brew commands

Shows a list of built-in commands (but not shortcuts) and searches
for any external commands on the path.

Closes #22509.

1 files changed, 33 insertions, 0 deletions

diff --git a/Library/Homebrew/cmd/commands.rb b/Library/Homebrew/cmd/commands.rb
new file mode 100644
index 000000000..b9bbb12ec
--- /dev/null
+++ b/Library/Homebrew/cmd/commands.rb
@@ -0,0 +1,33 @@
+module Homebrew extend self
+  def paths
+    @paths ||= ENV['PATH'].split(File::PATH_SEPARATOR).collect do |p|
+      begin
+        File.expand_path(p).chomp('/')
+      rescue ArgumentError
+        onoe "The following PATH component is invalid: #{p}"
+      end
+    end.uniq.compact
+  end
+
+  def commands
+    # Find commands in Homebrew/cmd
+    cmds = (HOMEBREW_REPOSITORY/"Library/Homebrew/cmd").
+           children(with_directory=false).
+           map {|f| File.basename(f, '.rb')}
+    puts "Built-in commands"
+    puts_columns cmds
+
+    # Find commands in the path
+    exts =  paths.map{ |p| Dir["#{p}/*"] }.flatten.
+            map{    |f| File.basename f }.
+            select{ |f| f =~ /^brew-(.+)/ }.
+            map{    |f| File.basename(f, '.rb')[5..-1] }.
+            reject{ |f| f =~ /\./ }
+
+    unless exts.empty?
+      puts
+      puts "External commands"
+      puts_columns exts
+    end
+  end
+end