gentmpl

gentmpl

gentmpl is a command line utility that generates a go package that parse and render html or text templates.

Installation

go get -u github.com/mmbros/gentmpl

Usage

Usage: gentmpl [OPTION]...

Options:

  -c string
    	Configuration file used to generate the package. (default "gentmpl.conf")
  -d	Debug mode. Do not cache templates and do not format generated code.
  -g	Generate the configuration file instead of the package.
  -h	Show command usage information.
  -o string
    	Optional output file for package/config file. If empty stdout will be used.

Description

Without the -g option, gentmpl generates a package that automatically handle the creation of the templates, loading and parsing the files specified in the configuration. Moreover for each page of name Name gentmpl defines a constant PageName so that to render the page all you have to do is:

err := PageName.Execute(w, data)

In case the -g option is given, gentmpl generates a demo configuration file, instead of the package.

Examples:

Generate the templates package (using the default configuration file):

genttmpl -o templates.go

Generate the templates package with debug mode using an esplicit configuration file:

genttmpl -d -c tmpl.conf -o tmpl.go

Generate a demo configuration file:

gentmpl -g -o demo.conf

Configuration file

gentmpl reads from a TOML configuration file the parameters used to generate the code.

The mandatory informations of the configuration file are the templates and pages sections.

Templates

The templates section defines the templates used to render the pages. Each template must have a name and a list of string items. Each string item can be a:

• path of a file to load in the template creation.
• name of another template to include in the current template.

Example:

[templates]
flat = ["flat/footer.tmpl", "flat/header.tmpl", "flat/page1.tmpl", "flat/page2and3.tmpl"]
inh1 = ["inhbase", "inheritance/content1.tmpl"]
inh2 = ["inhbase", "inheritance/content2.tmpl"]
inhbase = ["inheritance/base.tmpl"]

Pages

The pages section defines the pages to render. Each page must have a name, a template attribute that refers to the name of a template defined in the templates section, and optionally a base name. If defined, the base name will be used in template.ExecuteTemplate as the name of the template. Otherwise template.Execute will be used.

Example:

[pages]
Inh1 = {template="inh1"}
Inh2 = {template="inh2"}
Pag1 = {template="flat", base="page-1"}
Pag2 = {template="flat", base="page-2"}
Pag3 = {template="flat", base="page-3"}

Optional configuration parameters

• asset_manager: string. Asset manager to use. Possible values: "none" (default) | "go-bindata".

• func_map: string (default ""). Name of the template.FuncMap variable used in template creation. The variable must be defined in another file of the same package (ex: "templates/func-map.go"). If empty, no funcMap will be used.

• no_cache: bool (default false). Do not cache the templates. A new template will be created on every page.Execute.

• no_go_format: bool (dafault false). Do not format the generated code with go/format.

• package_name: string (default "templates"). Package name used in the generated code.

• page_enum_prefix: string (default "Page"). String used as prefix in the PageEnum constants.

• page_enum_suffix: string (default ""). String used as suffix in the PageEnum constants.

• page_enum_type: string (default "PageEnum"). Name of the PageEnum type definition.

• template_base_dir: string (default ""). Base folder of the templates files.

• template_enum_type: string (default "templateEnum"). Name of the TemplateEnum type definition.

• text_remplate: bool (default false). Use text/template instead of html/template.

Generated Package

The generated package exports an enum type PageEnum and a list of constant of the same type for each page to be rendered.

Example:

// PageEnum is the type of the Pages
PageEnum uint8

// PageEnum constants
const (
	PageInh1 PageEnum = iota
	PageInh2
	PagePag1
	PagePag2
	PagePag3
)

The following methods are defined on the PageEnum type:

• Execute(io.Writer, interface{}) error: execute the page's template to the specified data object.
• Base() string: returns the base name used to render the page's template
• Template() template.Template: returns the template
• Files() []string: returns the files used by the page's template

Development notes

The project layout follows Writing Go Applications with Reusable Logic.

See also:

• Gorram