2009-10-30 11:58:53 -06:00
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// godoc: Go Documentation Server
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// Web server tree:
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//
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// http://godoc/ main landing page
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// http://godoc/doc/ serve from $GOROOT/doc - spec, mem, tutorial, etc.
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// http://godoc/src/ serve files from $GOROOT/src; .go gets pretty-printed
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// http://godoc/cmd/ serve documentation about commands
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// http://godoc/pkg/ serve documentation about packages
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// (idea is if you say import "compress/zlib", you go to
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// http://godoc/pkg/compress/zlib)
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//
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// Command-line interface:
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//
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// godoc packagepath [name ...]
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//
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// godoc compress/zlib
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// - prints doc for package compress/zlib
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// godoc crypto/block Cipher NewCMAC
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// - prints doc for Cipher and NewCMAC in package crypto/block
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package main
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import (
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"bytes"
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_ "expvar" // to serve /debug/vars
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"flag"
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"fmt"
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"go/ast"
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"http"
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_ "http/pprof" // to serve /debug/pprof/*
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"io"
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"log"
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"os"
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pathutil "path"
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"regexp"
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"runtime"
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"strings"
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"time"
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)
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2010-03-24 15:51:55 -06:00
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const defaultAddr = ":6060" // default webserver address
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var (
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// periodic sync
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syncCmd = flag.String("sync", "", "sync command; disabled if empty")
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syncMin = flag.Int("sync_minutes", 0, "sync interval in minutes; disabled if <= 0")
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syncDelay delayTime // actual sync delay in minutes; usually syncDelay == syncMin, but delay may back off exponentially
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// network
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httpAddr = flag.String("http", "", "HTTP service address (e.g., '"+defaultAddr+"')")
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serverAddr = flag.String("server", "", "webserver address for command line searches")
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// layout control
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html = flag.Bool("html", false, "print HTML in command-line mode")
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srcMode = flag.Bool("src", false, "print (exported) source in command-line mode")
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// command-line searches
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query = flag.Bool("q", false, "arguments are considered search queries")
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)
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2010-02-18 18:40:50 -07:00
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func serveError(c *http.Conn, r *http.Request, relpath string, err os.Error) {
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contents := applyTemplate(errorHTML, "errorHTML", err) // err may contain an absolute path!
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servePage(c, "File "+relpath, "", "", contents)
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}
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func exec(c *http.Conn, args []string) (status int) {
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r, w, err := os.Pipe()
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if err != nil {
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log.Stderrf("os.Pipe(): %v\n", err)
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return 2
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}
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bin := args[0]
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fds := []*os.File{nil, w, w}
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if *verbose {
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log.Stderrf("executing %v", args)
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}
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pid, err := os.ForkExec(bin, args, os.Environ(), *goroot, fds)
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defer r.Close()
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w.Close()
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if err != nil {
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log.Stderrf("os.ForkExec(%q): %v\n", bin, err)
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return 2
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}
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var buf bytes.Buffer
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io.Copy(&buf, r)
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wait, err := os.Wait(pid, 0)
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if err != nil {
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os.Stderr.Write(buf.Bytes())
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log.Stderrf("os.Wait(%d, 0): %v\n", pid, err)
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return 2
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}
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status = wait.ExitStatus()
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if !wait.Exited() || status > 1 {
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os.Stderr.Write(buf.Bytes())
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log.Stderrf("executing %v failed (exit status = %d)", args, status)
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return
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}
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if *verbose {
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os.Stderr.Write(buf.Bytes())
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}
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if c != nil {
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c.SetHeader("content-type", "text/plain; charset=utf-8")
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c.Write(buf.Bytes())
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}
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2009-12-15 16:33:31 -07:00
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return
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}
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2009-11-03 20:40:26 -07:00
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// Maximum directory depth, adjust as needed.
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const maxDirDepth = 24
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func dosync(c *http.Conn, r *http.Request) {
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args := []string{"/bin/sh", "-c", *syncCmd}
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switch exec(c, args) {
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case 0:
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// sync succeeded and some files have changed;
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// update package tree.
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// TODO(gri): The directory tree may be temporarily out-of-sync.
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// Consider keeping separate time stamps so the web-
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// page can indicate this discrepancy.
