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renderer.go
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renderer.go
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package bananas
import (
"bufio"
"bytes"
"embed"
"log"
"os"
"path/filepath"
"strings"
"text/template"
)
type TemplData map[string]any
func MustRenderTmpl(
templateFs embed.FS, templateFile string, data TemplData,
) (outPath string, content *bytes.Buffer, ok bool) {
ok = strings.HasSuffix(templateFile, ".tmpl")
if !ok {
log.Println("skipping file", templateFile, ". file name should end with .tmpl")
return
}
tmplFile, err := templateFs.Open(templateFile)
if err != nil {
log.Println("failed to open file", templateFile, "reason:", err)
return "", nil, false
}
defer tmplFile.Close()
scanner := bufio.NewScanner(tmplFile)
// Read the first line
if scanner.Scan() {
firstLine := scanner.Text()
if strings.HasPrefix(firstLine, "// out_path:") {
outPath = strings.TrimSpace(strings.TrimPrefix(firstLine, "// out_path:"))
}
}
if err := scanner.Err(); err != nil {
log.Println("failed to scan file", templateFile, "reason:", err)
return "", nil, false
}
// Read the rest of the template
var tmplContent bytes.Buffer
for scanner.Scan() {
tmplContent.WriteString(scanner.Text() + "\n")
}
if err := scanner.Err(); err != nil {
log.Println("failed to read template", templateFile, "reason:", err)
return "", nil, false
}
// Parse and execute the template
t, err := template.New(filepath.Base(templateFile)).Parse(tmplContent.String())
if err != nil {
log.Println("failed to create template for", templateFile, "reason:", err)
return "", nil, false
}
content = &bytes.Buffer{}
if err := t.Execute(content, data); err != nil {
log.Println("failed to render template for", templateFile, "reason:", err)
return "", nil, false
}
return outPath, content, true
}
func WriteFile(filePath string, content *bytes.Buffer) error {
// Ensure the target directory exists
// log.Println("fpath", filePath, content.String())
dir := filepath.Dir(filePath)
if _, err := os.Stat(dir); err != nil {
log.Fatalf("error in setup, %s dir not created. reason: %v\n", dir, err)
}
// Write the file
err := os.WriteFile(filePath, content.Bytes(), 0644)
if err != nil {
log.Fatalf("Eeror writing file %s. reason: %v\n", filePath, err)
}
return err
}