feat: implement snake2camel go module

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

tools/snake2camel/snake2camel.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"strings"
+)
+
+func exitWithError(msg string) {
+	err := fmt.Sprintf("error: %s\n", msg)
+	fmt.Fprintln(os.Stderr, err)
+	os.Exit(1)
+}
+
+func replaceAllStringSubmatchFunc(re *regexp.Regexp, str string, repl func([]string) string) (string, int) {
+	result := ""
+	lastIndex := 0
+
+	for _, v := range re.FindAllSubmatchIndex([]byte(str), -1) {
+		groups := []string{}
+		for i := 0; i < len(v); i += 2 {
+			if v[i] == -1 || v[i+1] == -1 {
+				groups = append(groups, "")
+			} else {
+				groups = append(groups, str[v[i]:v[i+1]])
+			}
+		}
+
+		result += str[lastIndex:v[0]] + repl(groups)
+		lastIndex = v[1]
+	}
+
+	return result + str[lastIndex:], lastIndex
+}
+
+func snake2camel(content []byte) []byte {
+	re := regexp.MustCompile(`(.*)([a-z]+[0-9]*)_([a-zA-Z0-9])(.*)`)
+	res := string(content)
+	last := -1
+
+	for last != 0 {
+		res, last = replaceAllStringSubmatchFunc(re, res, func(groups []string) string {
+			return groups[1] + groups[2] + strings.ToUpper(groups[3]) + groups[4]
+		})
+	}
+
+	return []byte(res)
+}
+
+func snake2camelFile(path string) error {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return err
+	}
+	updated := snake2camel(content)
+
+	return os.WriteFile(path, updated, 0)
+}
+
+func main() {
+	if len(os.Args) != 2 {
+		exitWithError("must be called with the file path as the only argument")
+	}
+	path := os.Args[1]
+	if err := snake2camelFile(path); err != nil {
+		exitWithError(err.Error())
+	}
+}