commit c1a72389c0083bb0722cec6ca5f1589d3f6b7c0b
from: Omar Polo <op@omarpolo.com>
date: Thu Jul 15 12:56:45 2021 UTC

don't enter_minibuffer if there are no links/headings

commit - a992513489c1f8812a7e540a3dd4325c52a7a73e
commit + c1a72389c0083bb0722cec6ca5f1589d3f6b7c0b
blob - 209b95c1b288910e1e6244606db8d5e74b13e60d
blob + 20f703053c426d868e4fe21f1a84088c1292e982
--- cmd.c
+++ cmd.c
@@ -559,10 +559,21 @@ cmd_toggle_help(struct buffer *buffer)
 void
 cmd_link_select(struct buffer *buffer)
 {
+	struct line *l;
+
 	GUARD_RECURSIVE_MINIBUFFER();
 
+	l = TAILQ_FIRST(&buffer->page.head);
+	while (l != NULL && l->type != LINE_LINK)
+		l = TAILQ_NEXT(l, lines);
+
+	if (l == NULL) {
+		message("No links found");
+		return;
+	}
+
 	enter_minibuffer(sensible_self_insert, ls_select, exit_minibuffer,
-	    NULL, compl_ls, TAILQ_FIRST(&buffer->page.head));
+	    NULL, compl_ls, l);
 	strlcpy(ministate.prompt, "Select link: ", sizeof(ministate.prompt));
 }
 
@@ -579,10 +590,24 @@ cmd_swiper(struct buffer *buffer)
 void
 cmd_toc(struct buffer *buffer)
 {
+	struct line *l;
+
 	GUARD_RECURSIVE_MINIBUFFER();
 
+	l = TAILQ_FIRST(&buffer->page.head);
+	while (l != NULL &&
+	    l->type != LINE_TITLE_1 &&
+	    l->type != LINE_TITLE_2 &&
+	    l->type != LINE_TITLE_3)
+		l = TAILQ_NEXT(l, lines);
+
+	if (l == NULL) {
+		message("No headings found");
+		return;
+	}
+
 	enter_minibuffer(sensible_self_insert, toc_select, exit_minibuffer,
-	    NULL, compl_toc, TAILQ_FIRST(&buffer->page.head));
+	    NULL, compl_toc, l);
 	strlcpy(ministate.prompt, "Select heading: ",
 	    sizeof(ministate.prompt));
 }