aefix: Update code using taskqueue.QueueStats.

Also drop the suggestion to use sed from the README.
Anyone desiring automation should use aefix instead.

Change-Id: I296056ce27400372751783db88e1a2eab102be5a

README.md

@@ -44,12 +44,6 @@ See https://cloud.google.com/appengine/docs/go/modules/#Go_Instance_scaling_and_
 The import paths for App Engine packages are now fully qualified, based at `google.golang.org/appengine`.
 You will need to update your code to use import paths starting with that; for instance,
 code importing `appengine/datastore` will now need to import `google.golang.org/appengine/datastore`.
-You can do that manually, or by running this command to recursively update all Go source files in the current directory:
-(may require GNU sed)
-```
-sed -i '/"appengine/{s,"appengine,"google.golang.org/appengine,;s,appengine_,appengine/,}' \
-  $(find . -name '*.go')
-```
 
 ### 3. Update code using deprecated, removed or modified APIs
 

cmd/aefix/ae.go

@@ -116,6 +116,11 @@ func aeFn(f *ast.File) bool {
 				fixed = true
 				return
 			}
+			if isPkgDot(call.Fun, "taskqueue", "QueueStats") && len(call.Args) == 3 {
+				call.Args = call.Args[:2] // drop last arg
+				fixed = true
+				return
+			}
 
 			sel, ok := call.Fun.(*ast.SelectorExpr)
 			if !ok {

cmd/aefix/ae_test.go

@@ -82,6 +82,35 @@ import (
 func LogSomething(c2 context.Context) {
 	log.Warningf(c2, "Stand back! I'm going to try science!")
 }
+`,
+	},
+
+	// Less widely used API changes:
+	//	- drop maxTasks arg to taskqueue.QueueStats
+	{
+		Name: "ae.2",
+		In: `package foo
+
+import (
+	"appengine"
+	"appengine/taskqueue"
+)
+
+func f(ctx appengine.Context) {
+	stats, err := taskqueue.QueueStats(ctx, []string{"one", "two"}, 0)
+}
+`,
+		Out: `package foo
+
+import (
+	"golang.org/x/net/context"
+	"google.golang.org/appengine"
+	"google.golang.org/appengine/taskqueue"
+)
+
+func f(ctx context.Context) {
+	stats, err := taskqueue.QueueStats(ctx, []string{"one", "two"})
+}
 `,
 	},
 }