From 3f35198a6b21c339a397e7e1b0f74c179b51b671 Mon Sep 17 00:00:00 2001
From: Ryan <ryan@carelesslisper.xyz>
Date: Wed, 13 Sep 2023 10:40:03 -0400
Subject: [PATCH] apply external-pipe-eternal patch

Makes it work with scrollback.
---
 st.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/st.c b/st.c
index d14e232..7ac5025 100644
--- a/st.c
+++ b/st.c
@@ -50,6 +50,10 @@
 	               : term.line[(y) - term.scr] \
 )
 
+#define TLINE_HIST(y) ( \
+        (y) <= HISTSIZE-term.row+2 ? term.hist[(y)] : term.line[(y-HISTSIZE+term.row-3)] \
+)
+
 #define TLINEABS(y) ( \
 	(y) < 0 ? term.hist[(term.histi + (y) + 1 + HISTSIZE) % HISTSIZE] : term.line[(y)] \
 )
@@ -489,6 +493,20 @@ tgetline(char *buf, const Glyph *fgp)
 	return ptr - buf;
 }
 
+int
+tlinehistlen(int y)
+{
+	int i = term.col;
+
+	if (TLINE_HIST(y)[i - 1].mode & ATTR_WRAP)
+		return i;
+
+	while (i > 0 && TLINE_HIST(y)[i - 1].u == ' ')
+		--i;
+
+	return i;
+}
+
 void
 selstart(int col, int row, int snap)
 {
@@ -2264,16 +2282,18 @@ externalpipe(const Arg *arg)
 	/* ignore sigpipe for now, in case child exists early */
 	oldsigpipe = signal(SIGPIPE, SIG_IGN);
 	newline = 0;
-	for (n = 0; n < term.row; n++) {
-		bp = term.line[n];
-		lastpos = MIN(tlinelen(n) + 1, term.col) - 1;
+	for (n = 0; n <= HISTSIZE + 2; n++) {
+		bp = TLINE_HIST(n);
+		lastpos = MIN(tlinehistlen(n) + 1, term.col) - 1;
 		if (lastpos < 0)
 			break;
+        if (lastpos == 0)
+            continue;
 		end = &bp[lastpos + 1];
 		for (; bp < end; ++bp)
 			if (xwrite(to[1], buf, utf8encode(bp->u, buf)) < 0)
 				break;
-		if ((newline = term.line[n][lastpos].mode & ATTR_WRAP))
+		if ((newline = TLINE_HIST(n)[lastpos].mode & ATTR_WRAP))
 			continue;
 		if (xwrite(to[1], "\n", 1) < 0)
 			break;