wiki article: remove "flag" import from the code

When reading along the article, the extra code added in the final
version is not explained. The main function calls flag.Parse(), for
example, which will cause an error, unless the readers looks at the
entirety of final.go to see the import added.

The file shown to the users no longer has the extra flags. The testing
code is now in a patch that gets applied to final.go in order to create
final-test.go. This is the file that will be used to test the code,
matching final.go as much as possible.

Change-Id: I022f5f6c88e107c8ba5623661d74a8d260d05266
Reviewed-on: https://go-review.googlesource.com/11061Reviewed-by: Andrew Gerrand <adg@golang.org>

doc/articles/wiki/final-test.patch

+*** final.go	2015-06-14 23:59:22.000000000 +0200
+--- final-test.go	2015-06-15 00:15:41.000000000 +0200
+***************
+*** 7,12 ****
+--- 7,14 ----
+  import (
+  	"html/template"
+  	"io/ioutil"
++ 	"log"
++ 	"net"
+  	"net/http"
+  	"regexp"
+  )
+***************
+*** 85,89 ****
+  	http.HandleFunc("/edit/", makeHandler(editHandler))
+  	http.HandleFunc("/save/", makeHandler(saveHandler))
+  
+! 	http.ListenAndServe(":8080", nil)
+  }
+--- 87,101 ----
+  	http.HandleFunc("/edit/", makeHandler(editHandler))
+  	http.HandleFunc("/save/", makeHandler(saveHandler))
+  
+! 	l, err := net.Listen("tcp", "127.0.0.1:0")
+! 	if err != nil {
+! 		log.Fatal(err)
+! 	}
+! 	err = ioutil.WriteFile("final-test-port.txt", []byte(l.Addr().String()), 0644)
+! 	if err != nil {
+! 		log.Fatal(err)
+! 	}
+! 	s := &http.Server{}
+! 	s.Serve(l)
+! 	return
+  }

doc/articles/wiki/final.go

@@ -5,19 +5,12 @@
 package main
 
 import (
-	"flag"
 	"html/template"
 	"io/ioutil"
-	"log"
-	"net"
 	"net/http"
 	"regexp"
 )
 
-var (
-	addr = flag.Bool("addr", false, "find open address and print to final-port.txt")
-)
-
 type Page struct {
 	Title string
 	Body  []byte
@@ -88,24 +81,9 @@ func makeHandler(fn func(http.ResponseWriter, *http.Request, string)) http.Handl
 }
 
 func main() {
-	flag.Parse()
 	http.HandleFunc("/view/", makeHandler(viewHandler))
 	http.HandleFunc("/edit/", makeHandler(editHandler))
 	http.HandleFunc("/save/", makeHandler(saveHandler))
 
-	if *addr {
-		l, err := net.Listen("tcp", "127.0.0.1:0")
-		if err != nil {
-			log.Fatal(err)
-		}
-		err = ioutil.WriteFile("final-port.txt", []byte(l.Addr().String()), 0644)
-		if err != nil {
-			log.Fatal(err)
-		}
-		s := &http.Server{}
-		s.Serve(l)
-		return
-	}
-
 	http.ListenAndServe(":8080", nil)
 }

doc/articles/wiki/test.bash

@@ -7,11 +7,11 @@ set -e
 wiki_pid=
 cleanup() {
 	kill $wiki_pid
-	rm -f test_*.out Test.txt final.bin final-port.txt a.out get.bin
+	rm -f test_*.out Test.txt final-test.bin final-test-port.txt a.out get.bin
 }
 trap cleanup 0 INT
 
-rm -f get.bin final.bin a.out
+rm -f get.bin final-test.bin a.out
 
 # If called with -all, check that all code snippets compile.
 if [ "$1" == "-all" ]; then
@@ -21,12 +21,14 @@ if [ "$1" == "-all" ]; then
 fi
 
 go build -o get.bin get.go
-go build -o final.bin final.go
-(./final.bin --addr) &
+cp final.go final-test.go
+patch final-test.go final-test.patch > /dev/null
+go build -o final-test.bin final-test.go
+./final-test.bin &
 wiki_pid=$!
 
 l=0
-while [ ! -f ./final-port.txt ]
+while [ ! -f ./final-test-port.txt ]
 do
 	l=$(($l+1))
 	if [ "$l" -gt 5 ]
@@ -38,7 +40,7 @@ do
 	sleep 1
 done
 
-addr=$(cat final-port.txt)
+addr=$(cat final-test-port.txt)
 ./get.bin http://$addr/edit/Test > test_edit.out
 diff -u test_edit.out test_edit.good
 ./get.bin -post=body=some%20content http://$addr/save/Test > test_save.out