add (hacky and slow) reverse regex search

1 files changed, 11 insertions, 0 deletions

diff --git a/txt.c b/txt.c
index fd51bc4..a982cd2 100644
--- a/txt.c
+++ b/txt.c
@@ -314,6 +314,17 @@ Str txt_next_chunk(TxtLoc *l) {
 	return s;
 }
 
+Str txt_prev_chunk(TxtLoc *l) {
+	while (!l->i && l->p > 0) {
+		l->p--;
+		l->i = l->t->ptbl.v[l->p].n;
+	}
+	TxtPiece *p = &l->t->ptbl.v[l->p];
+	Str s = { l->t->buf[p->buf].s + p->ofs, l->i };
+	l->i = 0;
+	return s;
+}
+
 int txt_range_equal(TxtLoc lo, TxtLoc hi, Str cmp) {
 	u32 i = 0;
 	while (txt_before(lo, hi)) {