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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
require 'monitor'
module Kernel
RUBYGEMS_ACTIVATION_MONITOR = Monitor.new # :nodoc:
if defined?(gem_original_require) then
# Ruby ships with a custom_require, override its require
remove_method :require
else
##
# The Kernel#require from before RubyGems was loaded.
alias gem_original_require require
private :gem_original_require
end
##
# When RubyGems is required, Kernel#require is replaced with our own which
# is capable of loading gems on demand.
#
# When you call <tt>require 'x'</tt>, this is what happens:
# * If the file can be loaded from the existing Ruby loadpath, it
# is.
# * Otherwise, installed gems are searched for a file that matches.
# If it's found in gem 'y', that gem is activated (added to the
# loadpath).
#
# The normal <tt>require</tt> functionality of returning false if
# that file has already been loaded is preserved.
def require path
RUBYGEMS_ACTIVATION_MONITOR.enter
path = path.to_path if path.respond_to? :to_path
spec = Gem.find_unresolved_default_spec(path)
if spec
Gem.remove_unresolved_default_spec(spec)
gem(spec.name)
end
# If there are no unresolved deps, then we can use just try
# normal require handle loading a gem from the rescue below.
if Gem::Specification.unresolved_deps.empty? then
RUBYGEMS_ACTIVATION_MONITOR.exit
return gem_original_require(path)
end
# If +path+ is for a gem that has already been loaded, don't
# bother trying to find it in an unresolved gem, just go straight
# to normal require.
#--
# TODO request access to the C implementation of this to speed up RubyGems
spec = Gem::Specification.stubs.find { |s|
s.activated? and s.contains_requirable_file? path
}
begin
RUBYGEMS_ACTIVATION_MONITOR.exit
return gem_original_require(spec.to_fullpath(path) || path)
end if spec
# Attempt to find +path+ in any unresolved gems...
found_specs = Gem::Specification.find_in_unresolved path
# If there are no directly unresolved gems, then try and find +path+
# in any gems that are available via the currently unresolved gems.
# For example, given:
#
# a => b => c => d
#
# If a and b are currently active with c being unresolved and d.rb is
# requested, then find_in_unresolved_tree will find d.rb in d because
# it's a dependency of c.
#
if found_specs.empty? then
found_specs = Gem::Specification.find_in_unresolved_tree path
found_specs.each do |found_spec|
found_spec.activate
end
# We found +path+ directly in an unresolved gem. Now we figure out, of
# the possible found specs, which one we should activate.
else
# Check that all the found specs are just different
# versions of the same gem
names = found_specs.map(&:name).uniq
if names.size > 1 then
RUBYGEMS_ACTIVATION_MONITOR.exit
raise Gem::LoadError, "#{path} found in multiple gems: #{names.join ', '}"
end
# Ok, now find a gem that has no conflicts, starting
# at the highest version.
valid = found_specs.select { |s| s.conflicts.empty? }.last
unless valid then
le = Gem::LoadError.new "unable to find a version of '#{names.first}' to activate"
le.name = names.first
RUBYGEMS_ACTIVATION_MONITOR.exit
raise le
end
valid.activate
end
RUBYGEMS_ACTIVATION_MONITOR.exit
return gem_original_require(path)
rescue LoadError => load_error
RUBYGEMS_ACTIVATION_MONITOR.enter
if load_error.message.start_with?("Could not find") or
(load_error.message.end_with?(path) and Gem.try_activate(path)) then
RUBYGEMS_ACTIVATION_MONITOR.exit
return gem_original_require(path)
else
RUBYGEMS_ACTIVATION_MONITOR.exit
end
raise load_error
end
private :require
end
|
