chore: Extract languages from zed crate (#8270)

- Moves languages module from `zed` into a separate crate. That way we
have less of a long pole at the end of compilation.
- Removes moot dependencies on editor/picker. This is totally harmless
and might help in the future if we decide to decouple picker from
editor.

Before:
```
Number of crates that depend on 'picker' but not on 'editor': 1
Total number of crates that depend on 'picker': 13
Total number of crates that depend on 'editor': 30
```
After:
```
Number of crates that depend on 'picker' but not on 'editor': 5
Total number of crates that depend on 'picker': 12
Total number of crates that depend on 'editor': 26
```
The more crates depend on just picker but not editor, the better in that
case.

Release Notes:

- N/A

crates/languages/src/deno.rs

@@ -0,0 +1,236 @@
+use anyhow::{anyhow, bail, Context, Result};
+use async_trait::async_trait;
+use collections::HashMap;
+use futures::StreamExt;
+use language::{LanguageServerName, LspAdapter, LspAdapterDelegate};
+use lsp::{CodeActionKind, LanguageServerBinary};
+use schemars::JsonSchema;
+use serde_derive::{Deserialize, Serialize};
+use serde_json::json;
+use settings::Settings;
+use smol::{fs, fs::File};
+use std::{any::Any, env::consts, ffi::OsString, path::PathBuf, sync::Arc};
+use util::{
+    async_maybe,
+    fs::remove_matching,
+    github::{latest_github_release, GitHubLspBinaryVersion},
+    ResultExt,
+};
+
+#[derive(Clone, Serialize, Deserialize, JsonSchema)]
+pub struct DenoSettings {
+    pub enable: bool,
+}
+
+#[derive(Clone, Serialize, Default, Deserialize, JsonSchema)]
+pub struct DenoSettingsContent {
+    enable: Option<bool>,
+}
+
+impl Settings for DenoSettings {
+    const KEY: Option<&'static str> = Some("deno");
+
+    type FileContent = DenoSettingsContent;
+
+    fn load(
+        default_value: &Self::FileContent,
+        user_values: &[&Self::FileContent],
+        _: &mut gpui::AppContext,
+    ) -> Result<Self>
+    where
+        Self: Sized,
+    {
+        Self::load_via_json_merge(default_value, user_values)
+    }
+}
+
+fn deno_server_binary_arguments() -> Vec<OsString> {
+    vec!["lsp".into()]
+}
+
+pub struct DenoLspAdapter {}
+
+impl DenoLspAdapter {
+    pub fn new() -> Self {
+        DenoLspAdapter {}
+    }
+}
+
+#[async_trait]
+impl LspAdapter for DenoLspAdapter {
+    fn name(&self) -> LanguageServerName {
+        LanguageServerName("deno-language-server".into())
+    }
+
+    fn short_name(&self) -> &'static str {
+        "deno-ts"
+    }
+
+    async fn fetch_latest_server_version(
+        &self,
+        delegate: &dyn LspAdapterDelegate,
+    ) -> Result<Box<dyn 'static + Send + Any>> {
+        let release =
+            latest_github_release("denoland/deno", true, false, delegate.http_client()).await?;
+        let os = match consts::OS {
+            "macos" => "apple-darwin",
+            "linux" => "unknown-linux-gnu",
+            "windows" => "pc-windows-msvc",
+            other => bail!("Running on unsupported os: {other}"),
+        };
+        let asset_name = format!("deno-{}-{os}.zip", consts::ARCH);
+        let asset = release
+            .assets
+            .iter()
+            .find(|asset| asset.name == asset_name)
+            .ok_or_else(|| anyhow!("no asset found matching {:?}", asset_name))?;
+        let version = GitHubLspBinaryVersion {
+            name: release.tag_name,
+            url: asset.browser_download_url.clone(),
+        };
+        Ok(Box::new(version) as Box<_>)
+    }
+
+    async fn fetch_server_binary(
+        &self,
+        version: Box<dyn 'static + Send + Any>,
+        container_dir: PathBuf,
+        delegate: &dyn LspAdapterDelegate,
+    ) -> Result<LanguageServerBinary> {
+        let version = version.downcast::<GitHubLspBinaryVersion>().unwrap();
+        let zip_path = container_dir.join(format!("deno_{}.zip", version.name));
+        let version_dir = container_dir.join(format!("deno_{}", version.name));
+        let binary_path = version_dir.join("deno");
+
+        if fs::metadata(&binary_path).await.is_err() {
+            let mut response = delegate
+                .http_client()
