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tmpl.go
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tmpl.go
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package main
import (
"bufio"
"fmt"
htmltemplate "html/template"
"log"
"os"
"path/filepath"
"strings"
texttemplate "text/template"
"github.com/Masterminds/sprig/v3"
)
/*
determineTemplateFiles determines template files for parsing.
*/
func determineTemplateFiles() ([]string, error) {
globs := strings.Split(*templates, ",")
var templateFiles []string
for _, glob := range globs {
tmpfiles, err := filepath.Glob(glob)
if err != nil {
return nil, fmt.Errorf("error [%v] at filepath.Glob()", err)
}
// ignore directories
for _, tmpfile := range tmpfiles {
info, err := os.Stat(tmpfile)
if err != nil {
return nil, fmt.Errorf("error [%v] at os.Stat()", err)
}
if info.IsDir() {
continue
}
templateFiles = append(templateFiles, tmpfile)
}
}
if len(templateFiles) == 0 {
return nil, fmt.Errorf("no template file found for parsing")
}
fmt.Printf("Files for template parsing:\n")
for i := range templateFiles {
fmt.Printf("- %s\n", templateFiles[i])
}
return templateFiles, nil
}
/*
processTemplates processes (parse, execute) template file set.
*/
func processTemplates(templateFiles []string, dotdata any) error {
var err error
*format = strings.ToLower(*format)
switch *format {
case "text":
// create text template with functions
templ := texttemplate.New(templateFiles[0]).Funcs(sprig.FuncMap()).Funcs(
texttemplate.FuncMap{
"readJSON": readJSON,
"readYAML": readYAML,
"readCSV": readCSV,
"readCSVMap": readCSVMap,
"readText": readText,
"readLines": readLines,
"readXML": readXML,
"readTOML": readTOML,
"fileExists": fileExists,
"fileStat": fileStat,
"fileRead": fileRead,
"toTypeHTML": toTypeHTML,
"toTypeCSS": toTypeCSS,
"toTypeJS": toTypeJS,
"toTypeURL": toTypeURL,
})
// parse template
fmt.Printf("\nParsing text template(s) ...\n")
templ, err = templ.ParseFiles(templateFiles...)
if err != nil {
return fmt.Errorf("unable to parse text template(s), error=[%v]", err)
}
startTemplate := templ.Name()
fmt.Printf("\nTemplates defined after parsing:\n")
for _, template := range templ.Templates() {
fmt.Printf("- %s\n", template.Name())
}
// execute template
fmt.Printf("\nExecuting text template [%s] -> [%s] ...\n", startTemplate, *outputFile)
file, err := os.OpenFile(*outputFile, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
if err != nil {
return fmt.Errorf("unable to open output file, file=[%v], error=[%v]", *outputFile, err)
}
writer := bufio.NewWriter(file)
err = templ.Execute(writer, dotdata)
if err != nil {
return fmt.Errorf("unable to execute text template, name=[%v], error=[%v]", startTemplate, err)
}
err = writer.Flush()
if err != nil {
log.Fatalf("unable to flush output file, file=[%v], error=[%v]", *outputFile, err)
}
err = file.Close()
if err != nil {
return fmt.Errorf("unable to close output file, file=[%v], error=[%v]", *outputFile, err)
}
fmt.Printf("Done.\n")
case "html":
// create html template with functions
templ := htmltemplate.New(templateFiles[0]).Funcs(sprig.FuncMap()).Funcs(
htmltemplate.FuncMap{
"readJSON": readJSON,
"readYAML": readYAML,
"readCSV": readCSV,
"readCSVMap": readCSVMap,
"readText": readText,
"readLines": readLines,
"readXML": readXML,
"readTOML": readTOML,
"fileExists": fileExists,
"fileStat": fileStat,
"fileRead": fileRead,
"toTypeHTML": toTypeHTML,
"toTypeCSS": toTypeCSS,
"toTypeJS": toTypeJS,
"toTypeURL": toTypeURL,
})
// parse template
fmt.Printf("\nParsing html template(s) ...\n")
templ, err = templ.ParseFiles(templateFiles...)
if err != nil {
return fmt.Errorf("unable to parse html template(s), error=[%v]", err)
}
startTemplate := templ.Name()
fmt.Printf("\nTemplates defined after parsing:\n")
for _, template := range templ.Templates() {
fmt.Printf("- %s\n", template.Name())
}
// execute template
fmt.Printf("\nExecuting html template [%s] -> [%s] ...\n", startTemplate, *outputFile)
file, err := os.OpenFile(*outputFile, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0666)
if err != nil {
return fmt.Errorf("unable to open output file, file=[%v], error=[%v]", *outputFile, err)
}
writer := bufio.NewWriter(file)
err = templ.Execute(writer, dotdata)
if err != nil {
return fmt.Errorf("unable to execute html template, name=[%v], error=[%v]", startTemplate, err)
}
err = writer.Flush()
if err != nil {
return fmt.Errorf("unable to flush output file, file=[%v], error=[%v]", *outputFile, err)
}
err = file.Close()
if err != nil {
return fmt.Errorf("unable to close output file, file=[%v], error=[%v]", *outputFile, err)
}
fmt.Printf("Done.\n")
default:
return fmt.Errorf("option '-format=%s' not supported", *format)
}
return nil
}