{
  "format": "evn-blocks",
  "version": 3,
  "title": "Files: every block",
  "needs": "nothing but the board",
  "description": "Every file block once: a fresh start (delete), writing a line, adding more in a loop the way a log grows, reading the file back, asking whether it exists, listing the files, and deleting it again, so the board is left as it was. The board does not write its flash while a motor drives: keep the values in variables during a move and write them after it.",
  "workspace": {
    "blocks": {
      "languageVersion": 0,
      "blocks": [
        {
          "type": "evn_setup_start",
          "x": 30,
          "y": 30
        },
        {
          "type": "evn_program_start",
          "x": 30,
          "y": 100,
          "next": {
            "block": {
              "type": "evn_file_delete",
              "inputs": {
                "NAME": {
                  "shadow": {
                    "type": "text",
                    "fields": {
                      "TEXT": "notes.txt"
                    }
                  }
                }
              },
              "next": {
                "block": {
                  "type": "text_print",
                  "inputs": {
                    "TEXT": {
                      "block": {
                        "type": "text_join",
                        "inputs": {
                          "ADD0": {
                            "shadow": {
                              "type": "text",
                              "fields": {
                                "TEXT": "notes.txt exists: "
                              }
                            }
                          },
                          "ADD1": {
                            "block": {
                              "type": "evn_file_exists",
                              "inputs": {
                                "NAME": {
                                  "shadow": {
                                    "type": "text",
                                    "fields": {
                                      "TEXT": "notes.txt"
                                    }
                                  }
                                }
                              }
                            }
                          }
                        },
                        "extraState": {
                          "itemCount": 2
                        }
                      }
                    }
                  },
                  "next": {
                    "block": {
                      "type": "evn_file_write",
                      "fields": {
                        "MODE": "w"
                      },
                      "inputs": {
                        "NAME": {
                          "shadow": {
                            "type": "text",
                            "fields": {
                              "TEXT": "notes.txt"
                            }
                          }
                        },
                        "TEXT": {
                          "shadow": {
                            "type": "text",
                            "fields": {
                              "TEXT": "line one"
                            }
                          }
                        }
                      },
                      "next": {
                        "block": {
                          "type": "evn_file_write",
                          "fields": {
                            "MODE": "a"
                          },
                          "inputs": {
                            "NAME": {
                              "shadow": {
                                "type": "text",
                                "fields": {
                                  "TEXT": "notes.txt"
                                }
                              }
                            },
                            "TEXT": {
                              "shadow": {
                                "type": "text",
                                "fields": {
                                  "TEXT": "line two"
                                }
                              }
                            }
                          },
                          "next": {
                            "block": {
                              "type": "controls_for",
                              "fields": {
                                "VAR": {
                                  "id": "v_count"
                                }
                              },
                              "inputs": {
                                "FROM": {
                                  "shadow": {
                                    "type": "math_number",
                                    "fields": {
                                      "NUM": 1
                                    }
                                  }
                                },
                                "TO": {
                                  "shadow": {
                                    "type": "math_number",
                                    "fields": {
                                      "NUM": 3
                                    }
                                  }
                                },
                                "BY": {
                                  "shadow": {
                                    "type": "math_number",
                                    "fields": {
                                      "NUM": 1
                                    }
                                  }
                                },
                                "DO": {
                                  "block": {
                                    "type": "evn_file_write",
                                    "fields": {
                                      "MODE": "a"
                                    },
                                    "inputs": {
                                      "NAME": {
                                        "shadow": {
                                          "type": "text",
                                          "fields": {
                                            "TEXT": "notes.txt"
                                          }
                                        }
                                      },
                                      "TEXT": {
                                        "block": {
                                          "type": "text_join",
                                          "inputs": {
                                            "ADD0": {
                                              "shadow": {
                                                "type": "text",
                                                "fields": {
                                                  "TEXT": "count "
                                                }
                                              }
                                            },
                                            "ADD1": {
                                              "block": {
                                                "type": "variables_get",
                                                "fields": {
                                                  "VAR": {
                                                    "id": "v_count"
                                                  }
                                                }
                                              }
                                            }
                                          },
                                          "extraState": {
                                            "itemCount": 2
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              },
                              "next": {
                                "block": {
                                  "type": "text_print",
                                  "inputs": {
                                    "TEXT": {
                                      "block": {
                                        "type": "text_join",
                                        "inputs": {
                                          "ADD0": {
                                            "shadow": {
                                              "type": "text",
                                              "fields": {
                                                "TEXT": "notes.txt exists now: "
                                              }
                                            }
                                          },
                                          "ADD1": {
                                            "block": {
                                              "type": "evn_file_exists",
                                              "inputs": {
                                                "NAME": {
                                                  "shadow": {
                                                    "type": "text",
                                                    "fields": {
                                                      "TEXT": "notes.txt"
                                                    }
                                                  }
                                                }
                                              }
                                            }
                                          }
                                        },
                                        "extraState": {
                                          "itemCount": 2
                                        }
                                      }
                                    }
                                  },
                                  "next": {
                                    "block": {
                                      "type": "text_print",
                                      "inputs": {
                                        "TEXT": {
                                          "block": {
                                            "type": "evn_file_read",
                                            "inputs": {
                                              "NAME": {
                                                "shadow": {
                                                  "type": "text",
                                                  "fields": {
                                                    "TEXT": "notes.txt"
                                                  }
                                                }
                                              }
                                            }
                                          }
                                        }
                                      },
                                      "next": {
                                        "block": {
                                          "type": "text_print",
                                          "inputs": {
                                            "TEXT": {
                                              "block": {
                                                "type": "text_join",
                                                "inputs": {
                                                  "ADD0": {
                                                    "shadow": {
                                                      "type": "text",
                                                      "fields": {
                                                        "TEXT": "files on the board: "
                                                      }
                                                    }
                                                  },
                                                  "ADD1": {
                                                    "block": {
                                                      "type": "evn_file_list"
                                                    }
                                                  }
                                                },
                                                "extraState": {
                                                  "itemCount": 2
                                                }
                                              }
                                            }
                                          },
                                          "next": {
                                            "block": {
                                              "type": "evn_file_delete",
                                              "inputs": {
                                                "NAME": {
                                                  "shadow": {
                                                    "type": "text",
                                                    "fields": {
                                                      "TEXT": "notes.txt"
                                                    }
                                                  }
                                                }
                                              },
                                              "next": {
                                                "block": {
                                                  "type": "text_print",
                                                  "inputs": {
                                                    "TEXT": {
                                                      "block": {
                                                        "type": "text_join",
                                                        "inputs": {
                                                          "ADD0": {
                                                            "shadow": {
                                                              "type": "text",
                                                              "fields": {
                                                                "TEXT": "after delete file: "
                                                              }
                                                            }
                                                          },
                                                          "ADD1": {
                                                            "block": {
                                                              "type": "evn_file_exists",
                                                              "inputs": {
                                                                "NAME": {
                                                                  "shadow": {
                                                                    "type": "text",
                                                                    "fields": {
                                                                      "TEXT": "notes.txt"
                                                                    }
                                                                  }
                                                                }
                                                              }
                                                            }
                                                          }
                                                        },
                                                        "extraState": {
                                                          "itemCount": 2
                                                        }
                                                      }
                                                    }
                                                  }
                                                }
                                              }
                                            }
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      ]
    },
    "variables": [
      {
        "name": "count",
        "id": "v_count"
      }
    ]
  }
}