WIP

crates/zed/src/languages/c.rs

@@ -0,0 +1,136 @@
+use anyhow::{anyhow, Result};
+use client::http::{self, HttpClient, Method};
+use futures::{future::BoxFuture, FutureExt, StreamExt};
+pub use language::*;
+use smol::fs::{self, File};
+use std::{path::PathBuf, str, sync::Arc};
+use util::{ResultExt, TryFutureExt};
+
+use super::GithubRelease;
+
+pub struct CLspAdapter;
+
+impl super::LspAdapter for CLspAdapter {
+    fn name(&self) -> &'static str {
+        "clangd"
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        http: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<LspBinaryVersion>> {
+        async move {
+            let release = http
+                .send(
+                    surf::RequestBuilder::new(
+                        Method::Get,
+                        http::Url::parse(
+                            "https://api.github.com/repos/clangd/clangd/releases/latest",
+                        )
+                        .unwrap(),
+                    )
+                    .middleware(surf::middleware::Redirect::default())
+                    .build(),
+                )
+                .await
+                .map_err(|err| anyhow!("error fetching latest release: {}", err))?
+                .body_json::<GithubRelease>()
+                .await
+                .map_err(|err| anyhow!("error parsing latest release: {}", err))?;
+            let asset_name = format!("clangd-mac-{}.zip", release.name);
+            let asset = release
+                .assets
+                .iter()
+                .find(|asset| asset.name == asset_name)
+                .ok_or_else(|| anyhow!("no release found matching {:?}", asset_name))?;
+            Ok(LspBinaryVersion {
+                name: release.name,
+                url: Some(asset.browser_download_url.clone()),
+            })
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: LspBinaryVersion,
+        http: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        async move {
+            let zip_path = container_dir.join(format!("clangd_{}.zip", version.name));
+            let version_dir = container_dir.join(format!("clangd_{}", version.name));
+            let binary_path = version_dir.join("bin/clangd");
+
+            if fs::metadata(&binary_path).await.is_err() {
+                let response = http
+                    .send(
+                        surf::RequestBuilder::new(Method::Get, version.url.unwrap())
+                            .middleware(surf::middleware::Redirect::default())
+                            .build(),
+                    )
+                    .await
+                    .map_err(|err| anyhow!("error downloading release: {}", err))?;
+                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, &mut file).await?;
+
+                let unzip_status = smol::process::Command::new("unzip")
+                    .current_dir(&container_dir)
+                    .arg(&zip_path)
+                    .output()
+                    .await?
+                    .status;
+                if !unzip_status.success() {
+                    Err(anyhow!("failed to unzip clangd archive"))?;
+                }
+
+                if let Some(mut entries) = fs::read_dir(&container_dir).await.log_err() {
+                    while let Some(entry) = entries.next().await {
+                        if let Some(entry) = entry.log_err() {
+                            let entry_path = entry.path();
+                            if entry_path.as_path() != version_dir {
+                                fs::remove_dir_all(&entry_path).await.log_err();
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(binary_path)
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+        async move {
+            let mut last_clangd_dir = None;
+            let mut entries = fs::read_dir(&container_dir).await?;
+            while let Some(entry) = entries.next().await {
+                let entry = entry?;
+                if entry.file_type().await?.is_dir() {
+                    last_clangd_dir = Some(entry.path());
+                }
+            }
+            let clangd_dir = last_clangd_dir.ok_or_else(|| anyhow!("no cached binary"))?;
+            let clangd_bin = clangd_dir.join("bin/clangd");
+            if clangd_bin.exists() {
+                Ok(clangd_bin)
+            } else {
+                Err(anyhow!(
+                    "missing clangd binary in directory {:?}",
+                    clangd_dir
+                ))
+            }
+        }
+        .log_err()
+        .boxed()
+    }
+
+    fn process_diagnostics(&self, _: &mut lsp::PublishDiagnosticsParams) {}
+}

crates/zed/src/languages/c/brackets.scm

@@ -0,0 +1,3 @@
+("[" @open "]" @close)
+("{" @open "}" @close)
+("\"" @open "\"" @close)

crates/zed/src/languages/c/config.toml

@@ -0,0 +1,11 @@
+name = "C"
+path_suffixes = ["c", "h"]
+line_comment = "// "
+autoclose_before = ";:.,=}])>"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false },
+    { start = "/*", end = " */", close = true, newline = false },
+]

