add readme.txt support

handler.go

@@ -3,10 +3,12 @@ package main
 import (
 	"fmt"
 	"html/template"
+	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
 	"path"
+	"path/filepath"
 	"sort"
 	"strings"
 )
@@ -58,7 +60,6 @@ func toHTTPError(err error) (msg string, httpStatus int) {
 }
 
 func serveFile(w http.ResponseWriter, r *http.Request, fs http.FileSystem, name string) {
-
 	f, err := fs.Open(name)
 	if err != nil {
 		msg, code := toHTTPError(err)
@@ -85,7 +86,7 @@ func serveFile(w http.ResponseWriter, r *http.Request, fs http.FileSystem, name
 
 	// Still a directory? (we didn't find an index.html file)
 	if d.IsDir() {
-		dirList(w, r, f, name)
+		dirList(w, r, f, name, fs)
 		return
 	}
 
@@ -94,7 +95,7 @@ func serveFile(w http.ResponseWriter, r *http.Request, fs http.FileSystem, name
 	http.ServeContent(w, r, d.Name(), d.ModTime(), f)
 }
 
-func dirList(w http.ResponseWriter, r *http.Request, f http.File, name string) {
+func dirList(w http.ResponseWriter, r *http.Request, f http.File, name string, fs http.FileSystem) {
 	dirs, err := f.Readdir(-1)
 	if err != nil {
 		renderError(w, "Error reading directory", http.StatusInternalServerError)
@@ -119,6 +120,7 @@ func dirList(w http.ResponseWriter, r *http.Request, f http.File, name string) {
 		Title:  name,
 		IsRoot: name == "/",
 		Files:  make([]*File, 0, len(dirs)),
+		Readme: loadReadmeFile(name, fs),
 	}
 
 	for _, d := range dirs {
@@ -150,6 +152,19 @@ func dirList(w http.ResponseWriter, r *http.Request, f http.File, name string) {
 
 }
 
+func loadReadmeFile(path string, fs http.FileSystem) string {
+	f, err := fs.Open(filepath.Join(path, "readme.txt"))
+	if err != nil {
+		return ""
+	}
+
+	defer f.Close()
+
+	data, err := ioutil.ReadAll(f)
+
+	return string(data)
+}
+
 type fileHandler struct {
 	root string
 }

main.html

@@ -50,6 +50,20 @@
                 </tr>
                 {{end}}
             </table>
+
+            {{if .Readme}}
+            <div class="card">
+                <div class="card-header">
+                    readme.txt
+                </div>
+                    <div class="card-body">
+                        <p class="card-text">{{.Readme}}</p>
+                    </div>
+            </div>
+
+            <br>
+            {{end}}
+
             <div class="alert alert-primary" role="alert">
                 <small>By dedal.qq (c) 2018</small>
             </div>

struct.go

@@ -14,4 +14,5 @@ type Data struct {
 	Title  string
 	IsRoot bool
 	Files  []*File
+	Readme string
 }