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package main
import (
"flag"
"fmt"
"os"
"strings"
"github.com/PuerkitoBio/goquery"
"golang.org/x/net/html"
)
type Mode string
const (
ModeQuery Mode = "query"
ModeReplace Mode = "replace"
ModeAppend Mode = "append"
ModePrepend Mode = "prepend"
ModeInvalid Mode = "invalid"
FilenameStdin string = "-"
)
func main() {
selector := flag.String("selector", "", "DOM query")
mode := flag.String("mode", "query", "Operation mode: query, replace, append, prepend")
filename := flag.String("filename", "", "Path to HTML file")
writeData := flag.String("wdata", "", "Data to write when in non-query mode")
flag.Parse()
//args := flag.Args()
parsedMode, err := parseMode(*mode)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to parse -mode: %s", err.Error())
os.Exit(1)
}
doc, err := parseFilename(*filename)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to parse -filename: %s", err.Error())
os.Exit(1)
}
switch parsedMode {
case ModeQuery:
if *selector == "" {
// if selector is not specified return whole doc by default
htmlStr, err := doc.Html()
if err != nil {
fmt.Fprintf(os.Stderr, "failed to construct HTML string: %s", err.Error())
os.Exit(1)
}
fmt.Println(htmlStr)
} else {
doc.Find(*selector).Each(func(i int, s *goquery.Selection) {
var buf strings.Builder
err := html.Render(&buf, s.Get(0))
if err != nil {
fmt.Fprintf(os.Stderr, "failed to render node: %s", err.Error())
os.Exit(1)
}
output := buf.String()
fmt.Println(output)
})
}
case ModeReplace:
doc.Find(*selector).Each(func(i int, s *goquery.Selection) {
s.ReplaceWithHtml(*writeData)
})
case ModeAppend:
doc.Find(*selector).Each(func(i int, s *goquery.Selection) {
s.AppendHtml(*writeData)
})
case ModePrepend:
doc.Find(*selector).Each(func(i int, s *goquery.Selection) {
s.PrependHtml(*writeData)
})
}
if parsedMode != ModeQuery {
// in non-query mode, print entire document back with modifications
htmlStr, err := doc.Html()
if err != nil {
fmt.Fprintf(os.Stderr, "failed to render node: %s", err.Error())
os.Exit(1)
}
fmt.Println(htmlStr)
}
}
func parseMode(mode string) (Mode, error) {
validModes := map[string]any{
string(ModeQuery): nil,
string(ModeReplace): nil,
string(ModeAppend): nil,
string(ModePrepend): nil,
}
if _, ok := validModes[mode]; !ok {
return ModeInvalid, fmt.Errorf("invalid mode: %s", mode)
}
return Mode(mode), nil
}
func parseFilename(fileName string) (*goquery.Document, error) {
var fd *os.File
var err error
if fileName == FilenameStdin {
fd = os.Stdin
} else {
fd, err = os.Open(fileName)
if err != nil {
return nil, fmt.Errorf("error opening file: %s", err.Error())
}
defer fd.Close()
}
doc, err := goquery.NewDocumentFromReader(fd)
if err != nil {
return nil, fmt.Errorf("error parsing HTML: %s", err.Error())
}
return doc, nil
}
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