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Lay some groundwork for language plugins (#3837)

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This PR adds undocumented functionality for loading custom language
plugins at runtime. I don't intend to expose the functionality to end
users yet, but this will allow the team to test the capability
internally.

### Implementation

There isn't much new code in Zed. Most of the work here is within
Tree-sitter, in PRs https://github.com/tree-sitter/tree-sitter/pull/1864
and https://github.com/tree-sitter/tree-sitter/pull/2840, which allow
Tree-sitter to load languages from WASM blobs. I've tested the
functionality in Tree-sitter's test suite and via its CLI, but having it
wired into Zed allows us to test the functionality more fully.

### Details

Now, on startup, Zed will look for subdirectories inside of
`~/Application Support/plugins`. These subdirectories are expected to
look similar to the per-language subdirectories in
[`crates/zed2/src/languages`](https://github.com/zed-industries/zed/tree/main/crates/zed2/src/languages),
except that they also contain a `.wasm` file for the parser itself.

I'll add more details here as I go.
This commit is contained in:
Max Brunsfeld 2024-01-03 09:37:42 -08:00 • committed by GitHub
commit b594e59134
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12 changed files with 518 additions and 95 deletions
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crates/util/src/paths.rs
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@ -10,6 +10,7 @@ lazy_static::lazy_static! {
pub static ref EMBEDDINGS_DIR: PathBuf = HOME.join(".config/zed/embeddings");
pub static ref LOGS_DIR: PathBuf = HOME.join("Library/Logs/Zed");
pub static ref SUPPORT_DIR: PathBuf = HOME.join("Library/Application Support/Zed");
pub static ref PLUGINS_DIR: PathBuf = HOME.join("Library/Application Support/Zed/plugins");
pub static ref LANGUAGES_DIR: PathBuf = HOME.join("Library/Application Support/Zed/languages");
pub static ref COPILOT_DIR: PathBuf = HOME.join("Library/Application Support/Zed/copilot");
pub static ref DEFAULT_PRETTIER_DIR: PathBuf = HOME.join("Library/Application Support/Zed/prettier");