p1: /v2/scrape, /v1/fetch, auth, CLI, contract tests

Single Fetcher.Fetch on the Guard that holds DenyPrefixes. skipTlsVerification
is ignored. No 502. keys add writes the secret only to --out. Release binary
has no -test-allow-prefix.

vendor/github.com/JohannesKaufmann/html-to-markdown/v2/internal/domutils/adjacent.go

@@ -0,0 +1,75 @@
+package domutils
+
+import (
+	"github.com/JohannesKaufmann/dom"
+	"golang.org/x/net/html"
+)
+
+func collectAdjacentNodes(node *html.Node, matchFn func(n *html.Node) bool) []*html.Node {
+	var collectedNodes []*html.Node
+
+	node = node.NextSibling
+	for node != nil {
+		name := dom.NodeName(node)
+		if name == "span" {
+			// A span has no special meaning. So we just skip it...
+			node = dom.GetNextNeighborNode(node)
+		} else if matchFn(node) {
+			collectedNodes = append(collectedNodes, node)
+			node = dom.GetNextNeighborNodeExcludingOwnChild(node)
+		} else {
+			// Return the collected nodes
+			return collectedNodes
+		}
+	}
+
+	return collectedNodes
+}
+
+func mergeChildren(destinationNode *html.Node, nodes ...*html.Node) {
+	for _, node := range nodes {
+		// We move all the children to the `destinationNode`.
+		children := dom.AllChildNodes(node)
+		for _, child := range children {
+			dom.RemoveNode(child)
+			destinationNode.AppendChild(child)
+		}
+		dom.RemoveNode(node)
+	}
+}
+
+func MergeAdjacent(doc *html.Node, matchFn func(*html.Node) bool) {
+	node := doc
+
+	for node != nil {
+		if matchFn(node) {
+			nextNodes := collectAdjacentNodes(node, matchFn)
+
+			mergeChildren(node, nextNodes...)
+		}
+
+		node = dom.GetNextNeighborElement(node)
+	}
+}
+
+// - - - - - - - - //
+
+func MergeAdjacentTextNodes(n *html.Node) {
+	if n == nil {
+		return
+	}
+
+	var prev *html.Node
+	for c := n.FirstChild; c != nil; {
+		next := c.NextSibling
+		if c.Type == html.TextNode && prev != nil && prev.Type == html.TextNode {
+			// Combine adjacent text nodes
+			prev.Data += c.Data
+			n.RemoveChild(c)
+		} else {
+			MergeAdjacentTextNodes(c)
+			prev = c
+		}
+		c = next
+	}
+}