code review 1008042: godoc: add codewalk support

src/cmd/godoc/godoc.go

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package main
 
 import (
         "bytes"
         "flag"
         "fmt"
@@ skipping 90 matching lines @@
         fsMap.Init(*path)
         fileServer = http.FileServer(*goroot, "")
         cmdHandler = httpHandler{"/cmd/", pathutil.Join(*goroot, "src/cmd"), false}
         pkgHandler = httpHandler{"/pkg/", pathutil.Join(*goroot, "src/pkg"), true}
 }
 
 
 func registerPublicHandlers(mux *http.ServeMux) {
         mux.Handle(cmdHandler.pattern, &cmdHandler)
         mux.Handle(pkgHandler.pattern, &pkgHandler)
-        mux.Handle("/search", http.HandlerFunc(search))
-        mux.Handle("/", http.HandlerFunc(serveFile))
+        mux.HandleFunc("/doc/codewalk/", codewalk)
+        mux.HandleFunc("/search", search)
+        mux.HandleFunc("/", serveFile)
 }
 
 
 // ----------------------------------------------------------------------------
 // Predicates and small utility functions
 
 func isGoFile(f *os.FileInfo) bool {
         return f.IsRegular() &&
                 !strings.HasPrefix(f.Name, ".") && // ignore .files
                 pathutil.Ext(f.Name) == ".go"
@@ skipping 719 matching lines @@
         }
         t, err := template.Parse(string(data), fmap)
         if err != nil {
                 log.Exitf("%s: %v", name, err)
         }
         return t
 }
 
 
 var (
+        codewalkHTML,
+        codewalkdirHTML,
         dirlistHTML,
         errorHTML,
         godocHTML,
         packageHTML,
         packageText,
         searchHTML,
         searchText,
         sourceHTML *template.Template
 )
 
 func readTemplates() {
         // have to delay until after flags processing since paths depend on goroot
+        codewalkHTML = readTemplate("codewalk.html")
+        codewalkdirHTML = readTemplate("codewalkdir.html")
         dirlistHTML = readTemplate("dirlist.html")
         errorHTML = readTemplate("error.html")
         godocHTML = readTemplate("godoc.html")
         packageHTML = readTemplate("package.html")
         packageText = readTemplate("package.txt")
         searchHTML = readTemplate("search.html")
         searchText = readTemplate("search.txt")
         sourceHTML = readTemplate("source.html")
 }
 
@@ skipping 533 matching lines @@
                                 nwords, nspots := index.Size()
                                 log.Stderrf("index updated (%gs, %d unique words, %d spots)", secs, nwords, nspots)
                         }
                         log.Stderrf("bytes=%d footprint=%d\n", runtime.MemStats.HeapAlloc, runtime.MemStats.Sys)
                         runtime.GC()
                         log.Stderrf("bytes=%d footprint=%d\n", runtime.MemStats.HeapAlloc, runtime.MemStats.Sys)
                 }
                 time.Sleep(1 * 60e9) // try once a minute
         }
 }