Added updated find_headers.rb from ResearchKit git

- Added find_headers.rb from ResearchKit repository.
- Updated find_headers.rb to take a projectfile and a target rather than hard coding them. This makes it easier to use the find_headers.rb in other projects.

scripts/find_headers.rb

@@ -0,0 +1,82 @@
+#!/usr/bin/env ruby
+
+# Copyright (c) 2015, Dasmer Singh. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+# 1.  Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# 2.  Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation and/or
+# other materials provided with the distribution.
+#
+# 3.  Neither the name of the copyright holder(s) nor the names of any contributors
+# may be used to endorse or promote products derived from this software without
+# specific prior written permission. No license is granted to the trademarks of
+# the copyright holders even if such marks are included in this software.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+require 'pathname'
+require 'xcodeproj'
+require 'optparse'
+
+ROOT = Pathname.new(File.expand_path('../../', __FILE__))
+
+options = {}
+OptionParser.new do |opts|
+  opts.banner = 'Usage: find_headers.rb [options] target projectfile'
+
+  opts.on('--public', 'Find public headers') do |v|
+    options[:public] = v
+  end
+
+  opts.on('--private', 'Find private headers') do |v|
+    options[:private] = v
+  end
+end.parse!
+
+target_name = ARGV[0]
+projectfile = ARGV[1]
+
+required_opts = options[:public] || options[:private]
+fail ArgumentError, 'Must provide --public or --private' unless required_opts
+
+separator = "\n"
+
+project = Xcodeproj::Project.open(ROOT + projectfile)
+target = project.targets.find { |t| t.name == target_name }
+
+public_headers = target.headers_build_phase.files.select do |build_file|
+  settings = build_file.settings
+  settings && settings['ATTRIBUTES'].include?('Public')
+end
+
+private_headers = target.headers_build_phase.files.select do |build_file|
+  settings = build_file.settings
+  settings && settings['ATTRIBUTES'].include?('Private')
+end
+
+if options[:public]
+  puts public_headers.map { |build_file|
+    build_file.file_ref.real_path.relative_path_from(ROOT)
+  }.join(separator)
+end
+
+if options[:private]
+  puts private_headers.map { |build_file|
+    build_file.file_ref.real_path.relative_path_from(ROOT)
+  }.join(separator)
+end