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refactor: readme
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- use message from the default devShell

- fix headings

- write about new scripts
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deemp committed Jan 5, 2024
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94 changes: 51 additions & 43 deletions README.md
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# devshell - like virtualenv, but for all the languages.
# devshell - like virtualenv, but for all the languages

**STATUS: unstable**
<h3>STATUS: unstable</h3>

[![Devshell Dev Environment](https://img.shields.io/badge/nix-devshell-blue?logo=NixOS&labelColor=ccc)](https://github.com/numtide/devshell) [![Support room on Matrix](https://img.shields.io/matrix/devshell:numtide.com.svg?label=%23devshell%3Anumtide.com&logo=matrix&server_fqdn=matrix.numtide.com)](https://matrix.to/#/#devshell:numtide.com)

Expand Down Expand Up @@ -37,16 +37,20 @@ compiler.
This is why `mkShell` builds its environment from a `builtins.derivation`.

direnv loads will change from:
```

```sh
direnv: export +AR +AS +CC +CONFIG_SHELL +CXX +HOST_PATH +IN_NIX_SHELL +LD +NIX_BINTOOLS +NIX_BINTOOLS_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_BUILD_CORES +NIX_BUILD_TOP +NIX_CC +NIX_CC_WRAPPER_TARGET_HOST_x86_64_unknown_linux_gnu +NIX_CFLAGS_COMPILE +NIX_ENFORCE_NO_NATIVE +NIX_HARDENING_ENABLE +NIX_INDENT_MAKE +NIX_LDFLAGS +NIX_STORE +NM +OBJCOPY +OBJDUMP +RANLIB +READELF +RUSTC +SIZE +SOURCE_DATE_EPOCH +STRINGS +STRIP +TEMP +TEMPDIR +TMP +TMPDIR +buildInputs +buildPhase +builder +builtDependencies +cargo_bins_jq_filter +cargo_build_options +cargo_options +cargo_release +cargo_test_options +cargoconfig +checkPhase +configureFlags +configurePhase +cratePaths +crate_sources +depsBuildBuild +depsBuildBuildPropagated +depsBuildTarget +depsBuildTargetPropagated +depsHostHost +depsHostHostPropagated +depsTargetTarget +depsTargetTargetPropagated +doCheck +doInstallCheck +docPhase +dontAddDisableDepTrack +dontUseCmakeConfigure +installPhase +name +nativeBuildInputs +out +outputs +patches +preInstallPhases +propagatedBuildInputs +propagatedNativeBuildInputs +remapPathPrefix +shell +src +stdenv +strictDeps +system +version ~PATH
```

to:
```

```sh
direnv: export +DEVSHELL_DIR +PRJ_DATA_DIR +PRJ_ROOT +IN_NIX_SHELL +NIXPKGS_PATH ~PATH
```

There are new environment variables useful to support the day-to-day
activities:

* `DEVSHELL_DIR`: contains all the programs.
* `PRJ_ROOT`: points to the project root.
* `PRJ_DATA_DIR`: points to `$PRJ_ROOT/.data` by default. Is used to store runtime data.
Expand All @@ -57,8 +61,7 @@ activities:
The shell comes pre-loaded with some utility functions. I'm not 100% sure if
those are useful yet:

* `devshell-menu` - list all the programs available
* `devshell-root` - `cd` back to the project root.
* `menu` - list all the programs available

### MOTD

Expand All @@ -67,15 +70,27 @@ commands are available.

When running `nix-shell` or `nix develop`, `mkShell` prints a welcome message:

```
```sh
🔨 Welcome to devshell

# Commands
[[general commands]]

hello - prints hello
menu - prints this menu

[formatters]

nixpkgs-fmt - Nix code formatter for nixpkgs

[linters]

golangci-lint - golang linter

[utilites]

devshell-menu - print this menu
devshell-root - change directory to root
hello - prints hello
nixpkgs-fmt - used to format Nix code
hub - github utility

[devshell]$
```

### Configurable with a TOML file
Expand Down Expand Up @@ -113,7 +128,6 @@ nix run '.#<myapp>' -- <devshell-command> <and-args>

This project itself exposes a Nix application; you can try it out with:


```sh
nix run 'github:numtide/devshell' -- hello
```
Expand All @@ -124,41 +138,35 @@ See [here](docs/flake-app.md) for how to export your devshell as a flake app.

A lot of things!

### Documentation

Explain how all of this works and all the use-cases.

### Testing

Write integration tests for all of the use-cases.

### Lazy dependencies

This requires some coordination with the repository structure. To keep the
dev closure small, it would be nice to be able to load some of the
dependencies on demand.

### Doctor / nix version check

Not everything can be nicely sandboxed. Is it possible to get a fast doctor
script that checks that everything is in good shape?

### Support other shells

What? Not everyone is using bash? Right now, support is already available in
direnv mode.

# Contributing

## Dev Setup
* **Documentation**
* Explain how all of this works and all the use-cases.
* **Testing**
* Write integration tests for all of the use-cases.
* **Lazy dependencies**
* This requires some coordination with the repository structure. To keep the
dev closure small, it would be nice to be able to load some of the
dependencies on demand.
* **Doctor / nix version check**
* Not everything can be nicely sandboxed. Is it possible to get a fast doctor
script that checks that everything is in good shape?
* **Support other shells**
* What? Not everyone is using bash? Right now, support is already available in
direnv mode.

## Contributing

### Docs

1. Change files in `docs/`
2. Run `docs/serve.sh` (or the task in VSCode)
3. Visit [`localhost:8000`](http://localhost:8000)
1. Run `nix run .#docs`
1. Open [`docs`](http://localhost:3000/index.html)

### Benchmark

1. See [benchmark/README.md](./benchmark/README.md)
1. Run `nix run .#bench`

# Commercial support
## Commercial support

Looking for help or customization?

Expand Down

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