From 98307eefb98e8ec4fa76501aa3bfb877ff59de96 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Bar=C4=87?= <xgqt@gentoo.org>
Date: Tue, 21 Jun 2022 21:35:49 +0200
Subject: [PATCH] app-emacs/compat: check for native JSON parsing support
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Closes: https://bugs.gentoo.org/853322
Signed-off-by: Maciej Barć <xgqt@gentoo.org>
---
 app-emacs/compat/compat-28.1.1.3.ebuild | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/app-emacs/compat/compat-28.1.1.3.ebuild b/app-emacs/compat/compat-28.1.1.3.ebuild
index c220c6ceb7a3d..e373d5d8f5079 100644
--- a/app-emacs/compat/compat-28.1.1.3.ebuild
+++ b/app-emacs/compat/compat-28.1.1.3.ebuild
@@ -29,3 +29,19 @@ ELISP_TEXINFO="${PN}.texi"
 src_compile() {
 	emake compile ${PN}.info
 }
+
+src_test() {
+	local has_json="$("${EMACS}" ${EMACSFLAGS} --eval "(princ (fboundp 'json-parse-string))")"
+	if [[ "${has_json}" != t ]] ; then
+		local line
+		while read line ; do
+			ewarn "${line}"
+		done <<-EOF
+		Your current Emacs version does not support native JSON parsing,
+		which is required for running tests of ${CATEGORY}/${PN}.
+		Use "eselect emacs" to select an Emacs version with such feature.
+		EOF
+	else
+		emake test
+	fi
+}