update: implement rename_taps_dir_if_necessary in bash

rename_taps_dir_if_necessary must be performed before actual update.
Otherwise, it will report that `HOMEBREW_UPDAET_BEFORE<REPO_VAR>` is
unset.

Library/Homebrew/cmd/update-bash.sh

@@ -44,6 +44,36 @@ git_init_if_necessary() {
   fi
 }
 
+rename_taps_dir_if_necessary() {
+  local tap_dir
+  for tap_dir in "$HOMEBREW_LIBRARY"/Taps/*
+  do
+    [[ -d "$tap_dir/.git" ]] || continue
+    local tap_dir_basename
+    tap_dir_basename="${tap_dir##*/}"
+    if [[ "$tap_dir_basename" = *"-"* ]]
+    then
+      # only replace the *last* dash: yes, tap filenames suck
+      local user
+      local repo
+      user="$(echo "${tap_dir_basename%-*}" | tr "[:upper:]" "[:lower:]")"
+      repo="$(echo "${tap_dir_basename:${#user}+1}" | tr "[:upper:]" "[:lower:]")"
+      mkdir -p "$HOMEBREW_LIBRARY/Taps/$user"
+      mv "$tap_dir", "$HOMEBREW_LIBRARY/Taps/$user/homebrew-$repo"
+
+      if [[ ${#${tap_dir_basename//[^\-]}} -gt 1 ]]
+      then
+        echo "Homebrew changed the structure of Taps like <someuser>/<sometap>." >&2
+        echo "So you may need to rename $HOMEBREW_LIBRARY/Taps/$user/homebrew-$repo manually." >&2
+      fi
+    else
+      echo "Homebrew changed the structure of Taps like <someuser>/<sometap>. " >&2
+      echo "$tap_dir is an incorrect Tap path." >&2
+      echo "So you may need to rename it to $HOMEBREW_LIBRARY/Taps/<someuser>/homebrew-<sometap> manually." >&2
+    fi
+  done
+}
+
 repo_var() {
   local repo_var="$1"
   if [[ "$repo_var" = "$HOMEBREW_REPOSITORY" ]]
@@ -247,6 +277,9 @@ EOS
 
   chdir "$HOMEBREW_REPOSITORY"
   git_init_if_necessary
+  # rename Taps directories
+  # this procedure will be removed in the future if it seems unnecessary
+  rename_taps_dir_if_necessary
 
   for DIR in "$HOMEBREW_REPOSITORY" "$HOMEBREW_LIBRARY"/Taps/*/*
   do

Library/Homebrew/cmd/update-report.rb

@@ -23,10 +23,6 @@ module Homebrew
     end
     report.update(master_updater.report)
 
-    # rename Taps directories
-    # this procedure will be removed in the future if it seems unnecessasry
-    rename_taps_dir_if_necessary
-
     updated_taps = []
     Tap.each do |tap|
       next unless tap.git?
@@ -106,34 +102,6 @@ module Homebrew
     `git rev-parse --short #{revision}`.chomp
   end
 
-  def rename_taps_dir_if_necessary
-    Dir.glob("#{HOMEBREW_LIBRARY}/Taps/*/") do |tapd|
-      begin
-        if File.directory?(tapd + "/.git")
-          tapd_basename = File.basename(tapd)
-          if tapd_basename.include?("-")
-            # only replace the *last* dash: yes, tap filenames suck
-            user, repo = tapd_basename.reverse.sub("-", "/").reverse.split("/")
-
-            FileUtils.mkdir_p("#{HOMEBREW_LIBRARY}/Taps/#{user.downcase}")
-            FileUtils.mv(tapd, "#{HOMEBREW_LIBRARY}/Taps/#{user.downcase}/homebrew-#{repo.downcase}")
-
-            if tapd_basename.count("-") >= 2
-              opoo "Homebrew changed the structure of Taps like <someuser>/<sometap>. "\
-                + "So you may need to rename #{HOMEBREW_LIBRARY}/Taps/#{user.downcase}/homebrew-#{repo.downcase} manually."
-            end
-          else
-            opoo "Homebrew changed the structure of Taps like <someuser>/<sometap>. "\
-              "#{tapd} is incorrect name format. You may need to rename it like <someuser>/<sometap> manually."
-          end
-        end
-      rescue => ex
-        onoe ex.message
-        next # next tap directory
-      end
-    end
-  end
-
   def load_tap_migrations
     load "tap_migrations.rb"
   rescue LoadError