feat: better logging

Closes #1

README.md

@@ -101,29 +101,36 @@ migrator.next_version     # => 1
 migrator.previous_version # => nil
 
 migrator.up
+# =>  INFO -- : Migrating up to version 0 → 1
 # =>  INFO -- : Successfully migrated from version 0 to 1 in 37.602ms
 migrator.current_version  # => 1
 migrator.previous_version # => 0
 
 migrator.down
+# =>  INFO -- : Migrating down to version 1 → 0
 # =>  INFO -- : Successfully migrated from version 1 to 0 in 27.027ms
 migrator.current_version # => 0
 
 migrator.to(10)
+# =>  INFO -- : Migrating up to version 0 → 1 → 2 → 10
 # =>  INFO -- : Successfully migrated from version 0 to 10 in 62.214ms
 migrator.current_version # => 10
 migrator.next_version    # => nil
 
 migrator.redo
+# =>  INFO -- : Migrating down to version 10 → 2 → 1 → 0
 # =>  INFO -- : Successfully migrated from version 10 to 0 in 30.006ms
+# =>  INFO -- : Migrating up to version 0 → 1 → 2 → 10
 # =>  INFO -- : Successfully migrated from version 0 to 10 in 72.877ms
 migrator.current_version # => 10
 
 migrator.reset
+# =>  INFO -- : Migrating down to version 10 → 2 → 1 → 0
 # =>  INFO -- : Successfully migrated from version 10 to 0 in 28.958ms
 migrator.current_version # => 0
 
 migrator.to_latest
+# =>  INFO -- : Migrating up to version 0 → 1 → 2 → 10
 # =>  INFO -- : Successfully migrated from version 0 to 10 in 39.189ms
 migrator.current_version # => 10
 ```
@@ -147,11 +154,7 @@ Usage:
 
 ```
 $ cake db:migrate
-DEBUG -- : CREATE TABLE IF NOT EXISTS version (version INT NOT NULL)
-DEBUG -- : SELECT COUNT(version) FROM version
-DEBUG -- : SELECT version FROM version
-DEBUG -- : Applied versions: 1, 2, 10
-DEBUG -- : SELECT version FROM version
+ INFO -- : Migrating up to version 0 → 1 → 2 → 10
  INFO -- : Successfully migrated from version 0 to 10 in 33.46ms
 ```
 

src/migrate/migrator.cr

@@ -24,7 +24,6 @@ module Migrate
         table:  @table,
       }
 
-      @logger.try &.debug(query)
       @db.scalar(query).as(Int32 | Int64)
     end
 
@@ -102,7 +101,21 @@ module Migrate
         end
       end
 
-      @logger.try &.debug("Applied versions: #{applied_versions.map(&.to_s).join(", ")}")
+      case direction
+      when Direction::Up
+        @logger.try &.info("Migrating up to version #{applied_versions.dup.unshift(current.to_i64).map(&.to_s).join(" → ")}")
+      when Direction::Down
+        # Add previous version to the list of applied versions,
+        # turning "10 → 2" into "10 → 2 → 1"
+        versions = applied_versions.dup.tap do |v|
+          index = all_versions.index(v[0])
+          if index && index > 0
+            v.unshift(all_versions[index - 1])
+          end
+        end
+
+        @logger.try &.info("Migrating down to version #{versions.reverse.map(&.to_s).join(" → ")}")
+      end
 
       applied_files = migrations.select do |filename|
         applied_versions.includes?(MIGRATION_FILE_REGEX.match(filename).not_nil!["version"].to_i)
@@ -123,9 +136,11 @@ module Migrate
 
       @db.transaction do |tx|
         queries.each do |query|
+          @logger.try &.debug(query)
           tx.connection.exec(query)
         end
 
+        @logger.try &.debug(update_version_query(target_version))
         tx.connection.exec(update_version_query(target_version))
       end