fix: assign to functions hash to make %x work

[psprint]

The useful %x prompt expansion can be used to get path to the executed script: 0=${(%):-%x}

Description

It is always the correct, expected value, even for autoloaded functions. However, it currently doesn't work with Zinit special fpath-pollution free autoload. This patch fixes this.

Motivation and Context

It is comfortable to get correct $0 even for autoloaded functions with:

0=${(%):-%x}

However to make it fully work under Zinit, it has to define its emulated autoload function with:

functions[func]="…"

instead of:

eval "function func { …"

because the eval method returns wrong path at first function execution (returns path to name.plugin.zsh instead). That's the change of this PR.

How Has This Been Tested?

The change has to work, it's very isolated.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[vladdoster]

I can't quite tell what this fixes. Could you share a screenshot?

[vladdoster]

I thought it would fix the following issue at a cursory glance, but I guessed wrong.

[psprint]

Here is the screenshot:

[vladdoster]

@psprint,

I'm still unclear on what this fixes. Does it improve a certain ice, command, or just zsh programming in general?

[psprint]

It allows to use better $0 retriever code than the currently recommended in plugin standard. So maybe yes it improves zsh programming in general. I'll be writing a patch to the standard if the zinit problem will be fixed.

[psprint]

Could the PR be merged? It`s a very local, isolated change, basically a bug fix. To provide more info on what it does:

• the %x is a prompt expansion, which is used in a ${(%)…} expansion that enables the expansion outside the prompt,
• so basically, %x would expand only in $PROMPT/$PS/etc. vars when printing prompt, while with (%) it expands in the place of use,
• %x is a useful expansion, it returns path to the currently executed script or function,
• so it is very useful to set $0 to the plg.plugin.zsh file, or even to any executed function,
• however, the special autoload of Zinit is currently broken when first used the autoloaded func, when the function is loaded before first execution,
• the PR fixes this, making %x return the path to the function correctly, even at first call.

Is everything clear? I'm holding back because %x isn't fixed in Zinit, before updating the plugin standard, it's 0=… recommendation there.

[psprint]

Thanks for merging. Could some other my PRs be merged? Like those mentioned in #448 ?