feat: separate into remote and local commands

I'd like to be able to read HTML locally as well.

1 files changed, 47 insertions, 0 deletions

diff --git a/internal/findlinks/doc.go b/internal/findlinks/doc.go
new file mode 100644
index 0000000..28573f8
--- /dev/null
+++ b/internal/findlinks/doc.go
@@ -0,0 +1,47 @@
+// Package findlinks iterates over an HTML tree and extracts relevant
+// data from it.
+package findlinks
+
+import (
+	"fmt"
+	"io"
+
+	"golang.org/x/net/html"
+	"golang.org/x/net/html/atom"
+)
+
+// A Link encapsulates the data harvested from a link.
+type Link struct {
+	Href string
+	Text string
+}
+
+// findLinks consumes the given [io.Reader], scraping it of anchor
+// tags. Each anchor tag is "unmarshalled" into a [Link]. The
+// resulting slice of Links is returned, along with an error.
+func FindLinks(r io.Reader) ([]Link, error) {
+	doc, err := html.Parse(r)
+	if err != nil {
+		return nil, fmt.Errorf("can't parse html reader: %w", err)
+	}
+
+	var links []Link
+
+	for n := range doc.Descendants() {
+		if n.Type == html.ElementNode && n.DataAtom == atom.A {
+			var link Link
+
+			// Scan the href.
+			for _, a := range n.Attr {
+				if a.Key == "href" {
+					link.Href = a.Val
+				}
+			}
+
+			// FIXME: for now, only scan for hrefs.
+			links = append(links, link)
+		}
+	}
+
+	return links, nil
+}