1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
require 'backports/tools/alias_method_chain'
require 'backports/tools/arguments'
module Backports
# Metaprogramming utility to convert the first file argument to path
def self.convert_first_argument_to_path(klass, selector)
mod = class << klass; self; end
unless mod.method_defined? selector
warn "#{mod}##{selector} is not defined, so argument can't converted to path"
return
end
arity = mod.instance_method(selector).arity
last_arg = []
if arity < 0
last_arg = ["*rest"]
arity = -1-arity
end
arg_sequence = (["file"] + (1...arity).map{|i| "arg_#{i}"} + last_arg + ["&block"]).join(", ")
alias_method_chain(mod, selector, :potential_path_argument) do |aliased_target, punctuation|
mod.module_eval <<-end_eval, __FILE__, __LINE__ + 1
def #{aliased_target}_with_potential_path_argument#{punctuation}(#{arg_sequence})
file = Backports.convert_path(file)
#{aliased_target}_without_potential_path_argument#{punctuation}(#{arg_sequence})
end
end_eval
end
end
# Metaprogramming utility to convert all file arguments to paths
def self.convert_all_arguments_to_path(klass, selector, skip)
mod = class << klass; self; end
unless mod.method_defined? selector
warn "#{mod}##{selector} is not defined, so arguments can't converted to path"
return
end
first_args = (1..skip).map{|i| "arg_#{i}"}.join(",") + (skip > 0 ? "," : "")
alias_method_chain(mod, selector, :potential_path_arguments) do |aliased_target, punctuation|
mod.module_eval <<-end_eval, __FILE__, __LINE__ + 1
def #{aliased_target}_with_potential_path_arguments#{punctuation}(#{first_args}*files, &block)
files = files.map{|f| Backports.convert_path(f) }
#{aliased_target}_without_potential_path_arguments#{punctuation}(#{first_args}*files, &block)
end
end_eval
end
end
def self.convert_path(path)
try_convert(path, IO, :to_io) ||
begin
path = path.to_path if path.respond_to?(:to_path)
try_convert(path, String, :to_str) || path
end
end
end
|
