*: update README and Makefile

Makefile

@@ -1,18 +1,18 @@
-.PHONY: all kl shen esc
+.PHONY: all kl shen esc generate
 
 all: shen kl
 
-generate:
+generate: esc
 	${GOPATH}/bin/esc -o vm/asset.go -pkg=vm bytecode
 
 esc: ${GOPATH}/bin/esc
-	go get github.com/mjibson/esc
+	go get -u -v github.com/mjibson/esc
 
 kl:
 	go install github.com/tiancaiamao/shen-go/cmd/kl
 
 shen:
-	go install github.com/tiancaiamao/shen-go/cmd/shen
+	go build -o shen cmd/shen/main.go
 
 test:
 	go test github.com/tiancaiamao/shen-go/vm

README.md

@@ -12,31 +12,62 @@ Shen is a portable functional programming language by [Mark Tarver](http://markt
 
 shen-go is a port of the Shen language that runs on top of Go implementations.
 
-There is a klambda interpreter that is available, but it's quite slow. Right now I'm working on a bytecode compiler.
-
 ## Building
 
 Make sure you have [Go installed](https://golang.org/doc/install).
 
 ```
-go get github.com/tiancaiamao/shen-go/cmd/kl
+make shen
 ```
 
 ## Running
 
 ```
-$GOPATH/bin/kl -shen
+./shen
 ```
 
+This binary has no dependency, you can move it to any where you want.
+
 ## Testing
 
 ```
-cd $GOPATH/src/github.com/tiancaiamao/shen-go/ShenOSKernel-20.1/tests
-$GOPATH/bin/kl -shen
+cd ShenOSKernel-20.1/tests
+../../shen
 (load "README.shen")
 (load "tests.shen")
 ```
 
+## Bootstrap from scratch
+
+Run shen repl, then
+
+```
+(load "compiler/primitive.shen")
+```
+
+This would compile all necessary shen files into bytecode.
+
+Move the `.bc` files to bytecode directory
+
+```
+mv ShenOSKernel-20.1/sources/*.bc bytecode/
+mv compiler/*.bc bytecode/
+```
+
+And try it with
+
+```
+./shen -boot=true
+```
+
+If everything is ok, you can embedded those bytecode files into `asset.go`
+
+```
+make generate
+```
+
+And make shen again to get the new binary.
+
 ## Learn Shen
 * [Official website of Shen](http://shenlanguage.org/)
 * [The Shen OS Kernel Manual](http://shenlanguage.org/learn-shen/index.html)