Closes#18908
This PR started as a cleanup of redundant logic for setting up envs when
Zed is launched as a desktop entry on Linux. More on this can be read
[here](https://github.com/zed-industries/zed/pull/22335#issuecomment-2574726377).
The TLDR is that desktop entries on Linux sometimes might not have the
correct envs (as they don't `cwd` into your project directory). To
address this, we initially tried to fix it by loading the default shell
and its env vars.
However, a better solution, as recommended by @mrnugget, is to pass
`env` as `None`. Internally, if `env` is `None`, it falls back to the
project's working dir envs. This removes the need to manually load the
envs and is cleaner.
Additionally, it also fixes an issue with Zed not loading
project-specific envs because now we are actually doing so (albeit
unintentionally?).
I don't have macOS to test, but I believe this is not an issue on macOS
since it uses the Zed binary instead of the CLI, which essentially sets
the CLI `env` to `None` automatically.
Before:
Here, I have `/home/tims/go/bin` set up in `.envrc`, which only loads in
that project directory.
When launching Zed via the CLI in the project directory, notice
`/home/tims/go/bin` is in the `PATH`. As a result, we use the
user-installed `gopls` server.
```sh
[INFO] attempting to start language server "gopls", path: "/home/tims/temp/go-proj", id: 1
[INFO] using project environment variables from CLI. PATH="/home/tims/go/bin:/usr/local/go/bin"
[INFO] found user-installed language server for gopls. path: "/home/tims/go/bin/gopls", arguments: ["-mode=stdio"]
[INFO] starting language server process. binary path: "/home/tims/go/bin/gopls", working directory: "/home/tims/temp/go-proj", args: ["-mode=stdio"]
```
However, when using the desktop entry and attempting to load envs from
the default shell, notice `/home/tims/go/bin` is no longer there since
it's not in the project directory. Zed cannot find the user-installed
language server and starts downloading its own `gopls`.
```sh
[INFO] attempting to start language server "gopls", path: "/home/tims/temp/go-proj", id: 1
[INFO] using project environment variables from CLI. PATH="/usr/local/go/bin"
[INFO] fetching latest version of language server "gopls"
[INFO] downloading language server "gopls"
[INFO] starting language server process. binary path: "/home/tims/.local/share/zed/languages/gopls/gopls_0.17.1_go_1.23.4", working directory: "/home/tims/temp/go-proj", args: ["-mode=stdio"]
```
After:
When using the desktop entry, we pass the CLI env as `None`. For the
language server, it falls back to the project directory envs. Result,
Zed finds the user-installed language server.
```sh
[INFO] attempting to start language server "gopls", path: "/home/tims/temp/go-proj", id: 1
[INFO] using project environment variables shell launched in "/home/tims/temp/go-proj". PATH="/home/tims/go/bin:/usr/local/go/bin"
[INFO] found user-installed language server for gopls. path: "/home/tims/go/bin/gopls", arguments: ["-mode=stdio"]
[INFO] starting language server process. binary path: "/home/tims/go/bin/gopls", working directory: "/home/tims/temp/go-proj", args: ["-mode=stdio"]
```
Release Notes:
- Fixed issue with project-specific env not being found via .envrc
(direnv) on Linux
632372a4f1