From 49d36e287d983f72b2b2b5d903fb3bf55a44b440 Mon Sep 17 00:00:00 2001
From: Jeff Carr <jcarr@wit.com>
Date: Thu, 13 Jun 2019 19:31:37 -0700
Subject: [PATCH] start handling stupid Windows

Signed-off-by: Jeff Carr <jcarr@wit.com>
---
 md5sum.go         | 35 +++++++++++++++++++++++++++++++++++
 shell.go          |  8 +++++---
 windowsWrapper.go | 10 ++++++++++
 3 files changed, 50 insertions(+), 3 deletions(-)
 create mode 100644 md5sum.go
 create mode 100644 windowsWrapper.go

diff --git a/md5sum.go b/md5sum.go
new file mode 100644
index 0000000..74ec106
--- /dev/null
+++ b/md5sum.go
@@ -0,0 +1,35 @@
+package shell
+
+import "crypto/md5"
+import "encoding/hex"
+import "log"
+import "io"
+import "os"
+
+func hash_file_md5(filePath string) (string, error) {
+	var returnMD5String string
+	file, err := os.Open(filePath)
+	if err != nil {
+		return returnMD5String, err
+	}
+	defer file.Close()
+	hash := md5.New()
+	if _, err := io.Copy(hash, file); err != nil {
+		return returnMD5String, err
+	}
+	hashInBytes := hash.Sum(nil)[:16]
+	returnMD5String = hex.EncodeToString(hashInBytes)
+	return returnMD5String, nil
+
+}
+
+// hash thyself:  hash_file_md5(os.Args[0])
+func Md5sum(filename string) string {
+	hash, err := hash_file_md5(filename)
+	if err == nil {
+		log.Println("shell.Md5sum() hash =", hash)
+		return hash
+	}
+	log.Println("shell.Md5sum() failed")
+	return ""
+}
diff --git a/shell.go b/shell.go
index 47ff9ed..ab8a695 100644
--- a/shell.go
+++ b/shell.go
@@ -13,7 +13,9 @@ import "io"
 import "github.com/davecgh/go-spew/spew"
 import "github.com/svent/go-nbreader"
 
+// import "log"
 import log "github.com/sirupsen/logrus"
+// TODO this journalhook to be cross platform
 // import "github.com/wercker/journalhook"
 
 // TODO: look at https://github.com/go-cmd/cmd/issues/20
@@ -24,9 +26,9 @@ var callback func(interface{}, int)
 var shellStdout *os.File
 var shellStderr *os.File
 
-var spewOn bool = false
-var quiet bool = false
-var msecDelay int = 20	// number of milliseconds to delay between reads with no data
+var spewOn      bool = false
+var quiet       bool = false
+var msecDelay   int  = 20	// number of milliseconds to delay between reads with no data
 
 var bytesBuffer bytes.Buffer
 var bytesSplice []byte
diff --git a/windowsWrapper.go b/windowsWrapper.go
new file mode 100644
index 0000000..a33bb8b
--- /dev/null
+++ b/windowsWrapper.go
@@ -0,0 +1,10 @@
+package shell
+
+import "runtime"
+
+func Execname(filename string) string {
+	if runtime.GOOS == "windows" {
+		return filename + ".exe"
+	}
+	return filename
+}