fix bad sed in db

lib/db.sh

@@ -2,8 +2,6 @@
 
 FILE_TRASH="/dev/null"
 DB_PATH="./data/"
-SED_DARWIN="''"
-
 
 # errors :
 # 1 file do not exist
@@ -28,7 +26,6 @@ function add_in_db {
     shift 1
     
     local IFS=";"
-    echo add
     echo "$*" >> ${DB_PATH}${db_name}.db
     return 0
 
@@ -39,7 +36,10 @@ function delete_in_db {
     db_name="${1}"
     id="${2}"
 
-    sed -i ${SED_DARWIN} "/^${id}/d" "${DB_PATH}${db_name}.db"
+    [ "$(uname)" == "Darwin" ] \
+        && sed "/^${id}/d" "${DB_PATH}${db_name}.db" -i '' \
+        || sed "/^${id}/d" "${DB_PATH}${db_name}.db" -i
+    
     return 0
 
 }