local function join(delimiter, list)
  local result = ""
  local len = #list
  for i, v in ipairs(list) do
    result = result .. tostring(v)
    if i < len then
      result = result .. tostring(delimiter)
    end
  end
  return result
end

local function quoted(str)
  local escaped_str = string.gsub(str, '[\\"]', '\\%1')
  return '"' .. escaped_str .. '"'
end

local lfs = require("lfs")

return {
    cmd = function(cmd)
        if type(cmd) == "string" then
            cmd = {cmd}
        end

        local cmd_line = table.concat(cmd, "\n")
        for i, v in ipairs(cmd) do
            cmd[i] = "\27[32m-> \27[0m" .. string.gsub(cmd[i], "\n", "\n\27[32m-> \27[0m")
        end
        local print_line = table.concat(cmd, "\n")
        print(print_line)
        return assert(os.execute("bash -e -c " .. quoted(cmd_line)))
    end,


    cd = function(path)
        print("\27[32m-> \27[0mcd " .. path)
        assert(lfs.chdir(path))
    end
}