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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
module Clamp
module Option
module Parsing
protected
def parse_options
set_options_from_command_line
default_options_from_environment
verify_required_options_are_set
end
private
def set_options_from_command_line
while remaining_arguments.first && remaining_arguments.first.start_with?("-")
switch = remaining_arguments.shift
break if switch == "--"
case switch
when /\A(-\w)(.+)\z/m # combined short options
switch = Regexp.last_match(1)
if find_option(switch).flag?
remaining_arguments.unshift("-" + Regexp.last_match(2))
else
remaining_arguments.unshift(Regexp.last_match(2))
end
when /\A(--[^=]+)=(.*)\z/m
switch = Regexp.last_match(1)
remaining_arguments.unshift(Regexp.last_match(2))
end
option = find_option(switch)
value = option.extract_value(switch, remaining_arguments)
begin
option.of(self).take(value)
rescue ArgumentError => e
signal_usage_error Clamp.message(:option_argument_error, :switch => switch, :message => e.message)
end
end
end
def default_options_from_environment
self.class.recognised_options.each do |option|
option.of(self).default_from_environment
end
end
def verify_required_options_are_set
self.class.recognised_options.each do |option|
# If this option is required and the value is nil, there's an error.
next unless option.required? && send(option.attribute_name).nil?
if option.environment_variable
message = Clamp.message(:option_or_env_required,
:option => option.switches.first,
:env => option.environment_variable)
else
message = Clamp.message(:option_required,
:option => option.switches.first)
end
signal_usage_error message
end
end
def find_option(switch)
self.class.find_option(switch) ||
signal_usage_error(Clamp.message(:unrecognised_option, :switch => switch))
end
end
end
end
|
