Reverse zones: list other views' addresses, clearer wording

The zone page and jarl zone show list the addresses only other views'
records use (ptr_other_views_list), with the name each would get and the
view it comes from, and say plainly that they aren't missing here. The
page's button reads 'Add PTR records for them in view X'. zone show
lists the missing PTRs too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

cmd/jarl/zones.go

@@ -8,6 +8,7 @@ import (
 	"net/netip"
 	"net/url"
 	"os"
+	"slices"
 	"strconv"
 	"strings"
 	"unicode/utf8"
@@ -100,9 +101,16 @@ func zoneCmd() *cobra.Command {
 					fmt.Fprintf(w, "Network:\t%s\n", z.Prefix)
 					if z.PTRMissing > 0 {
 						fmt.Fprintf(w, "Missing PTRs:\t%d (addresses the view's records use here; add them: jarl zone fill-ptr %s)\n", z.PTRMissing, args[0])
+						printPTRFills(w, z.PTRMissingList, z.PTRMissing)
 					}
 					if z.PTROtherViews > 0 {
-						fmt.Fprintf(w, "Other views:\t%d addresses here only other views' records use, without a PTR record (to name them from there: jarl zone fill-ptr %s --other-views)\n", z.PTROtherViews, args[0])
+						what := "addresses"
+						if z.PTROtherViews == 1 {
+							what = "address"
+						}
+						fmt.Fprintf(w, "Other views:\t%d %s with A or AAAA records only in %s, so not missing here (add PTRs for them in this view too: jarl zone fill-ptr %s --other-views)\n",
+							z.PTROtherViews, what, fromViews(z.PTROtherViewsList), args[0])
+						printPTRFills(w, z.PTROtherViewsList, z.PTROtherViews)
 					}
 				}
 				if len(z.LinkedWith) > 0 {
@@ -1174,6 +1182,39 @@ func terminalWidth() int {
 	return width
 }
 
+// printPTRFills lists PTR records a reverse zone lacks under zone show's
+// line about them: address -> name, and the view the name is from.
+func printPTRFills(w io.Writer, fills []api.PTRFill, total int) {
+	for _, f := range fills {
+		from := ""
+		if f.From != "" {
+			from = " (view " + f.From + ")"
+		}
+		fmt.Fprintf(w, "\t  %s -> %s%s\n", f.Address, dnsname.Display(f.Target), from)
+	}
+	if total > len(fills) {
+		fmt.Fprintf(w, "\t  and %d more\n", total-len(fills))
+	}
+}
+
+// fromViews names the views PTR fills take their names from: "view
+// internal", "views internal and lab".
+func fromViews(fills []api.PTRFill) string {
+	var vs []string
+	for _, f := range fills {
+		if f.From != "" && !slices.Contains(vs, f.From) {
+			vs = append(vs, f.From)
+		}
+	}
+	switch len(vs) {
+	case 0:
+		return "other views"
+	case 1:
+		return "view " + vs[0]
+	}
+	return "views " + strings.Join(vs[:len(vs)-1], ", ") + " and " + vs[len(vs)-1]
+}
+
 func zoneFillPTRCmd() *cobra.Command {
 	var view string
 	var otherViews bool