crates/zed/src/languages/c/highlights.scm

@@ -0,0 +1,101 @@
+[
+  "break"
+  "case"
+  "const"
+  "continue"
+  "default"
+  "do"
+  "else"
+  "enum"
+  "extern"
+  "for"
+  "if"
+  "inline"
+  "return"
+  "sizeof"
+  "static"
+  "struct"
+  "switch"
+  "typedef"
+  "union"
+  "volatile"
+  "while"
+] @keyword
+
+[
+  "#define"
+  "#elif"
+  "#else"
+  "#endif"
+  "#if"
+  "#ifdef"
+  "#ifndef"
+  "#include"
+  (preproc_directive)
+] @keyword
+
+[
+  "--"
+  "-"
+  "-="
+  "->"
+  "="
+  "!="
+  "*"
+  "&"
+  "&&"
+  "+"
+  "++"
+  "+="
+  "<"
+  "=="
+  ">"
+  "||"
+] @operator
+
+[
+  "."
+  ";"
+] @delimiter
+
+[
+  (string_literal)
+  (system_lib_string)
+  (char_literal)
+] @string
+
+(comment) @comment
+
+(null) @constant
+(number_literal) @number
+
+[
+  (true)
+  (false)
+  (null)
+] @constant
+
+(identifier) @variable
+
+((identifier) @constant
+ (#match? @constant "^[A-Z][A-Z\\d_]*$"))
+
+(call_expression
+  function: (identifier) @function)
+(call_expression
+  function: (field_expression
+    field: (field_identifier) @function))
+(function_declarator
+  declarator: (identifier) @function)
+(preproc_function_def
+  name: (identifier) @function.special)
+
+(field_identifier) @property
+(statement_identifier) @label
+
+[
+  (type_identifier)
+  (primitive_type)
+  (sized_type_specifier)
+] @type
+

crates/zed/src/languages/c/indents.scm

@@ -0,0 +1,7 @@
+[
+    (field_expression)
+    (assignment_expression)
+] @indent
+
+(_ "{" "}" @end) @indent
+(_ "(" ")" @end) @indent

crates/zed/src/languages/c/outline.scm

@@ -0,0 +1,30 @@
+(preproc_def
+    "#define" @context
+    name: (_) @name) @item
+
+(preproc_function_def
+    "#define" @context
+    name: (_) @name
+    parameters: (preproc_params
+        "(" @context
+        ")" @context)) @item
+
+(type_definition
+    "typedef" @context
+    declarator: (_) @name) @item
+
+(declaration
+    type: (_) @context
+    declarator: (function_declarator
+        declarator: (_) @name
+        parameters: (parameter_list
+            "(" @context
+            ")" @context))) @item
+
+(function_definition
+    type: (_) @context
+    declarator: (function_declarator
+        declarator: (_) @name
+        parameters: (parameter_list
+            "(" @context
+            ")" @context))) @item

crates/zed/src/languages/json.rs

@@ -0,0 +1,131 @@
+use anyhow::{anyhow, Context, Result};
+use client::http::HttpClient;
+use futures::{future::BoxFuture, FutureExt, StreamExt};
+use language::{LspAdapter, LspBinaryVersion};
+use serde::Deserialize;
+use serde_json::json;
+use smol::fs;
+use std::{path::PathBuf, sync::Arc};
+use util::ResultExt;
+
+pub struct JsonLspAdapter;
+
+impl JsonLspAdapter {
+    const BIN_PATH: &'static str =
+        "node_modules/vscode-json-languageserver/bin/vscode-json-languageserver";
+}
+
+impl LspAdapter for JsonLspAdapter {
+    fn name(&self) -> &'static str {
+        "vscode-json-languageserver"
+    }
+
+    fn server_args(&self) -> &[&str] {
+        &["--stdio"]
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        _: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<LspBinaryVersion>> {
+        async move {
+            #[derive(Deserialize)]
+            struct NpmInfo {
+                versions: Vec<String>,
+            }
+
+            let output = smol::process::Command::new("npm")
+                .args(["info", "vscode-json-languageserver", "--json"])
+                .output()
+                .await?;
+            if !output.status.success() {
+                Err(anyhow!("failed to execute npm info"))?;
+            }
+            let mut info: NpmInfo = serde_json::from_slice(&output.stdout)?;
+
+            Ok(LspBinaryVersion {
+                name: info
+                    .versions
+                    .pop()
+                    .ok_or_else(|| anyhow!("no versions found in npm info"))?,
+                url: Default::default(),
+            })
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: LspBinaryVersion,
+        _: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        async move {
+            let version_dir = container_dir.join(&version.name);
+            fs::create_dir_all(&version_dir)
+                .await
+                .context("failed to create version directory")?;
+            let binary_path = version_dir.join(Self::BIN_PATH);
+
+            if fs::metadata(&binary_path).await.is_err() {
+                let output = smol::process::Command::new("npm")
+                    .current_dir(&version_dir)
+                    .arg("install")
+                    .arg(format!("vscode-json-languageserver@{}", version.name))
+                    .output()
+                    .await
+                    .context("failed to run npm install")?;
+                if !output.status.success() {
+                    Err(anyhow!("failed to install vscode-json-languageserver"))?;
+                }
+
+                if let Some(mut entries) = fs::read_dir(&container_dir).await.log_err() {
+                    while let Some(entry) = entries.next().await {
+                        if let Some(entry) = entry.log_err() {
+                            let entry_path = entry.path();
+                            if entry_path.as_path() != version_dir {
+                                fs::remove_dir_all(&entry_path).await.log_err();
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(binary_path)
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+        async move {
+            let mut last_version_dir = None;
+            let mut entries = fs::read_dir(&container_dir).await?;
+            while let Some(entry) = entries.next().await {
+                let entry = entry?;
+                if entry.file_type().await?.is_dir() {
+                    last_version_dir = Some(entry.path());
+                }
+            }
+            let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
+            let bin_path = last_version_dir.join(Self::BIN_PATH);
+            if bin_path.exists() {
+                Ok(bin_path)
+            } else {
+                Err(anyhow!(
+                    "missing executable in directory {:?}",
+                    last_version_dir
+                ))
+            }
+        }
+        .log_err()
+        .boxed()
+    }
+
+    fn process_diagnostics(&self, _: &mut lsp::PublishDiagnosticsParams) {}
+
+    fn initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true
+        }))
+    }
+}

