From: Xan Xann <dxpublica@...>
Date: 2006-09-12T20:16:43+09:00
Subject: Re: word substitution in file

Eero Saynatkari wrote:
> Paul Lutus wrote:
>> #!/usr/bin/ruby
>> 
>> def substitute(source,dest,find,replace)
>>   data = File.read(source)
>>   result = data.gsub(/#{find}/,replace)
>>   File.open(dest,"w") { |f| f.write(result) } if data != result
>> end
> 
> The equality test there is probably unnecessary.
> What you could do for a bit lower a cost, if you
> really want to avoid the possible write overhead:
> 
> # Untested too
> require 'fileutils'
> 
> def FileUtils.s(source, dest, subs = {})
>   data = File.read source
>   search = /#{subs.keys.map {|k| Regexp.escape k}.join '|'}/
>   result = data.gsub(search) {|found| subs[found]}
>   File.open(dest, 'w') {|f| f.write result} if $&  # Regex matched
> end
> 
> FileUtils.s 'src.txt', 'dest.txt', 'foo' => 'bar'


This WORKS!!!! finally


Thank you very much
It seems it supports regexp expressions. Is it true?

Xan.

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