Update commit when resolving the formula (#536)

Library/Homebrew/extend/ARGV.rb

@@ -32,6 +32,10 @@ module HomebrewArgvExtension
           resolved_spec = spec(nil) || tab.spec
           f.set_active_spec(resolved_spec) if f.send(resolved_spec)
           f.build = tab
+          if f.head? && tab.tabfile
+            k = Keg.new(tab.tabfile.parent)
+            f.version.update_commit(k.version.version.commit)
+          end
         end
         f
       else

Library/Homebrew/formulary.rb

@@ -246,6 +246,7 @@ class Formulary
       end
     end
     f.build = tab
+    f.version.update_commit(keg.version.version.commit) if f.head?
     f
   end
 

Library/Homebrew/postinstall.rb

@@ -11,7 +11,7 @@ begin
 
   trap("INT", old_trap)
 
-  formula = ARGV.formulae.first
+  formula = ARGV.resolved_formulae.first
   formula.extend(Debrew::Formula) if ARGV.debug?
   formula.run_post_install
 rescue Exception => e

Library/Homebrew/test.rb

@@ -19,7 +19,7 @@ begin
 
   trap("INT", old_trap)
 
-  formula = ARGV.formulae.first
+  formula = ARGV.resolved_formulae.first
   formula.extend(Homebrew::Assertions)
   formula.extend(Debrew::Formula) if ARGV.debug?