Automatizing blackbox with formula

If blackbox is set to auto, the blackbox functions are defined with the
formula.

 * main.go,
   tools/formulae.go : Here.

main.go

@@ -630,6 +630,9 @@ func main() {
 	}
 
 	if *ignorefunc != "" {
+		if *formulae == "" && len(flag.Args()) >= 2 && *ignorefunc == "auto" {
+			*ignorefunc = tools.Formuala(flag.Args()[0], flag.Args()[1])
+		}
 		var unspacify = regexp.MustCompile(` *`)
 		s := unspacify.ReplaceAllString(*ignorefunc, "")
 		toIgnore = strings.Split(s, ";")

tools/formulae.go

@@ -8,6 +8,31 @@ import (
 	"regexp"
 )
 
+func Formuala(inputfile, formula string) string {
+	src, err := ioutil.ReadFile(inputfile)
+	if err != nil {
+		fmt.Println(os.Stderr, err)
+		os.Exit(2)
+	}
+	callMap := BuildCallgraph(string(src))
+	neededFuncMap := make(map[string]bool)
+	for key, _ := range callMap {
+		neededFuncMap[key] = false
+	}
+	neededFuncMap["main"] = true
+	r, _ := regexp.Compile("\".*?\"")
+	parseFormulaeLine(formula, r, neededFuncMap)
+	notsameway := []string{}
+	callerNeeded("main", callMap, neededFuncMap, notsameway)
+	blackbox := ""
+	for key, val := range neededFuncMap {
+		if !val {
+			blackbox += key + ";"
+		}
+	}
+	return blackbox
+}
+
 func Formulae(inputfile, formulae string) string {
 	src, err := ioutil.ReadFile(inputfile)
 	if err != nil {