Launcher for the LuaJIT backend.

Looks for main.lua. Launch it like this:

    luajit myapp/lib/luigi/launch.lua

If luigi isn't inside the project directory, pass
the path containing main.lua as the second argument.
The path must end with a directory separator.

    luajit /opt/luigi/launch.lua ./myapp/

If the app prefixes luigi modules with something
other then 'luigi', pass that prefix as the third
argument.

    luajit /opt/luigi/launch.lua ./myapp/ lib.luigi

luigi/launch.lua

@@ -0,0 +1,54 @@
+--[[--
+Launcher for the LuaJIT backend.
+
+Looks for main.lua. Launch it like this:
+
+    luajit myapp/lib/luigi/launch.lua
+
+If luigi isn't inside the project directory, pass
+the path containing main.lua as the second argument.
+The path must end with a directory separator.
+
+    luajit /opt/luigi/launch.lua ./myapp/
+
+If the app prefixes luigi modules with something
+other then 'luigi', pass that prefix as the third
+argument.
+
+    luajit /opt/luigi/launch.lua ./myapp/ lib.luigi
+
+--]]--
+local packagePath = package.path
+local libRoot = arg[0]:gsub('[^/\\]*%.lua$', '')
+local appRoot, modPath = ...
+
+local function run (appRoot, modPath)
+    package.path = packagePath .. ';' .. appRoot .. '?.lua'
+    rawset(_G, 'LUIGI_APP_ROOT', appRoot)
+    require 'main'
+    require (modPath .. '.backend').run()
+end
+
+-- expect to find main.lua in appRoot if specified
+if appRoot then
+    return run(appRoot, modPath or 'luigi')
+end
+
+-- try to find main.lua in a parent of this library, recursively.
+local lastLibRoot = libRoot
+repeat
+    if io.open(libRoot .. 'main.lua') then
+        return run(libRoot, modPath)
+    end
+    lastLibRoot = libRoot
+    libRoot = libRoot:gsub('([^/\\]*).$', function (m)
+        modPath = modPath and (m .. '.' .. modPath) or m
+        return ''
+    end)
+until libRoot == lastLibRoot
+
+error 'main.lua not found'
+
+
+
+