id: explore
image: base
title: Exploring Files
instruction: |
  In this quest, you will learn:
  1. How to list folder contents with `ls`
  2. How to move between folders with `cd`

requirements:
  - get-started

stages:
  - id: start
    name: Click `Start` to begin the lesson
    condition:
      command: ^echo start$
    response:
      content: |
        The terminal has no graphical interface for browsing folder contents.
        Instead, you can use `ls` to list what is inside a folder.
        `ls` is short for list. Its first character is a lowercase L.
        When you enter `ls`, the terminal lists the files and folders in your current folder.
        Now enter `ls` to see what is in this folder.
      hint: Enter `ls` to list the contents of the folder

  - id: ls
    name: List the files in the folder
    requirements:
      - start
    condition:
      command: ^ls$
    exceptions:
      - id: wrong_directory
        condition:
          not:
            pwd: /home/commander
        response:
          type: narrative
          content: |
            First, return to `/home/commander/`
            Enter `cd ~` to return to `/home/commander/`
    response:
      content: |
        You should now see the contents of the folder.
        The file tree on the right has changed too.
        This folder contains two folders named `folder1` and `folder2`.

        Next, let's learn how to enter a folder.
        `cd` is short for change directory, which means changing your current folder.
        Enter `cd [folder name]` to move into a folder.
        For example, enter `cd folder1` to move into `folder1`.
        Now enter the `folder1` folder.
      hint: Enter `cd folder1` to move into `folder1`

  - id: cd-folder1
    name: Enter `folder1`
    requirements:
      - ls
    condition:
      pwd: /home/commander/folder1
    exceptions:
      - id: wrong_spelling
        condition:
          command: ^folderl$
        response:
          type: narrative
          content: |
            `folder1` ends with the number `1`, not the letter `l`.
      - id: wrong_directory
        condition:
          pwd: /home/commander
        response:
          type: narrative
          content: Enter `cd folder1` to move into `folder1`
      - id: not_in_home
        condition:
          not:
            pwd: /home/commander
        response:
          type: narrative
          content: |
            First, return to `/home/commander/`
            Enter `cd ~` to return to `/home/commander/`
            Then enter `cd folder1` to move into `folder1`
    response:
      content: |
        You have entered the `folder1` folder.
        Notice that the command prompt has changed from
        `commander:~ $` to
        `commander:~/folder1 $`.
        This tells you that you are now in `folder1`.
        Now list the contents of `folder1`.
      hint: Enter `ls` to list the contents of the folder

  - id: ls-folder1
    name: List the contents of `folder1`
    requirements:
      - cd-folder1
    condition:
      pwd: /home/commander/folder1
      command: ^ls$
    response:
      content: |
        You can see two files in `folder1`, named `file1.txt` and `file2.txt`.
        Now let's leave `folder1` and return to the original folder.
        Use `cd ..` to move up to the parent folder.
        Here, `..` means the parent folder.
      hint: Enter `cd ..` to move up to the parent folder

  - id: cd_up
    name: Return to the parent folder
    requirements:
      - ls-folder1
    condition:
      pwd: /home/commander
    response:
      content: |
        You have returned to the parent folder.
        Use the commands you just learned to enter `folder2`, list its contents, and return to this folder.
      hint: |
        Use `cd` to move between folders
        Use `ls` to list the contents of a folder

  - id: cd-folder2
    name: Enter `folder2`
    requirements:
      - cd_up
    condition:
      pwd: /home/commander/folder2
    response:
      content: |
        You have entered the `folder2` folder.
        Now list the contents of `folder2`.
      hint: Use `ls` to list the contents of the folder

  - id: ls-folder2
    name: List the contents of `folder2`
    requirements:
      - cd-folder2
    condition:
      pwd: /home/commander/folder2
      command: ^ls$
    response:
      content: |
        You can see two files in `folder2`, named `file3.txt` and `file4.txt`.
        Now leave `folder2` and return to the original folder.
      hint: Use `cd ..` to move up to the parent folder

  - id: END
    name: Return to the original folder
    requirements:
      - ls-folder2
    condition:
      pwd: /home/commander
    response:
      content: |
        You have returned to the original folder.
        Congratulations! You now know how to use `ls` and `cd`.
      hint: |
        Use `cd` to move between folders
        Use `ls` to list the contents of a folder