add compiled features into --version output (#462)

a lot of application which allow selecting features at build time seem
to output the build config with `--version` or similar (e.g ffmpeg).

aside from giving the user information about the feature set the binary
was compiled with (in case the user didn't compile it themselves, e.g on
a binary distro) it can also (possibly) help when submitting bug
reports.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/462
Reviewed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

1 files changed, 21 insertions, 0 deletions

diff --git a/options.c b/options.c
index ef874ac..89dfe20 100644
--- a/options.c
+++ b/options.c
@@ -50,6 +50,27 @@ void print_usage(void)
 static void print_version(void)
 {
 	printf("%s %s\n", progname, VERSION);
+	fputs("features: "
+#if HAVE_INOTIFY
+		"+inotify "
+#endif
+#if HAVE_LIBFONTS
+		"+statusbar "
+#endif
+#if HAVE_LIBEXIF
+		"+exif "
+#endif
+#if HAVE_IMLIB2_MULTI_FRAME
+		"+multiframe "
+#else
+	#if HAVE_LIBGIF
+		"+giflib "
+	#endif
+	#if HAVE_LIBWEBP
+		"+libwebp "
+	#endif
+#endif
+		"\n", stdout);
 }
 
 void parse_options(int argc, char **argv)