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local default_config = "./migrator.cfg.lua";
-- Command-line parsing
local options = {};
local handled_opts = 0;
for i = 1, #arg do
if arg[i]:sub(1,2) == "--" then
local opt, val = arg[i]:match("([%w-]+)=?(.*)");
if opt then
options[(opt:sub(3):gsub("%-", "_"))] = #val > 0 and val or true;
end
handled_opts = i;
else
break;
end
end
table.remove(arg, handled_opts);
-- Load config file
local function loadfilein(file, env)
if loadin then
return loadin(env, io.open(file):read("*a"));
else
local chunk, err = loadfile(file);
if chunk then
setfenv(chunk, env);
end
return chunk, err;
end
end
local config_file = options.config or default_config;
local from_store = arg[1] or "input";
local to_store = arg[2] or "output";
config = {};
local config_env = setmetatable({}, { __index = function(t, k) return function(tbl) config[k] = tbl; end; end });
local config_chunk, err = loadfilein(config_file, config_env);
if not config_chunk then
print("There was an error loading the config file, check the file exists");
print("and that the syntax is correct:");
print("", err);
os.exit(1);
end
config_chunk();
if not package.loaded["util.json"] then
package.path = "../../?.lua;"..package.path
package.cpath = "../../?.dll;"..package.cpath
end
local have_err;
if #arg > 0 and #arg ~= 2 then
have_err = true;
print("Error: Incorrect number of parameters supplied.");
end
if not config[from_store] then
have_err = true;
print("Error: Input store '"..from_store.."' not found in the config file.");
end
if not config[to_store] then
have_err = true;
print("Error: Output store '"..to_store.."' not found in the config file.");
end
if not config[from_store].type then
have_err = true;
print("Error: Input store type not specified in the config file");
elseif not pcall(require, config[from_store].type) then
have_err = true;
print("Error: Unrecognised store type for '"..from_store.."': "..config[from_store].type);
end
if not config[to_store].type then
have_err = true;
print("Error: Output store type not specified in the config file");
elseif not pcall(require, config[to_store].type) then
have_err = true;
print("Error: Unrecognised store type for '"..to_store.."': "..config[to_store].type);
end
if have_err then
print("");
print("Usage: "..arg[0].." FROM_STORE TO_STORE");
print("If no stores are specified, 'input' and 'output' are used.");
print("");
print("The available stores in your migrator config are:");
print("");
for store in pairs(config) do
print("", store);
end
os.exit(1);
end
local itype = config[from_store].type;
local otype = config[to_store].type;
local reader = require(itype).reader(config[from_store]);
local writer = require(otype).writer(config[to_store]);
local json = require "util.json";
for x in reader do
--print(json.encode(x))
writer(x);
end
writer(nil); -- close
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