Adding lower, upper and title functions

Author: Ivan De Marino

README.md

@@ -164,11 +164,14 @@ using the following data fields and functions:
 | Function        | Description                                                                                       |
 |-----------------|---------------------------------------------------------------------------------------------------|
 | `codefile`      | Create a Markdown code block with the content of a file. Path is relative to the repository root. |
+| `lower`         | Equivalent to [`strings.ToLower`](https://pkg.go.dev/strings#ToLower).                            |
 | `plainmarkdown` | Render Markdown content as plaintext.                                                             |
 | `prefixlines`   | Add a prefix to all (newline-separated) lines in a string.                                        |
 | `split`         | Split string into sub-strings, by a given separator (ex. `split .Name "_"`).                      |
+| `title`         | Equivalent to [`strings.ToLower`](https://pkg.go.dev/strings#ToTitle).                            |
 | `tffile`        | A special case of the `codefile` function, designed for Terraform files (i.e. `.tf`).             |
 | `trimspace`     | Equivalent to [`strings.TrimSpace`](https://pkg.go.dev/strings#TrimSpace).                        |
+| `upper`         | Equivalent to [`strings.ToLower`](https://pkg.go.dev/strings#ToUpper).                            |
 
 ## Disclaimer
 

internal/provider/template.go

@@ -32,17 +32,17 @@ type (
 func newTemplate(name, text string) (*template.Template, error) {
 	tmpl := template.New(name)
 
-	tmpl.Funcs(template.FuncMap(map[string]interface{}{
+	tmpl.Funcs(map[string]interface{}{
 		"codefile":      tmplfuncs.CodeFile,
+		"lower":         strings.ToLower,
 		"plainmarkdown": mdplain.PlainMarkdown,
 		"prefixlines":   tmplfuncs.PrefixLines,
-		"tffile": func(file string) (string, error) {
-			// TODO: omit comment handling
-			return tmplfuncs.CodeFile("terraform", file)
-		},
-		"trimspace": strings.TrimSpace,
-		"split":     strings.Split,
-	}))
+		"split":         strings.Split,
+		"tffile":        terraformCodeFile,
+		"title":         strings.ToTitle,
+		"trimspace":     strings.TrimSpace,
+		"upper":         strings.ToUpper,
+	})
 
 	var err error
 	tmpl, err = tmpl.Parse(text)
@@ -53,6 +53,11 @@ func newTemplate(name, text string) (*template.Template, error) {
 	return tmpl, nil
 }
 
+func terraformCodeFile(file string) (string, error) {
+	// TODO: omit comment handling
+	return tmplfuncs.CodeFile("terraform", file)
+}
+
 func renderTemplate(name string, text string, out io.Writer, data interface{}) error {
 	tmpl, err := newTemplate(name, text)
 	if err != nil {