From: Peter Pk <peterk@...>
Date: 2009-01-10T08:52:30+09:00
Subject: Ruby Rake 'advanced' rule arguments

Just starting out with Rake and Ruby, and made a little rakefile
(below).

It does a simple dependency based file copy of source files to a "dist"
directory. I works fine, but I was wondering if there is a way to
retrieve the "regex" argument to Rake::rule in the proc that generates
or modifies the "task_name". If so I wouldn't have to add a variable
(testregex in rakefile) in the scope that calls "rule".  Or maybe a way
to access $' $` and $& from the regex test that matches the rule's
target (task_name)

If this is better posted to another list let me know ;^>

PK

# **** rakefile ****
task :default => [:test]

LIBSRCDIR = '../../common'

# I didn't see this in the "FileList"
def addprefix(prefix,files)
  a = FileList.new() # can one allocate to files.size?
  files.each_index { |i|
    a[i] = prefix + files[i];
  }
  return(a)
end

# gotta do what ya gotta do
def regexifyPath(str)
  return(str.gsub(/\//,'\/').
            gsub(/\./,'\.'))
end

# copy in source for AiroNetSampleLib.dll

NETLIBSRC = [
  'HTTPClient.cpp',
  'HTTPInputStream.cpp',
  'HTTPChunkedOutputStream.cpp',
  'HTTPClientImpl.h',
]

NETLIBDIR = './NetSampleLib'
directory NETLIBDIR

NETLIBSRC_FULL = addprefix(NETLIBDIR + '/', NETLIBSRC)

testregex = Regexp.new('^' + regexifyPath(NETLIBDIR + '/'))

rule( testregex => [
    proc { |task_name| task_name.sub(testregex, LIBSRCDIR + '/aironet/')
}
  ])  do |t|
    puts "cp #{t.source} #{t.name}"
    cp t.source, t.name
end

task :test => NETLIBSRC_FULL do |t|
    puts "building #{t.name}"
    puts "from #{t.prerequisites}"
end
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