repo: update repository description field to contain more than 256 symbols (#5219)

* Update repository description field to contain more than 256 symbols

- update repository model - description field now is `TEXT` and limited by 4000 symbols
- new migration
- add description to html forms - repo creation and repo settings
- add translation for description

* Update for description field, new features

- add autosize (height) for description textarea, new plugin
- set max description length to 512 symbols
- update locales

* Fix migration - typo in var

* Update repo description behaviour

- add textarea autosize for /repo/create
- add symbols counter under description testarea (create/edit)

* Fix function definition - it a var

* Revert ru-RU locale

* Update by review

- Use type `varchar(512)` in migration
- Remove unused files from autosize plugin

* Fix migration - new project paths

* Fixes after review 2

- copyright year
- format includes
- use switch instead of multi-if

* Remove unused `default:` option.

1 files changed, 34 insertions, 0 deletions

diff --git a/models/migrations/v18.go b/models/migrations/v18.go
new file mode 100644
index 00000000..086cd27a
--- /dev/null
+++ b/models/migrations/v18.go
@@ -0,0 +1,34 @@
+// Copyright 2018 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"fmt"
+
+	"github.com/go-xorm/xorm"
+
+	"github.com/gogs/gogs/pkg/setting"
+)
+
+func updateRepositoryDescriptionField(x *xorm.Engine) error {
+	exist, err := x.IsTableExist("repository")
+	if err != nil {
+		return fmt.Errorf("IsTableExist: %v", err)
+	} else if !exist {
+		return nil
+	}
+	switch {
+		case setting.UseMySQL:
+			_, err = x.Exec("ALTER TABLE `repository` MODIFY `description` VARCHAR(512);")
+		case setting.UseMSSQL:
+			_, err = x.Exec("ALTER TABLE `repository` ALTER COLUMN `description` VARCHAR(512);")
+		case setting.UsePostgreSQL:
+			_, err = x.Exec("ALTER TABLE `repository` ALTER COLUMN `description` TYPE VARCHAR(512);")
+		case setting.UseSQLite3:
+			// Sqlite3 uses TEXT type by default for any string type field.
+			// Keep this comment to mention that we don't missed any option.
+	}
+	return err
+}