1Password Environments and similar secret managers mount `.env` files
as UNIX named pipes (FIFOs) instead of regular files. The `source_env`
function previously only checked for regular files (`-f`), causing it
to silently skip FIFO-backed `.env` files. Adding a `-p` check allows
the plugin to also source named pipes.
* dotenv: add possibility to agree once for a given .env file
* refactor: fix code style
* Use :A modifier instead of readlink. Thanks Aloxaf
* Use grep and clean up allowed list check logic
* Simplify and reorder file; change default allowed list path
* Add new feature to README
* Make sure ZSH_CACHE_DIR is defined
* Resolve symlinks in $PWD before storing in allowed list
Co-authored-by: Aloxaf <bailong104@gmail.com>
Co-authored-by: Marc Cornellà <marc.cornella@live.com>
