1 files changed, 18 insertions, 0 deletions
diff --git a/core/lib b/core/lib
new file mode 100644
index 0000000..9892663
--- /dev/null
+++ b/core/lib
@@ -0,0 +1,18 @@
+#!/bin/sh
+# utility variables and functions
+XDG_CACHE_HOME="${XDG_CACHE_HOME:-$HOME/.cache}" # XDG basedir specification
+
+# this variable grows automatically as long as this file is included in each
+# subcommand
+export subcmd="$subcmd${subcmd:+ }$(basename "$0")"
+
+# print an error to stdout and exit
+err() {
+	echo "error: $*" >&2
+	echo "run \`$subcmd --help\` for options" >&2
+	exit 1
+}
+
+# debug:
+# bc() { tee /dev/stderr | /usr/bin/bc ; }
+