Nice way to build IntelliJ IDEA's global libraries list from installed java packages on your Debian/Ubuntu system

idea-global-libs.rb

#!/usr/bin/env ruby

# this script builds applicationLibraries.xml for IDEA from java
# packages on your debian/ubuntu system
#
# This is public domain

require 'rubygems'
require 'activesupport'
require 'erb'

require 'pp'

out = `dpkg -S /usr/share/java`.strip
if out.empty?
  raise "No java libs?"
end

out = out.chomp(': /usr/share/java').strip
if out.empty?
  raise "No java libs?"
end

packages = out.split(",").map(&:strip)

package_jars = {}

packages.each do |package|
  STDERR.puts "processing #{package}..."
  relevant_files = `dpkg -L #{package} | grep /usr/share/java`.split.map(&:chomp)
  real_relevant_files = relevant_files.select do |p|
    File.file?(p) && !File.symlink?(p)
  end
  next if real_relevant_files.empty?

  relevant_files.each do |path|
    next unless File.symlink?(path)
    target = File.expand_path(File.readlink(path), File.dirname(path))
    if real_relevant_files.include?(target)
      real_relevant_files.delete target
      real_relevant_files << path
    end
  end

  info = package_jars[package] = {
    :package => package,
    :jars => real_relevant_files,
  }

  # now try to finding javadoc
  candidates = ["/usr/share/doc/#{package}/api",
                "/usr/share/doc/#{package}/doc/api",
                "/usr/share/doc/#{package}-doc/api",
                "/usr/share/doc/#{package}-doc/doc/api"]
  javadoc_path = candidates.detect(&File.method(:exists?))
  unless javadoc_path
    STDERR.print "missing javadoc for #{package}: "
    # check if doc package exists / installed
    system "apt-cache show #{package}-doc >/dev/null 2>&1"
    if $?.exitstatus != 0
      STDERR.puts "no javadoc package detected"
    else
      system "dpkg -L #{package}-doc >/dev/null 2>&1"
      if $?.exitstatus != 0
        STDERR.puts "package #{package}-doc is not installed"
      else
        STDERR.puts "should be there, but failed to locate !"
      end
    end
  else
    info[:javadoc] = javadoc_path
  end
end

TEMPLATE = <<HERE
    <library name="<%= p[:package] %>">
      <CLASSES>
<% p[:jars].each do |path| -%>
        <root url="jar://<%= path %>!/" />
<% end -%>
      </CLASSES>
<% if p[:javadoc] -%>
      <JAVADOC>
        <root url="file://<%= p[:javadoc] %>"/>
      </JAVADOC><% else -%>
      <JAVADOC /><% end -%><SOURCES />
    </library>
HERE

print <<HERE
<?xml version="1.0" encoding="UTF-8"?>
<application>
  <component name="libraryTable">
HERE

package_jars.values.each do |p|
  print ERB.new(TEMPLATE, 3, '-').result(binding)
end

print <<HERE
  </component>
</application>
HERE