name = "todo_manager"
category = "filesystem"
mode = "convert"
description = """
A simple todo list manager. Read commands from stdin, one per line:
  add <task text>   — append the task to the todo file
  list              — print all tasks numbered as "NN). <task>"
  remove <N>        — remove task number N (1-based)
  clear             — remove all tasks

The todo file is "todo.txt" in the working directory.
When listing, pad task numbers to two digits (01, 02, …).
After "add" or "remove", automatically list the remaining tasks.
If the list is empty, print "No tasks found".
"""

bash_source = '''
#!/bin/bash
TODOFILE="./todo.txt"

list_tasks() {
  if [ -f "$TODOFILE" ] && [ -s "$TODOFILE" ]; then
    count=1
    IFS=$'\\n'
    while read -r task; do
      num=$count
      if [ $count -lt 10 ]; then num="0$count"; fi
      echo "$num). $task"
      count=$(( count + 1 ))
    done < "$TODOFILE"
  else
    echo "No tasks found"
  fi
}

add_task() {
  echo "$1" >> "$TODOFILE"
}

remove_task() {
  taskNum=$1
  totalLines=$(wc -l < "$TODOFILE" | tr -d ' ')
  if [ "$taskNum" -gt "$totalLines" ] 2>/dev/null; then
    echo "Error: task number $taskNum does not exist!"
    return 1
  fi
  tmpfile="./todo_tmp.txt"
  count=1
  IFS=$'\\n'
  while read -r task; do
    if [ "$count" -ne "$taskNum" ]; then
      echo "$task" >> "$tmpfile"
    fi
    count=$(( count + 1 ))
  done < "$TODOFILE"
  if [ -f "$tmpfile" ]; then
    mv "$tmpfile" "$TODOFILE"
  else
    > "$TODOFILE"
  fi
  echo "Sucessfully removed task number $taskNum"
}

clear_tasks() {
  > "$TODOFILE"
  echo "Tasks cleared."
}

if [ ! -f "$TODOFILE" ]; then
  touch "$TODOFILE"
fi

while IFS= read -r line || [[ -n "$line" ]]; do
  cmd=$(echo "$line" | cut -d' ' -f1)
  arg=$(echo "$line" | cut -d' ' -f2-)
  case "$cmd" in
    add)
      add_task "$arg"
      list_tasks
      ;;
    list)
      list_tasks
      ;;
    remove)
      remove_task "$arg"
      list_tasks
      ;;
    clear)
      clear_tasks
      ;;
  esac
done
'''

[[test_cases]]
description = "Add tasks then list"
stdin = """add Buy groceries
add Walk the dog
list"""
expected_stdout = """01). Buy groceries
01). Buy groceries
02). Walk the dog
01). Buy groceries
02). Walk the dog"""

[[test_cases]]
description = "Add, remove, list"
stdin = """add First task
add Second task
add Third task
remove 2
list"""
expected_stdout = """01). First task
01). First task
02). Second task
01). First task
02). Second task
03). Third task
Sucessfully removed task number 2
01). First task
02). Third task
01). First task
02). Third task"""

[[test_cases]]
description = "Empty list and clear"
stdin = """list
add Something
clear
list"""
expected_stdout = """No tasks found
01). Something
Tasks cleared.
No tasks found"""

[[test_cases]]
description = "Works with pre-existing todo file"
stdin = """list
add Third item
list"""
setup_files = { "todo.txt" = "Existing item one\nExisting item two\n" }
expected_stdout = """01). Existing item one
02). Existing item two
01). Existing item one
02). Existing item two
03). Third item
01). Existing item one
02). Existing item two
03). Third item"""
expected_files = { "todo.txt" = "Existing item one\nExisting item two\nThird item\n" }