merge revision(s) 61149,61150,61151,61167: [Backport #14162]

	irb.rb: preserve ARGV on binding.irb

	This is not perfectly good solution (at least we don't want to have ARGV
	as default value of `argv` argument), but unfortunately IRB.setup and
	IRB.parse_opts are public methods and we can't make breaking change to
	those methods.

	We may deprecate using them and then make them private in the future,
	but the removal should not be in Ruby 2.5. So I kept their interface for
	now.

	[Bug #14162] [close GH-1770]

	* properties.

	irb/init.rb: make sure ARGV refers to toplevel one

	irb/test_init.rb: add test to ensure $0

	is not changed.

	At first `ARGV.unshift('something')` was suggested for r61149,
	but it wasn't sufficient because it modifies $0.

	Not only to preserve ARGV, but also r61149 intends to preserve $0.
	This test prevents future breakage of the behavior.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@62185 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 16 insertions, 16 deletions

diff --git a/lib/irb.rb b/lib/irb.rb
index 676abe42cd..fb6102724d 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -709,7 +709,7 @@ end
 class Binding
   # :nodoc:
   def irb
-    IRB.setup(eval("__FILE__"))
+    IRB.setup(eval("__FILE__"), argv: [])
     IRB::Irb.new(IRB::WorkSpace.new(self)).run(IRB.conf)
   end
 end
diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index 1184db15ea..0ec780341a 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -13,10 +13,10 @@
 module IRB # :nodoc:
 
   # initialize config
-  def IRB.setup(ap_path)
+  def IRB.setup(ap_path, argv: ::ARGV)
     IRB.init_config(ap_path)
     IRB.init_error
-    IRB.parse_opts
+    IRB.parse_opts(argv: argv)
     IRB.run_config
     IRB.load_modules
 
@@ -122,9 +122,9 @@ module IRB # :nodoc:
   end
 
   # option analyzing
-  def IRB.parse_opts
+  def IRB.parse_opts(argv: ::ARGV)
     load_path = []
-    while opt = ARGV.shift
+    while opt = argv.shift
       case opt
       when "-f"
         @CONF[:RC] = false
@@ -136,7 +136,7 @@ module IRB # :nodoc:
       when "-w"
         $VERBOSE = true
       when /^-W(.+)?/
-        opt = $1 || ARGV.shift
+        opt = $1 || argv.shift
         case opt
         when "0"
           $VERBOSE = nil
@@ -146,19 +146,19 @@ module IRB # :nodoc:
           $VERBOSE = true
         end
       when /^-r(.+)?/
-        opt = $1 || ARGV.shift
+        opt = $1 || argv.shift
         @CONF[:LOAD_MODULES].push opt if opt
       when /^-I(.+)?/
-        opt = $1 || ARGV.shift
+        opt = $1 || argv.shift
         load_path.concat(opt.split(File::PATH_SEPARATOR)) if opt
       when '-U'
         set_encoding("UTF-8", "UTF-8")
       when /^-E(.+)?/, /^--encoding(?:=(.+))?/
-        opt = $1 || ARGV.shift
+        opt = $1 || argv.shift
         set_encoding(*opt.split(':', 2))
       when "--inspect"
-        if /^-/ !~ ARGV.first
-          @CONF[:INSPECT_MODE] = ARGV.shift
+        if /^-/ !~ argv.first
+          @CONF[:INSPECT_MODE] = argv.shift
         else
           @CONF[:INSPECT_MODE] = true
         end
@@ -177,7 +177,7 @@ module IRB # :nodoc:
       when "--noverbose"
         @CONF[:VERBOSE] = false
       when /^--prompt-mode(?:=(.+))?/, /^--prompt(?:=(.+))?/
-        opt = $1 || ARGV.shift
+        opt = $1 || argv.shift
         prompt_mode = opt.upcase.tr("-", "_").intern
         @CONF[:PROMPT_MODE] = prompt_mode
       when "--noprompt"
@@ -189,13 +189,13 @@ module IRB # :nodoc:
       when "--tracer"
         @CONF[:USE_TRACER] = true
       when /^--back-trace-limit(?:=(.+))?/
-        @CONF[:BACK_TRACE_LIMIT] = ($1 || ARGV.shift).to_i
+        @CONF[:BACK_TRACE_LIMIT] = ($1 || argv.shift).to_i
       when /^--context-mode(?:=(.+))?/
-        @CONF[:CONTEXT_MODE] = ($1 || ARGV.shift).to_i
+        @CONF[:CONTEXT_MODE] = ($1 || argv.shift).to_i
       when "--single-irb"
         @CONF[:SINGLE_IRB] = true
       when /^--irb_debug(?:=(.+))?/
-        @CONF[:DEBUG_LEVEL] = ($1 || ARGV.shift).to_i
+        @CONF[:DEBUG_LEVEL] = ($1 || argv.shift).to_i
       when "-v", "--version"
         print IRB.version, "\n"
         exit 0
@@ -204,7 +204,7 @@ module IRB # :nodoc:
         IRB.print_usage
         exit 0
       when "--"
-        if opt = ARGV.shift
+        if opt = argv.shift
           @CONF[:SCRIPT] = opt
           $0 = opt
         end