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module Ditz
class HookManager
def initialize
@descs = {}
@blocks = {}
end
@@instance = nil
def self.method_missing m, *a, &b
@@instance ||= self.new
@@instance.send m, *a, &b
end
def register name, desc
@descs[name] = desc
@blocks[name] = []
end
def on *names, &block
names.each do |name|
raise "unregistered hook #{name.inspect}" unless @descs[name]
@blocks[name] << block
end
end
def run name, *args
raise "unregistered hook #{name.inspect}" unless @descs[name]
blocks = hooks_for name
return false if blocks.empty?
blocks.each { |block| block[*args] }
true
end
def print_hooks f=$stdout
puts <<EOS
Ditz has #{@descs.size} registered hooks:
EOS
@descs.map{ |k,v| [k.to_s,v] }.sort.each do |name, desc|
f.puts <<EOS
#{name}
#{"-" * name.length}
#{desc}
EOS
end
end
def enabled? name; !hooks_for(name).empty? end
def hooks_for name
if @blocks[name].nil? || @blocks[name].empty?
dirs = [Ditz::home_dir, Ditz::find_dir_containing(".ditz")].compact.map do |d|
File.join d, ".ditz", "hooks"
end
Ditz::debug "looking for hooks in #{dirs.join(" and ")}"
files = dirs.map { |d| Dir[File.join(d, "*.rb")] }.flatten
files.each do |fn|
Ditz::debug "loading hook file #{fn}"
require File.expand_path(fn)
end
end
@blocks[name] || []
end
end
end
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