Equivalent of "source" in ruby?

Todd A. Jacobs · Sep 7, 2007

Contrary to my expectations, if I have some variable assignments in an
external file, I can't simply call:

load rcfile

to have it sourced. Instead, I found myself having to do this:

IO.foreach(rcfile) do |line|
eval line
end

which seems lame. Is there a better way?

Alex Gutteridge · Sep 7, 2007

Contrary to my expectations, if I have some variable assignments in an
external file, I can't simply call:

load rcfile

to have it sourced. Instead, I found myself having to do this:

IO.foreach(rcfile) do |line|
eval line
end

which seems lame. Is there a better way?

Would globals work for you?

[alexg@powerbook]/Users/alexg/Desktop(28): cat load_me.rb
$global=10
local=20
[alexg@powerbook]/Users/alexg/Desktop(29): cat main.rb
load 'load_me.rb'

puts $global
puts local
[alexg@powerbook]/Users/alexg/Desktop(30): ruby main.rb
10
main.rb:4: undefined local variable or method `local' for main:Object
(NameError)

Alex Gutteridge

Bioinformatics Center
Kyoto University

Michael T. Richter · Sep 7, 2007

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Contrary to my expectations, if I have some variable assignments in an
external file, I can't simply call:
=20
load rcfile
=20
to have it sourced. Instead, I found myself having to do this:
=20
IO.foreach(rcfile) do |line|
eval line
end
=20
which seems lame. Is there a better way?

#test1.rb:

@a =3D 5
@b =3D 4
=20
require 'test2'
=20
p @a
p @b
p @c

#----8<-----

#test2.rb:

@b =3D 3
@c =3D 2

$ ruby test1.rb
5
3
2
$

Or am I missing something?
--=20
Michael T. Richter <[email protected]> (GoogleTalk:
(e-mail address removed))
So much of what we call management consists in making it difficult for
people to work. (Peter Drucker)

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On Fri, 2007-07-09 at 14:17 +0900, Todd A. Jacobs wrote:
<BLOCKQUOTE TYPE=3DCITE>
<PRE>
Contrary to my expectations, if I have some variabl=
e assignments in an
external file, I can't simply call:

 load rcfile

to have it sourced. Instead, I found myself having =
to do this:

 IO.foreach(rcfile) do |line|
 eval line
 end

which seems lame. Is there a better way?
</PRE>
</BLOCKQUOTE>
<PRE>

</PRE>
#test1.rb: 
<BLOCKQUOTE>
<TT>@a =3D 5</TT> 
<TT>@b =3D 4</TT> 
 
<TT>require 'test2'</TT> 
 
<TT>p @a</TT> 
<TT>p @b</TT> 
<TT>p @c</TT> 
</BLOCKQUOTE>
#----8<----- 
 
#test2.rb: 
<BLOCKQUOTE>
<TT>@b =3D 3</TT> 
<TT>@c =3D 2</TT> 
</BLOCKQUOTE>
 
<TT>$ </TT><TT>ruby test1.rb</TT> 
<TT>5</TT> 
<TT>3</TT> 
<TT>2</TT> 
<TT>$</TT> 
 
Or am I missing something? 
<TABLE CELLSPACING=3D"0" CELLPADDING=3D"0" WIDTH=3D"100%">
<TR>
<TD>
-- 
Michael T. Richter <<A HREF=3D"mailto:[email protected]">ttmri=
(e-mail address removed)</A>> (GoogleTalk: (e-mail address removed)) 
So much of what we call management consists in making it difficult for p=
eople to work. (Peter Drucker)
</TD>
</TR>
</TABLE>
</BODY>
</HTML>

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Erik Veenstra · Sep 7, 2007

Contrary to my expectations, if I have some variable

assignments in an external file, I can't simply call:

load rcfile

Load starts a new scope without reusing the local scope. Eval
starts a new scope with reusing the local scope. So, use eval
instead. But you should "define" the vars before loading them.

gegroet,
Erik V. - http://www.erikveen.dds.nl/

----------------------------------------------------------------

$ cat test.rb
a=nil
b=nil

eval(File.read("vars.rb"))

