From 72e44d596f16127f208221d8b455588bd03134e4 Mon Sep 17 00:00:00 2001
From: Max Kellermann <max@duempel.org>
Date: Thu, 22 Jan 2015 19:10:15 +0100
Subject: [PATCH] tag/Format: add %iso8601%
---
doc/user.xml | 5 +++++
src/tag/Format.cxx | 27 +++++++++++++++++++++++++++
2 files changed, 32 insertions(+)
diff --git a/doc/user.xml b/doc/user.xml
index 3fe293ab9..9d95b2864 100644
--- a/doc/user.xml
+++ b/doc/user.xml
@@ -3192,6 +3192,11 @@ buffer_size: 16384</programlisting>
<para>
An alternative to <varname>path</varname> which
provides a format string referring to tag values.
+
+ The special tag <varname>iso8601</varname> emits
+ the current date and time in <ulink
+ url="https://en.wikipedia.org/wiki/ISO_8601">ISO8601</ulink>
+ format (UTC).
Every time a new song starts or a new tag gets
received from a radio station, a new file is
opened. If the format does not render a file
diff --git a/src/tag/Format.cxx b/src/tag/Format.cxx
index 3fdcc7db6..de4db57ef 100644
--- a/src/tag/Format.cxx
+++ b/src/tag/Format.cxx
@@ -26,6 +26,7 @@
#include <algorithm>
#include <string.h>
+#include <time.h>
struct FormatTagContext {
const Tag &tag;
@@ -82,6 +83,32 @@ TagGetter(const void *object, const char *name)
{
const auto &_ctx = *(const FormatTagContext *)object;
auto &ctx = const_cast<FormatTagContext &>(_ctx);
+
+ if (strcmp(name, "iso8601") == 0) {
+ time_t t = time(nullptr);
+#ifdef WIN32
+ const struct tm *tm2 = gmtime(&t);
+#else
+ struct tm tm;
+ const struct tm *tm2 = gmtime_r(&t, &tm);
+#endif
+ if (tm2 == nullptr)
+ return "";
+
+ strftime(ctx.buffer, sizeof(ctx.buffer),
+#ifdef WIN32
+ /* kludge: use underscore instead of colon on
+ Windows because colons are not allowed in
+ file names, and this library is mostly
+ used to generate file names */
+ "%Y-%m-%dT%H_%M_%SZ",
+#else
+ "%FT%TZ",
+#endif
+ tm2);
+ return ctx.buffer;
+ }
+
const Tag &tag = ctx.tag;
TagType tag_type = tag_name_parse_i(name);