cr-exec
cr-exec 是一个改进的执行库，灵感来自 Crystal 语言。目标是提供一个更好的执行库，更好的用 Ruby 写脚本。
项目描述
cr-exec 是一个受 Crystal 启发的改进执行库。它提供了一些标准库函数的包装，使得使用 Ruby 执行外部命令变得更加方便和高效。
起因
写 shell 没有方便的功能，也没有方便的文档。ruby 很多符号定义跟 shell 是一脉相承，但标准库执行外部命令的函数和行为却不怎么明晰和方便。 前有 open3 和 python 语法的 subprocess，但我想要更简单的用法，做 shell 的现代替代。
所以自己尝试写了一个 libexec，但实现不怎么优雅，也有想从 go rust 的 std 取经的想法。 但 Crystal 作为 ruby 的正统传人，其标准库 文档 源码 更是非常优雅。将它的标准库反向移植过来，岂不是妙哉？
使用方法
# frozen_string_literal: true
require "tempfile"
RSpec.describe Cr::Exec do
it "has a version number" do
expect(Cr::Exec::VERSION).not_to be nil
end
it "print lines" do
Cr::Exec.run("sudo apt update")
end
it "return 0" do
expect(Cr::Exec.code("uname")).to eq 0
end
it "accept multi string" do
expect(Cr::Exec.code("uname -s")).to eq 0
end
it "return 127" do
expect(Cr::Exec.code("unamea")).to eq 127
end
it "get Linux" do
expect(Cr::Exec.output("uname")).to eq "Linux"
end
it "get Linux\n" do
expect(Cr::Exec.output("uname", chomp: false)).to eq "Linux\n"
end
it "log to file" do
tempfile = Tempfile.new(["test_", ".log"])
Cr::Exec.run("uname", out: File.open(tempfile.path, "a+"))
expect(tempfile.readlines).to eq ["Linux\n"]
tempfile.delete
end
it "list file" do
expect(Cr::Exec.each_line("ls spec")).to eq ["cr\n", "spec_helper.rb\n"]
end
it "list file with option" do
expect(Cr::Exec.each_line("ls spec", chomp: true)).to eq ["cr", "spec_helper.rb"]
end
it "always return bool" do
p system("unamea")
expect(Cr::Exec.system?("unamea")).to eq false
end
end
使用例子
https://github.com/initdc/ruby-docker
https://github.com/initdc/gitlab-ci-hello
使用方法
$ gem install cr-exec
require "cr"
Cr.run("uname")
项目地址
gem install cr-exec 之后
3.2.3 :001 > require "cr"
<internal:/usr/local/rvm/rubies/ruby-3.2.3/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require': cannot load such file -- cr (LoadError)
from <internal:/usr/local/rvm/rubies/ruby-3.2.3/lib/ruby/3.2.0/rubygems/core_ext/kernel_require.rb>:38:in `require'
from (irb):1:in `<main>'
from /usr/local/rvm/gems/ruby-3.2.3/gems/irb-1.14.3/exe/irb:9:in `<top (required)>'
from /usr/local/rvm/gems/ruby-3.2.3/bin/irb:25:in `load'
from /usr/local/rvm/gems/ruby-3.2.3/bin/irb:25:in `<main>'
from /usr/local/rvm/gems/ruby-3.2.3/bin/ruby_executable_hooks:22:in `eval'
from /usr/local/rvm/gems/ruby-3.2.3/bin/ruby_executable_hooks:22:in `<main>'
initd
#2
2025年02月15日
codespace 标准 rvm 环境 未能复现
codespace > /workspaces/workspace (master) gem install cr-exec 0 <<9:50:56
Fetching cr-exec-0.1.0.gem
Successfully installed cr-exec-0.1.0
Parsing documentation for cr-exec-0.1.0
Installing ri documentation for cr-exec-0.1.0
Done installing documentation for cr-exec after 3 seconds
1 gem installed
A new release of RubyGems is available: 3.5.11 → 3.6.3!
Run `gem update --system 3.6.3` to update your installation.
codespace > /workspaces/workspace (master) 0 <<9:51:25
codespace > /workspaces/workspace (master) ruby 1.rb 0 <<9:51:25
Linux
codespace > /workspaces/workspace (master) gem info cr-exec 0 <<9:51:38
*** LOCAL GEMS ***
cr-exec (0.1.0)
Author: initdc
Homepage: https://github.com/initdc/cr-exec
Installed at: /usr/local/rvm/gems/ruby-3.3.4
Wrapper for ruby exec
codespace > /workspaces/workspace (master) 0 <<9:53:36