logs, and repository, if they are located under the prefix.
+        [HOMEBREW_CACHE, HOMEBREW_LOGS, HOMEBREW_REPOSITORY].each do |dir|
+          dirs.delete dir.relative_path_from(HOMEBREW_PREFIX).to_s
+        end
+        dirs.delete "etc"
+        dirs.delete "var"
+
+        arguments = dirs.sort + %w[-type f (]
+        arguments.concat UNBREWED_EXCLUDE_FILES.flat_map { |f| %W[! -name #{f}] }
+        arguments.concat UNBREWED_EXCLUDE_PATHS.flat_map { |d| %W[! -path #{d}] }
+        arguments.push ")"
+
+        cd(HOMEBREW_PREFIX) { safe_system("find", *arguments) }
       end
     end
   end
-
-  UNBREWED_EXCLUDE_FILES = %w[.DS_Store].freeze
-  UNBREWED_EXCLUDE_PATHS = %w[
-    */.keepme
-    .github/*
-    bin/brew
-    completions/zsh/_brew
-    docs/*
-    lib/gdk-pixbuf-2.0/*
-    lib/gio/*
-    lib/node_modules/*
-    lib/python[23].[0-9]/*
-    lib/python3.[0-9][0-9]/*
-    lib/pypy/*
-    lib/pypy3/*
-    lib/ruby/gems/[12].*
-    lib/ruby/site_ruby/[12].*
-    lib/ruby/vendor_ruby/[12].*
-    manpages/brew.1
-    share/pypy/*
-    share/pypy3/*
-    share/info/dir
-    share/man/whatis
-    share/mime/*
-    texlive/*
-  ].freeze
-
-  def self.list_unbrewed
-    dirs  = HOMEBREW_PREFIX.subdirs.map { |dir| dir.basename.to_s }
-    dirs -= %w[Library Cellar Caskroom .git]
-
-    # Exclude cache, logs, and repository, if they are located under the prefix.
-    [HOMEBREW_CACHE, HOMEBREW_LOGS, HOMEBREW_REPOSITORY].each do |dir|
-      dirs.delete dir.relative_path_from(HOMEBREW_PREFIX).to_s
-    end
-    dirs.delete "etc"
-    dirs.delete "var"
-
-    arguments = dirs.sort + %w[-type f (]
-    arguments.concat UNBREWED_EXCLUDE_FILES.flat_map { |f| %W[! -name #{f}] }
-    arguments.concat UNBREWED_EXCLUDE_PATHS.flat_map { |d| %W[! -path #{d}] }
-    arguments.push ")"
-
-    cd(HOMEBREW_PREFIX) { safe_system("find", *arguments) }
-  end
 end

Library/Homebrew/test/cmd/--prefix_spec.rb

@@ -1,8 +1,9 @@
 # frozen_string_literal: true
 
+require "cmd/--prefix"
 require "cmd/shared_examples/args_parse"
 
-RSpec.describe "brew --prefix" do
+RSpec.describe Homebrew::Cmd::Prefix do
   it_behaves_like "parseable arguments"
 
   it "prints Homebrew's prefix", :integration_test do