A single line REPL for your favorite languages & libraries. Built on Docker.
This is currently usable & stable, and supports the
See TODO for future work.
replr <stack> <libraries...>
So for a simple
ruby REPL, including the
chronic gem, it would be:
replr ruby chronic
Or for a
python REPL, including the flask and requests packages, it would be:
replr python flask requests
You can also specify versions of stacks & libraries to install:
replr ruby:2.3.1 chronic:0.10.1 activesupport:5.1.0
That’s it! It’s very simple. Replr currently supports three stacks:
replr is built on Ruby and requires Ruby 2.5+ installed.
gem install replr
replr should now be available in your
will delete all docker images associated with replr. This saves space!
replr is built on Ruby and requires a Ruby 2.5+ installed to develop. It’s pretty easy to get started and add a stack, please see node’s implementation for a quick-start. There’s also a companion integration spec that tests expected behavior in node’s test suite that you should emulate and implement for every stack you make.
Most of the “scaffolding” around creating the REPL & dealing with docker’s implementation details have been abstracted away if you use the
Replr::Stack::REPLMaker class, so you only need to implement stack-specific functionality. This includes:
%%VERSION%%tags) for the stack.
set_filter_lines_for_install(example) to mask away unnecessary output during installation.
Note: if you want to run the specs (built with
minitest/spec), please do:
bundle exec rake test
replr uses docker to manage different stacks and installed libraries. It creates docker images that are tagged
replr-<stack>-<libraries...> for each stack and library combo you initiate.
The first time you start a new stack & library combo, docker will take some time to spin up instances. Future executions of the same stack should be near-instant.
This is how a full output from a replr install will look like the first time you try out a new stack & library combo:
❯ replr ruby chronic (1/25) Upgrading musl (1.1.14-r14 -> 1.1.14-r16) (2/25) Installing gmp (6.1.0-r0) (3/25) Installing libgcc (5.3.0-r0) (4/25) Installing libstdc++ (5.3.0-r0) (5/25) Installing libgmpxx (6.1.0-r0) (6/25) Installing gmp-dev (6.1.0-r0) (7/25) Installing libedit (20150325.3.1-r3) (8/25) Installing ruby-libs (2.3.7-r0) (9/25) Installing ruby-dev (2.3.7-r0) (10/25) Installing binutils-libs (2.26-r1) (11/25) Installing binutils (2.26-r1) (12/25) Installing isl (0.14.1-r0) (13/25) Installing libgomp (5.3.0-r0) (14/25) Installing libatomic (5.3.0-r0) (15/25) Installing mpfr3 (3.1.2-r0) (16/25) Installing mpc1 (1.0.3-r0) (17/25) Installing gcc (5.3.0-r0) (18/25) Installing make (4.1-r1) (19/25) Installing musl-dev (1.1.14-r16) (20/25) Installing libc-dev (0.7-r0) (21/25) Installing fortify-headers (0.8-r0) (22/25) Installing g++ (5.3.0-r0) (23/25) Installing build-base (0.4-r1) (24/25) Installing build-dependencies (0) (25/25) Upgrading musl-utils (1.1.14-r14 -> 1.1.14-r16) 1 gem installed Fetching gem metadata from https://rubygems.org/............. Installing chronic 0.10.2 Bundle complete! 1 Gemfile dependency, 2 gems now installed. Gems in the groups development and test were not installed. Bundled gems are installed into `/usr/local/bundle` irb(main):001:0>
The next time, it’s much cleaner:
❯ replr ruby chronic irb(main):001:0> Chronic.parse("tomorrow") => 2018-08-25 12:00:00 +0000 irb(main):002:0>
As you can see, replr tries its best to abstract away the underlying docker installation. You shouldn’t have to worry about Dockerfile & so on just to get a REPL!
It also tries its best to make sure libraries you mention are auto-required in the REPL, so you don’t have to do any additional work!