Question 1

How can I check for a specific version of a tool using has?

Accepted Answer

has does not support version constraints natively—it only reports the installed version. You'd need to parse its output and compare versions manually in a script, or use a more advanced tool like asdf for version management.

Question 2

Does has work on Windows?

Accepted Answer

has is a bash script, so it requires a Unix-like environment. On Windows, you can use it with WSL, Git Bash, or similar shells, but it won't run natively in Command Prompt or PowerShell without additional setup.

Question 3

has vs which command: which is better for checking tool availability?

Accepted Answer

which only checks if a command exists on PATH without version info, while has adds version reporting and exit codes for scripting. Use which for quick checks, but has is better for pre-flight validation in automated workflows.

Question 4

How to use has in a Dockerfile to verify dependencies?

Accepted Answer

You can run has directly in a Dockerfile using curl, e.g., `RUN curl -sL https://git.io/_has | bash -s node npm`, but ensure bash is installed in the base image and tools are on PATH during the build stage.

Question 5

Can has detect tools installed in virtual environments or conda?

Accepted Answer

has checks the system PATH, so if the virtual environment is activated and tools are added to PATH, it will detect them. Otherwise, you might need to adjust PATH variables or use unsafe mode for custom locations.

Question 6

How to add support for a new tool in has for version detection?

Accepted Answer

Version detection relies on a built-in whitelist in the source code. To add a new tool, you need to modify the script and contribute back via the project's CONTRIBUTING.md, as there's no user-configurable whitelist.

has

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