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Continuous Integration

We highly recommend that you incorporate continuous integration into your workflow if you haven't yet, and make Swimm a part of that integration. Once you do that, you'll have continuous documentation.

Our CLI tools can inform your build process of:

  • Documentation being out-of-sync
  • Documentation coverage falling below a configurable, defined value expressed as a score between 0.00 and 100.00.

Your build process can then decide what to do - block the build? open issues and set a due date? It's up to your team to decide what works best, but the debt won't just slide by quietly anymore.

Swimm also supports pre-commit hooks that run in your local repository when they're triggered by a commit. The pre-commit hooks are identical in functionality to the continuous integration hooks, the difference is they run only on your machine.

Examples for Github Actions, Bitbucket Pipelines, Travis and Husky can be found within the "Integrations" menu up top which is visible when you have any repository selected:

Swimm CI Options

Note: If you see any errors about git not properly being configured, make sure the CI image has the minimum config needed for git to work read-only

We never commit during the CI process, but Git needs an email and name configured to do most read operations as well.

Below are the example configs for all CI / pre-commit setups that we support, and an overview of how you could develop something to work on a custom CI server.

Github Actions#

Note that we don't want 'shallow' pulls where only the last few revisions are considered - Swimm needs a full clone of the entire history to work properly.

name: Swimmon: pull_requestjobs:  Verify:    runs-on: ubuntu-latest    steps:      - uses: actions/checkout@v2        with:          fetch-depth: 0 # pulling the commits history is required for the verification to function properly          ref: ${{ github.head_ref }} # making sure we have the latest head ref       - uses: swimmio/swimm-verify-action@v1.2

Bitbucket Pipelines#

image: atlassian/default-image:latestpipelines:  default:    - parallel:        - step:            name: Documentation            script:              - echo "Verifying documentation units"              - src=$(curl -s | grep 'browser_download_url.*packed-swimm-linux-cli' | cut -d '"' -f 4)              - wget -O swimm_cli $src              - chmod +x ./swimm_cli              - ./swimm_cli --version              - ./swimm_cli verify

Travis CI#

- curl -s | grep 'browser_download_url.*packed-swimm-linux-cli' | cut -d '"' -f 4 | wget -O swimm_cli -qi -- chmod +x ./swimm_cli- ./swimm_cli --version- ./swimm_cli verify


image: ubuntu:latest# We deliberately do not cache anythingtest_async: script:   - echo "Verifying documentation units"   - src=$(curl -s | grep 'browser_download_url.*packed-swimm-linux-cli' | cut -d '"' -f 4)   - wget -O swimm_cli $src   - chmod +x ./swimm_cli   - ./swimm_cli --version   - ./swimm_cli verify

Azure DevOps Pipelines#

Note that Microsoft no longer grants free parallel tasks to new Azure DevOps users; this was done in response to some folks abusing the build servers. Hence, you'll need to have been given a grant to continue using parallel jobs for free, or you need to be on a paid account.

Below is the YAML to configure the pipeline:

# Pipeline config to verify Swimm docs as in-sync# Copyright 2021 Swimm# License: MIT
trigger:- main
pool:  vmImage: ubuntu-latest
steps:- bash: |    echo "Verifying documentation units"    git config --global "Username"    git config --global ""    src=$(curl -s | grep 'browser_download_url.*packed-swimm-linux-cli' | cut -d '"' -f 4)    wget -O swimm_cli $src    chmod +x ./swimm_cli    ./swimm_cli --version    ./swimm_cli verify  displayName: "Swimm Verify"

Note that Git must have a minimal configuration even for read-only options like those that swimm verify runs, so make sure you provide a value for and (as we have done in the config) if your pipeline configs don't currently get those from the environment.

Please let us know if you encounter any issues with Azure DevOps Pipeline Integration.

Circle CI#

Swimm runs swimmingly on CircleCI! Here's an example .circleci/config.yml file that you can adapt to your needs. The most important part of it is the swimm-verify job definition:

# Use the latest 2.1 version of CircleCI pipeline process engine.# See: 2.1jobs:  swimm-verify:    docker:      - image: ubuntu:latest    steps:      - checkout      - run:          name: Run tests          command: |            git config --global "Pretend User"            git config --global ""            src=$(curl -s | grep 'browser_download_url.*packed-swimm-linux-cli' | cut -d '"' -f 4))            wget -O swimm_cli $src            chmod +x ./swimm_cli            ./swimm_cli --version            ./swimm_cli verifyworkflows:  sample:    jobs:      - swimm-verify

Ordinarily, your workflows: section will already be defined, just put - swimm-verify under one of the defined jobs, where you want it to run.