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fsTree.set(newDirectory(*goroot, maxDirDepth))
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fallthrough
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case 1:
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// sync failed because no files changed;
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// don't change the package tree
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syncDelay.set(*syncMin) // revert to regular sync schedule
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default:
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// sync failed because of an error - back off exponentially, but try at least once a day
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syncDelay.backoff(24 * 60)
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}
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}
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func usage() {
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fmt.Fprintf(os.Stderr,
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"usage: godoc package [name ...]\n"+
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" godoc -http="+defaultAddr+"\n")
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flag.PrintDefaults()
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os.Exit(2)
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}
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func loggingHandler(h http.Handler) http.Handler {
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return http.HandlerFunc(func(c *http.Conn, req *http.Request) {
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log.Stderrf("%s\t%s", c.RemoteAddr, req.URL)
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h.ServeHTTP(c, req)
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})
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}
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func remoteSearch(query string) (res *http.Response, err os.Error) {
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search := "/search?f=text&q=" + http.URLEscape(query)
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// list of addresses to try
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var addrs []string
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if *serverAddr != "" {
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// explicit server address - only try this one
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addrs = []string{*serverAddr}
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} else {
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addrs = []string{
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defaultAddr,
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"golang.org",
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}
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}
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// remote search
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for _, addr := range addrs {
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url := "http://" + addr + search
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res, _, err = http.Get(url)
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if err == nil && res.StatusCode == http.StatusOK {
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break
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}
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}
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if err == nil && res.StatusCode != http.StatusOK {
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err = os.NewError(res.Status)
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}
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return
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}
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2010-03-29 19:06:53 -06:00
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// Does s look like a regular expression?
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func isRegexp(s string) bool {
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return strings.IndexAny(s, ".(|)*+?^$[]") >= 0
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}
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// Make a regular expression of the form
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// names[0]|names[1]|...names[len(names)-1].
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// Returns nil if the regular expression is illegal.
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func makeRx(names []string) (rx *regexp.Regexp) {
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if len(names) > 0 {
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s := ""
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for i, name := range names {
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if i > 0 {
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s += "|"
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}
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if isRegexp(name) {
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s += name
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} else {
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s += "^" + name + "$" // must match exactly
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}
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}
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rx, _ = regexp.Compile(s) // rx is nil if there's a compilation error
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}
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return
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}
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func main() {
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flag.Usage = usage
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flag.Parse()
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2009-11-09 00:42:00 -07:00
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// Check usage: either server and no args, or command line and args
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if (*httpAddr != "") != (flag.NArg() == 0) {
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usage()
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}
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if *tabwidth < 0 {
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log.Exitf("negative tabwidth %d", *tabwidth)
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}
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2010-02-16 13:49:41 -07:00
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initHandlers()
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readTemplates()
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if *httpAddr != "" {
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// HTTP server mode.
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var handler http.Handler = http.DefaultServeMux
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if *verbose {
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log.Stderrf("Go Documentation Server\n")
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log.Stderrf("version = %s\n", runtime.Version())
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log.Stderrf("address = %s\n", *httpAddr)
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log.Stderrf("goroot = %s\n", *goroot)
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log.Stderrf("tabwidth = %d\n", *tabwidth)
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if !fsMap.IsEmpty() {
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log.Stderr("user-defined mapping:")
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fsMap.Fprint(os.Stderr)
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}
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handler = loggingHandler(handler)
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}
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registerPublicHandlers(http.DefaultServeMux)
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if *syncCmd != "" {
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http.Handle("/debug/sync", http.HandlerFunc(dosync))
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}
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2009-11-03 20:40:26 -07:00
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// Initialize directory tree with corresponding timestamp.
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// Do it in two steps:
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// 1) set timestamp right away so that the indexer is kicked on
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fsTree.set(nil)
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// 2) compute initial directory tree in a goroutine so that launch is quick
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go func() { fsTree.set(newDirectory(*goroot, maxDirDepth)) }()
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// Start sync goroutine, if enabled.
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if *syncCmd != "" && *syncMin > 0 {
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syncDelay.set(*syncMin) // initial sync delay
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go func() {
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for {
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dosync(nil, nil)
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delay, _ := syncDelay.get()
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if *verbose {
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log.Stderrf("next sync in %dmin", delay.(int))
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}
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time.Sleep(int64(delay.(int)) * 60e9)
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}
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}()
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}
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// Start indexing goroutine.
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go indexer()
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// Start http server.
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if err := http.ListenAndServe(*httpAddr, handler); err != nil {
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log.Exitf("ListenAndServe %s: %v", *httpAddr, err)
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|
}
|
2010-03-19 13:46:43 -06:00
|
|
|
|
2009-12-15 16:33:31 -07:00
|
|
|
return
|
2009-10-30 11:58:53 -06:00
|
|
|
}
|
|
|
|
|
2009-11-02 10:25:39 -07:00
|
|
|
// Command line mode.
|
2009-10-30 11:58:53 -06:00
|
|
|
if *html {
|
2009-12-01 10:15:05 -07:00
|
|
|
packageText = packageHTML
|
2010-03-19 13:46:43 -06:00
|
|
|
searchText = packageHTML
|
|
|
|
}
|
|
|
|
|
|
|
|
if *query {
|
|
|
|
// Command-line queries.
