Fix Fish shell auto-switching on new tab/shell startup

[Mado13]

Problem

When opening a new Fish shell tab in the same directory (e.g., in WezTerm or other terminal emulators), the Ruby version was not automatically set based on .ruby-version. Users had to cd out and back into the directory to trigger the version switch.

Root Cause

The Fish shell init script only defined a --on-variable PWD hook, which triggers when the working directory changes. However, when a new shell starts in a directory, $PWD is set but never "changes", so the hook never fires.

Solution

Call _rv_autoload_hook immediately after defining it, matching the behavior already implemented for Zsh and Bash shells. This ensures the Ruby version is activated on shell startup, not just on directory changes.

Changes

• Modified crates/rv/src/commands/shell/init.rs to call _rv_autoload_hook after function definition in Fish shell
• All existing tests pass

Testing

Before:

$ rv shell init fish
function _rv_autoload_hook --on-variable PWD --description 'Change Ruby version on directory change using rv'
    status --is-command-substitution; and return
    /opt/homebrew/bin/rv shell env fish | source
end

After:

$ rv shell init fish
function _rv_autoload_hook --on-variable PWD --description 'Change Ruby version on directory change using rv'
    status --is-command-substitution; and return
    /opt/homebrew/bin/rv shell env fish | source
end
_rv_autoload_hook

Verified that opening new tabs in the same directory now correctly activates the Ruby version specified in .ruby-version.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[indirect]

Nice, thanks!