Class: MyPrecious::PyPackageInfo::Reader

Inherits:
Object
  • Object
show all
Defined in:
lib/myprecious/python_packages.rb

Overview

Reads package requirements from a file

Instance Method Summary collapse

Constructor Details

#initialize(packages_fpath, only_constrain: false) ⇒ Reader

Returns a new instance of Reader.



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# File 'lib/myprecious/python_packages.rb', line 747

def initialize(packages_fpath, only_constrain: false)
  super()
  @files = [Pathname(packages_fpath)]
  @only_constrain = only_constrain
end

Instance Method Details

#each_installed_package ⇒ Object

Enumerate packages targeted for installation by this instance

Each invocation of the block receives a PyPackageInfo object targeted for installation. Each of these PyPackageInfo object will have a resolved #name and #current_version (if possible).

An Enumerator is returned if no block is given.



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# File 'lib/myprecious/python_packages.rb', line 801

def each_installed_package
  generator = Enumerator.new do |items|
    packages = {}
    
    each_package_constrained do |pkg|
      pkg.resolve_name!
      if packages.has_key?(pkg.name)
        packages[pkg.name].incorporate(pkg)
      else
        packages[pkg.name] = pkg
      end
    end
    
    to_install = []
    packages.each_value do |pkg|
      next unless pkg.install?
      to_install << pkg.name
    end
    
    while pkg_name = to_install.shift
      pkg = packages[pkg_name]
      pkg.resolve_version!
      items << pkg
    end
  end
  
  if block_given?
    generator.each {|item| yield item}
  else
    generator
  end
end

#each_package_constrained ⇒ Object

Enumerate packages described by requirements targeted by this instance

Each invocation of the block receives a PyPackageInfo object, which will have, at minimum, either a #name or #url not nil. It is possible that multiple iterations will process separate PyPackageInfo for the same package, in which case PyPackageInfo#incorporate is useful.

An Enumerator is returned if no block is given.



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# File 'lib/myprecious/python_packages.rb', line 763

def each_package_constrained
  generator = Enumerator.new do |items|
    continued_line = ''
    current_file.each_line do |pkg_line|
      pkg_line = pkg_line.chomp
      next if /^#/ =~ pkg_line
      if /(?<=\s)#.*$/ =~ pkg_line
        pkg_line = pkg_line[0...-$&.length]
      end
      
      # Yes, this _does_ happen after comment lines are skipped :facepalm:
      if /\\$/ =~ pkg_line
        continued_line += pkg_line[0..-2]
        next
      end
      pkg_line, continued_line = (continued_line + pkg_line).strip, ''
      next if pkg_line.empty?
      
      process_line_into(items, pkg_line)
    end
  end
  
  if block_given?
    generator.each {|item| yield item}
  else
    generator
  end
end