YAML parser from bash

Question

I am developing a pre-prod server for a Symfony2 app

I made a little hook script to update all of my git repositories which contain a Symfony app.

# ...

# Save old database
DATABASE_NAME=`YAML Parser Command` 'app/config/parameters.yml' database_name
TODAY=`date +"%Y-%m-%d-%H:%M:%S"`
logger -t "Update website Symfony2" "Save SQL in $TODAY.sql"
mysqldump $DATABASE_NAME > sqlSave/$TODAY.sql 2>&1 | logger -t "Update website Symfony2"
# Update database with doctrine
php app/console doctrine:schema:update --force  2>&1 | logger -t "Update website Symfony2"

# ...

How can I have access to the database name on this script ?

My server is on Debian. Is there a package to parse YAML?

Answer 1

You can parse yaml/json file directly in your shell/bash with niet.

Easy to install and easy to use:

$ pip install -U niet

Consider the following example:

$ cat dump.yaml
foo:
  bar:
    key: value
  baz:
    key: value
  tags:
    - one
    - two

You can parse this example file like this:

  $ niet dump.yaml foo.bar.key
  value
  $ for el in $(niet dump.yaml foo.tags); do echo ${el}; done
  one
  two

Niet have a good integration with shell and others bash like.

Niet yaml parser documentation, source code, and samples.