lib/gepub/resource_builder.rb
module GEPUB
class ResourceBuilder
include BuilderMixin
class ResourceItem
attr_reader :item
def initialize(item)
@item = item
end
def apply_one_to_multi
true
end
def media_type(val)
@item.set_media_type(val)
end
def method_missing(name, *args, &block)
@item.send(name.to_sym, *args, &block)
end
end
def initialize(book, attributes = {}, &block)
@last_defined_item = nil
@book = book
@dir_prefix = ""
@file_postprocess = {}
@file_preprocess = {}
@files_postprocess = {}
@files_preprocess = {}
current_wd = Dir.getwd
Dir.chdir(attributes[:workdir]) unless attributes[:workdir].nil?
instance_eval(&block)
Dir.chdir current_wd
true
end
def ordered(&block)
@book.ordered {
instance_eval(&block)
}
end
def file(val)
raise "can't specify multiple files on file keyword" if Hash === val && val.length > 1
@file_preprocess.each {
|_k,p|
p.call
}
@last_defined_item = ResourceItem.new(create_one_file(val))
@file_postprocess.each {
|_k,p|
p.call
}
end
def files(*arg)
arg = arg[0] if arg.size == 1 && Hash === arg[0]
@files_preprocess.each {
|_k,p|
p.call
}
@last_defined_item = arg.map {
|val|
ResourceItem.new(create_one_file(val))
}
@files_postprocess.each {
|_k,p|
p.call
}
end
def page_spread_left
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'page_spread_left should be called inside ordered' if (itemref.nil?)
itemref.page_spread_left
end
def page_spread_right
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'page_spread_right should be called inside ordered' if (itemref.nil?)
itemref.page_spread_right
end
def rendition_layout val
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'rendition should be called inside ordered' if (itemref.nil?)
itemref.rendition_layout = val
end
def rendition_orientation val
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'rendition should be called inside ordered' if (itemref.nil?)
itemref.rendition_orientation = val
end
def rendition_spread val
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'rendition should be called inside ordered' if (itemref.nil?)
itemref.rendition_spread = val
end
def linear val
itemref = @book.spine.itemref_by_id[@last_defined_item.item.id]
raise 'linear should be called inside ordered' if (itemref.nil?)
itemref.linear = val
end
def glob(arg)
files(*Dir.glob(arg).select{|x| !File.directory?(x)} )
end
def import(conf, args = {})
dir_prefix_org = @dir_prefix
@dir_prefix = args[:dir_prefix] || ""
Dir.chdir(File.dirname(conf)) {
instance_eval(File.new(File.basename(conf)).read)
}
@dir_prefix = dir_prefix_org
end
def add_resource_dir(name)
import "#{name}/resources.conf", :dir_prefix => name
end
def add_resource_dirs(dirs)
dirs.each do
|dir|
add_resource_dir dir
end
end
def cover_image(val)
file(val)
@last_defined_item.cover_image
end
def nav(val)
file(val)
@last_defined_item.nav
end
def heading(text, id = nil)
@last_defined_item.toc_text_with_id(text, id)
end
def id(the_id)
@last_defined_item.id = the_id
end
def with_media_type(*type)
raise 'with_media_type needs block.' unless block_given?
@file_postprocess['with_media_type'] = Proc.new { media_type(*type) }
@files_postprocess['with_media_type'] = Proc.new { media_type(*type) }
yield
@file_postprocess.delete('with_media_type')
@files_postprocess.delete('with_media_type')
end
def fallback_group
raise 'fallback_group needs block.' unless block_given?
count = 0
before = nil
@files_preprocess['fallback_group'] = Proc.new { raise "can't use files within fallback_group" }
@file_preprocess['fallback_group'] = Proc.new {
before = @last_defined_item
}
@file_postprocess['fallback_group'] = Proc.new {
if count > 0
before.item.set_fallback(@last_defined_item.item.id)
end
count += 1
}
yield
@files_preprocess.delete('fallback_group')
@file_postprocess.delete('fallback_group')
@file_preprocess.delete('fallback_group')
end
def fallback_chain_files(*arg)
files(*arg)
@last_defined_item.inject(nil) {
|item1, item2|
if !item1.nil?
item1.item.set_fallback(item2.item.id)
end
item2
}
end
def handles(media_type)
@last_defined_item.is_handler_of(media_type)
end
private
def create_one_file(val)
name = val
io = val if (String === val && !val.start_with?('http'))
if Hash === val
name = val.first[0]
io = val.first[1]
end
if Array === val
name = val[0]
io = val[1]
end
name = "#{@dir_prefix}/#{name}" if !@dir_prefix.nil? && @dir_prefix.size > 0 && !name.start_with?('http')
@book.add_item(name, content: io)
end
end
end