preprocessor plans

1 files changed, 31 insertions, 0 deletions

diff --git a/examples/preprocessor.halk b/examples/preprocessor.halk
new file mode 100644
index 0000000..a9d8987
--- /dev/null
+++ b/examples/preprocessor.halk
@@ -0,0 +1,31 @@
+`
+   #def# #ID# [#VALUE#]    set a macro
+   #fed# #ID#              unset a macro
+
+   #cde# #VALUE#           leave code as is
+
+   #ddo# #ID?# #DIR#       if defined, don't skip next directive (Defined DO)
+   #udo# #ID?# #DIR#       if undefined, skip next directive (UnDefined Do)
+
+   #inc# #FPATH#           include a file
+
+   #ID#                    call a macro or flag
+`
+
+` example usage: `
+
+#def# #VERSION# #"31.4.1"#
+
+#ddo# #BSD#
+   #inc# #bsd_support.halk#
+
+#udo# #OS#
+   #run# #
+      some-error-func."os not specified";
+   #
+
+#def# #OSTYPE# #
+   os/shell."sysctl kernel.ostype"
+#
+
+io/print.#OSTYPE#