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Clean up documentation for tracked files

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Bryan Bennett 2022-06-21 09:11:56 -04:00
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52
README.md
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@ -113,7 +113,7 @@ In `/etc/nixos/configuration.nix`:
environment.pathsToLink = [
"/share/nix-direnv"
];
# if you also want support for flakes
# if you also want support for flakes
nixpkgs.overlays = [
(self: super: { nix-direnv = super.nix-direnv.override { enableFlakes = true; }; } )
];
@ -164,7 +164,7 @@ or `~/.config/direnv/direnvrc`:
source $HOME/nix-direnv/direnvrc
```
You also need to set `keep-outputs` and `keep-derivations` to nix.conf
You also need to set `keep-outputs` and `keep-derivations` to nix.conf
as described in the installation via home-manager section.
</details>
@ -208,7 +208,7 @@ The code is tested and does work but the upstream flake api is not finalized,
so we we cannot guarantee stability after an nix upgrade.
Like `use_nix`,
our `use_flake` will prevent garbage collection of downloaded packages,
our `use_flake` will prevent garbage collection of downloaded packages,
including flake inputs.
### Creating a new flake-native project
@ -264,7 +264,7 @@ Due to historical reasons, the argument parsing emulates `nix shell`.
This leads to some limitations in what we can reasonably parse.
Currently, all single-word arguments and some well-known double arguments
Currently, all single-word arguments and some well-known double arguments
will be interpeted or passed along.
##### Known arguments
@ -275,18 +275,48 @@ will be interpeted or passed along.
`--command`, `--run`, `--exclude`, `--pure`, `-i`, and `--keep` are explicitly ignored.
All single word arguments (`-j4`, `--impure` etc)
All single word arguments (`-j4`, `--impure` etc)
are passed to the underlying nix invocation.
##### Tracked files
#### Tracked files
`nix-direnv` makes a performance tradeoff only considers changes in a limited
number of files when deciding to update its cache.
`nix-direnv` makes a performance tradeoff
and only considers changes in a limited number of files
when deciding to update its cache.
- for `use nix` this is `~/.direnvrc`, `~/.config/direnv/direnvrc`, `.envrc`, `default.nix` and `shell.nix`
- for `use flake` this is `~/.direnvrc`, `~/.config/direnv/direnvrc`, `.envrc`, `flake.nix`, `flake.lock` and `devshell.toml`
- for `use nix` this is:
* `~/.direnvrc`
* `~/.config/direnv/direnvrc`
* `.envrc`,
* A single nix file. In order of preference:
+ The file argument to `use nix`
+ `default.nix` if it exists
+ `shell.nix` if it exists
To add more files to be checked use `nix_direnv_watch_file` like this: `nix_direnv_watch_file your-file.nix`
- for `use flake` this is:
* `~/.direnvrc`
* `~/.config/direnv/direnvrc`
* `.envrc`
* `flake.nix`
* `flake.lock`
* `devshell.toml` if it exists
To add more files to be checked use `nix_direnv_watch_file` like this
```shell
$ nix_direnv_watch_file your-file.nix
```
Or - if you don't mind the overhead (runtime and conceptual) of watching all nix-files:
```shell
nix_direnv_watch_file $(find . -name "*.nix" -printf '"%p" ')
```
Note that this will re-execute direnv for any nix change,
regardless of whether that change is meaningful for the devShell in use.
`nix_direnv_watch_file` must be invoked before either `use flake` or `use nix` to take effect.
## General direnv tips

2
direnvrc
View file

@ -303,7 +303,7 @@ use_nix() {
done
# nixfile may be empty,
# but nix_direnv_watch_file checks for existance before adding to watches
# but nix_direnv_watch_file checks for existence before adding to watches
nix_direnv_watch_file "$HOME/.direnvrc" "$HOME/.config/direnv/direnvrc" .envrc "$nixfile"
local need_update=0