style: add two options

Library/Homebrew/dev-cmd/style.rb

@@ -29,6 +29,10 @@ module Homebrew
              description: "Include the RuboCop cop name for each violation in the output."
       switch "--reset-cache",
              description: "Reset the RuboCop cache."
+      switch "--formula", "--formulae",
+             description: "Treat all named arguments as formulae."
+      switch "--cask", "--casks",
+             description: "Treat all named arguments as casks."
       comma_array "--only-cops",
                   description: "Specify a comma-separated <cops> list to check for violations of only the "\
                                "listed RuboCop cops."
@@ -36,6 +40,7 @@ module Homebrew
                   description: "Specify a comma-separated <cops> list to skip checking for violations of the "\
                                "listed RuboCop cops."
 
+      conflicts "--formula", "--cask"
       conflicts "--only-cops", "--except-cops"
     end
   end
@@ -43,10 +48,13 @@ module Homebrew
   def style
     args = style_args.parse
 
+    only = :formula if args.formula? && !args.cask?
+    only = :cask if args.cask? && !args.formula?
+
     target = if args.no_named?
       nil
     else
-      args.named.to_paths
+      args.named.to_paths(only: only)
     end
 
     only_cops = args.only_cops

docs/Manpage.md

@@ -1233,6 +1233,10 @@ including core code and all formulae.
   Include the RuboCop cop name for each violation in the output.
 * `--reset-cache`:
   Reset the RuboCop cache.
+* `--formula`:
+  Treat all named arguments as formulae.
+* `--cask`:
+  Treat all named arguments as casks.
 * `--only-cops`:
   Specify a comma-separated *`cops`* list to check for violations of only the listed RuboCop cops.
 * `--except-cops`:

manpages/brew.1

@@ -1708,6 +1708,14 @@ Include the RuboCop cop name for each violation in the output\.
 Reset the RuboCop cache\.
 .
 .TP
+\fB\-\-formula\fR
+Treat all named arguments as formulae\.
+.
+.TP
+\fB\-\-cask\fR
+Treat all named arguments as casks\.
+.
+.TP
 \fB\-\-only\-cops\fR
 Specify a comma\-separated \fIcops\fR list to check for violations of only the listed RuboCop cops\.
 .