Add pokememes info, convert it to new format and drop unnecessary database tables

This commit introduces pokememes information storage in source code (because they're rarely changed and I always update them manually).

All information about pokememes updated after nerf of 25 April. Also, added buttons to /pokedeks command for changing pages (there are 21 pages already!), and limited one page to 35 pokememes.

lib/migrations/34_delete_pokememes_tables.go

@@ -0,0 +1,38 @@
+// i2_bot – Instinct PokememBro Bot
+// Copyright (c) 2017-2018 Vladimir "fat0troll" Hodakov
+
+package migrations
+
+import (
+	"database/sql"
+	"errors"
+)
+
+// DeletePokememesTablesUp drops `pokememes`, `pokememes_elements` and `pokememes_locations` tables
+// These tables data is rarely changed, so I decided to hold such data in source code
+func DeletePokememesTablesUp(tx *sql.Tx) error {
+	request := "DROP TABLE IF EXISTS `pokememes`"
+	_, err := tx.Exec(request)
+	if err != nil {
+		return err
+	}
+
+	request = "DROP TABLE IF EXISTS `pokememes_elements`"
+	_, err = tx.Exec(request)
+	if err != nil {
+		return err
+	}
+
+	request = "DROP TABLE IF EXISTS `pokememes_locations`"
+	_, err = tx.Exec(request)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// DeletePokememesTablesDown does nothing, because after nerf old information isn't needed at all
+func DeletePokememesTablesDown(tx *sql.Tx) error {
+	return errors.New("This migration is irreversible, as nerf itself")
+}

lib/migrations/migrations.go

@@ -44,6 +44,7 @@ func (m *Migrations) Init() {
 	goose.AddNamedMigration("31_change_squads_table.go", ChangeSquadsTableUp, ChangeSquadsTableDown)
 	goose.AddNamedMigration("32_add_is_active_to_pokememes.go", AddIsActiveToPokememesUp, AddIsActiveToPokememesDown)
 	goose.AddNamedMigration("33_delete_datamapped_tables.go", DeleteDataMappedTablesUp, DeleteDataMappedTablesDown)
+	goose.AddNamedMigration("34_delete_pokememes_tables.go", DeletePokememesTablesUp, DeletePokememesTablesDown)
 }
 
 // Migrate migrates database to current version