Create Light on player pos?

I wonder if someone could make a quick overview code of how to make a plugin that makes lite when write /light. I can only code c++. And I have made an pseudocode:

Something like this:

string get player input = choose;
bool choose_true_false;

if (choose = "/light") {
choose_true_false = true;

while (choose_true_false = true) {
double pos = getplayerpos();

//create torch on the players pos
CreateBlock(item_id, pos);

//check if player writes /light and if so the while loop breaks
getplayerwrites();

if (getplayerwrites = /light) {
choose_true_false = false;
}
}

Something like that, if you someone understand what I mean. Can someone write a quick java code of this. And explain how the code works. Thanks /mrrabbit