cmd, dev-cmd: use args.formulae_paths.

This makes these commands robust to invalid syntax.

Library/Homebrew/cmd/cat.rb

@@ -25,6 +25,6 @@ module Homebrew
     else
       "cat"
     end
-    safe_system pager, args.formulae.first.path, *args.passthrough
+    safe_system pager, args.formulae_paths.first, *args.passthrough
   end
 end

Library/Homebrew/cmd/style.rb

@@ -45,7 +45,7 @@ module Homebrew
     elsif args.named.any? { |tap| tap.count("/") == 1 }
       args.named.map { |tap| Tap.fetch(tap).path }
     else
-      args.formulae.map(&:path)
+      args.formulae_paths
     end
 
     only_cops = args.only_cops

Library/Homebrew/dev-cmd/audit.rb

@@ -84,7 +84,7 @@ module Homebrew
       files = Tap.map(&:formula_dir)
     else
       ff = args.resolved_formulae
-      files = args.resolved_formulae.map(&:path)
+      files = args.formulae_paths
     end
 
     only_cops = args.only_cops

Library/Homebrew/dev-cmd/edit.rb

@@ -14,7 +14,6 @@ module Homebrew
         Open <formula> in the editor set by `EDITOR` or `HOMEBREW_EDITOR`, or open the
         Homebrew repository for editing if no formula is provided.
       EOS
-      switch :force
       switch :verbose
       switch :debug
     end
@@ -31,16 +30,10 @@ module Homebrew
       EOS
     end
 
+    paths = args.formulae_paths.presence
+
     # If no brews are listed, open the project root in an editor.
-    paths = [HOMEBREW_REPOSITORY] if args.no_named?
+    paths ||= [HOMEBREW_REPOSITORY]
-
-    # Don't use args.formulae as that will throw if the file doesn't parse
-    paths ||= args.named.map do |name|
-      path = Formulary.path(name)
-      raise FormulaUnavailableError, name if !path.file? && !args.force?
-
-      path
-    end
 
     exec_editor(*paths)
   end

Library/Homebrew/dev-cmd/formula.rb

@@ -22,6 +22,6 @@ module Homebrew
   def formula
     formula_args.parse
 
-    args.resolved_formulae.each { |f| puts f.path }
+    args.formulae_paths.each(&method(:puts))
   end
 end