From 3efd7d9cfbd330ebb45f39648ee96a3e429a06f9 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Mon, 7 Apr 2025 18:14:20 -0400
Subject: Move core libraries into their own folder

---
 lib/time/time_defs.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 lib/time/time_defs.h

(limited to 'lib/time/time_defs.h')

diff --git a/lib/time/time_defs.h b/lib/time/time_defs.h
new file mode 100644
index 00000000..fd8fd4f3
--- /dev/null
+++ b/lib/time/time_defs.h
@@ -0,0 +1,30 @@
+#pragma once
+#include <time.h>
+#include <sys/time.h>
+
+typedef struct timeval Time;
+
+static OptionalText_t _local_timezone = NONE_TEXT;
+
+static INLINE Text_t num_format(long n, const char *unit)
+{
+    if (n == 0)
+        return Text("now");
+    return Text$format((n == 1 || n == -1) ? "%ld %s %s" : "%ld %ss %s", n < 0 ? -n : n, unit, n < 0 ? "ago" : "later");
+}
+
+static void set_local_timezone(Text_t tz)
+{
+    setenv("TZ", Text$as_c_string(tz), 1);
+    _local_timezone = tz;
+    tzset();
+}
+
+#define WITH_TIMEZONE(tz, body) ({ if (tz.length >= 0) { \
+        OptionalText_t old_timezone = _local_timezone; \
+        set_local_timezone(tz); \
+        body; \
+        set_local_timezone(old_timezone); \
+    } else { \
+        body; \
+    }})
-- 
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