From e11b48dc6a27517cca5ccf5b11838b3eefda2335 Mon Sep 17 00:00:00 2001
From: Kirill Chibisov <contact@kchibisov.com>
Date: Tue, 06 Aug 2024 21:02:03 +0300
Subject: [PATCH] Emit \(ti and \(ha instead of ~ and ^

Groff since 1.23 maps '^' and '~' by default to U+02C6 and U+02DC
respectively.

The suggestion in groff_man_style(7) is to use \(ti and \(ha when the
latin variants are desired.

Links: https://lists.gnu.org/archive/html/info-gnu/2023-07/msg00001.html

---
 src/main.c                |  8 ++++++++
 test/character-substitute | 18 ++++++++++++++++++

diff --git a/src/main.c b/src/main.c
index a49cb401769df9e694fb547fa8a7d939b13ed818..45910987e6c0a7eb48e28a2e09c75e729f0954d9 100644
--- a/src/main.c
+++ b/src/main.c
@@ -261,6 +261,14 @@ 			utf8_fputch(p->output, ch);
 			// Suppress sentence spacing
 			fprintf(p->output, "\\&");
 			break;
+		case '~':
+			// Escape ~ to not render it with U+02DC
+			fprintf(p->output, "\\(ti");
+			break;
+		case '^':
+			// Escape ^ to not render it with U+02C6
+			fprintf(p->output, "\\(ha");
+			break;
 		default:
 			last = ch;
 			utf8_fputch(p->output, ch);
diff --git a/test/character-substitute b/test/character-substitute
new file mode 100755
index 0000000000000000000000000000000000000000..6fe5589165620a9bdbbd6fcc9cb1056aed5c0b54
--- /dev/null
+++ b/test/character-substitute
@@ -0,0 +1,18 @@
+#!/bin/sh
+. test/lib.sh
+
+begin "Substitute ~ with \(ti"
+scdoc <<EOF | grep '\\fIhello\\(ti\\fR' >/dev/null
+test(8)
+
+_hello~_
+EOF
+end 0
+
+begin "Substitute ^ with \(ha"
+scdoc <<EOF | grep '\\fIhello\\(ha\\fR' >/dev/null
+test(8)
+
+_hello^_
+EOF
+end 0

-- 
2.48.1