+                .get(&version.url, Default::default(), true)
+                .await
+                .context("error downloading release")?;
+            let mut file = File::create(&zip_path).await?;
+            if !response.status().is_success() {
+                Err(anyhow!(
+                    "download failed with status {}",
+                    response.status().to_string()
+                ))?;
+            }
+            futures::io::copy(response.body_mut(), &mut file).await?;
+
+            let unzip_status = smol::process::Command::new("unzip")
+                .current_dir(&container_dir)
+                .arg(&zip_path)
+                .arg("-d")
+                .arg(&version_dir)
+                .output()
+                .await?
+                .status;
+            if !unzip_status.success() {
+                Err(anyhow!("failed to unzip deno archive"))?;
+            }
+
+            remove_matching(&container_dir, |entry| entry != version_dir).await;
+        }
+
+        Ok(LanguageServerBinary {
+            path: binary_path,
+            env: None,
+            arguments: deno_server_binary_arguments(),
+        })
+    }
+
+    async fn cached_server_binary(
+        &self,
+        container_dir: PathBuf,
+        _: &dyn LspAdapterDelegate,
+    ) -> Option<LanguageServerBinary> {
+        get_cached_server_binary(container_dir).await
+    }
+
+    async fn installation_test_binary(
+        &self,
+        container_dir: PathBuf,
+    ) -> Option<LanguageServerBinary> {
+        get_cached_server_binary(container_dir).await
+    }
+
+    fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
+        Some(vec![
+            CodeActionKind::QUICKFIX,
+            CodeActionKind::REFACTOR,
+            CodeActionKind::REFACTOR_EXTRACT,
+            CodeActionKind::SOURCE,
+        ])
+    }
+
+    async fn label_for_completion(
+        &self,
+        item: &lsp::CompletionItem,
+        language: &Arc<language::Language>,
+    ) -> Option<language::CodeLabel> {
+        use lsp::CompletionItemKind as Kind;
+        let len = item.label.len();
+        let grammar = language.grammar()?;
+        let highlight_id = match item.kind? {
+            Kind::CLASS | Kind::INTERFACE => grammar.highlight_id_for_name("type"),
+            Kind::CONSTRUCTOR => grammar.highlight_id_for_name("type"),
+            Kind::CONSTANT => grammar.highlight_id_for_name("constant"),
+            Kind::FUNCTION | Kind::METHOD => grammar.highlight_id_for_name("function"),
+            Kind::PROPERTY | Kind::FIELD => grammar.highlight_id_for_name("property"),
+            _ => None,
+        }?;
+
+        let text = match &item.detail {
+            Some(detail) => format!("{} {}", item.label, detail),
+            None => item.label.clone(),
+        };
+
+        Some(language::CodeLabel {
+            text,
+            runs: vec![(0..len, highlight_id)],
+            filter_range: 0..len,
+        })
+    }
+
+    fn initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true,
+        }))
+    }
+
+    fn language_ids(&self) -> HashMap<String, String> {
+        HashMap::from_iter([
+            ("TypeScript".into(), "typescript".into()),
+            ("JavaScript".into(), "javascript".into()),
+            ("TSX".into(), "typescriptreact".into()),
+        ])
+    }
+}
+
+async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {
+    async_maybe!({
+        let mut last = None;
+        let mut entries = fs::read_dir(&container_dir).await?;
+        while let Some(entry) = entries.next().await {
+            last = Some(entry?.path());
+        }
+
+        match last {
+            Some(path) if path.is_dir() => {
+                let binary = path.join("deno");
+                if fs::metadata(&binary).await.is_ok() {
+                    return Ok(LanguageServerBinary {
+                        path: binary,
+                        env: None,
+                        arguments: deno_server_binary_arguments(),
+                    });
+                }
+            }
+            _ => {}
+        }
+
+        Err(anyhow!("no cached binary"))
+    })
+    .await
+    .log_err()
+}