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render.go
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render.go
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package files
import (
"fmt"
"os"
"path/filepath"
"strings"
"text/template"
"github.com/Masterminds/sprig/v3"
"github.com/mittwald/mittnite/internal/config"
log "github.com/sirupsen/logrus"
)
type templateData struct {
Env map[string]string
Params map[string]interface{}
}
func newTemplateData(params map[string]interface{}) *templateData {
pairs := os.Environ()
env := make(map[string]string, len(pairs))
for _, e := range pairs {
e := strings.SplitN(e, "=", 2)
if len(e) > 1 {
env[e[0]] = e[1]
}
}
return &templateData{
Params: params,
Env: env,
}
}
func RenderFiles(configs []config.File) error {
log.Info("generating configuration files")
for i := range configs {
err := renderFile(&configs[i])
if err != nil {
return err
}
}
return nil
}
func renderFile(cfg *config.File) error {
if cfg.Template == "" {
return fmt.Errorf("configuration file %s has no specified source", cfg.Target)
}
if cfg.Overwrite != nil && !*cfg.Overwrite {
if _, err := os.Stat(cfg.Target); err == nil {
log.Infof("skipping already existing configuration file %s", cfg.Target)
return nil
}
}
log.Infof("creating configuration file %s from template %s", cfg.Target, cfg.Template)
tplContents, err := os.ReadFile(cfg.Template)
if err != nil {
return err
}
tpl, err := template.New(cfg.Target).Parse(string(tplContents))
if err != nil {
return err
}
folderPath, err := filepath.Abs(filepath.Dir(cfg.Target))
if err != nil {
return err
}
err = os.MkdirAll(folderPath, os.ModePerm)
if err != nil {
return err
}
out, err := os.Create(cfg.Target)
if err != nil {
return err
}
defer func() { _ = out.Close() }()
data := newTemplateData(cfg.Parameters)
err = tpl.Execute(out, data)
if err != nil {
return err
}
return nil
}
// newTemplateFuncs create a map of template
// functions for use with data rendering
func newTemplateFuncs() template.FuncMap {
funcs := sprig.TxtFuncMap()
// env is not needed as environment
// varibles are already accessible
// from the template parameters via Env
delete(funcs, "env")
return funcs
}
// newTemplate creates a template instance with
// custom functions loaded
func newTemplate(name string) *template.Template {
return template.New(name).Funcs(newTemplateFuncs())
}