1 files changed, 11 insertions, 4 deletions

diff --git a/main.c b/main.c
index 15188f4..0923324 100644
--- a/main.c
+++ b/main.c
@@ -138,7 +138,8 @@ int shell_replace(TxtLoc start, TxtLoc end, const char *cmd) {
 		end = t;
 	}
 
-	u32 cur_ofs = txt_range_len(cur, end);
+	int cur_ofs = txt_before(cur, start) || txt_after(cur, end)
+	    ? -1 : txt_range_len(cur, end);
 
 	int in, out;
 	int p = popen2(cmd, &in, &out);
@@ -151,7 +152,6 @@ int shell_replace(TxtLoc start, TxtLoc end, const char *cmd) {
 	Str wrs = txt_collect_range(start, end, &scratch);
 	DYNARR(char) rds = { 0 };
 	u32 wr_i = 0;
-	cur = txt_delete_range(start, end);
 	while ((pfds[0].fd >= 0 || pfds[1].fd >= 0) && poll(pfds, 2, 200) >= 0) {
 		const u32 chunksz = 8L << 10;
 		if (pfds[0].revents & POLLOUT) {
@@ -182,8 +182,15 @@ int shell_replace(TxtLoc start, TxtLoc end, const char *cmd) {
 			pfds[1].fd = -1;
 		}
 	}
-	cur = txt_insert(cur, rds.v, rds.n);
-	while (cur_ofs--) cur = cprev(cur);
+
+	if (!txt_range_equal(start, end, (Str){rds.v,rds.n})) {
+		start = txt_delete_range(start, end);
+		start = txt_insert(start, rds.v, rds.n);
+		if (cur_ofs != -1) {
+			cur = start;
+			while (cur_ofs--) cur = cprev(cur);
+		}
+	}
 	return 0;
 }