'brew man': abort if a formula is given

Closes Homebrew/homebrew#40735.

Closes Homebrew/homebrew#40736.

Signed-off-by: Baptiste Fontaine <batifon@yahoo.fr>

Library/Homebrew/cmd/man.rb

@@ -6,32 +6,30 @@ module Homebrew
   LINKED_PATH=HOMEBREW_PREFIX/"share/man/man1"
 
   def man
-    if ARGV.include?("--link") || ARGV.include?("-l")
+    abort <<-EOS.undent unless ARGV.named.empty?
+      This command updates the brew manpage and does not take formula names.
+    EOS
+
+    if ARGV.flag? "--link"
+      abort <<-EOS.undent if TARGET_PATH == LINKED_PATH
+        The target path is the same as the linked one, aborting.
+      EOS
       Dir["#{TARGET_PATH}/*.1"].each do |page|
         FileUtils.ln_s page, LINKED_PATH
         return
       end
-    end
+    else
+      Homebrew.install_gem_setup_path! "ronn"
 
-    Homebrew.install_gem_setup_path! "ronn"
-
-    if ARGV.include?("--server") || ARGV.include?("-s")
-      puts "Man page test server: http://localhost:1207/"
-      puts "Control-C to exit."
-      system "ronn", "--server", Dir["#{SOURCE_PATH}/*"]
-      return
-    end
+      puts "Writing manpages to #{TARGET_PATH}"
 
-    puts "Writing manpages to #{TARGET_PATH}"
-
-    target_file = nil
-    Dir["#{SOURCE_PATH}/*.md"].each do |source_file|
-      target_file = TARGET_PATH/File.basename(source_file, ".md")
-      safe_system "ronn --roff --pipe --organization='Homebrew' --manual='brew' #{source_file} > #{target_file}"
-    end
+      target_file = nil
+      Dir["#{SOURCE_PATH}/*.md"].each do |source_file|
+        target_file = TARGET_PATH/File.basename(source_file, ".md")
+        safe_system "ronn --roff --pipe --organization='Homebrew' --manual='brew' #{source_file} > #{target_file}"
+      end
 
-    if ARGV.include?("--verbose") || ARGV.include?("-v")
-      system "man", target_file
+      system "man", target_file if ARGV.flag? "--verbose"
     end
   end
 end