1 files changed, 102 insertions, 0 deletions
diff --git a/deno_dir.go b/deno_dir.go
new file mode 100644
index 000000000..841288936
--- /dev/null
+++ b/deno_dir.go
@@ -0,0 +1,102 @@
+package main
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"github.com/ry/v8worker2"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path"
+	"runtime"
+	"strings"
+)
+
+func SourceCodeHash(filename string, sourceCodeBuf []byte) string {
+	h := md5.New()
+	h.Write([]byte(filename))
+	h.Write(sourceCodeBuf)
+	return hex.EncodeToString(h.Sum(nil))
+}
+
+func CacheFileName(filename string, sourceCodeBuf []byte) string {
+	cacheKey := SourceCodeHash(filename, sourceCodeBuf)
+	return path.Join(CompileDir, cacheKey+".js")
+}
+
+// Fetches a remoteUrl but also caches it to the localFilename.
+func FetchRemoteSource(remoteUrl string, localFilename string) ([]byte, error) {
+	//println("FetchRemoteSource", remoteUrl)
+	Assert(strings.HasPrefix(localFilename, SrcDir), localFilename)
+	var sourceReader io.Reader
+
+	file, err := os.Open(localFilename)
+	if *flagReload || os.IsNotExist(err) {
+		// Fetch from HTTP.
+		println("Downloading", remoteUrl)
+		res, err := http.Get(remoteUrl)
+		if err != nil {
+			return nil, err
+		}
+		defer res.Body.Close()
+
+		err = os.MkdirAll(path.Dir(localFilename), 0700)
+		if err != nil {
+			return nil, err
+		}
+
+		// Write to to file. Need to reopen it for writing.
+		file, err = os.OpenFile(localFilename, os.O_RDWR|os.O_CREATE, 0700)
+		if err != nil {
+			return nil, err
+		}
+		sourceReader = io.TeeReader(res.Body, file) // Fancy!
+
+	} else if err != nil {
+		return nil, err
+	} else {
+		sourceReader = file
+	}
+	defer file.Close()
+	return ioutil.ReadAll(sourceReader)
+}
+
+func LoadOutputCodeCache(filename string, sourceCodeBuf []byte) (outputCode string, err error) {
+	cacheFn := CacheFileName(filename, sourceCodeBuf)
+	outputCodeBuf, err := ioutil.ReadFile(cacheFn)
+	if os.IsNotExist(err) {
+		err = nil // Ignore error if we can't load the cache.
+	} else if err != nil {
+		outputCode = string(outputCodeBuf)
+	}
+	return
+}
+
+func UserHomeDir() string {
+	if runtime.GOOS == "windows" {
+		home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
+		if home == "" {
+			home = os.Getenv("USERPROFILE")
+		}
+		return home
+	}
+	return os.Getenv("HOME")
+}
+
+func loadAsset(w *v8worker2.Worker, path string) {
+	data, err := Asset(path)
+	check(err)
+	err = w.Load(path, string(data))
+	check(err)
+}
+
+func createDirs() {
+	DenoDir = path.Join(UserHomeDir(), ".deno")
+	CompileDir = path.Join(DenoDir, "compile")
+	err := os.MkdirAll(CompileDir, 0700)
+	check(err)
+	SrcDir = path.Join(DenoDir, "src")
+	err = os.MkdirAll(SrcDir, 0700)
+	check(err)
+}