Simple Python configuration management
Project description
# Marten
[![Build Status](https://travis-ci.org/nick-allen/marten.svg?branch=master)](https://travis-ci.org/nick-allen/marten)
[![Coverage Status](https://coveralls.io/repos/nick-allen/marten/badge.svg?branch=master&service=github)](https://coveralls.io/github/nick-allen/marten?branch=master)
Simple Python configuration management
Inspired by [node config](https://www.npmjs.com/package/config), if you've used it before, Marten will feel familiar
with a couple of extras
Tested with Python 2.7 and 3.5
---
# Install
```
> pip install marten
```
# Usage
Marten provides several ways to load configurations, the simplest being the bundled config automatically
created by Marten using files found in the `.marten/` directory
```
> mkdir .marten
> echo "EXAMPLE = True" > .marten/default.py
> marten
{
"EXAMPLE": true
}
```
The `marten` command outputs the fully parsed content of the bundled Marten config in JSON format
The bundled config is available in Python at `marten.config`, and can be accessed like a normal dictionary
```
> python
>>> from marten import config
>>> config['EXAMPLE']
True
```
# Features
## Swappable Configurations
Marten can easily swap between different configurations using the `MARTEN_ENV` environment variable
The `MARTEN_ENV` variable defaults to `default`
```
> marten
{
"EXAMPLE": true
}
> echo "SECOND_FILE = 'This is a different environment'" > .marten/two.py
> echo "THIRD_FILE = 'This is a third environment'" > .marten/three.py
> MARTEN_ENV=two marten
{
"SECOND_FILE": "This is a different environment"
}
> MARTEN_ENV=three marten
{
"THIRD_FILE": "This is a third environment"
}
```
## Full Python
The configuration files are not parsed, but are imported as Python modules
Only capitalized variables not starting with underscores are read into the configuration, allowing other variables
to be used for logic and setup
```
> echo "a = 1; _B = 2; FULL_PYTHON = a + _B == 3" > .marten/python.py
> MARTEN_ENV=python marten
{
"FULL_PYTHON": true
}
```
## Multiple File Formats
Marten is not limited to Python files
```
> echo '{"KEY": "value"}' > .marten/formats.json
> MARTEN_ENV=formats marten
{
"KEY": "value"
}
```
Current supported formats:
* Python
* JSON
* YAML
## Environment Variable Expansion
Environment variables in values with the format `$VAR` or `${VAR}` are automatically expanded
Unset environment variables are unmodified
```
> echo '{"REPLACED1": "This ${ENV}", "REPLACED2": "Second $ENV", "IGNORED": "${MISSING}"}' > .marten/environ.json
> MARTEN_ENV=environ ENV=value marten
{
"IGNORED": "${MISSING}",
"REPLACED1": "This value",
"REPLACED2": "Second value"
}
```
## Merge Multiple Files
Since Marten operates on filename and extension separately, two files with the same name but different extensions
are merged together in the order they are loaded
```
> echo 'PYTHON = True' > .marten/merge.py
> echo '{"JSON": true}' > .marten/merge.json
> echo 'YAML: true' > .marten/merge.yaml
> MARTEN_ENV=merge marten
{
"JSON": true,
"PYTHON": true,
"YAML": true
}
```
[![Build Status](https://travis-ci.org/nick-allen/marten.svg?branch=master)](https://travis-ci.org/nick-allen/marten)
[![Coverage Status](https://coveralls.io/repos/nick-allen/marten/badge.svg?branch=master&service=github)](https://coveralls.io/github/nick-allen/marten?branch=master)
Simple Python configuration management
Inspired by [node config](https://www.npmjs.com/package/config), if you've used it before, Marten will feel familiar
with a couple of extras
Tested with Python 2.7 and 3.5
---
# Install
```
> pip install marten
```
# Usage
Marten provides several ways to load configurations, the simplest being the bundled config automatically
created by Marten using files found in the `.marten/` directory
```
> mkdir .marten
> echo "EXAMPLE = True" > .marten/default.py
> marten
{
"EXAMPLE": true
}
```
The `marten` command outputs the fully parsed content of the bundled Marten config in JSON format
The bundled config is available in Python at `marten.config`, and can be accessed like a normal dictionary
```
> python
>>> from marten import config
>>> config['EXAMPLE']
True
```
# Features
## Swappable Configurations
Marten can easily swap between different configurations using the `MARTEN_ENV` environment variable
The `MARTEN_ENV` variable defaults to `default`
```
> marten
{
"EXAMPLE": true
}
> echo "SECOND_FILE = 'This is a different environment'" > .marten/two.py
> echo "THIRD_FILE = 'This is a third environment'" > .marten/three.py
> MARTEN_ENV=two marten
{
"SECOND_FILE": "This is a different environment"
}
> MARTEN_ENV=three marten
{
"THIRD_FILE": "This is a third environment"
}
```
## Full Python
The configuration files are not parsed, but are imported as Python modules
Only capitalized variables not starting with underscores are read into the configuration, allowing other variables
to be used for logic and setup
```
> echo "a = 1; _B = 2; FULL_PYTHON = a + _B == 3" > .marten/python.py
> MARTEN_ENV=python marten
{
"FULL_PYTHON": true
}
```
## Multiple File Formats
Marten is not limited to Python files
```
> echo '{"KEY": "value"}' > .marten/formats.json
> MARTEN_ENV=formats marten
{
"KEY": "value"
}
```
Current supported formats:
* Python
* JSON
* YAML
## Environment Variable Expansion
Environment variables in values with the format `$VAR` or `${VAR}` are automatically expanded
Unset environment variables are unmodified
```
> echo '{"REPLACED1": "This ${ENV}", "REPLACED2": "Second $ENV", "IGNORED": "${MISSING}"}' > .marten/environ.json
> MARTEN_ENV=environ ENV=value marten
{
"IGNORED": "${MISSING}",
"REPLACED1": "This value",
"REPLACED2": "Second value"
}
```
## Merge Multiple Files
Since Marten operates on filename and extension separately, two files with the same name but different extensions
are merged together in the order they are loaded
```
> echo 'PYTHON = True' > .marten/merge.py
> echo '{"JSON": true}' > .marten/merge.json
> echo 'YAML: true' > .marten/merge.yaml
> MARTEN_ENV=merge marten
{
"JSON": true,
"PYTHON": true,
"YAML": true
}
```
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