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Feature #10395

Updated by nobu (Nobuyoshi Nakada) almost 5 years ago

This would make erb more useful from the command line. Granted the use of Binding#eval is dangerous so one has to be careful. Newer versions of Ruby have Binding#local_variable_set which can be used instead but this works with Ruby 2.0.0.



~~~
jonagold:local jos$ cat /tmp/erb-template
This is <%= foo %>
And this is <%= bar %>
~~~
~~~diff
jonagold:local jos$ diff -u /usr/bin/erb /tmp/erb
--- /usr/bin/erb 2014-05-15 22:14:36.000000000 -0700
+++ /tmp/erb 2014-10-16 22:29:37.000000000 -0700
@@ -114,6 +114,13 @@
exit 1
end

+ vars = ARGV.take_while {|arg| arg[/^\w+=/]}
+ ARGV.slice!(0, vars.size)
+ vars.each do |var|
+ k, v = var.split('=', 2)
+ TOPLEVEL_BINDING.eval %Q(#{k} = "#{v}")
+ end
+
$<.set_encoding(Encoding::ASCII_8BIT, nil)
src = $<.read
filename = $FILENAME
~~~
~~~

jonagold:local jos$ /tmp/erb foo=FOO bar=123 /tmp/erb-template
This is FOO
And this is 123
jonagold:local jos$
~~~

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