Let’s say you have a script that depends on many libraries / gem. How can you make sure the minimum version requirements are fulfilled?
Let’s look at a real-world example. If you run the pluto feed reader using the about option:
$ pluto about
It will print:
Gems versions:
- pakman 1.1.0
- fetcher 0.4.5
- feedparser 2.1.2
- feedfilter 1.1.1
- textutils 1.4.0
- logutils 0.6.1
- props 1.2.0
- pluto 1.3.4
- pluto-models 1.6.0
- pluto-update 1.6.3
- pluto-merge 1.1.0
- pluto-tasks 1.5.3
Now the challenge: Code a version_check( versions )
method to version check the minimum requirements and return - if any - the outdated
libraries and versions AND that passes the RubyQuizTest :-).
def version_check( versions )
# ...
end
Let’s say you run:
outdated = version_check(
['pakman', '1.1.0', Pakman::VERSION],
['fetcher', '0.4.5', Fetcher::VERSION],
['feedparser', '2.1.2', FeedParser::VERSION],
['feedfilter', '1.1.1', FeedFilter::VERSION],
['textutils', '1.4.0', TextUtils::VERSION],
['logutils', '0.6.1', LogKernel::VERSION],
['props', '1.2.0', Props::VERSION],
['pluto-models', '1.5.4', Pluto::VERSION],
['pluto-update', '1.6.3', PlutoUpdate::VERSION],
['pluto-merge', '1.1.0', PlutoMerge::VERSION] )
pp outdated
Where the version check record entries are 1) the name, 2) the minimum requirement and 3) the used version
e.g. Pluto::VERSION will become at runtime 1.5.3 or something - depending
on the installation / setup.
If all libraries are up-to-date this will result in an empty outdated list / array:
[]
And if some libraries are NOT matching the minimum requirement the version record will get returned in the outdated list / array resulting in, for example:
[['pluto-models', '1.5.4', '1.5.3'],
['pluto-update', '1.6.3', '1.4.1']]
Note: For the starter level the version in use MUST always be greater or equal to the minimum requirement version.
And the minimum requirement might be just a major (e.g. 2 same as 2.x.x)
or a major plus minor (e.g. 2.1 same as 2.1.x) version.
To qualify for solving the code challenge / puzzle you must pass the test:
require 'minitest/autorun'
class RubyQuizTest < MiniTest::Test
def test_version_check
# 1) name, 2) minimum requirement, 3) used version
versions_a =
[['pakman', '1.1.0', '1.1.1'],
['fetcher', '0.4.5', '0.5.4'],
['feedparser', '2.1.2', '2.2.1'],
['feedfilter', '1.1', '1.1.14'],
['textutils', '2', '2.0.5'],
['logutils', '0.6', '0.6.0'],
['props', '1.2.1', '1.3.0'],
['pluto-models', '1.5.4', '1.5.7'],
['pluto-update', '1.6', '2.0.0'],
['pluto-merge', '1.1.0', '1.2.0']]
versions_a_outdated = []
versions_b =
[['pakman', '1.1.0', '1.0.1'],
['fetcher', '0.4.5', '0.5.4'],
['feedparser', '2.1.2', '2.2.1'],
['feedfilter', '1.1', '1.1.1'],
['textutils', '2', '1.2.7'],
['logutils', '0.6', '0.6.0'],
['props', '1.2.1', '1.3.0'],
['pluto-models', '1.5.4', '1.5.7'],
['pluto-update', '1.6', '1.5.11'],
['pluto-merge', '1.1.0', '1.2.0']]
versions_b_outdated =
[['pakman', '1.1.0', '1.0.1'],
['textutils', '2', '1.2.7'],
['pluto-update', '1.6', '1.5.11']]
assert_equal versions_a_outdated,
version_check( versions_a )
assert_equal versions_b_outdated,
version_check( versions_b )
end
end
Start from scratch or, yes, use any library / gem you can find.
Post your code snippets on the “official” Ruby Quiz Channel, that is, the ruby-talk mailing list.
Happy list processing and version checking with Ruby.