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|
package templ
import (
"errors"
"fmt"
"io"
"os"
"runtime"
"strconv"
"strings"
"sync"
"time"
)
// WriteWatchModeString is used when rendering templates in development mode.
// the generator would have written non-go code to the _templ.txt file, which
// is then read by this function and written to the output.
//
// Deprecated: since templ v0.3.x generated code uses WriteString.
func WriteWatchModeString(w io.Writer, lineNum int) error {
_, path, _, _ := runtime.Caller(1)
if !strings.HasSuffix(path, "_templ.go") {
return errors.New("templ: WriteWatchModeString can only be called from _templ.go")
}
txtFilePath := strings.Replace(path, "_templ.go", "_templ.txt", 1)
literals, err := getWatchedStrings(txtFilePath)
if err != nil {
return fmt.Errorf("templ: failed to cache strings: %w", err)
}
if lineNum > len(literals) {
return fmt.Errorf("templ: failed to find line %d in %s", lineNum, txtFilePath)
}
s, err := strconv.Unquote(`"` + literals[lineNum-1] + `"`)
if err != nil {
return err
}
_, err = io.WriteString(w, s)
return err
}
var (
watchModeCache = map[string]watchState{}
watchStateMutex sync.Mutex
)
type watchState struct {
modTime time.Time
strings []string
}
func getWatchedStrings(txtFilePath string) ([]string, error) {
watchStateMutex.Lock()
defer watchStateMutex.Unlock()
state, cached := watchModeCache[txtFilePath]
if !cached {
return cacheStrings(txtFilePath)
}
if time.Since(state.modTime) < time.Millisecond*100 {
return state.strings, nil
}
info, err := os.Stat(txtFilePath)
if err != nil {
return nil, fmt.Errorf("templ: failed to stat %s: %w", txtFilePath, err)
}
if !info.ModTime().After(state.modTime) {
return state.strings, nil
}
return cacheStrings(txtFilePath)
}
func cacheStrings(txtFilePath string) ([]string, error) {
txtFile, err := os.Open(txtFilePath)
if err != nil {
return nil, fmt.Errorf("templ: failed to open %s: %w", txtFilePath, err)
}
defer func() {
_ = txtFile.Close()
}()
info, err := txtFile.Stat()
if err != nil {
return nil, fmt.Errorf("templ: failed to stat %s: %w", txtFilePath, err)
}
all, err := io.ReadAll(txtFile)
if err != nil {
return nil, fmt.Errorf("templ: failed to read %s: %w", txtFilePath, err)
}
literals := strings.Split(string(all), "\n")
watchModeCache[txtFilePath] = watchState{
modTime: info.ModTime(),
strings: literals,
}
return literals, nil
}
|