crates/zed/src/languages/json/brackets.scm

@@ -0,0 +1,3 @@
+("[" @open "]" @close)
+("{" @open "}" @close)
+("\"" @open "\"" @close)

crates/zed/src/languages/json/config.toml

@@ -0,0 +1,8 @@
+name = "JSON"
+path_suffixes = ["json"]
+autoclose_before = ",]}"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false },
+]

crates/zed/src/languages/json/highlights.scm

@@ -0,0 +1,12 @@
+(string) @string
+
+(pair
+  key: (string) @property)
+
+(number) @number
+
+[
+  (true)
+  (false)
+  (null)
+] @constant

crates/zed/src/languages/json/indents.scm

@@ -0,0 +1,2 @@
+(array "]" @end) @indent
+(object "}" @end) @indent

crates/zed/src/languages/json/outline.scm

@@ -0,0 +1,2 @@
+(pair
+  key: (string (string_content) @name)) @item

crates/zed/src/languages/markdown/config.toml

@@ -0,0 +1,8 @@
+name = "Markdown"
+path_suffixes = ["md"]
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "<", end = ">", close = true, newline = true },
+]

crates/zed/src/languages/markdown/highlights.scm

@@ -0,0 +1,24 @@
+(emphasis) @emphasis
+(strong_emphasis) @emphasis.strong
+
+[
+  (atx_heading)
+  (setext_heading)
+] @title
+
+[
+  (list_marker_plus)
+  (list_marker_minus)
+  (list_marker_star)
+  (list_marker_dot)
+  (list_marker_parenthesis)
+] @list_marker
+
+[
+  (indented_code_block)
+  (fenced_code_block)
+  (code_span)
+] @text.literal
+
+(link_destination) @link_uri
+(link_text) @link_text

