Added all the necessary to do GetLanguageByAlias functionality works

internal/code-generator/generator/aliases.go

@@ -0,0 +1,63 @@
+package generator
+
+import (
+	"bytes"
+	"io"
+	"text/template"
+
+	"strings"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+// Aliases reads from buf and builds aliases_map.go file from aliasesTmplPath.
+func Aliases(data []byte, aliasesTmplPath, aliasesTmplName, commit string) ([]byte, error) {
+	languages := make(map[string]*languageInfo)
+	if err := yaml.Unmarshal(data, &languages); err != nil {
+		return nil, err
+	}
+
+	orderedLangList := getAlphabeticalOrderedKeys(languages)
+	languagesByAlias := buildAliasLanguageMap(languages, orderedLangList)
+
+	buf := &bytes.Buffer{}
+	if err := executeAliasesTemplate(buf, languagesByAlias, aliasesTmplPath, aliasesTmplName, commit); err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+func buildAliasLanguageMap(languages map[string]*languageInfo, orderedLangList []string) map[string]string {
+	aliasLangsMap := make(map[string]string)
+	for _, lang := range orderedLangList {
+		langInfo := languages[lang]
+		key := convertToAliasKey(lang)
+		aliasLangsMap[key] = lang
+		for _, alias := range langInfo.Aliases {
+			key := convertToAliasKey(alias)
+			aliasLangsMap[key] = lang
+		}
+	}
+
+	return aliasLangsMap
+}
+
+func convertToAliasKey(s string) (key string) {
+	key = strings.Replace(s, ` `, `_`, -1)
+	key = strings.ToLower(key)
+	return
+}
+
+func executeAliasesTemplate(out io.Writer, languagesByAlias map[string]string, aliasesTmplPath, aliasesTmpl, commit string) error {
+	fmap := template.FuncMap{
+		"getCommit": func() string { return commit },
+	}
+
+	t := template.Must(template.New(aliasesTmpl).Funcs(fmap).ParseFiles(aliasesTmplPath))
+	if err := t.Execute(out, languagesByAlias); err != nil {
+		return err
+	}
+
+	return nil
+}