# trigger

## Usage

`prism create trigger` is used to create and update the triggers YML configuration file. 

```
Usage: prism create trigger [-h] --type TYPE [--full-tb] [-l]

Create a triggers YML file at the TRIGGERS_YML_PATH in `prism_project.py`.

Options:
  -h, --help         show this help message and exit

Subcommand Options:
  --type TYPE        Trigger type. As of now, only acceptable value is `function`

General Options:
  --full-tb          Display the full traceback for errors in the project; default is False
  -l, --log-level    Log level, must be one of `info`, `warn`, `error`, or `debug`. Default is `info`
```

Here's what `prism create trigger` does under the hood:

1. Parses the `prism_project.py` file and gets the `TRIGGERS_YML_PATH` value. If this value isn't specified, then it defaults to the project directory.
2. It checks to see if `TRIGGERS_YML_PATH` exists
   * If it doesn't, it creates a file at `TRIGGERS_YML_PATH` and populates it with a trigger of type `--type`
   * If it does, it then adds a profile of type `--type` to the existing file

## Example

Here's what the output will look like in Terminal (if there are no errors in the project):

```
$ prism create trigger --type function
--------------------------------------------------------------------------------
<HH:MM:SS> | INFO  | Running with prism v0.1.9...
<HH:MM:SS> | INFO  | Found project directory at /Users/my_first_project
 
<HH:MM:SS> | INFO  | RUNNING EVENT 'parsing prism_project.py'................................................ [RUN]
<HH:MM:SS> | INFO  | FINISHED EVENT 'parsing prism_project.py'............................................... [DONE in 0.03s]
 
<HH:MM:SS> | INFO  | Setting up triggers...
 
<HH:MM:SS> | INFO  | Done!
--------------------------------------------------------------------------------
$ 
```

Here's what the `triggers.yml` file looks like after running the above command:

```yaml
# triggers.yml

triggers:
  <trigger name here>:
    type: function
    function: <import path to function>  # make sure your project has access to this import path via SYS_PATH_CONF!
    kwargs:  # this is optional!
      arg1: value1
```

## Required arguments

Here are the required arguments you must specify with `trigger`:

* `--type` : Trigger type. As of now, only type `function` is supported.

## Optional arguments

Here are the optional arguments you can run with `trigger`:

* `--full-tb` : Display full traceback if errors arise at any stage of the pipeline
* `--log-level`: Log level, one of `info`, `warn`, `error`, or `critical`.
* `--vars`: Prism variables as key-value pairs `key=value`. These overwrite any variable definitions in `prism_project.py`. All values are read as strings.
* `--context` : Prism variables as JSON. Cannot co-exist with `--vars`. These overwrite any variable definitions in `prism_project.py`.