cmd/--repository: fix homebrew- prefix handling

Library/Homebrew/cmd/--repository.sh

@@ -25,7 +25,7 @@ tap_path() {
     fi
   done
 
-  repo="${repo#(home|linux)brew-}"
+  repo="${repo#@(home|linux)brew-}"
   echo "${HOMEBREW_LIBRARY}/Taps/${user}/homebrew-${repo}"
 }
 
@@ -38,8 +38,11 @@ homebrew---repository() {
     return
   fi
 
-  for tap in "$@"
-  do
-    tap_path "${tap}"
-  done
+  (
+    shopt -s extglob
+    for tap in "$@"
+    do
+      tap_path "${tap}"
+    done
+  )
 }

Library/Homebrew/test/cmd/--repository_spec.rb

@@ -14,4 +14,11 @@ RSpec.describe "brew --repository", type: :system do
       .and not_to_output.to_stderr
       .and be_a_success
   end
+
+  it "prints a Tap's repository correctly when homebrew- prefix is supplied", :integration_test do
+    expect { brew_sh "--repository", "foo/homebrew-bar" }
+      .to output("#{ENV.fetch("HOMEBREW_LIBRARY")}/Taps/foo/homebrew-bar\n").to_stdout
+      .and not_to_output.to_stderr
+      .and be_a_success
+  end
 end