cli: add command alias (20)

README.md

@@ -29,7 +29,10 @@ that runs on your computer.
 
 ## Usage
 
-    Usage: twenty COMMAND [OPTIONS]
+The CLI is available as two identical executables: <br>
+`$ 20`, and `$ twenty`.
+
+    Usage: 20 COMMAND [OPTIONS]
 
     Commands:
       up             Start the twenty web server.

twenty-cli/bin/20

@@ -0,0 +1,2 @@
+#!/usr/bin/env ruby
+Process.wait spawn([File.join(__dir__, "twenty"), "20"], *ARGV)

twenty-cli/bin/twenty

@@ -24,7 +24,7 @@ when "console"
   wait spawn("console", *ARGV[1..])
   exit $?.exitstatus
 else
-  warn "Usage: twenty COMMAND [OPTIONS]\n\n" \
+  warn "Usage: 20 COMMAND [OPTIONS]\n\n" \
        "Commands:\n" \
        "  up             Start the twenty web server.\n" \
        "  down           Stop the twenty web server.\n" \

twenty-cli/twenty-cli.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.summary = "twenty: command-line interface"
   gem.description = gem.summary
-  gem.executables = "twenty"
+  gem.executables = ["twenty", "20"]
   gem.add_runtime_dependency "cmd.rb", "~> 0.2"
   gem.add_development_dependency "test-unit", "~> 3.5.7"
   gem.add_development_dependency "yard", "~> 0.9"

twenty-cli/twenty-cli.gemspec.erb

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.summary = "twenty: command-line interface"
   gem.description = gem.summary
-  gem.executables = "twenty"
+  gem.executables = ["twenty", "20"]
   gem.add_runtime_dependency "cmd.rb", "~> 0.2"
   gem.add_development_dependency "test-unit", "~> 3.5.7"
   gem.add_development_dependency "yard", "~> 0.9"