Environment issue with $XDG_DATA_HOME/firenvim/firenvim

[ppom0]

Hi!
I have an issue setting up Firenvim on NixOS.
After some help on its forum, I have set XDG_DATA_HOME correctly.
But it appears that :

• This command works fine (no output) : echo 'abcde{}' | eval < .local/share/firenvim/firenvim
• This command doesn't : echo 'abcde{}' | .local/share/firenvim/firenvim
  Here's the relevant error :

E117: Unknown function: firenvim#run

I don't understand the difference between them. I think it's an environment issue.
Thanks for help!

• OS Version: linux x86-64
• Browser Version: Firefox 85.0
• Browser Addon Version: 0.2.4
• Neovim Plugin Version:

[glacambre]

Thanks for going through the troubleshooting steps, this is very useful. This error indicates that the Firenvim bash script was able to run Neovim but that Firenvim does not exist in Neovim's runtime path (= the neovim plugin isn't loaded).

The simplest way to fix this is to edit .local/share/firenvim/firenvim and add --cmd 'set rtp+=PATH/TO/GIT/CHECKOUT/OF/FIRENVIM' to the line that execs neovim, in order to force loading of the plugin. I'm surprised this is not working by default though - how did you install the neovim plugin?

[ppom0]

It indeed fixed the issue, many thanks!
My installation is standard (I think), I install plugins with vim-plug, the plugins are here ~/.config/nvim/plugged and the init script is here ~/.config/nvim/init.vim