notifier.lua

minetest.register_node("block_alert:notifier",
{
    description = "Notifier Block",
    tiles = {"block_alert_notifier.png"},
    groups = {choppy = 2, oddly_breakable_by_hand = 2, wood = 1},

    after_place_node = function(pos, placer)
        local meta = minetest.get_meta(pos)
        meta:mark_as_private("name")
        meta:set_string("name", "Notifier")
        meta:mark_as_private("notify_setting")
        meta:set_string("notify_setting", "others")
        SnitchRegistry.register("block_alert:notifier", pos)
    end,
    after_dig_node = function(pos, placer, itemstack, pointed_thing)
       SnitchRegistry.unregister("block_alert:notifier", pos)
    end,
    on_rightclick = function(pos, node, clicker, itemstack, pointed_thing)
       notifier.handle_formspec_open(pos, clicker)
    end,
    on_proximity_entered = function(pos, player)
       notifier.handle_player_event(player, pos, "entered")
    end,
    on_proximity_exited = function(pos, player)
       notifier.handle_player_event(player, pos, "exited")
    end,
    on_proximity_join = function(pos, player)
       notifier.handle_player_event(player, pos, "logged in at")
    end,
    on_proximity_leave = function(pos, player)
       notifier.handle_player_event(player, pos, "logged out at")
    end
})

minetest.register_craft({
    type = "shaped",
    output = "block_alert:notifier",
    recipe = {
        {"group:wood", "group:wood"     ,"group:wood"},
        {"group:wood", "default:iron_ingot","group:wood"},
        {"group:wood", "group:wood"     ,"group:wood"}
    }
})

local function get_formspec(name)
    local formspec = {
        "size[6,4]",
        "real_coordinates[true]",
        "field[0.5,1;5,1;name;Rename Notifier;"
           .. minetest.formspec_escape(name) .. "]",
        "button_exit[1.5,2.5;3,1;rename;Rename]"
    }
    return table.concat(formspec, "")
end

function notifier.handle_player_event(player, node_pos, event_type)
    local reinf = ct.get_reinforcement(node_pos)
    if reinf then
        local meta = minetest.get_meta(node_pos)
        local setting = meta:get_string("notify_setting")
        local pname = player:get_player_name()
        if setting == "others" then
            -- Make sure that we don't send a message if the player is on the group
            local player_id = pm.get_player_by_name(pname).id
            if player_id and pm.get_player_group(player_id, reinf.ctgroup_id) then
               return
            end
        end
        local message = pname .. " " .. event_type .. " " .. meta:get_string("name")
           .. " at " .. minetest.pos_to_string(node_pos)
        pm.send_chat_group(reinf.ctgroup_id, message)
    end
end

local playerRenamePos = {}

function notifier.handle_formspec_open(pos, clicker)
    local pname = clicker and clicker:get_player_name() or ""
    local meta = minetest.get_meta(pos)
    if util.check_permission(pos, pname) then
        playerRenamePos[pname] = pos
        minetest.show_formspec(
           pname, "block_alert:notifier_rename",
           get_formspec(meta:get_string("name"))
        )
    end
end

function notifier.handle_formspec_submission(player, fields)
    if fields.name then
        local pname = (player and player:get_player_name()) or ""
        local meta = minetest.get_meta(playerRenamePos[pname])
        if util.check_permission(playerRenamePos[pname],pname) then
            meta:set_string("name", fields.name)
        end
    end
end

minetest.register_on_player_receive_fields(function(player, formname, fields)
    if formname == "block_alert:notifier_rename" then
       notifier.handle_formspec_submission(player, fields)
    end
end)