fix stdin2discord.bash screening problems, msg len measurement

stdin2discord.bash

@@ -9,18 +9,20 @@ send() {
 
     curl -X POST \
         -H "Content-Type: application/json" \
-        -d "{\"content\":\"$_msg\"}" \
+        -d "{\"content\":\"\`\`\`diff\n$_msg\`\`\`\"}" \
         "$DISCORD_WEBHOOK"
 }
 
 msg=""
 
 while IFS= read -r line; do
-    if [[ ${#msg}${#line} -ge 2000 ]]; then
+    line="$(sed 's@"@\\"@g' <<< "$line")"  # Json screening
+    len="$(wc -m <<< "$msg$line")"
+    if [[ $len -ge 1985 ]]; then
         send "$msg"
-        msg=""
+        msg="$line"
     else
-        msg+="$line"
+        msg+="$line\\n"
     fi
 done