Formulary.from_rack: better formula resolution strategy

The flow is as follow:
* If tap is nil(DIY install), search using name.
* If tap is found, search using full name.
* If tap is found and full name searching failed, search using name.
  This usually means the formula may be migrated to different tap.

Closes Homebrew/homebrew#44771.

Signed-off-by: Xu Cheng <xucheng@me.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 2bdaca752..7577edb9e 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -217,10 +217,15 @@ class Formulary
     tap = tab.tap
     spec ||= tab.spec
 
-    if tap.nil? || tap == "Homebrew/homebrew"
+    if tap.nil?
       factory(rack.basename.to_s, spec)
     else
-      factory("#{tap.sub("homebrew-", "")}/#{rack.basename}", spec)
+      begin
+        factory("#{tap}/#{rack.basename}", spec)
+      rescue FormulaUnavailableError
+        # formula may be migrated to different tap. Try to search in core and all taps.
+        factory(rack.basename.to_s, spec)
+      end
     end
   end