move CoreFormulaRepository into separate file

For users whose local brew is at around 2015-06-11 to 2015-08-06,
running `brew update` will emit following error:

  Error: uninitialized constant Formulary::CoreFormulaRepository

This is caused by the same bug described in Homebrew/homebrew#42553.

This commit workarounds this issue and restores `brew update` compatibility
for users mentioned above.

Also cleanup legacy `require "cmd/tap"`.

5 files changed, 9 insertions, 4 deletions

diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index 4eb6f1660..dbd8f5c04 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -1,8 +1,9 @@
 require "blacklist"
 require "cmd/doctor"
 require "cmd/search"
-require "cmd/tap"
 require "formula_installer"
+require "tap"
+require "core_formula_repository"
 require "hardware"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/pull.rb b/Library/Homebrew/cmd/pull.rb
index bcfcb7d11..1454f9938 100644
--- a/Library/Homebrew/cmd/pull.rb
+++ b/Library/Homebrew/cmd/pull.rb
@@ -3,7 +3,8 @@
 
 require "utils"
 require "formula"
-require "cmd/tap"
+require "tap"
+require "core_formula_repository"
 
 module Homebrew
   def pull_url(url)
diff --git a/Library/Homebrew/cmd/readall.rb b/Library/Homebrew/cmd/readall.rb
index 4d74a6f41..7775c2923 100644
--- a/Library/Homebrew/cmd/readall.rb
+++ b/Library/Homebrew/cmd/readall.rb
@@ -4,7 +4,8 @@
 # or to determine if any current formulae have Ruby issues
 
 require "formula"
-require "cmd/tap"
+require "tap"
+require "core_formula_repository"
 require "thread"
 
 module Homebrew
diff --git a/Library/Homebrew/cmd/tap.rb b/Library/Homebrew/cmd/tap.rb
index a7fd3f500..5c1ff089c 100644
--- a/Library/Homebrew/cmd/tap.rb
+++ b/Library/Homebrew/cmd/tap.rb
@@ -1,4 +1,5 @@
 require "tap"
+require "core_formula_repository"
 
 module Homebrew
   def tap
diff --git a/Library/Homebrew/cmd/test-bot.rb b/Library/Homebrew/cmd/test-bot.rb
index b6b167f3f..b297c71d8 100644
--- a/Library/Homebrew/cmd/test-bot.rb
+++ b/Library/Homebrew/cmd/test-bot.rb
@@ -29,7 +29,8 @@ require "date"
 require "rexml/document"
 require "rexml/xmldecl"
 require "rexml/cdata"
-require "cmd/tap"
+require "tap"
+require "core_formula_repository"
 
 module Homebrew
   BYTES_IN_1_MEGABYTE = 1024*1024