From f5f12eed551f6fcbf0040b13268c054c1d8786c6 Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Wed, 24 Jan 2018 13:46:20 +0800
Subject: dfly-update: implement compare_version() using "sort -V"

---
 dfly-update | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/dfly-update b/dfly-update
index 04cec61..7b8744e 100755
--- a/dfly-update
+++ b/dfly-update
@@ -129,12 +129,23 @@ get_version_filename() {
 }
 
 # Compare between two version strings
+# Parameters: ver1 ver2
 # Returns values:
-# * 0 : The two versions are the same
-# * 1 : The first version is older than the other one
-# * 2 : The first version is newer than the other one
+# * 0 : ver1 = ver2
+# * 1 : ver1 < ver2
+# * 2 : ver1 > ver2
 compare_version() {
-    echo 1
+    lcal ver1 ver2 ver_low
+    ver1="$1"
+    ver2="$2"
+    ver_low=$(echo -e "${ver1}\n${ver2}" | sort -V | head -n 1)
+    if [ "${ver1}" = "${ver2}" ]; then
+        echo 0
+    elif [ "${ver1}" = "${ver_low}" ]; then
+        echo 1
+    else
+        echo 2
+    fi
 }
 
 
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