# Or better: Thread.new{$SAFE=4 ; eval(File.read("vars.rb"),
Module.new.instance_eval{binding})}.join

p a
p b

----------------------------------------------------------------

$ cat vars.rb
a = 7
b = 8

----------------------------------------------------------------

$ ruby test.rb
7
8

----------------------------------------------------------------

Robert Klemme · Sep 7, 2007

2007/9/7 said:
On Fri, 2007-07-09 at 14:17 +0900, Todd A. Jacobs wrote:
Contrary to my expectations, if I have some variable assignments in an
external file, I can't simply call:

load rcfile

to have it sourced. Instead, I found myself having to do this:

IO.foreach(rcfile) do |line|
eval line
end

which seems lame. Is there a better way?

#test1.rb:

@a = 5
@b = 4

require 'test2'

p @a
p @b
p @c
#----8<-----

#test2.rb:

@b = 3
@c = 2

$ ruby test1.rb
5
3
2
$

Or am I missing something?

Yes, you are missing the local variable bit.

robert

Robert Klemme · Sep 7, 2007

2007/9/7 said:
Contrary to my expectations, if I have some variable assignments in an
external file, I can't simply call:

load rcfile

to have it sourced. Instead, I found myself having to do this:

IO.foreach(rcfile) do |line|
eval line
end

which seems lame. Is there a better way?

It is also unsafe - not only because of the eval but also because this
will give errors for expressions that span multiple lines. The easy
fix would be

eval(File.read(rc_file))

But I'd rather resort to one of the other suggestions (namely using
local variables).

Kind regards

robert

Erik Veenstra · Sep 7, 2007

a = nil
b = nil

Thread.new do
data = File.read("vars.rb")
$SAFE = 4
b = Module.new.instance_eval{binding}

eval(data, b)
end.join

p a
p b

Michael T. Richter · Sep 7, 2007

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Yes, you are missing the local variable bit.

That would do it.

--=20
Michael T. Richter <[email protected]> (GoogleTalk:
(e-mail address removed))
When debugging, novices insert corrective code; experts remove defective
code. (Richard Pattis)

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On Fri, 2007-07-09 at 19:53 +0900, Robert Klemme wrote:
<BLOCKQUOTE TYPE=3DCITE>
<PRE>
Yes, you are missing the local variable bit.

</F=
ONT>
</PRE>
</BLOCKQUOTE>
 
That would do it.  <IMG SRC=3D"cid:1189167647.23619.17.camel@localhost=
localdomain" ALIGN=3D"middle" ALT=3D"

" BORDER=3D"0"> 
 
<TABLE CELLSPACING=3D"0" CELLPADDING=3D"0" WIDTH=3D"100%">
<TR>
<TD>
-- 
Michael T. Richter <<A HREF=3D"mailto:[email protected]">ttmri=
(e-mail address removed)</A>> (GoogleTalk: (e-mail address removed)) 
When debugging, novices insert corrective code; experts remove defective=
code. (Richard Pattis)
</TD>
</TR>
</TABLE>
</BODY>
</HTML>

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Eric Hodel · Sep 10, 2007

a = nil
b = nil

Thread.new do
data = File.read("vars.rb")
$SAFE = 4
b = Module.new.instance_eval{binding}

eval(data, b)
end.join

p a
p b

echo "Thread.critical = true; sleep" >> vars.rb

Robert Klemme · Sep 10, 2007

2007/9/7 said:
It is also unsafe - not only because of the eval but also because this
will give errors for expressions that span multiple lines. The easy
fix would be

eval(File.read(rc_file))

But I'd rather resort to one of the other suggestions (namely using
local variables).

That was intended to read "global" of course. Sorry for the noise.

robert

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Equivalent of "source" in ruby?

Todd A. Jacobs

Alex Gutteridge

Michael T. Richter

Erik Veenstra

Robert Klemme

Robert Klemme

Erik Veenstra

Michael T. Richter

Eric Hodel

Robert Klemme

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