A more correct title would be “task vs just”, but it will look confusing for the search engines. I did not find a comparison post on anywhere, so here we are. In this post, I will tell my experiences and evaluations on them.

TL; DR

  • Scripting arguments: just
  • “Subfile” and working directory: task
  • Autocompletions: just

Scripting arguments

task and just both advertise themselves as make’s alternative that dedicate to task-running. Apart from the obvious different file format, I could hardly find any differences at first, but after testing both for a while, I think the most important question is: do you expect to use arguments within your scripts?

If the answer is yes, stick with just.

Let us see a “real-life” justfile by me:

create-new-script FOLDER NAME:
    mkdir -p {{FOLDER}}
    echo "#!/bin/bash" > {{FOLDER}}/{{NAME}}.sh
    chmod +x {{FOLDER}}/{{NAME}}.sh

And the command:

just create-new-script asdf install-nodejs

Compare it to a fictional equivalent Taskfile.yml:

version: '3'
tasks:
  create-new-script:
    cmds:
      - mkdir -p {{.FOLDER}}
      - echo "#!/bin/bash" > {{.FOLDER}}/{{.NAME}}.sh
      - chmod +x {{.FOLDER}}/{{.NAME}}.sh

And the command:

task create-new-script FOLDER=asdf NAME=install-nodejs

“Child” task/justfile and different working directory

I group the two use cases into one, since the file format can show them both. task obviously handles the two cases better than just.

Let us consider another “real-life” Taskfile by me:

version: '3'
includes:
  frontend:
    dir: ./frontend-angular-workspace
    taskfile: ./frontend-angular-workspace/Taskfile.yml
  backend:
    dir: ./backend-golang
    taskfile: ./backend-golang/Taskfile.yml
----
# frontend-angular-workspace/Taskfile.yml
version: '3'
tasks:
  build-core:
    cmds:
      - ng build
        --project amber-core

We can invoke the other Taskfile like this:

task frontend:build-core

Let us see a “fictional” equivalent Justfile:

frontend-build-core:
    cd frontend-angular-workspace && ng build --project amber-core

# an alternative version
frontend-build-core-alt:
    #!/bin/bash
    cd frontend-angular-workspace
    ng build --project amber-core

The command would be:

just frontend-build-core
# just frontend-build-core-alt

Autocompletions

just is a tad better since the --completions is built-in. task needs a little hack elsewhere, and it is not even complete.

The way to use just --completions is not so obvious in zsh, however. We need to add it to fpath, and execute compinit later.

# just --completions zsh > /tmp/_just
fpath += /tmp
compinit

Conclusion

It all boils down to your preference, as the lackluster functionalities of each are not a real deal breaker when you are used to them. Even though I am using just for my tasks nowadays, I do think that task’s Taskfile is slightly better than Justfile. It may also comes to your programming language liking (task’s Golang, versus just’s Rust).