The best way to run on Jenkins is through a "Freestyle Project", formerly known as a "Workflow". You can set up a project called "Swimm Verification" and point it at your repository, with whatever triggers or timing you'd like. There are only a few things that you have to watch out for:

  1. You absolutely, positively must have Node JS installed on the worker, version 14 or later. If you're on a Debian-ish setup, here's a really good tutorial on how to install the Node LTS package. The gist is, add the official Node repo to your sources via curl -sL | sudo bash - - and then just apt-get install nodejs -- this will work even if you have an older version installed (e.g. Node 10)

  2. If you are using Jenkins' advanced clone configuration, make sure you disable the shallow pull option - Swimm is going to require that the entire history be present.

  3. You're going to need curl installed, which you can do via apt-get install curl

Once you have that done, under Build, select "Execute Shell" and paste the following commands:

echo "Verifying documentation units"git config --global "nobody"git config --global ""src=$(curl -s | grep 'browser_download_url.*swimm-cli' | cut -d '"' -f 4) wget -O swimm_cli $srcnode swimm_cli --version  node swimm_cli verify

You can put whatever logic you'd like following that, swimm verify will exit with a nonzero status if there's a problem. It's also up to you if you'd like to set up a project just for this, or just add it as the last step to an existing project - the scripts will all run the same.

Also note that we're not using GIT_COMMITTER_NAME or GIT_COMMITTER_EMAIL as they aren't always set. This doesn't matter, as Swimm never commits anything during the CI process - it's just the minimum config git requires in order to function. If you'd rather set them through Jenkins, it can be done through the "Additional Behaviours" option from the Git selection menu (as described in this Stack Overflow answer)


Add the following to your package.json file:

// package.json{ "scripts": {   "pre-commit": "swimm verify" }}

Then, run the following in your terminal while in the repository root:

// run in terminal$ npx husky add .husky/pre-commit "npm run pre-commit"


Pre-commit works with Git to intercept certain kinds of events through the use of hooks, which allows actions to run before the commit transaction actually takes place. Swimm's CI tools are just as useful if run pre-commit as they are if run through a CI server - the main difference is the check runs on your local machine before the commit actually takes place, and not as a part of the push / PR / review cycle.

The result is the same, failed documentation checks can trigger other things to happen, or even block the commit, depending on the conventions that feel right for you and your team.

To install pre-commit hooks, first install pre-commit, and then follow the instructions in this repository.

Other CI / Build Servers / Test Servers#

If you'd like us to support another kind of system, please let us know! In most cases, we can have a usable integration ready in a week or less.

If you need to integrate Swimm into a custom system, or need to get something up and running on a system we don't yet support right away, here are some things to keep in mind:

Shellcode Example: Verifying Docs As Up-To-Date#

swimm verify Is the command to run in order to see if documentation is up to date. If not, it will tell you which modules need attention, and exit with a nonzero status.

If you need to run the test 'headless' on a build server, you can use the following command to pull in the latest client and have node.js (10.15.0+) execute it:

echo "Verifying documentation units"src=$(curl -s | grep 'browser_download_url.*swimm-cli' | cut -d '"' -f 4) wget -O swimm_cli $srcnode swimm_cli --version  node swimm_cli verify

Shellcode Example: Verify Overall Coverage#

swimm coverage Will scan whatever code Git knows about and compare that to the amount of documentation you've created. The result will be a score of 0 to 100. To get that number, try the following command:

swimm coverage | grep "/" | awk '{print $4}'

Expect a float (as in 0.00 or 89.73). If you need a whole number (0 - 100), run this instead:

swimm coverage | grep "/" | awk '{print $4}' | cut -d. -f1

Again, if you need to run headless on a build server that we don't currently have integration for, use the same method we used above for verify, except run coverage instead.

If you get stuck or just want to show us what you came up with, please reach out!