refactor: move templating functions to another file

pkg/parser/parser.go

@@ -1,7 +1,6 @@
 package parser
 
 import (
-	"bytes"
 	"encoding/json"
 	"fmt"
 	"maps"
@@ -12,9 +11,7 @@ import (
 	"regexp"
 	"sort"
 	"strings"
-	"text/template"
 
-	"github.com/Masterminds/sprig/v3"
 	"github.com/rs/zerolog/log"
 
 	"github.com/tgagor/template-dockerfiles/pkg/cmd"
@@ -358,37 +355,6 @@ func templateLabels(labelTemplates map[string]string, configSet map[string]inter
 	return labels, nil
 }
 
-func templateString(pattern string, args map[string]interface{}) (string, error) {
-	var output bytes.Buffer
-	t := template.Must(template.New(pattern).Funcs(sprig.TxtFuncMap()).Parse(pattern))
-	if err := t.Execute(&output, args); err != nil {
-		return "", err
-	}
-
-	return output.String(), nil
-}
-
-func templateFile(templateFile string, destinationFile string, args map[string]interface{}) error {
-	t := template.Must(
-		template.New(filepath.Base(templateFile)).Funcs(sprig.TxtFuncMap()).ParseFiles(templateFile),
-	)
-
-	f, err := os.Create(destinationFile)
-	if err != nil {
-		log.Error().Err(err).Str("file", templateFile).Msg("Failed to create")
-		return err
-	}
-	defer f.Close()
-
-	// Render templates using variables
-	if err := t.Execute(f, args); err != nil {
-		log.Error().Err(err).Str("file", templateFile).Msg("Failed to template")
-		return err
-	}
-
-	return nil
-}
-
 func sanitizeForFileName(input string) string {
 	// Replace any character that is not a letter, number, or safe symbol (-, _) with an underscore
 	reg := regexp.MustCompile(`[^a-zA-Z0-9-_\.]+`)

pkg/parser/template.go

@@ -0,0 +1,42 @@
+package parser
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"text/template"
+
+	"github.com/Masterminds/sprig/v3"
+	"github.com/rs/zerolog/log"
+)
+
+func templateString(pattern string, args map[string]interface{}) (string, error) {
+	var output bytes.Buffer
+	t := template.Must(template.New(pattern).Funcs(sprig.TxtFuncMap()).Parse(pattern))
+	if err := t.Execute(&output, args); err != nil {
+		return "", err
+	}
+
+	return output.String(), nil
+}
+
+func templateFile(templateFile string, destinationFile string, args map[string]interface{}) error {
+	t := template.Must(
+		template.New(filepath.Base(templateFile)).Funcs(sprig.TxtFuncMap()).ParseFiles(templateFile),
+	)
+
+	f, err := os.Create(destinationFile)
+	if err != nil {
+		log.Error().Err(err).Str("file", templateFile).Msg("Failed to create")
+		return err
+	}
+	defer f.Close()
+
+	// Render templates using variables
+	if err := t.Execute(f, args); err != nil {
+		log.Error().Err(err).Str("file", templateFile).Msg("Failed to template")
+		return err
+	}
+
+	return nil
+}