Add feature to delete multiple tasks

Author: coderick14

README.md

@@ -43,6 +43,12 @@ tusker show
      2	❌      Fill rems                        25 April 2018 11:53:25
 ```
 
+- Delete multiple tasks from the list
+```
+tusker del 1 3
+tusker show
+     1	❌      Collect NOC certificate          25 April 2018 11:53:23
+```
 ### What's the difference between `check` and `del`?
 Use `del` if you'd *never* like to look back at a completed task.  
 Use `check` if you want the satisfaction of seeing the ✓  beside your completed task for a while.

tusker

@@ -20,7 +20,7 @@ check_args() {
         return
     fi
 
-    if [ $# -gt 1 ] && [ "$1" = "add" ]; then
+    if [ $# -gt 1 ] && ([ "$1" = "add" ] || [ "$1" = "del" ]); then
         return
     fi
 
@@ -46,8 +46,12 @@ add_task() {
 }
 
 delete_task() {
-    task_id=$1
-    sed -i -e "$task_id""d" "$FILE_NAME"
+    format_str=""
+    for task_id in "$@"
+    do
+        format_str="$task_id""d;""$format_str"
+    done
+    sed -i -e "$format_str" "$FILE_NAME"
 }
 
 check_task() {
@@ -86,8 +90,9 @@ main() {
         ;;
 
         del)
-        delete_task "$2"
-        printf "Task deleted\n"
+        shift
+        delete_task "$@"
+        printf "Task(s) deleted\n"
         ;;
 
         check)