使用ruby rake查找动态/共享和静态系统库

Question

I'm trying to write a rake task that can perform a guided search on the user's system for specific system libraries. The basic idea is simple enough (in semi-pseudo-code):

def find_lib names, paths
    foreach name, path do
        return { :name => name, :path => path } if File.exists? File.join(path, name)
    end

    return false
end

find_lib ['mylib1.2', 'mylib12'], ['/usr/lib', '/usr/local/lib']

My actual implementation is a little more elegant, but this shows the basic idea. However, I would like to make this OS agnostic, which throws a few big wrenches into the gears. Each operating system has potentially different prefixes and extensions for a library. For instance, a shared library could be ".dll", ".so', or ".dylib" depending on the current system. So far, I've come up with a solution that involves building a map of prefixes/extensions based on the current operating system:

settings = {}
settings[:dylib_ext] = OS.windows? && ".dll"   ||
                       OS.mac?     && ".dylib" ||
                       ".so"

This works to some extent, although it only covers the dynamic library case, and also relies on an external gem "OS", which I was trying to avoid.

Does anyone know a better way of accomplishing such a task, or if it is a solved problem (via another gem perhaps)? The main thing I'm concerned about is the map, which could get very cumbersome (not to mention that detecting the correct operating system is rather tedious at best, especially if you were to throw in cygwin or mingw).

Answer 1

经过一番思考，似乎我对用户当前的操作系统过于具体，而我真正想确定的始终是用户系统支持的功能...我最终使用的方法是确定可能的前缀/后缀组合的列表，并检查每个组合。