update: only display version changed formulae

Closes Homebrew/homebrew#40090.

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

1 files changed, 13 insertions, 1 deletions

diff --git a/Library/Homebrew/cmd/update.rb b/Library/Homebrew/cmd/update.rb
index 99f84806e..c8e1dec54 100644
--- a/Library/Homebrew/cmd/update.rb
+++ b/Library/Homebrew/cmd/update.rb
@@ -164,8 +164,20 @@ class Updater
         next unless paths.any? { |p| File.dirname(p) == formula_directory }
 
         case status
-        when "A", "M", "D"
+        when "A", "D"
           map[status.to_sym] << repository.join(src)
+        when "M"
+          file = repository.join(src)
+          begin
+            require "formula_versions"
+            formula = Formulary.factory(file)
+            new_version = formula.pkg_version
+            old_version = FormulaVersions.new(formula).formula_at_revision(@initial_revision, &:pkg_version)
+            next if new_version == old_version
+          rescue LoadError, FormulaUnavailableError => e
+            onoe e if ARGV.homebrew_developer?
+          end
+          map[:M] << file
         when /^R\d{0,3}/
           map[:D] << repository.join(src) if File.dirname(src) == formula_directory
           map[:A] << repository.join(dst) if File.dirname(dst) == formula_directory