From b36327c3e3d340c7f9fa0060bb4c57255518d28c Mon Sep 17 00:00:00 2001
From: WormHeamer
Date: Mon, 29 Dec 2025 15:54:17 -0500
Subject: dramatically speed up shell_replace() with two more close() calls

---
 main.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/main.c b/main.c
index 0923324..a7f63e3 100644
--- a/main.c
+++ b/main.c
@@ -120,6 +120,8 @@ int popen2(const char *cmd, int *in, int *out) {
 		close(wr[0]);
 		dup2(rd[0], STDIN_FILENO);
 		dup2(wr[1], STDOUT_FILENO);
+		close(rd[0]);
+		close(wr[1]);
 		if (execl("/bin/sh", "sh", "-c", cmd, 0)) {
 			err(1, "execl");
 		}
@@ -138,9 +140,6 @@ int shell_replace(TxtLoc start, TxtLoc end, const char *cmd) {
 		end = t;
 	}
 
-	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);
 	if (p < 0) return -1;
@@ -183,13 +182,18 @@ int shell_replace(TxtLoc start, TxtLoc end, const char *cmd) {
 		}
 	}
 
+	/* TODO: wrap this logic in a general txt_replace() function,
+	 * and make it so it will avoid deleting as much as possible;
+	 * reflowing text often only changes lines towards the end,
+	 * for example.  maybe do something like skip as many pieces
+	 * as match 100%, then iteratively halve the length of the
+	 * final one until it matches or gets too small.
+	 */
 	if (!txt_range_equal(start, end, (Str){rds.v,rds.n})) {
+		u32 b = txt_ofs(cur);
 		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);
-		}
+		end = txt_insert(start, rds.v, rds.n);
+		cur = txt_at(start.t, b);
 	}
 	return 0;
 }
@@ -386,8 +390,8 @@ int main(int argc, const char **argv) {
 	vui_init();
 	vui_curs_vis(1);
 	vui_redraw_fn(draw);
-	const char *path = "test.txt";
-	//const char *path = "/usr/share/dict/words";
+	//const char *path = "test.txt";
+	const char *path = "/usr/share/dict/words";
 	if (argc > 1) path = argv[1];
 	if (txt_load(&txt, path)) err(1, "couldn't open file");
 	cur = txt_end(&txt);
-- 
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