printf: Add %w and %Wk for file birth times

%w and %W were chosen to match the format specifiers for file birth
times from stat(1)

1 files changed, 6 insertions, 0 deletions

diff --git a/tests.sh b/tests.sh
index 0585ff4..de0afb7 100755
--- a/tests.sh
+++ b/tests.sh
@@ -394,6 +394,7 @@ bfs_tests=(
     test_execdir_plus
     test_hidden
     test_nohidden
+    test_printf_w
     test_path_flag_expr
     test_path_expr_flag
     test_flag_expr_path
@@ -1290,6 +1291,11 @@ function test_printf_nul() {
     fi
 }
 
+function test_printf_w() {
+    # Birth times may not be supported, so just check that %w/%W can be parsed
+    bfs_diff times -false -printf '%w %WY\n'
+}
+
 function test_fstype() {
     fstype="$(invoke_bfs -printf '%F\n' | head -n1)"
     bfs_diff basic -fstype "$fstype"