From 9e1bd6b864a1bc88e8b61baf177461ec1b116da3 Mon Sep 17 00:00:00 2001
From: Ching-Yi Lee <chingyi8181@gmail.com>
Date: Sun, 20 Dec 2020 00:52:54 +0800
Subject: [PATCH] add version check

---
 generate-epub.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/generate-epub.sh b/generate-epub.sh
index 18690fbb..03e7f099 100755
--- a/generate-epub.sh
+++ b/generate-epub.sh
@@ -34,18 +34,29 @@ generate () {
   cat $name.md | generate_from_stdin $name.epub $language
 }
 
+
 # Check if depencies exist
 check_dependencies () {
+  ITER=-1
   for dependency in "${dependencies[@]}"
   do
+    ITER=$(expr $ITER + 1)
     if ! [ -x "$(command -v $dependency)" ]; then
       echo "Error: $dependency is not installed." >&2
       exit 1
+    else
+      requiredver="${dependencies_minimun_version[ITER]}"
+      currentver=$($dependency --version | head -1 | cut -d " " -f 2)
+      if [ "$(printf '%s\n' "$requiredver" "$currentver" | sort -V | head -n1)" != "$requiredver" ]; then
+      echo "$dependency verion must be >= ${requiredver}"
+      exit 1
+      fi
     fi
   done
 }
 
 dependencies=("pandoc")
+dependencies_minimun_version=("2.3")
 
 check_dependencies
 generate_with_solutions