Puts to stream?

[Terry Michaels]

I've got simple statements like so:

puts "hi"
puts "there"
puts name

Wanted to adjust it to write to IO object (a string) instead of stdout.
This is the kind of construction I'd like to use:

my_out = String.new
puts my_out "hi"
puts my_out "there"
puts my_out name

But apparently that doesn't work. This seems to work

my_out << "hi" << "\n"
my_out << "there" << "\n"
my_out << name << "\n"

The lame part of that, though, is that it does not do the whole "check
if there is an end-line and add one if there isn't" magic, so I have to
manually specify the newline if I want one. I tried

my_out.puts "hi"

But evidently that does the exact opposite of want I want.

 

[Quintus]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Am 03.10.2010 20:54, schrieb Terry Michaels:

I've got simple statements like so:

puts "hi"
puts "there"
puts name

Wanted to adjust it to write to IO object (a string) instead of stdout.
This is the kind of construction I'd like to use:

my_out = String.new
puts my_out "hi"
puts my_out "there"
puts my_out name

But apparently that doesn't work. This seems to work

my_out << "hi" << "\n"
my_out << "there" << "\n"
my_out << name << "\n"

The lame part of that, though, is that it does not do the whole "check
if there is an end-line and add one if there isn't" magic, so I have to
manually specify the newline if I want one. I tried

my_out.puts "hi"

But evidently that does the exact opposite of want I want.

Maybe use a StringIO?

- -------------------------------
require "stringio"

str = StringIO.new("")
str.puts("hi")
str.puts("there")

puts str.string #=> "hi\nthere\n"
- -------------------------------

Vale,
Marvin
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[Quintus]

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Am 03.10.2010 21:12, schrieb Quintus:

puts str.string #=> "hi\nthere\n"

Sorry, this was meant to be

p str.string #=> "hi\nthere\n"

Vale,
Marvin
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[Rob Biedenharn]

I've got simple statements like so:

puts "hi"
puts "there"
puts name

Wanted to adjust it to write to IO object (a string) instead of
stdout.
This is the kind of construction I'd like to use:

my_out = String.new
puts my_out "hi"
puts my_out "there"
puts my_out name

But apparently that doesn't work. This seems to work

my_out << "hi" << "\n"
my_out << "there" << "\n"
my_out << name << "\n"

The lame part of that, though, is that it does not do the whole "check
if there is an end-line and add one if there isn't" magic, so I have
to
manually specify the newline if I want one. I tried

my_out.puts "hi"

But evidently that does the exact opposite of want I want.

In addition to Quintus, here's a bit more depending on how far you're
looking to go:

irb> puts "hi"
hi
=> nil
irb> require 'stringio'
=> true
irb> my_out = StringIO.new('')
=> #<StringIO:0x1e5d20>
irb> my_out.puts "hi"
=> nil
irb> my_out.string
=> "hi\n"

So you can explicitly use puts on the StringIO instance.

If you want to implicitly target your StringIO, you can:

irb> begin
?> saved_stdout = $stdout
irb> $stdout = my_out
irb> puts "there"
irb> ensure
?> $stdout = saved_stdout
irb> end
=> nil
irb> my_out.string
=> "hi\nthere\n"

Note that the ensure block puts $stdout back to where it started.

-Rob

Rob Biedenharn
(e-mail address removed) http://AgileConsultingLLC.com/
(e-mail address removed) http://GaslightSoftware.com/