remove escLocalFS (google#150)

* remove escLocalFS

* update README

README.md

@@ -39,7 +39,6 @@ http://clipperhouse.github.io/gen/.  Do the following to regenerate these if
 necessary:
 
 ```
-go get github.com/mjibson/esc
 go get github.com/clipperhouse/gen
 go get github.com/clipperhouse/set
 export PATH=$PATH:$GOPATH/bin  # If you haven't already

builtins.go

@@ -27,13 +27,6 @@ import (
 	"github.com/google/go-jsonnet/ast"
 )
 
-// TODO(sbarzowski) Is this the best option? It's the first one that worked for me...
-//go:generate esc -o std.go -pkg=jsonnet std/std.jsonnet
-//go:generate go run cmd/dumpstdlibast.go
-func GetStdCode() string {
-	return FSMustString(false, "/std/std.jsonnet")
-}
-
 func builtinPlus(e *evaluator, xp, yp potentialValue) (value, error) {
 	// TODO(sbarzowski) more types, mixing types
 	// TODO(sbarzowski) perhaps a more elegant way to dispatch

cmd/dumpstdlibast.go

@@ -14,6 +14,7 @@ limitations under the License.
 package main
 
 import (
+	"io/ioutil"
 	"os"
 
 	"github.com/google/go-jsonnet"
@@ -23,13 +24,18 @@ import (
 func main() {
 	filename := "ast/stdast.go"
 
-	file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE,0644)
+	file, err := os.OpenFile(filename, os.O_RDWR|os.O_CREATE, 0644)
 	if err != nil {
 		panic(err)
 	}
 	defer file.Close()
 
-	node, err := jsonnet.SnippetToAST("<std>", jsonnet.GetStdCode())
+	buf, err := ioutil.ReadFile("std/std.jsonnet")
+	if err != nil {
+		panic(err)
+	}
+
+	node, err := jsonnet.SnippetToAST("<std>", string(buf))
 	if err != nil {
 		panic(err)
 	}