fix: lazysecrets list keeps each entry on one line, errors to their first

internal/listing/listing.go

@@ -312,10 +312,22 @@ func (r result) failed() Entry {
 	default:
 		e = Entry{Kind: "source", Provider: kindOf(r.p.Kind()), Path: []string{r.p.Label()}}
 	}
-	e.Error = r.err.Error()
+	e.Error = firstLine(r.err.Error())
 	return e
 }
 
+// firstLine is an error's first line, the summary (Azure's go on with
+// the caller's IDs and more): an entry is one line. Tabs, which would
+// split it into columns, are spaces.
+func firstLine(s string) string {
+	for line := range strings.Lines(s) {
+		if line = strings.TrimSpace(line); line != "" {
+			return strings.ReplaceAll(line, "\t", " ")
+		}
+	}
+	return "unreadable"
+}
+
 func kindOf(k provider.Kind) string { return strings.ToLower(string(k)) }
 
 // accountOf is the account part of a source's provider label ("alice" in

internal/listing/listing_test.go

@@ -211,3 +211,15 @@ func TestListKinds(t *testing.T) {
 		t.Error("a list that failed wasn't listed")
 	}
 }
+
+func TestErrorsAreOneLine(t *testing.T) {
+	for in, want := range map[string]string{
+		"403 Forbidden: Caller is not authorized\nCaller: appid=x;oid=y\nVault: kv;location=z": "403 Forbidden: Caller is not authorized",
+		"\n  timeout\tafter 30s\n": "timeout after 30s",
+		"":                         "unreadable",
+	} {
+		if got := firstLine(in); got != want {
+			t.Errorf("firstLine(%q) = %q, want %q", in, got, want)
+		}
+	}
+}