From 97e0ab7de5f92b375715cc5c3e082fccdb809b13 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Sat, 10 Mar 2018 19:35:49 +0800
Subject: Add DEBUG var, debug() and warn() functions

---
 dfly-update | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/dfly-update b/dfly-update
index 33f2cbf..c76d45e 100755
--- a/dfly-update
+++ b/dfly-update
@@ -9,6 +9,8 @@
 
 set -e
 
+DEBUG=${DEBUG:-""}
+
 NAME="dfly-update"
 VERSION="0.?.?"
 TOOLDIR="${0%/*}"
@@ -41,6 +43,14 @@ UPDATE_BRANCH=
 # Helper Functions
 #
 
+debug() {
+    [ -n "${DEBUG}" ] && echo "DEBUG: $@" >&2
+}
+
+warn() {
+    echo "WARNING: $@" >&2
+}
+
 error() {
     echo "ERROR: $@" >&2
 }
-- 
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