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Feature #5129

Create a core class "FileArray" and make "ARGF" its instance

Added by yimutang (Joey Zhou) over 7 years ago. Updated 10 months ago.

Status:
Assigned
Priority:
Normal
Target version:
-
[ruby-core:38644]

Description

I suggest to create a class "FileArray" whose instance behaves just like ARGF do.
And I think ARGF should be an instance of FileArray. Now when I "p ARGF.class", I get "ARGF.class", so ARGF is an instance of ARGF.class, how meaningless it is.

FileArray methods:

# create an instance
fa = FileArray.new('a.txt','b.txt','c.txt')

# take many methods from IO
# most methods from ARGF should be instance methods of ARGF 
fa.each {|line| puts line }
fa.realines
fa.filename # current file

# but "argv" not
p fa.file_list # in ARGF, its ARGF.argv, but #argv is not a proper name for FileArray

# ARGV array can be modified, adding new file into it, all replace to a new file list.
# FileArray should add some methods to modify the inner file list.
fa.insert(3,"d.txt")
fa.delete('a.txt')

With FileArray, You can create multiple ARGF-like file arrays simultaneously.

For example, I want to mix two groups of files, not two files:

a_files = FileArray.new(*Dir.glob('a*.txt'))
b_files = FileArray.new(*Dir.glob('b*.txt'))

enum_a = a_files.each
enum_b = b_files.each

loop do
 puts enum_a.next
 puts enum_b.next
end

History

#1 [ruby-core:43698] Updated by mame (Yusuke Endoh) over 6 years ago

  • Status changed from Open to Assigned
  • Assignee set to matz (Yukihiro Matsumoto)

Hello,

I like the idea, but it requires matz's approval.

Now when I "p ARGF.class", I get "ARGF.class", so ARGF is an instance of ARGF.class, how meaningless it is.

FYI: In fact, it is meaningful. You can "exploit" it.

$ cat a.txt
foo
$ cat b.txt
bar
$ ruby -e 'p ARGF.class.new("a.txt", "b.txt").read'
"foo\nbar\n"

I'm not sure if this behavior is the spec, though.

--
Yusuke Endoh mame@tsg.ne.jp

#2 Updated by mame (Yusuke Endoh) almost 6 years ago

  • Target version set to 2.6

#3 Updated by naruse (Yui NARUSE) 11 months ago

  • Target version deleted (2.6)

#4 [ruby-core:84986] Updated by shevegen (Robert A. Heiler) 10 months ago

Just noticed it for the upcoming developer meeting. I agree with the
functionality; not sure if FileArray is a good name, but I also can
not suggest a better name. (The functionality is fine in my opinion)

#5 [ruby-core:84993] Updated by nobu (Nobuyoshi Nakada) 10 months ago

  • Description updated (diff)

yimutang (Joey Zhou) wrote:

For example, I want to mix two groups of files, not two files:

FileGroup ?

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