single dropping

control.lua

local function ingredients_contains(ingredients, item_name)
    for _, ingredient in pairs(ingredients) do
        if ingredient.name == item_name then
            return true
        end
    end
    return false
end

script.on_event(defines.events.on_player_cursor_stack_changed, function(event)
    local player = game.get_player(event.player_index)
    if not player then return end
    local item_stack = player.cursor_stack
    if not item_stack then return end

    local old_content = storage.cursor_stack_contents
    local current_content = item_stack.valid_for_read and { name = item_stack.name, count = item_stack.count } or nil
    storage.cursor_stack_contents = current_content
    if not storage.elements.settings.capture_put.state then return end

    if not old_content then return end
    if not current_content then return end
    if old_content.name ~= current_content.name then return end
    if old_content.count - current_content.count ~= 1 then return end

    local entity = player.selected
    if not entity then return end
    local item_name = old_content.name

    local inventory = nil
    if entity.get_fuel_inventory() and prototypes.item[item_name].fuel_category then
        inventory = "Fuel"
    elseif entity.type == "lab" then
        if prototypes.item[item_name].type == "module" then
            inventory = "Modules"
        else
            inventory = "Input"
        end
    elseif entity.type == "mining-drill" then
        inventory = "Modules"
    elseif entity.type == "container" then
        inventory = chest_list[entity.name] ~= nil and "Chest" or "Wreck"
    elseif entity.type == "beacon" then
        inventory = "Modules"
    elseif prototypes.item[item_name].type == "module" then
        local recipe = entity.type == "assembling-machine" and entity.get_recipe() or nil
        local ingredients = recipe and recipe.ingredients
        if ingredients and ingredients_contains(ingredients, item_name) then
            inventory = "Input"
        elseif entity.get_module_inventory() == entity.get_inventory(defines.inventory.crafter_modules) then
            inventory = "Modules"
        end
        -- otherwise, ??? don't know which inventory this module goes in
    elseif entity.type == "car" and prototypes.item[item_name].type == "ammo" then
        inventory = "Ammo 1"
    else
        if entity.get_inventory(defines.inventory.crafter_input) then
            inventory = "Input"
        else
            return
        end
    end

    local modifier
    if entity.type == "car" then --TODO handle other vehicles
        modifier = "vehicle"
    end

    if inventory then
        local transfer_count = 1
        local transfer_count_description = transfer_count .. " x"
        add_action({"tas_helper.description_put", transfer_count_description, item_name, entity_to_string(entity)}, {
            type = "put",
            entity = entity,
            position = entity.position,
            item_name = item_name,
            count = transfer_count,
            inventory = inventory,
            modifier = modifier,
            highlight_box_bounds = entity.selection_box,
        })
    else
        game.print("Error: Couldn't identify correct inventory when exporting action 'Put' with entity " .. entity.name .. " and item " .. item_name)
    end
end)