Feature/lua #42

[sillydan1]

This PR adds Lua as an editor scripting language, enabling you to write plugins and edit keybinds from an init.lua file instead of through Java and GUIs. This is all possible due to gudzpoz's fantastic LuaJava project.

Notes

• The init.lua file must be located in EditorActions.getConfigDir() + "/lua"
  • On MacOS: ~/Library/Application Support/Graphedit/lua
  • On Linux: ~/.local/graphedit/lua
  • On Windows: %APPDATA%\graphedit\lua (untested for now)
• Take a look at the lua bindings types repository to get an idea of what is possible

Minimal Example

ge.log:info("Hello " .. ge.info.name .. " " .. ge.info.version .. "!")

-- Get stuff from the Dependency Injection container
-- TODO: manually importing like this may become a bit cumbersome, maybe we should add a helper function for this
local IBufferContainer = java.import("dk.gtz.graphedit.viewmodel.IBufferContainer")
ge.api.dep:get(IBufferContainer)

-- Add plugins
ge.api.add_plugin({
    name = "Example",
    description = "Example plugin",
    on_start = function()
        ge.log:info("Hello from the Example lua plugin!")
    end,
    on_destroy = function()
        ge.log:info("Goodbye from the Example lua plugin!")
    end,
    -- TODO: These are not supported yet, but I will add them if interest shows.
    -- syntax_factories = {},
    -- panels = {},
    -- importer = function(paths) end,
    -- exporter = function(resource, new_path) end,
})

-- This will overwrite the default keymap if you add a keymap with the same key combination
ge.api.keymap.set("Shortcut+K", function() ge.api.toast:success("Hello from the keymap!") end, "Greeter")
ge.api.keymap.set_in_category("Shortcut+Shift+L", function() ge.api.action:openKeybinds() end, "Open Keybinds", "help")

[sillydan1]

This PR fixes #42