crates/zed/src/languages/rust.rs

@@ -0,0 +1,436 @@
+use anyhow::{anyhow, Result};
+use async_compression::futures::bufread::GzipDecoder;
+use client::http::{self, HttpClient, Method};
+use futures::{future::BoxFuture, FutureExt, StreamExt};
+pub use language::*;
+use lazy_static::lazy_static;
+use regex::Regex;
+use smol::fs::{self, File};
+use std::{borrow::Cow, env::consts, path::PathBuf, str, sync::Arc};
+use util::{ResultExt, TryFutureExt};
+
+use super::GithubRelease;
+
+pub struct RustLspAdapter;
+
+impl LspAdapter for RustLspAdapter {
+    fn name(&self) -> &'static str {
+        "rust-analyzer"
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        http: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<LspBinaryVersion>> {
+        async move {
+            let release = http
+            .send(
+                surf::RequestBuilder::new(
+                    Method::Get,
+                    http::Url::parse(
+                        "https://api.github.com/repos/rust-analyzer/rust-analyzer/releases/latest",
+                    )
+                    .unwrap(),
+                )
+                .middleware(surf::middleware::Redirect::default())
+                .build(),
+            )
+            .await
+            .map_err(|err| anyhow!("error fetching latest release: {}", err))?
+            .body_json::<GithubRelease>()
+            .await
+            .map_err(|err| anyhow!("error parsing latest release: {}", err))?;
+            let asset_name = format!("rust-analyzer-{}-apple-darwin.gz", consts::ARCH);
+            let asset = release
+                .assets
+                .iter()
+                .find(|asset| asset.name == asset_name)
+                .ok_or_else(|| anyhow!("no release found matching {:?}", asset_name))?;
+            Ok(LspBinaryVersion {
+                name: release.name,
+                url: Some(asset.browser_download_url.clone()),
+            })
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: LspBinaryVersion,
+        http: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        async move {
+            let destination_path = container_dir.join(format!("rust-analyzer-{}", version.name));
+
+            if fs::metadata(&destination_path).await.is_err() {
+                let response = http
+                    .send(
+                        surf::RequestBuilder::new(Method::Get, version.url.unwrap())
+                            .middleware(surf::middleware::Redirect::default())
+                            .build(),
+                    )
+                    .await
+                    .map_err(|err| anyhow!("error downloading release: {}", err))?;
+                let decompressed_bytes = GzipDecoder::new(response);
+                let mut file = File::create(&destination_path).await?;
+                futures::io::copy(decompressed_bytes, &mut file).await?;
+                fs::set_permissions(
+                    &destination_path,
+                    <fs::Permissions as fs::unix::PermissionsExt>::from_mode(0o755),
+                )
+                .await?;
+
+                if let Some(mut entries) = fs::read_dir(&container_dir).await.log_err() {
+                    while let Some(entry) = entries.next().await {
+                        if let Some(entry) = entry.log_err() {
+                            let entry_path = entry.path();
+                            if entry_path.as_path() != destination_path {
+                                fs::remove_file(&entry_path).await.log_err();
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(destination_path)
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+        async move {
+            let mut last = None;
+            let mut entries = fs::read_dir(&container_dir).await?;
+            while let Some(entry) = entries.next().await {
+                last = Some(entry?.path());
+            }
+            last.ok_or_else(|| anyhow!("no cached binary"))
+        }
+        .log_err()
+        .boxed()
+    }
+
+    fn process_diagnostics(&self, params: &mut lsp::PublishDiagnosticsParams) {
+        lazy_static! {
+            static ref REGEX: Regex = Regex::new("(?m)`([^`]+)\n`$").unwrap();
+        }
+
+        for diagnostic in &mut params.diagnostics {
+            for message in diagnostic
+                .related_information
+                .iter_mut()
+                .flatten()
+                .map(|info| &mut info.message)
+                .chain([&mut diagnostic.message])
+            {
+                if let Cow::Owned(sanitized) = REGEX.replace_all(message, "`$1`") {
+                    *message = sanitized;
+                }
+            }
+        }
+    }
+
+    fn label_for_completion(
+        &self,
+        completion: &lsp::CompletionItem,
+        language: &Language,
+    ) -> Option<CodeLabel> {
+        match completion.kind {
+            Some(lsp::CompletionItemKind::FIELD) if completion.detail.is_some() => {
+                let detail = completion.detail.as_ref().unwrap();
+                let name = &completion.label;
+                let text = format!("{}: {}", name, detail);
+                let source = Rope::from(format!("struct S {{ {} }}", text).as_str());
+                let runs = language.highlight_text(&source, 11..11 + text.len());
+                return Some(CodeLabel {
+                    text,
+                    runs,
