Today I learned on Alexander Sulim

Getting a tool version from asdf (improved)

Thu, 05 Dec 2024 00:00:00 +0000

$ asdf current nodejs 2>&1 | awk '{print $2}'
22.11.0

Example: Print a version of Node.js managed by asdf.

Getting a tool version from asdf

Wed, 04 Dec 2024 00:00:00 +0000

$ asdf current nodejs 2>&1 | sed -e "s/ \{2,\}/ /g" | cut -d" " -f2
20.17.0

Example: Print a version of Node.js managed by asdf.

Running minitest without Rake

Mon, 11 Nov 2024 00:00:00 +0000

When it’s about writing tests for a Ruby project, I prefer minitest to anything else. It’s fast and doesn’t require to switch mental context to any domain-specific language (DSL). It’s just Ruby.

Because minitest allows to express tests using plain Ruby, Ruby is the only necessary tool to run those tests.

$ ruby -Ilib:test test/foo/test_foo_test.rb

Running minitest tests with Ruby.

That works fine for one file, but a bit tricky for multiple test files at once.

minitest comes with a Rake task to run all tests. However for small projects it might be to much to bring Rake just for that case.

So I wrote a script to run tests without anything but Ruby. It’s basically a wrapper around a test runner that comes with minitest.

How to use multiple arguments in shebang lines

Thu, 24 Oct 2024 00:00:00 +0000

env command allows to find a script’s interpreter when its location is a non-standard one. In scripts it’s recommended to use env in shebang lines to find the executable and run it.

#!/usr/bin/env ruby

puts "Hello, world."

Ruby interpreter is used without any option.

On GNU/Linux if it’s necessary to run a script’s interpreter with options, env has to be used with -S to pass options in shebang lines.

How to DRY Docker Compose files

Wed, 23 Oct 2024 00:00:00 +0000

extends attribute in Docker Compose files allows to reuse existing service definitions for other services. That makes it possible to DRY Compose files.

How to list Ruby gems in the bundle

Tue, 22 Oct 2024 00:00:00 +0000

Bundler, a Ruby package manager, provides two options to list gems in the bundle.