在读取 Lua 模块文件时尝试获取 PATH 变量的值。

我正在尝试在 lua 脚本中读取模块文件中给定的 PATH 变量的值。我不确定是否可以使用 lua 中的某些函数来完成这项任务，因为我对 lua 还比较陌生。

模块文件（netcdf），下面只给出了部分模块文件 -

set application netcdf
set version 4.1.1

set machine kgb
set app_base /sw/$machine/$application/$version

module-whatis "Sets up environment to use serial netcdf"
if [ module-info mode whatis ] {
  break
}

  #vvvvv If if not a library, remove this part vvvvv
  if [ is-loaded intel ] {
    set app_build "centos6.2_intel12"
  } elseif [ is-loaded gcc ] {
    set app_build "centos6.2_gnu4.4.6"
    break
  } elseif [ is-loaded pgi ] {
    set app_build "centos6.2_pgi12.3"
    break
  } else {
    puts stderr "You must have a programming environment loaded to use this module"
    break
  }
  #^^^^^ If if not a library, remove this part ^^^^^

  # This assumes something like --prefix=$SW_BLDDIR
  set app_path $app_base/$app_build

  setenv NETCDF_DIR "$app_path"
  setenv NETCDF_INCLUDE "$app_path/include"
  setenv NETCDF_LIB "$app_path/lib"
  #setenv NETCDF_LINK "-I${FOO_INCLUDE} -L${FOO_LIB} -lfoo"

  prepend-path PATH             "$app_path/bin"
  prepend-path LD_LIBRARY_PATH  "$app_path/lib"

我正在读取此文件，是否有任何方法可以获取所有三个可能的 PATH 组合值，而不考虑用户/系统的环境，即：

- PATH = /sw/kgb/netcdf/4.1.1/centos6.2_intel12/bin
- PATH = /sw/kgb/netcdf/4.1.1/centos6.2_gnu4.4.6/bin
- PATH = /sw/kgb/netcdf/4.1.1/centos6.2_pgi12.3/bin

我编写的代码只读取了文件的每一行，但是很难将值排列到变量中并获取所需的 PATH。

Lua 代码 -

-- reading module file
local mfile = v.file
local lines = lines_from(mfile)

-- print all line numbers and their contents
for k ,v in pairs(lines)do
   print('line['..k..']',v)
end

-- see if file exists
function file_exists(file)
   local f = io.open(file,"rb")
   if f then f:close() end
   return f~= nil
end

-- get all lines from a file, returns an empty
-- list/table if the file does not exists
function lines_from(file)
   if not file_exists(file) then return {} end
   local lines = {}
   for line in io.lines(file) do
     if (string.match(line, 'set') or string.match(line,'prepend'))then
       lines[#lines+1] = line
     end
   end
   return lines
end

我获得的输出只显示了我需要的感兴趣的行，但是获得所有可能的 PATH 值仍然离我很远，谢谢您的帮助！