Hi--
I wrote up some code for doing dependency resolution. Right now I am
using my own Version class to do the constraint comparisons, but it
shouldn't too hard to adapt to RubyGems'.
def rubygems_resolve
requests = []
matches = []
missing = []
gems.each do |name, constraint|
gem_dep = Gem::Dependency.new(name, [constraint])
rubygems_resolve_gem(gem_dep, requests, matches, missing)
end
libs = matches.group_by{ |spec| spec.name }
requests.each do |name, constraint|
next unless libs[name]
libs[name].reject! do |spec|
!Gemdo::VersionNumber.new(spec.version.to_s).match?
(constraint.to_s)
end
end
libs.each do |name, specs|
print "#{name} ("
print specs.sort.reverse.map{ |spec|
"#{spec.version}" }.join(', ')
print ")"
puts
end
missing.each do |gem_dep|
puts "#{gem_dep.name} ()"
end
end
# recursive resolution of dependencies
def rubygems_resolve_gem(gem_dep, requests=[], matches=[],
missing=[])
requests << [gem_dep.name, gem_dep.requirement]
list = Gem.source_index.find_name(gem_dep.name,
gem_dep.requirement)
missing << gem_dep if list.empty?
matches.concat(list)
list.each do |spec|
next if matches.include?(spec)
spec.runtime_dependencies.each do |dep_gem|
next if missing.include?(gem_dep)
rubygems_resolve_gem(dep_gem, matches, missing)
end
spec.development_dependencies.each do |dep_gem|
next if missing.include?(gem_dep)
rubygems_resolve_gem(dep_gem, matches, missing)
end
end
end
The `gems` method used on the fifth line just returns a list of the
current project requirements in an assoc list of [foo, '>= 1.0']
format.
Currently this code only works against installed gems. To work really
well it would need to support remote lookup too. I haven't endeavored
into that b/c of the bug I ran into that I mentioned in my last post.
Any advice on adding that would be appreciated though.
With a bit of tweaking perhaps this can get into the RubyGems?
While I am on the subject, the Gemdo::Version class I'm using can
handle version constraints in these formats:
1.0+ (same as >= 1.0)
1.0- (same as < 1.0)
1.0~ (same as ~> 1.0)
It would very nice if RubyGems could handle constraints like that at
well.
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