#1692 add CRUD issue APIs

- Fix go-gogs-client#10
- Related to #809

modules/context/api.go

@@ -5,10 +5,15 @@
 package context
 
 import (
+	"fmt"
+	"strings"
+
+	"github.com/Unknwon/paginater"
 	"gopkg.in/macaron.v1"
 
 	"github.com/gogits/gogs/modules/base"
 	"github.com/gogits/gogs/modules/log"
+	"github.com/gogits/gogs/modules/setting"
 )
 
 type APIContext struct {
@@ -35,6 +40,27 @@ func (ctx *APIContext) Error(status int, title string, obj interface{}) {
 	})
 }
 
+func (ctx *APIContext) SetLinkHeader(total, pageSize int) {
+	page := paginater.New(total, pageSize, ctx.QueryInt("page"), 0)
+	links := make([]string, 0, 4)
+	if page.HasNext() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"next\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.Next()))
+	}
+	if !page.IsLast() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"last\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.TotalPages()))
+	}
+	if !page.IsFirst() {
+		links = append(links, fmt.Sprintf("<%s%s?page=1>; rel=\"first\"", setting.AppUrl, ctx.Req.URL.Path[1:]))
+	}
+	if page.HasPrevious() {
+		links = append(links, fmt.Sprintf("<%s%s?page=%d>; rel=\"prev\"", setting.AppUrl, ctx.Req.URL.Path[1:], page.Previous()))
+	}
+
+	if len(links) > 0 {
+		ctx.Header().Set("Link", strings.Join(links, ","))
+	}
+}
+
 func APIContexter() macaron.Handler {
 	return func(c *Context) {
 		ctx := &APIContext{