Add units concept for modulable functions of a repository (#742)

* Add units concept for modulable functions of a repository

* remove unused comment codes & fix lints and tests

* remove unused comment codes

* use struct config instead of map

* fix lint

* rm wrong files

* fix tests

models/repo_unit.go

@@ -0,0 +1,137 @@
+// Copyright 2017 The Gitea 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 models
+
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/Unknwon/com"
+	"github.com/go-xorm/core"
+	"github.com/go-xorm/xorm"
+)
+
+// RepoUnit describes all units of a repository
+type RepoUnit struct {
+	ID          int64
+	RepoID      int64    `xorm:"INDEX(s)"`
+	Type        UnitType `xorm:"INDEX(s)"`
+	Index       int
+	Config      core.Conversion `xorm:"TEXT"`
+	CreatedUnix int64           `xorm:"INDEX CREATED"`
+	Created     time.Time       `xorm:"-"`
+}
+
+// UnitConfig describes common unit config
+type UnitConfig struct {
+}
+
+// FromDB fills up a UnitConfig from serialized format.
+func (cfg *UnitConfig) FromDB(bs []byte) error {
+	return json.Unmarshal(bs, &cfg)
+}
+
+// ToDB exports a UnitConfig to a serialized format.
+func (cfg *UnitConfig) ToDB() ([]byte, error) {
+	return json.Marshal(cfg)
+}
+
+// ExternalWikiConfig describes external wiki config
+type ExternalWikiConfig struct {
+	ExternalWikiURL string
+}
+
+// FromDB fills up a ExternalWikiConfig from serialized format.
+func (cfg *ExternalWikiConfig) FromDB(bs []byte) error {
+	return json.Unmarshal(bs, &cfg)
+}
+
+// ToDB exports a ExternalWikiConfig to a serialized format.
+func (cfg *ExternalWikiConfig) ToDB() ([]byte, error) {
+	return json.Marshal(cfg)
+}
+
+// ExternalTrackerConfig describes external tracker config
+type ExternalTrackerConfig struct {
+	ExternalTrackerURL    string
+	ExternalTrackerFormat string
+	ExternalTrackerStyle  string
+}
+
+// FromDB fills up a ExternalTrackerConfig from serialized format.
+func (cfg *ExternalTrackerConfig) FromDB(bs []byte) error {
+	return json.Unmarshal(bs, &cfg)
+}
+
+// ToDB exports a ExternalTrackerConfig to a serialized format.
+func (cfg *ExternalTrackerConfig) ToDB() ([]byte, error) {
+	return json.Marshal(cfg)
+}
+
+// BeforeSet is invoked from XORM before setting the value of a field of this object.
+func (r *RepoUnit) BeforeSet(colName string, val xorm.Cell) {
+	switch colName {
+	case "type":
+		switch UnitType(Cell2Int64(val)) {
+		case UnitTypeCode, UnitTypeIssues, UnitTypePullRequests, UnitTypeCommits, UnitTypeReleases,
+			UnitTypeWiki, UnitTypeSettings:
+			r.Config = new(UnitConfig)
+		case UnitTypeExternalWiki:
+			r.Config = new(ExternalWikiConfig)
+		case UnitTypeExternalTracker:
+			r.Config = new(ExternalTrackerConfig)
+		default:
+			panic("unrecognized repo unit type: " + com.ToStr(*val))
+		}
+	}
+}
+
+// AfterSet is invoked from XORM after setting the value of a field of this object.
+func (r *RepoUnit) AfterSet(colName string, _ xorm.Cell) {
+	switch colName {
+	case "created_unix":
+		r.Created = time.Unix(r.CreatedUnix, 0).Local()
+	}
+}
+
+// Unit returns Unit
+func (r *RepoUnit) Unit() Unit {
+	return Units[r.Type]
+}
+
+// CodeConfig returns config for UnitTypeCode
+func (r *RepoUnit) CodeConfig() *UnitConfig {
+	return r.Config.(*UnitConfig)
+}
+
+// IssuesConfig returns config for UnitTypeIssues
+func (r *RepoUnit) IssuesConfig() *UnitConfig {
+	return r.Config.(*UnitConfig)
+}
+
+// PullRequestsConfig returns config for UnitTypePullRequests
+func (r *RepoUnit) PullRequestsConfig() *UnitConfig {
+	return r.Config.(*UnitConfig)
+}
+
+// CommitsConfig returns config for UnitTypeCommits
+func (r *RepoUnit) CommitsConfig() *UnitConfig {
+	return r.Config.(*UnitConfig)
+}
+
+// ReleasesConfig returns config for UnitTypeReleases
+func (r *RepoUnit) ReleasesConfig() *UnitConfig {
+	return r.Config.(*UnitConfig)
+}
+
+// ExternalWikiConfig returns config for UnitTypeExternalWiki
+func (r *RepoUnit) ExternalWikiConfig() *ExternalWikiConfig {
+	return r.Config.(*ExternalWikiConfig)
+}
+
+// ExternalTrackerConfig returns config for UnitTypeExternalTracker
+func (r *RepoUnit) ExternalTrackerConfig() *ExternalTrackerConfig {
+	return r.Config.(*ExternalTrackerConfig)
+}