+                    filter_range: 0..name.len(),
+                });
+            }
+            Some(lsp::CompletionItemKind::CONSTANT | lsp::CompletionItemKind::VARIABLE)
+                if completion.detail.is_some() =>
+            {
+                let detail = completion.detail.as_ref().unwrap();
+                let name = &completion.label;
+                let text = format!("{}: {}", name, detail);
+                let source = Rope::from(format!("let {} = ();", text).as_str());
+                let runs = language.highlight_text(&source, 4..4 + text.len());
+                return Some(CodeLabel {
+                    text,
+                    runs,
+                    filter_range: 0..name.len(),
+                });
+            }
+            Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD)
+                if completion.detail.is_some() =>
+            {
+                lazy_static! {
+                    static ref REGEX: Regex = Regex::new("\\(…?\\)").unwrap();
+                }
+
+                let detail = completion.detail.as_ref().unwrap();
+                if detail.starts_with("fn(") {
+                    let text = REGEX.replace(&completion.label, &detail[2..]).to_string();
+                    let source = Rope::from(format!("fn {} {{}}", text).as_str());
+                    let runs = language.highlight_text(&source, 3..3 + text.len());
+                    return Some(CodeLabel {
+                        filter_range: 0..completion.label.find('(').unwrap_or(text.len()),
+                        text,
+                        runs,
+                    });
+                }
+            }
+            Some(kind) => {
+                let highlight_name = match kind {
+                    lsp::CompletionItemKind::STRUCT
+                    | lsp::CompletionItemKind::INTERFACE
+                    | lsp::CompletionItemKind::ENUM => Some("type"),
+                    lsp::CompletionItemKind::ENUM_MEMBER => Some("variant"),
+                    lsp::CompletionItemKind::KEYWORD => Some("keyword"),
+                    lsp::CompletionItemKind::VALUE | lsp::CompletionItemKind::CONSTANT => {
+                        Some("constant")
+                    }
+                    _ => None,
+                };
+                let highlight_id = language.grammar()?.highlight_id_for_name(highlight_name?)?;
+                let mut label = CodeLabel::plain(completion.label.clone(), None);
+                label.runs.push((
+                    0..label.text.rfind('(').unwrap_or(label.text.len()),
+                    highlight_id,
+                ));
+                return Some(label);
+            }
+            _ => {}
+        }
+        None
+    }
+
+    fn label_for_symbol(
+        &self,
+        name: &str,
+        kind: lsp::SymbolKind,
+        language: &Language,
+    ) -> Option<CodeLabel> {
+        let (text, filter_range, display_range) = match kind {
+            lsp::SymbolKind::METHOD | lsp::SymbolKind::FUNCTION => {
+                let text = format!("fn {} () {{}}", name);
+                let filter_range = 3..3 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::STRUCT => {
+                let text = format!("struct {} {{}}", name);
+                let filter_range = 7..7 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::ENUM => {
+                let text = format!("enum {} {{}}", name);
+                let filter_range = 5..5 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::INTERFACE => {
+                let text = format!("trait {} {{}}", name);
+                let filter_range = 6..6 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::CONSTANT => {
+                let text = format!("const {}: () = ();", name);
+                let filter_range = 6..6 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::MODULE => {
+                let text = format!("mod {} {{}}", name);
+                let filter_range = 4..4 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            lsp::SymbolKind::TYPE_PARAMETER => {
+                let text = format!("type {} {{}}", name);
+                let filter_range = 5..5 + name.len();
+                let display_range = 0..filter_range.end;
+                (text, filter_range, display_range)
+            }
+            _ => return None,
+        };
+
+        Some(CodeLabel {
+            runs: language.highlight_text(&text.as_str().into(), display_range.clone()),
+            text: text[display_range].to_string(),
+            filter_range,
+        })
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::languages::{language, LspAdapter};
+    use gpui::color::Color;
+    use theme::SyntaxTheme;
+
+    #[test]
+    fn test_process_rust_diagnostics() {
+        let mut params = lsp::PublishDiagnosticsParams {
+            uri: lsp::Url::from_file_path("/a").unwrap(),
+            version: None,
+            diagnostics: vec![
+                // no newlines
+                lsp::Diagnostic {
+                    message: "use of moved value `a`".to_string(),
+                    ..Default::default()
+                },
+                // newline at the end of a code span
+                lsp::Diagnostic {
+                    message: "consider importing this struct: `use b::c;\n`".to_string(),
+                    ..Default::default()
+                },
+                // code span starting right after a newline
