From 6bd40e339c592bc85e805b752cb38b6d403ce6d0 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicm@cvs.openbsd.org>
Date: Wed, 6 Jul 2022 07:36:37 +0000
Subject: Support hyperlinks with capture-pane -e and add a mouse_hyperlink
 format, GitHub issue 3247 from Jeff Chiang.

---
 usr.bin/tmux/grid.c | 74 +++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 64 insertions(+), 10 deletions(-)

(limited to 'usr.bin/tmux/grid.c')

diff --git a/usr.bin/tmux/grid.c b/usr.bin/tmux/grid.c
index 3658fcc62cc..a9f276bfd1d 100644
--- a/usr.bin/tmux/grid.c
+++ b/usr.bin/tmux/grid.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: grid.c,v 1.125 2022/06/30 09:55:53 nicm Exp $ */
+/* $OpenBSD: grid.c,v 1.126 2022/07/06 07:36:36 nicm Exp $ */
 
 /*
  * Copyright (c) 2008 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -885,18 +885,47 @@ grid_string_cells_add_code(char *buf, size_t len, u_int n, int *s, int *newc,
 	}
 }
 
+static int
+grid_string_cells_add_hyperlink(char *buf, size_t len, const char *id,
+    const char *uri, int escape_c0)
+{
+	char	*tmp;
+
+	if (strlen(uri) + strlen(id) + 17 >= len)
+		return (0);
+
+	if (escape_c0)
+		strlcat(buf, "\\033]8;", len);
+	else
+		strlcat(buf, "\033]8;", len);
+	if (*id != '\0') {
+		xasprintf(&tmp, "id=%s;", id);
+		strlcat(buf, tmp, len);
+		free(tmp);
+	} else
+		strlcat(buf, ";", len);
+	strlcat(buf, uri, len);
+	if (escape_c0)
+		strlcat(buf, "\\033\\\\", len);
+	else
+		strlcat(buf, "\033\\", len);
+	return (1);
+}
+
 /*
  * Returns ANSI code to set particular attributes (colour, bold and so on)
  * given a current state.
  */
 static void
 grid_string_cells_code(const struct grid_cell *lastgc,
-    const struct grid_cell *gc, char *buf, size_t len, int escape_c0)
+    const struct grid_cell *gc, char *buf, size_t len, int escape_c0,
+    struct screen *sc, int *has_link)
 {
-	int	oldc[64], newc[64], s[128];
-	size_t	noldc, nnewc, n, i;
-	u_int	attr = gc->attr, lastattr = lastgc->attr;
-	char	tmp[64];
+	int			 oldc[64], newc[64], s[128];
+	size_t			 noldc, nnewc, n, i;
+	u_int			 attr = gc->attr, lastattr = lastgc->attr;
+	char			 tmp[64];
+	const char		*uri, *id;
 
 	struct {
 		u_int	mask;
@@ -986,19 +1015,32 @@ grid_string_cells_code(const struct grid_cell *lastgc,
 		else
 			strlcat(buf, "\017", len);  /* SI */
 	}
+
+	/* Add hyperlink if changed. */
+	if (sc != NULL && sc->hyperlinks != NULL && lastgc->link != gc->link) {
+		if (hyperlinks_get(sc->hyperlinks, gc->link, &uri, &id, NULL)) {
+			*has_link = grid_string_cells_add_hyperlink(buf, len,
+			    id, uri, escape_c0);
+		} else if (*has_link) {
+			grid_string_cells_add_hyperlink(buf, len, "", "",
+			    escape_c0);
+			*has_link = 0;
+		}
+	}
 }
 
 /* Convert cells into a string. */
 char *
 grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
-    struct grid_cell **lastgc, int with_codes, int escape_c0, int trim)
+    struct grid_cell **lastgc, int with_codes, int escape_c0, int trim,
+    struct screen *s)
 {
 	struct grid_cell	 gc;
 	static struct grid_cell	 lastgc1;
 	const char		*data;
-	char			*buf, code[128];
+	char			*buf, code[8192];
 	size_t			 len, off, size, codelen;
-	u_int			 xx;
+	u_int			 xx, has_link = 0;
 	const struct grid_line	*gl;
 
 	if (lastgc != NULL && *lastgc == NULL) {
@@ -1020,7 +1062,7 @@ grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
 
 		if (with_codes) {
 			grid_string_cells_code(*lastgc, &gc, code, sizeof code,
-			    escape_c0);
+			    escape_c0, s, &has_link);
 			codelen = strlen(code);
 			memcpy(*lastgc, &gc, sizeof **lastgc);
 		} else
@@ -1046,6 +1088,18 @@ grid_string_cells(struct grid *gd, u_int px, u_int py, u_int nx,
 		off += size;
 	}
 
+	if (has_link) {
+		grid_string_cells_add_hyperlink(code, sizeof code, "", "",
+		    escape_c0);
+		codelen = strlen(code);
+		while (len < off + size + codelen + 1) {
+			buf = xreallocarray(buf, 2, len);
+			len *= 2;
+		}
+		memcpy(buf + off, code, codelen);
+		off += codelen;
+	}
+
 	if (trim) {
 		while (off > 0 && buf[off - 1] == ' ')
 			off--;
-- 
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