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Update documentation to showcase argument passing

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Bryan Bennett 2021-12-22 08:11:31 -05:00
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README.md
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@ -189,6 +189,24 @@ you can specify an arbitrary flake expression as parameter such as:
use flake ~/myflakes#project
```
### Advanced usage
Under the covers, `use_flake` calls `nix print-dev-env`.
The first argument to the `use_flake` function is the flake expression to use,
and all other arguments are proxied along to the call to `print-dev-env`.
You may make use of this fact for some more arcane invocations.
For instance, if you have a flake that needs to be called impurely under some conditions,
you may wish to pass `--impure` to the `print-dev-env` invocation
so that the environment of the calling shell is passed in.
You can do that as follows:
```
$ echo "use flake . --impure" > .envrc
$ direnv allow
```
## Storing .direnv outside the project directory
A `.direnv` directory will be created in each `use_nix` project, which might