+                lsp::Diagnostic {
+                    message: "cannot borrow `self.d` as mutable\n`self` is a `&` reference"
+                        .to_string(),
+                    ..Default::default()
+                },
+            ],
+        };
+        RustLspAdapter.process_diagnostics(&mut params);
+
+        assert_eq!(params.diagnostics[0].message, "use of moved value `a`");
+
+        // remove trailing newline from code span
+        assert_eq!(
+            params.diagnostics[1].message,
+            "consider importing this struct: `use b::c;`"
+        );
+
+        // do not remove newline before the start of code span
+        assert_eq!(
+            params.diagnostics[2].message,
+            "cannot borrow `self.d` as mutable\n`self` is a `&` reference"
+        );
+    }
+
+    #[test]
+    fn test_rust_label_for_completion() {
+        let language = language(
+            "rust",
+            tree_sitter_rust::language(),
+            Some(Arc::new(RustLspAdapter)),
+        );
+        let grammar = language.grammar().unwrap();
+        let theme = SyntaxTheme::new(vec![
+            ("type".into(), Color::green().into()),
+            ("keyword".into(), Color::blue().into()),
+            ("function".into(), Color::red().into()),
+            ("property".into(), Color::white().into()),
+        ]);
+
+        language.set_theme(&theme);
+
+        let highlight_function = grammar.highlight_id_for_name("function").unwrap();
+        let highlight_type = grammar.highlight_id_for_name("type").unwrap();
+        let highlight_keyword = grammar.highlight_id_for_name("keyword").unwrap();
+        let highlight_field = grammar.highlight_id_for_name("property").unwrap();
+
+        assert_eq!(
+            language.label_for_completion(&lsp::CompletionItem {
+                kind: Some(lsp::CompletionItemKind::FUNCTION),
+                label: "hello(…)".to_string(),
+                detail: Some("fn(&mut Option<T>) -> Vec<T>".to_string()),
+                ..Default::default()
+            }),
+            Some(CodeLabel {
+                text: "hello(&mut Option<T>) -> Vec<T>".to_string(),
+                filter_range: 0..5,
+                runs: vec![
+                    (0..5, highlight_function),
+                    (7..10, highlight_keyword),
+                    (11..17, highlight_type),
+                    (18..19, highlight_type),
+                    (25..28, highlight_type),
+                    (29..30, highlight_type),
+                ],
+            })
+        );
+
+        assert_eq!(
+            language.label_for_completion(&lsp::CompletionItem {
+                kind: Some(lsp::CompletionItemKind::FIELD),
+                label: "len".to_string(),
+                detail: Some("usize".to_string()),
+                ..Default::default()
+            }),
+            Some(CodeLabel {
+                text: "len: usize".to_string(),
+                filter_range: 0..3,
+                runs: vec![(0..3, highlight_field), (5..10, highlight_type),],
+            })
+        );
+
+        assert_eq!(
+            language.label_for_completion(&lsp::CompletionItem {
+                kind: Some(lsp::CompletionItemKind::FUNCTION),
+                label: "hello(…)".to_string(),
+                detail: Some("fn(&mut Option<T>) -> Vec<T>".to_string()),
+                ..Default::default()
+            }),
+            Some(CodeLabel {
+                text: "hello(&mut Option<T>) -> Vec<T>".to_string(),
+                filter_range: 0..5,
+                runs: vec![
+                    (0..5, highlight_function),
+                    (7..10, highlight_keyword),
+                    (11..17, highlight_type),
+                    (18..19, highlight_type),
+                    (25..28, highlight_type),
+                    (29..30, highlight_type),
+                ],
+            })
+        );
+    }
+
+    #[test]
+    fn test_rust_label_for_symbol() {
+        let language = language(
+            "rust",
+            tree_sitter_rust::language(),
+            Some(Arc::new(RustLspAdapter)),
+        );
+        let grammar = language.grammar().unwrap();
+        let theme = SyntaxTheme::new(vec![
+            ("type".into(), Color::green().into()),
+            ("keyword".into(), Color::blue().into()),
+            ("function".into(), Color::red().into()),
+            ("property".into(), Color::white().into()),
+        ]);
+
+        language.set_theme(&theme);
+
+        let highlight_function = grammar.highlight_id_for_name("function").unwrap();
+        let highlight_type = grammar.highlight_id_for_name("type").unwrap();
+        let highlight_keyword = grammar.highlight_id_for_name("keyword").unwrap();
+
+        assert_eq!(
+            language.label_for_symbol("hello", lsp::SymbolKind::FUNCTION),
+            Some(CodeLabel {
+                text: "fn hello".to_string(),
+                filter_range: 3..8,
+                runs: vec![(0..2, highlight_keyword), (3..8, highlight_function)],
+            })
+        );
+
+        assert_eq!(
+            language.label_for_symbol("World", lsp::SymbolKind::TYPE_PARAMETER),
+            Some(CodeLabel {
+                text: "type World".to_string(),
+                filter_range: 5..10,
+                runs: vec![(0..4, highlight_keyword), (5..10, highlight_type)],
+            })
+        );
+    }
+}

