From 766d1849ffdcd2f0ddf50dd879494829ed03734b Mon Sep 17 00:00:00 2001
From: "Dirk-Jan C. Binnema" <djcb@djcbsoftware.nl>
Date: Sat, 29 Jul 2023 16:39:08 +0300
Subject: [PATCH] test-utils: add TempTz, RAII temporary timezone

---
 lib/utils/mu-test-utils.hh | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/lib/utils/mu-test-utils.hh b/lib/utils/mu-test-utils.hh
index b61a4af1..aa3aee0c 100644
--- a/lib/utils/mu-test-utils.hh
+++ b/lib/utils/mu-test-utils.hh
@@ -136,6 +136,28 @@ private:
 	const bool autodelete_;
 };
 
+/**
+ * Temporary (RAII) timezone
+ */
+struct TempTz {
+	TempTz(const char* tz) {
+		if (timezone_available(tz))
+			old_tz_ = set_tz(tz);
+		else
+			old_tz_ = {};
+		mu_debug("timezone '{}' {}available", tz, old_tz_ ? "": "not");
+	}
+	~TempTz() {
+		if (old_tz_) {
+			mu_debug("reset timezone to '{}'", old_tz_);
+			set_tz(old_tz_);
+		}
+	}
+	bool available() const { return !!old_tz_; }
+private:
+	const char *old_tz_{};
+};
+
 } // namepace Mu