niet

Get data from yaml file directly in your shell

Install

$ pip install niet

Requirements

• Python 2.7+

Usage

With YAML file

Consider the yaml file with the following content:

# /path/to/your/file.yaml
project:
    meta:
        name: my-project
    foo: bar
    list-items:
        - item1
        - item2
        - item3

You can retrieve data from this file by using niet like this:

$ niet /path/to/your/file.yaml "project.meta.name"
my-project
$ niet /path/to/your/file.yaml "project.foo"
bar
$ niet /path/to/your/file.yaml "project.list-items"
item1 item2 item3
$ # assign return value to shell variable
$ NAME=$(niet /path/to/your/file.yaml "project.meta.name")
$ echo $NAME
my-project

With JSON file

Consider the json file with the following content:

{
    "project": {
        "meta": {
            "name": "my-project"
        }
    },
    "foo": "bar",
    "list-items": [
        "item1",
        "item2",
        "item3"
    ]
}

You can retrieve data from this file by using niet like this:

$ niet /path/to/your/file.json "project.meta.name"
my-project
$ niet /path/to/your/file.json "project.foo"
bar
$ niet /path/to/your/file.json "project.list-items"
item1 item2 item3
$ # assign return value to shell variable
$ NAME=$(niet /path/to/your/file.json "project.meta.name")
$ echo $NAME
my-project

Deal with errors

When your JSON file content are not valid niet display an error and exit with return code 1

You can easily protect your script like this:

PROJECT_NAME=$(niet your-file.yaml project.meta.name)
if [ "$?" = "1" ]; then
    echo "Error occur ${PROJECT_NAME}"
else
    echo "Project name: ${PROJECT_NAME}"
fi

Examples

You can try niet by using the samples provided with the project sources code.

Sample example:

# tests/samples/sample.yaml
project:
    meta:
        name: project-sample
        tags:
          - example
          - sample
          - for
          - testing
          - purpose

Retrieve the project name:

$ niet tests/samples/sample.yaml project.meta.name
project-sample

Deal with list of items

$ for el in $(niet tests/samples/sample.yaml project.meta.tags); do echo ${el}; done
example
sample
for
testing
purpose

Tips

You can pass your search with or without quotes like this:

$ niet your-file.yaml project.meta.name
$ niet your-file.yaml "project.meta.name"

Contribute

If you want to contribute to niet please first read the contribution guidelines

Licence

This project is under the MIT License.

See the license file for more details

Hervé Beraud herveberaud.pro@gmail.com