crates/zed/src/languages/rust/brackets.scm

@@ -0,0 +1,6 @@
+("(" @open ")" @close)
+("[" @open "]" @close)
+("{" @open "}" @close)
+("<" @open ">" @close)
+("\"" @open "\"" @close)
+(closure_parameters "|" @open "|" @close)

crates/zed/src/languages/rust/config.toml

@@ -0,0 +1,16 @@
+name = "Rust"
+path_suffixes = ["rs"]
+line_comment = "// "
+autoclose_before = ";:.,=}])>"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "<", end = ">", close = false, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false },
+    { start = "/*", end = " */", close = true, newline = false },
+]
+
+[language_server]
+disk_based_diagnostic_sources = ["rustc"]
+disk_based_diagnostics_progress_token = "rustAnalyzer/cargo check"

crates/zed/src/languages/rust/highlights.scm

@@ -0,0 +1,83 @@
+(type_identifier) @type
+(primitive_type) @type.builtin
+
+(field_identifier) @property
+
+(call_expression
+  function: [
+    (identifier) @function
+    (scoped_identifier
+      name: (identifier) @function)
+    (field_expression
+      field: (field_identifier) @function.method)
+  ])
+
+(function_item name: (identifier) @function.definition)
+(function_signature_item name: (identifier) @function.definition)
+
+; Identifier conventions
+
+; Assume uppercase names are enum constructors
+((identifier) @variant
+ (#match? @variant "^[A-Z]"))
+
+; Assume that uppercase names in paths are types
+((scoped_identifier
+  path: (identifier) @type)
+ (#match? @type "^[A-Z]"))
+((scoped_identifier
+  path: (scoped_identifier
+    name: (identifier) @type))
+ (#match? @type "^[A-Z]"))
+
+; Assume all-caps names are constants
+((identifier) @constant
+ (#match? @constant "^[A-Z][A-Z\\d_]+$"))
+
+[
+  "as"
+  "async"
+  "break"
+  "const"
+  "continue"
+  "default"
+  "dyn"
+  "else"
+  "enum"
+  "extern"
+  "for"
+  "fn"
+  "if"
+  "in"
+  "impl"
+  "let"
+  "loop"
+  "macro_rules!"
+  "match"
+  "mod"
+  "move"
+  "pub"
+  "return"
+  "static"
+  "struct"
+  "trait"
+  "type"
+  "use"
+  "where"
+  "while"
+  "union"
+  "unsafe"
+  (mutable_specifier)
+  (super)
+] @keyword
+
+[
+  (string_literal)
+  (raw_string_literal)
+  (char_literal)
+] @string
+
+[
+  (line_comment)
+  (block_comment)
+] @comment

crates/zed/src/languages/rust/indents.scm

@@ -0,0 +1,12 @@
+[
+    ((where_clause) _ @end)
+    (field_expression)
+    (call_expression)
+    (assignment_expression)
+    (let_declaration)
+] @indent
+
+(_ "[" "]" @end) @indent
+(_ "<" ">" @end) @indent
+(_ "{" "}" @end) @indent
+(_ "(" ")" @end) @indent

crates/zed/src/languages/rust/outline.scm

@@ -0,0 +1,63 @@
+(struct_item
+    (visibility_modifier)? @context
+    "struct" @context
+    name: (_) @name) @item
+
+(enum_item
+    (visibility_modifier)? @context
+    "enum" @context
+    name: (_) @name) @item
+
+(enum_variant
+    (visibility_modifier)? @context
+    name: (_) @name) @item
+
+(impl_item
+    "impl" @context
+    trait: (_)? @name
+    "for"? @context
+    type: (_) @name) @item
+
+(trait_item
+    (visibility_modifier)? @context
+    "trait" @context
+    name: (_) @name) @item
+
+(function_item
+    (visibility_modifier)? @context
+    (function_modifiers)? @context
+    "fn" @context
+    name: (_) @name) @item
+
+(function_signature_item
+    (visibility_modifier)? @context
+    (function_modifiers)? @context
+    "fn" @context
+    name: (_) @name) @item
+
+(macro_definition
+    . "macro_rules!" @context
+    name: (_) @name) @item
+
+(mod_item
+    (visibility_modifier)? @context
+    "mod" @context
+    name: (_) @name) @item
+
+(type_item
+    (visibility_modifier)? @context
+    "type" @context
+    name: (_) @name) @item
+
+(associated_type
+    "type" @context
+    name: (_) @name) @item
+
+(const_item
+    (visibility_modifier)? @context
+    "const" @context
+    name: (_) @name) @item
+
+(field_declaration
+    (visibility_modifier)? @context
+    name: (_) @name) @item

crates/zed/src/languages/tsx/brackets.scm

@@ -0,0 +1 @@
+../typescript/brackets.scm

crates/zed/src/languages/tsx/config.toml

@@ -0,0 +1,12 @@
+name = "TSX"
+path_suffixes = ["tsx"]
+line_comment = "// "
+autoclose_before = ";:.,=}])>"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "<", end = ">", close = false, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false },
+    { start = "/*", end = " */", close = true, newline = false },
+]

