有没有办法验证
Ruby程序内部是否有最新版本的gem？也就是说,有没有办法通过编程方式来捆绑过时的#{gemname}？
我试着看着bundler的源代码,但我找不到一个直接的方式.目前我正在做这件事,这是脆弱,缓慢,如此不善：
IO.popen(%w{/usr/bin/env bundle outdated gemname}) do |proc|
output = proc.readlines.join("\n")
return output.include?("Your bundle is up to date!")
end
解决方法
避免外部执行的一种方法：
对于Bundler 1.2.x
require 'bundler/cli'
# intercepting $stdout into a StringIO
old_stdout,$stdout = $stdout,StringIO.new
# running the same code run in the 'bundler outdated' utility
Bundler::CLI.new.outdated('rails')
# storing the output
output = $stdout.string
# restoring $stdout
$stdout = old_stdout
对于bundler 1.3.x
require 'bundler/cli'
require 'bundler/friendly_errors'
# let's cheat the CLI class with fake exit method
module Bundler
class CLI
desc 'exit','fake exit' # this is required by Thor
def exit(*); end # simply do nothing
end
end
# intercepting $stdout into a StringIO
old_stdout,StringIO.new
# running the same code run in the 'bundler outdated' utility
Bundler.with_friendly_errors { Bundler::CLI.start(['outdated','rails']) }
# storing the output
output = $stdout.string
# restoring $stdout
$stdout = old_stdout