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package parse
import (
"bufio"
"bytes"
"io"
"net/url"
"regexp"
"strings"
)
var urlRe = regexp.MustCompile(`([\w\d]{2,}:([^\s>\]\)"]|\][^\s>\)"]|\]$){8,})`)
// HttpLinks searches a reader for a http link and returns a copy of the
// reader and a slice with links.
func HttpLinks(r io.Reader) (io.Reader, []string) {
var buf bytes.Buffer
tr := io.TeeReader(r, &buf)
scanner := bufio.NewScanner(tr)
linkMap := make(map[string]struct{})
for scanner.Scan() {
line := scanner.Text()
for _, word := range strings.Fields(line) {
if links := urlRe.FindStringSubmatch(word); len(links) > 0 {
if _, err := url.Parse(links[0]); err != nil {
continue
}
linkMap[strings.TrimSpace(links[0])] = struct{}{}
}
}
}
results := []string{}
for link := range linkMap {
results = append(results, link)
}
return &buf, results
}
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