cmd: add raises for invalid input

Library/Homebrew/cmd/info.rb

@@ -78,9 +78,12 @@ module Homebrew
 
     if args.json
       raise UsageError, "Invalid JSON version: #{args.json}" unless ["v1", true].include? args.json
+      raise UsageError, "This command's option requires a formula argument" if ARGV.named.empty?
 
       print_json
     elsif args.github?
+      raise UsageError, "This command's option requires a formula argument" if ARGV.named.empty?
+
       exec_browser(*Homebrew.args.formulae.map { |f| github_info(f) })
     else
       print_info

Library/Homebrew/cmd/postinstall.rb

@@ -23,6 +23,8 @@ module Homebrew
   def postinstall
     postinstall_args.parse
 
+    raise KegUnspecifiedError if args.remaining.empty?
+
     ARGV.resolved_formulae.each do |f|
       ohai "Postinstalling #{f}"
       fi = FormulaInstaller.new(f)

Library/Homebrew/cmd/reinstall.rb

@@ -47,6 +47,8 @@ module Homebrew
   def reinstall
     reinstall_args.parse
 
+    raise FormulaUnspecifiedError if args.remaining.empty?
+
     FormulaInstaller.prevent_build_flags unless DevelopmentTools.installed?
 
     Install.perform_preinstall_checks

Library/Homebrew/cmd/switch.rb

@@ -14,46 +14,32 @@ module Homebrew
 
         Symlink all of the specified <version> of <formula>'s installation into Homebrew's prefix.
       EOS
-      switch_option :verbose
-      switch_option :debug
+      switch :verbose
+      switch :debug
     end
   end
 
   def switch
     switch_args.parse
-    name = args.remaining.first
-
-    usage = "Usage: brew switch <formula> <version>"
 
-    unless name
-      onoe usage
-      exit 1
-    end
+    raise FormulaUnspecifiedError if args.remaining.empty?
 
+    name = args.remaining.first
     rack = Formulary.to_rack(name)
 
-    unless rack.directory?
-      onoe "#{name} not found in the Cellar."
-      exit 2
-    end
+    odie "#{name} not found in the Cellar." unless rack.directory?
 
     versions = rack.subdirs
                    .map { |d| Keg.new(d).version }
                    .sort
                    .join(", ")
     version = args.remaining.second
+    raise UsageError, "Specify one of #{name}'s installed versions: #{versions}" unless version
 
-    if !version || args.remaining.length > 2
-      onoe usage
-      puts "#{name} installed versions: #{versions}"
-      exit 1
-    end
-
-    unless (rack/version).directory?
-      onoe "#{name} does not have a version \"#{version}\" in the Cellar."
-      puts "#{name} installed versions: #{versions}"
-      exit 3
-    end
+    odie <<~EOS unless (rack/version).directory?
+      #{name} does not have a version \"#{version}\" in the Cellar.
+      #{name}'s installed versions: #{versions}
+    EOS
 
     # Unlink all existing versions
     rack.subdirs.each do |v|

Library/Homebrew/dev-cmd/bottle.rb

@@ -86,6 +86,7 @@ module Homebrew
     bottle_args.parse
 
     return merge if args.merge?
+    raise KegUnspecifiedError if args.remaining.empty?
 
     ensure_relocation_formulae_installed! unless args.skip_relocation?
     ARGV.resolved_formulae.each do |f|
@@ -426,6 +427,7 @@ module Homebrew
 
   def merge
     write = args.write?
+    raise UsageError, "--merge requires a JSON file path argument" if ARGV.named.empty?
 
     bottles_hash = ARGV.named.reduce({}) do |hash, json_file|
       hash.deep_merge(JSON.parse(IO.read(json_file)))