tools/migration/main.lua: Add command-line parsing, including --config=CONFIG_FILE...

diff --git a/tools/migration/main.lua b/tools/migration/main.lua
index a88da21e821ff0949775a5e098220aa7ca4b7072..772349bf7b50f8408226c9fdb037abe175dcfcf9 100644 (file)
--- a/tools/migration/main.lua
+++ b/tools/migration/main.lua
@@ -1,21 +1,39 @@
+-- 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) return loadin and loadin(env, io.open(file):read("*a")) or setfenv(loadfile(file), env); end
 config = {};
 local config_env = setmetatable({}, { __index = function(t, k) return function(tbl) config[k] = tbl; end; end });
-loadfilein("config.lua", config_env)();
+loadfilein(options.config or "config.lua", config_env)();
 
-package.path = "../../?.lua;"..package.path
-package.cpath = "../../?.dll;"..package.cpath
+if not package.loaded["util.json"] then
+       package.path = "../../?.lua;"..package.path
+       package.cpath = "../../?.dll;"..package.cpath
+end
 
+local from_store = arg[1] or "input";
+local to_store = arg[2] or "output";
 
-assert(config.input, "no input specified")
-assert(config.output, "no output specified")
-local itype = assert(config.input.type, "no input.type specified");
-local otype = assert(config.output.type, "no output.type specified");
-local reader = require(itype).reader(config.input);
-local writer = require(otype).writer(config.output);
+assert(config[from_store], "no input specified")
+assert(config[to_store], "no output specified")
+local itype = assert(config[from_store].type, "no type specified for "..from_store);
+local otype = assert(config[to_store].type, "no type specified for "..to_store);
+local reader = require(itype).reader(config[from_store]);
+local writer = require(otype).writer(config[to_store]);
 
 local json = require "util.json";