gf_templates.go

/*
GloFlow application and media management/publishing platform
Copyright (C) 2019 Ivan Trajkovic

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/

package gf_core

import (
	"fmt"
	"os"
	"strings"
	"path/filepath"
	"io/ioutil"
	"text/template"
)

//-------------------------------------------------

func TemplatesLoad(pMainTemplateFilepathStr string,
	pRuntimeSys *RuntimeSys) (*template.Template, []string, *GFerror) {

	templateFilenameStr := filepath.Base(pMainTemplateFilepathStr)
	templateDirPathStr := filepath.Dir(pMainTemplateFilepathStr)

	//---------------------
	// SUB_TEMPLATES - templates that are imported into the main template
	subtemplates_dir_path_str   := fmt.Sprintf("%s/subtemplates", templateDirPathStr)
	subtemplatesNamesLst        := []string{}
	subtemplates_file_paths_lst := []string{}

	// load subtemplates if the subtemplates/ dir exists
	if _, err := os.Stat(subtemplates_dir_path_str); !os.IsNotExist(err) {

		files_lst, err := ioutil.ReadDir(subtemplates_dir_path_str)
		if err != nil {
			gfErr := ErrorCreate("failed to parse a template",
				"dir_list_error",
				map[string]interface{}{"subtemplates_dir_path_str": subtemplates_dir_path_str,},
				err, "gf_core", pRuntimeSys)
			return nil, nil, gfErr
		}

		for _, f := range files_lst {
			filename_str := f.Name()
			if strings.HasSuffix(filename_str, ".html") {
				subtemplatesNamesLst        = append(subtemplatesNamesLst, strings.Split(filename_str, ".")[0])
				subtemplates_file_paths_lst = append(subtemplates_file_paths_lst, fmt.Sprintf("%s/%s", subtemplates_dir_path_str, filename_str))
			}
		}
	}

	//---------------------
	// TEMPLATES
	templatesPathsLst := append([]string{pMainTemplateFilepathStr,}, subtemplates_file_paths_lst...)

	// IMPORTANT!! - load several template files into a single template name
	mainTmpl, err := template.New(templateFilenameStr).ParseFiles(templatesPathsLst...)
	if err != nil {
		gfErr := ErrorCreate("failed to parse a template",
			"template_create_error",
			map[string]interface{}{"main_template_filepath_str": pMainTemplateFilepathStr,},
			err, "gf_core", pRuntimeSys)
		return nil, nil, gfErr
	}
	
	//---------------------

	return mainTmpl, subtemplatesNamesLst, nil
}