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require 'download_strategy'
# Defines a URL and download method for a stable or HEAD build
class SoftwareSpecification
attr_reader :url, :specs, :using
VCS_SYMBOLS = {
:bzr => BazaarDownloadStrategy,
:curl => CurlDownloadStrategy,
:cvs => CVSDownloadStrategy,
:git => GitDownloadStrategy,
:hg => MercurialDownloadStrategy,
:nounzip => NoUnzipCurlDownloadStrategy,
:post => CurlPostDownloadStrategy,
:svn => SubversionDownloadStrategy,
}
def initialize url, specs=nil
raise "No url provided" if url.nil?
@url = url
if specs.nil?
@using = nil
else
# Get download strategy hint, if any
@using = specs.delete :using
# The rest of the specs are for source control
@specs = specs
end
end
# Returns a suitable DownloadStrategy class that can be
# used to retreive this software package.
def download_strategy
return detect_download_strategy(@url) if @using.nil?
# If a class is passed, assume it is a download strategy
return @using if @using.kind_of? Class
detected = VCS_SYMBOLS[@using]
raise "Unknown strategy #{@using} was requested." unless detected
return detected
end
def detect_version
Pathname.new(@url).version
end
end
# Used to annotate formulae that duplicate OS X provided software
# or cause conflicts when linked in.
class KegOnlyReason
attr_reader :reason, :explanation
def initialize reason, explanation=nil
@reason = reason
@explanation = explanation
end
def to_s
if @reason == :provided_by_osx
<<-EOS.strip
Mac OS X already provides this program and installing another version in
parallel can cause all kinds of trouble.
#{@explanation}
EOS
else
@reason.strip
end
end
end
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