|
|
|
|
for i := 0; i < flag.NArg(); i++ {
|
2010-03-24 15:51:55 -06:00
|
|
|
res, err := remoteSearch(flag.Arg(i))
|
2010-03-19 13:46:43 -06:00
|
|
|
if err != nil {
|
2010-03-24 15:51:55 -06:00
|
|
|
log.Exitf("remoteSearch: %s", err)
|
2010-03-19 13:46:43 -06:00
|
|
|
}
|
2010-03-24 15:51:55 -06:00
|
|
|
io.Copy(os.Stdout, res.Body)
|
2010-03-19 13:46:43 -06:00
|
|
|
}
|
|
|
|
return
|
2009-10-30 11:58:53 -06:00
|
|
|
}
|
|
|
|
|
2010-02-19 17:23:19 -07:00
|
|
|
// determine paths
|
|
|
|
path := flag.Arg(0)
|
|
|
|
if len(path) > 0 && path[0] == '.' {
|
|
|
|
// assume cwd; don't assume -goroot
|
|
|
|
cwd, _ := os.Getwd() // ignore errors
|
|
|
|
path = pathutil.Join(cwd, path)
|
|
|
|
}
|
|
|
|
relpath := path
|
|
|
|
abspath := path
|
|
|
|
if len(path) > 0 && path[0] != '/' {
|
|
|
|
abspath = absolutePath(path, pkgHandler.fsRoot)
|
|
|
|
} else {
|
|
|
|
relpath = relativePath(path)
|
|
|
|
}
|
|
|
|
|
2010-03-29 19:06:53 -06:00
|
|
|
var mode PageInfoMode
|
|
|
|
if *srcMode {
|
|
|
|
// only filter exports if we don't have explicit command-line filter arguments
|
|
|
|
if flag.NArg() == 1 {
|
|
|
|
mode |= exportsOnly
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
mode = exportsOnly | genDoc
|
|
|
|
}
|
2010-03-12 19:16:21 -07:00
|
|
|
// TODO(gri): Provide a mechanism (flag?) to select a package
|
|
|
|
// if there are multiple packages in a directory.
|
2010-03-29 19:06:53 -06:00
|
|
|
info := pkgHandler.getPageInfo(abspath, relpath, "", mode|tryMode)
|
2009-11-03 20:40:26 -07:00
|
|
|
|
2010-03-10 16:22:22 -07:00
|
|
|
if info.PAst == nil && info.PDoc == nil && info.Dirs == nil {
|
2009-11-03 20:40:26 -07:00
|
|
|
// try again, this time assume it's a command
|
2010-02-19 17:23:19 -07:00
|
|
|
if len(path) > 0 && path[0] != '/' {
|
|
|
|
abspath = absolutePath(path, cmdHandler.fsRoot)
|
|
|
|
}
|
2010-03-29 19:06:53 -06:00
|
|
|
info = cmdHandler.getPageInfo(abspath, relpath, "", mode)
|
2009-11-03 20:40:26 -07:00
|
|
|
}
|
2009-10-30 11:58:53 -06:00
|
|
|
|
2010-03-29 19:06:53 -06:00
|
|
|
// If we have more than one argument, use the remaining arguments for filtering
|
|
|
|
if flag.NArg() > 1 {
|
|
|
|
args := flag.Args()[1:]
|
|
|
|
rx := makeRx(args)
|
|
|
|
if rx == nil {
|
|
|
|
log.Exitf("illegal regular expression from %v", args)
|
|
|
|
}
|
|
|
|
|
|
|
|
filter := func(s string) bool { return rx.MatchString(s) }
|
|
|
|
switch {
|
|
|
|
case info.PAst != nil:
|
|
|
|
ast.FilterFile(info.PAst, filter)
|
2010-03-30 12:19:58 -06:00
|
|
|
// Special case: Don't use templates for printing
|
|
|
|
// so we only get the filtered declarations without
|
|
|
|
// package clause or extra whitespace.
|
|
|
|
for i, d := range info.PAst.Decls {
|
|
|
|
if i > 0 {
|
|
|
|
fmt.Println()
|
|
|
|
}
|
|
|
|
writeAny(os.Stdout, d, *html)
|
|
|
|
fmt.Println()
|
|
|
|
}
|
|
|
|
return
|
|
|
|
|
2010-03-29 19:06:53 -06:00
|
|
|
case info.PDoc != nil:
|
|
|
|
info.PDoc.Filter(filter)
|
|
|
|
}
|
2009-10-30 11:58:53 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
if err := packageText.Execute(info, os.Stdout); err != nil {
|
2009-11-09 13:07:39 -07:00
|
|
|
log.Stderrf("packageText.Execute: %s", err)
|
2009-10-30 11:58:53 -06:00
|
|
|
}
|
|
|
|
}
|