Welcome to Nim
Nim is a statically typed, imperative programming language that tries to give the programmer ultimate power without compromises on runtime efficiency. This means it focuses on compile-time mechanisms in all their various forms.
Beneath a nice infix/indentation based syntax with a powerful (AST based, hygienic) macro system lies a semantic model that supports a soft realtime GC on thread local heaps. Asynchronous message passing is used between threads, so no "stop the world" mechanism is necessary. An unsafe shared memory heap is also provided for the increased efficiency that results from that model.
Tags indicate Nim versions, base images, and flavors. For example,
nimlang/nim:0.16.0-ubuntu-regular means Nim version 0.16.0, based on Ubuntu, with Nimble installed. Ubuntu is the default base, so you can omit it in the tag:
nimlang/nim:0.16.0-regular. Regular is the default flavor, so you can omit it as well:
nimlang/nim:0.16.0. The latest Nim version is additionally tagged as
nimlang/nim:latest. And since Docker adds
latest automatically, you can just write
So, all together:
nimlang/nim = nimlang/nim:latest = nimlang/nim:0.16.0 = nimlang/nim:0.16.0-ubuntu =nimlang/nim:latest-ubuntu = nimlang/nim:0.16.0-regular = nimlang/nim:latest-regular = nimlang/nim:0.16.0-ubuntu-regular = nimlang/nim:latest-ubuntu-regular
Phew, that's one long list! Fortunately, unless you need a specific version of Nim, you'll probably need just
There are currently two bases: Ubuntu and Alpine. Ubuntu is the default one.
Images come in three flavors: slim, regular, and onbuild. Slim images include only the Nim compiler. Regular images include the compiler and Nimble package manager. Onbuild images are meant to be used in Dockerfiles for Nimble packages.
Using the Images
Get the Latest Version
$ docker pull nimlang/nim
$ docker pull nimlang/nim:devel
Compiling a Single File
$ docker run --rm -v `pwd`:/usr/src/app -w /usr/src/app nimlang/nim nim c -r myapp.nim
Compiling a Static Single File
$ docker run --rm -v `pwd`:/usr/src/app -w /usr/src/app nimlang/nim:alpine nim c --passL:"-static -no-pie" myapp.nim
Building a Nimble Package
Create a Dockerfile in the package root:
FROM nimlang/nim:onbuild ENTRYPOINT ["./mycompiledbinary"]
Build your image and run the compiled binary:
$ docker build -t myapp . $ docker run --rm myapp