Is There a Way to Know Full Dependencies?

[Simon Ruderich]

Xin Liu wrote:
> Hi,
> 
> I'm just wondering, is there an easy way to know the full dependencies
> for installing a package? For instance, gnuplot depends on tetex, and
> tetex further depends on texinfo, then is it possible for me to know
> that gnuplot indirectly depends on texinfo before the actual
> downloading and compiling start? I ask this because I want to easily
> find out the full dependencies of installing a package before
> installing anything, so that if I don't like a particular dependency,
> I can edit the portfile to bypass it.
> 
> Best
> Regards,
> 
> Xin Liu

Hi,

sorry for the late reply, but I didn't came across this problem until now.

I don't know of any direct way within macports but I created a small
ruby script which does what you want. I'm not sure if it uses a very
good way, because it's a bit slow, but it works for me.

Just use "./alldeps.rb <your portname here>" with it and it should give
you all decencies.
I attached it to this mail.

But it would be really nice if this could be integrated in macports (or
if it's already there, said to me :-) )

Hope this helps,
Simon
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#!/usr/bin/env ruby

puts "Usage: ./alldeps.rb <port name>" if ARGV[0].nil?

# gets all dependencies:
def port_deps( port )
  # get the dependencies of this port:
  result = `port deps "#{port}" 2>&1`
  
  # abort with false if the port couldn't be found:
  ( puts result; exit ) if result =~ /Error: No port .+ found\./
  
  # return an empty array if the port doesn't have any dependencies:
  return [] if result =~ /.+ has no dependencies/
  
  # array to store the dependencies:
  deps = []
  # add each dependency of this port:
  result.each do |line|
    deps << line.strip if line =~ /^\s+\S+/
  end
  
  # add the dependencies of each dependency to deps to get all:
  deps.each do |dep|
    # add the dependency only if it doesn't exist already:
    port_deps( dep ).each { |dep| deps << dep unless deps.include? dep }
  end
  
  # return the collect dependencies:
  deps
end

# output all dependencies:
port_deps( ARGV[0] ).sort.each { |dep| puts "- #{dep}" }