Adding first files

init.lua

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+local flag_pos
+
+minetest.register_tool("flag_chooser:chooser", {
+    description = "Flag Chooser\nChoose a specific flag with this tool",
+    inventory_image = "chooser.png",
+    on_use = function(itemstack, user, pointed_thing)
+        if pointed_thing.type ~= "node" then return end
+        flag_pos = pointed_thing.under
+
+        local node = minetest.get_node(flag_pos)
+        if node.name ~= "pride_flags:upper_mast" then
+            return
+        end
+
+        local formspec = {
+            "formspec_version[4]",
+            "size[11,9]",
+            "dropdown[0.375,2.3;5,2;Dropdown;"..table.concat(pride_flags.get_flags(), ",")  ..";1]",
+            "field[0.375,0.5;3,0.8;flag_name;Choose Flag;".. pride_flags.get_flag_at(flag_pos) .. "]",
+            "button[4.125,0.5;2,0.8;find;Find]",
+            "button[6.25,0.5;2,0.8;choose;Choose]",
+            "button_exit[8.375,0.5;2,0.8;exit;Exit]",
+        }
+        local formspec = table.concat(formspec, "")
+
+        minetest.show_formspec(user:get_player_name(), "flag_chooser:chooser", formspec)
+    end,
+})
+
+local function table_contains(tbl, x) --> https://snippets.bentasker.co.uk/page-2106050929-Check-if-value-exists-in-table-LUA.html
+    local found = false
+    for _, v in pairs(tbl) do
+        if v == x then
+            found = true
+        end
+    end
+    return found
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+    local name = player:get_player_name()
+    if formname ~= "flag_chooser:chooser" then
+        return
+    end
+
+    if fields.find or fields.key_enter_field == "flag_name" then
+        local image = fields.Dropdown
+        if fields.flag_name ~= nil then
+            image = fields.flag_name
+        else
+           image = fields.Dropdown
+        end
+
+        if not table_contains(pride_flags.get_flags(), fields.flag_name) then
+                image = fields.Dropdown
+        end
+
+        local formspec = {
+            "formspec_version[4]",
+            "size[11,9]",
+            "dropdown[0.375,2.3;5,2;Dropdown;"..table.concat(pride_flags.get_flags(), ",")  ..";1]",
+            "field[0.375,0.5;3,0.8;flag_name;Choose Flag;" .. image .. "]",
+            "button[4.125,0.5;2,0.8;find;Find]",
+            "button[6.25,0.5;2,0.8;choose;Choose]",
+            "button_exit[8.375,0.5;2,0.8;exit;Exit]",
+            "image[0.375,5;6,3;".. "prideflag_" .. image .. ".png" ..";]",
+        }
+        local formspec = table.concat(formspec, "")
+        minetest.show_formspec(name, "flag_chooser:chooser", formspec)
+    end
+
+    if fields.choose then
+        if minetest.is_protected(flag_pos, name) and not
+        minetest.check_player_privs(name, "protection_bypass") then
+            minetest.record_protection_violation(flag_pos, name)
+            return
+        end
+        minetest.close_formspec(name, "flag_chooser:chooser")
+        local flag_name = fields.flag_name
+        if flag_name ~= nil then
+            pride_flags.set_flag_at(flag_pos, flag_name)
+        end
+    end
+end)
+
+local ingot_steel
+if minetest.get_modpath("default") then
+    ingot_steel = "default:steel_ingot"
+    minetest.register_craft({
+        output = "flag_chooser:chooser",
+        recipe = {
+            {"", ingot_steel, ""},
+            {ingot_steel, "pride_flags:upper_mast", ingot_steel},
+            {"", ingot_steel, ""},
+        }
+    })
+end

mod.conf

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+name = flag_chooser
+depends = pride_flags
+optional_depends = default