vis-lua: add vis:command_register to map a Lua function to a :-command

The following registers `:foo` as a command which prints a few things to
stdout:

 vis:command_register("foo", function(argv, force, win, cursor, range)
	 for i,arg in ipairs(argv) do
		 print(i..": "..arg)
	 end
	 print("was command forced with ! "..(force and "yes" or "no"))
	 print(win.file.name)
	 print(cursor.pos)
	 print(range ~= nil and ('['..range.start..', '..range.finish..']') or "invalid range")
	 return true;
 end)

0 files changed, 0 insertions, 0 deletions