Added --dry-run to unlink

Closes Homebrew/homebrew#43561.

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

1 files changed, 12 insertions, 1 deletions

diff --git a/Library/Homebrew/cmd/unlink.rb b/Library/Homebrew/cmd/unlink.rb
index 4833283ff..8779b2099 100644
--- a/Library/Homebrew/cmd/unlink.rb
+++ b/Library/Homebrew/cmd/unlink.rb
@@ -1,12 +1,23 @@
+require "ostruct"
+
 module Homebrew
   def unlink
     raise KegUnspecifiedError if ARGV.named.empty?
 
+    mode = OpenStruct.new
+    mode.dry_run = true if ARGV.dry_run?
+
     ARGV.kegs.each do |keg|
+      if mode.dry_run
+        puts "Would remove:"
+        keg.unlink(mode)
+        next
+      end
+
       keg.lock do
         print "Unlinking #{keg}... "
         puts if ARGV.verbose?
-        puts "#{keg.unlink} symlinks removed"
+        puts "#{keg.unlink(mode)} symlinks removed"
       end
     end
   end