added interpreters_map.go generation

fixed Interpreters comment

internal/code-generator/generator/interpreters.go

@@ -0,0 +1,54 @@
+package generator
+
+import (
+	"bytes"
+	"io"
+	"strings"
+	"text/template"
+
+	"gopkg.in/yaml.v2"
+)
+
+// Interpreters reads from buf and builds interpreters_map.go file from interpretersTmplPath.
+func Interpreters(data []byte, interpretersTmplPath, interpretersTmplName, commit string) ([]byte, error) {
+	languages := make(map[string]*languageInfo)
+	if err := yaml.Unmarshal(data, &languages); err != nil {
+		return nil, err
+	}
+
+	orderedKeys := getAlphabeticalOrderedKeys(languages)
+	languagesByInterpreter := buildInterpreterLanguagesMap(languages, orderedKeys)
+
+	buf := &bytes.Buffer{}
+	if err := executeInterpretersTemplate(buf, languagesByInterpreter, interpretersTmplPath, interpretersTmplName, commit); err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+func buildInterpreterLanguagesMap(languages map[string]*languageInfo, orderedKeys []string) map[string][]string {
+	interpreterLangsMap := make(map[string][]string)
+	for _, lang := range orderedKeys {
+		langInfo := languages[lang]
+		for _, interpreter := range langInfo.Interpreters {
+			interpreterLangsMap[interpreter] = append(interpreterLangsMap[interpreter], lang)
+		}
+	}
+
+	return interpreterLangsMap
+}
+
+func executeInterpretersTemplate(out io.Writer, languagesByInterpreter map[string][]string, interpretersTmplPath, interpretersTmpl, commit string) error {
+	fmap := template.FuncMap{
+		"getCommit":         func() string { return commit },
+		"formatStringSlice": func(slice []string) string { return `"` + strings.Join(slice, `","`) + `"` },
+	}
+
+	t := template.Must(template.New(interpretersTmpl).Funcs(fmap).ParseFiles(interpretersTmplPath))
+	if err := t.Execute(out, languagesByInterpreter); err != nil {
+		return err
+	}
+
+	return nil
+}