diff --git a/hello-world b/hello-world
new file mode 100755
index 000000000..f57b78595
Binary files /dev/null and b/hello-world differ
diff --git a/hello-world.go b/hello-world.go
index 4cc31296e..266916bd4 100644
--- a/hello-world.go
+++ b/hello-world.go
@@ -9,23 +9,74 @@ import (
   // "log"
   "os/exec"
   "os"
+  "strings"
+  "regexp"
 )
 
+func plus(a int, b int) int {
+  return a + b
+}
+
+// from https://gobyexample.com/collection-functions
+func Map(vs []string, f func(string) string) []string {
+    vsm := make([]string, len(vs))
+    for i, v := range vs {
+        vsm[i] = f(v)
+    }
+    return vsm
+}
+
+func sanitisedFileString(fileString string) string {
+  r := regexp.MustCompile("\\s| \\(new commits\\)|.* ")
+  fileString = r.ReplaceAllString(fileString, "")
+  return fileString
+}
+
+func filesByMatches(statusString string, targets []string) []string {
+  files := make([]string, 0)
+  for _, target := range targets {
+    if strings.Index(statusString, target) == -1 {
+      continue
+    }
+    r := regexp.MustCompile("(?s)" + target + ".*?\n\n(.*?)\n\n")
+    fmt.Println(r)
+
+    matchedFileStrings := strings.Split(r.FindStringSubmatch(statusString)[1], "\n")
+    // fmt.Println(matchedFileStrings)
+
+    matchedFiles := Map(matchedFileStrings, sanitisedFileString)
+    // fmt.Println(matchedFiles)
+    files = append(files, matchedFiles...)
+
+  }
+  fmt.Println(files)
+  return files
+}
+
+func filesToStage(statusString string) []string {
+  targets := []string{"Changes not staged for commit:", "Untracked files:"}
+  return filesByMatches(statusString, targets)
+}
+
+func runCommand(cmd string) (string, error) {
+  splitCmd := strings.Split(cmd, " ")
+  fmt.Println(splitCmd)
+
+  cmdOut, err := exec.Command(splitCmd[0], splitCmd[1:]...).Output()
+
+  // if err != nil {
+  //   os.Exit(1)
+  // }
+
+  return string(cmdOut), err
+}
+
 func main() {
 
-  var (
-    cmdOut []byte
-    err    error
-  )
-  cmdName := "git"
-  cmdArgs := []string{"rev-parse", "--verify", "HEAD"}
-  if cmdOut, err = exec.Command(cmdName, cmdArgs...).Output(); err != nil {
-    fmt.Fprintln(os.Stderr, "There was an error running git rev-parse command: ", err)
-    fmt.Println(string(cmdOut))
-    os.Exit(1)
-  }
-  sha := string(cmdOut)
-  firstSix := sha[:6]
-  fmt.Println("The first six chars of the SHA at HEAD in this repo are", firstSix)
+  statusString, _ := runCommand("git status")
+  fmt.Println(filesToStage(statusString))
+
 
 }
+
+