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"""Example DAG demonstrating the usage of the BashOperator."""
from __future__ import annotations

import datetime

import pendulum

from airflow import DAG
from airflow.operators.bash import BashOperator
from airflow.operators.empty import EmptyOperator

with DAG(
    dag_id='example_bash_operator',
    schedule='0 0 * * *',
    start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
    catchup=False,
    dagrun_timeout=datetime.timedelta(minutes=60),
    tags=['example', 'example2'],
    params={"example_key": "example_value"},
) as dag:
    run_this_last = EmptyOperator(
        task_id='run_this_last',
    )

    # [START howto_operator_bash]
    run_this = BashOperator(
        task_id='run_after_loop',
        bash_command='echo 1',
    )
    # [END howto_operator_bash]

    run_this >> run_this_last

    for i in range(3):
        task = BashOperator(
            task_id='runme_' + str(i),
            bash_command='echo "{{ task_instance_key_str }}" && sleep 1',
        )
        task >> run_this

    # [START howto_operator_bash_template]
    also_run_this = BashOperator(
        task_id='also_run_this',
        bash_command='echo "ti_key={{ task_instance_key_str }}"',
    )
    # [END howto_operator_bash_template]
    also_run_this >> run_this_last

# [START howto_operator_bash_skip]
this_will_skip = BashOperator(
    task_id='this_will_skip',
    bash_command='echo "hello world"; exit 99;',
    dag=dag,
)
# [END howto_operator_bash_skip]
this_will_skip >> run_this_last

if __name__ == "__main__":
    dag.cli()
