M main.go → main.go

@@ -9,10 +9,12 @@ "github.com/gorilla/sessions"
 	"io"
 	"io/ioutil"
 	"log"
+	"mime"
 	"os"
 	"path"
 	"path/filepath"
 	"sort"
+	"strings"
 	"sync"
 	"time"
 )
@@ -24,6 +26,7 @@ Creator     string
 	Name        string
 	UpdatedTime time.Time
 	TimeAgo     string
+	IsText      bool
 }
 
 type User struct {
@@ -107,10 +110,12 @@ if err != nil {
 		return nil, err
 	}
 	for _, file := range files {
+		isText := strings.HasPrefix(mime.TypeByExtension(path.Ext(file.Name())), "text")
 		result = append(result, &File{
 			Name:        file.Name(),
 			Creator:     user,
 			UpdatedTime: file.ModTime(),
+			IsText:      isText,
 		})
 	}
 	return result, nil

M templates/my_site.html → templates/my_site.html

@@ -12,7 +12,9 @@ {{ range .Files }}
 <div>
   <a href="//{{$authUser}}.{{$domain}}/{{.Name}}">
       {{ .Name }}</a>
+  {{ if .IsText }}
   <a href="/edit/{{.Name}}">edit</a>
+  {{ end }}
   <form action="/delete/{{.Name}}" method="POST" class="inline">
     <input
       class="button delete"