crates/zed/src/languages/tsx/highlights.scm

@@ -0,0 +1 @@
+../typescript/highlights.scm

crates/zed/src/languages/tsx/indents.scm

@@ -0,0 +1 @@
+../typescript/indents.scm

crates/zed/src/languages/tsx/outline.scm

@@ -0,0 +1 @@
+../typescript/outline.scm

crates/zed/src/languages/typescript.rs

@@ -0,0 +1,121 @@
+pub struct TypeScriptLspAdapter;
+
+impl TypeScriptLspAdapter {
+    const BIN_PATH: &'static str =
+        "node_modules/vscode-json-languageserver/bin/vscode-json-languageserver";
+}
+
+impl super::LspAdapter for TypeScriptLspAdapter {
+    fn name(&self) -> &'static str {
+        "typescript-language-server"
+    }
+
+    fn server_args(&self) -> &[&str] {
+        &["--stdio"]
+    }
+
+    fn fetch_latest_server_version(
+        &self,
+        _: Arc<dyn HttpClient>,
+    ) -> BoxFuture<'static, Result<LspBinaryVersion>> {
+        async move {
+            #[derive(Deserialize)]
+            struct NpmInfo {
+                versions: Vec<String>,
+            }
+
+            let output = smol::process::Command::new("npm")
+                .args(["info", "vscode-json-languageserver", "--json"])
+                .output()
+                .await?;
+            if !output.status.success() {
+                Err(anyhow!("failed to execute npm info"))?;
+            }
+            let mut info: NpmInfo = serde_json::from_slice(&output.stdout)?;
+
+            Ok(LspBinaryVersion {
+                name: info
+                    .versions
+                    .pop()
+                    .ok_or_else(|| anyhow!("no versions found in npm info"))?,
+                url: Default::default(),
+            })
+        }
+        .boxed()
+    }
+
+    fn fetch_server_binary(
+        &self,
+        version: LspBinaryVersion,
+        _: Arc<dyn HttpClient>,
+        container_dir: PathBuf,
+    ) -> BoxFuture<'static, Result<PathBuf>> {
+        async move {
+            let version_dir = container_dir.join(&version.name);
+            fs::create_dir_all(&version_dir)
+                .await
+                .context("failed to create version directory")?;
+            let binary_path = version_dir.join(Self::BIN_PATH);
+
+            if fs::metadata(&binary_path).await.is_err() {
+                let output = smol::process::Command::new("npm")
+                    .current_dir(&version_dir)
+                    .arg("install")
+                    .arg(format!("vscode-json-languageserver@{}", version.name))
+                    .output()
+                    .await
+                    .context("failed to run npm install")?;
+                if !output.status.success() {
+                    Err(anyhow!("failed to install vscode-json-languageserver"))?;
+                }
+
+                if let Some(mut entries) = fs::read_dir(&container_dir).await.log_err() {
+                    while let Some(entry) = entries.next().await {
+                        if let Some(entry) = entry.log_err() {
+                            let entry_path = entry.path();
+                            if entry_path.as_path() != version_dir {
+                                fs::remove_dir_all(&entry_path).await.log_err();
+                            }
+                        }
+                    }
+                }
+            }
+
+            Ok(binary_path)
+        }
+        .boxed()
+    }
+
+    fn cached_server_binary(&self, container_dir: PathBuf) -> BoxFuture<'static, Option<PathBuf>> {
+        async move {
+            let mut last_version_dir = None;
+            let mut entries = fs::read_dir(&container_dir).await?;
+            while let Some(entry) = entries.next().await {
+                let entry = entry?;
+                if entry.file_type().await?.is_dir() {
+                    last_version_dir = Some(entry.path());
+                }
+            }
+            let last_version_dir = last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
+            let bin_path = last_version_dir.join(Self::BIN_PATH);
+            if bin_path.exists() {
+                Ok(bin_path)
+            } else {
+                Err(anyhow!(
+                    "missing executable in directory {:?}",
+                    last_version_dir
+                ))
+            }
+        }
+        .log_err()
+        .boxed()
+    }
+
+    fn process_diagnostics(&self, _: &mut lsp::PublishDiagnosticsParams) {}
+
+    fn initialization_options(&self) -> Option<serde_json::Value> {
+        Some(json!({
+            "provideFormatter": true
+        }))
+    }
+}

crates/zed/src/languages/typescript/brackets.scm

@@ -0,0 +1,5 @@
+("(" @open ")" @close)
+("[" @open "]" @close)
+("{" @open "}" @close)
+("<" @open ">" @close)
+("\"" @open "\"" @close)

crates/zed/src/languages/typescript/config.toml

@@ -0,0 +1,12 @@
+name = "TypeScript"
+path_suffixes = ["ts"]
+line_comment = "// "
+autoclose_before = ";:.,=}])>"
+brackets = [
+    { start = "{", end = "}", close = true, newline = true },
+    { start = "[", end = "]", close = true, newline = true },
+    { start = "(", end = ")", close = true, newline = true },
+    { start = "<", end = ">", close = false, newline = true },
+    { start = "\"", end = "\"", close = true, newline = false },
+    { start = "/*", end = " */", close = true, newline = false },
+]

crates/zed/src/languages/typescript/highlights.scm

@@ -0,0 +1,219 @@
+; Variables
+
+(identifier) @variable
+
+; Properties
+
+(property_identifier) @property
+
+; Function and method calls
+
+(call_expression
+  function: (identifier) @function)
+
+(call_expression
+  function: (member_expression
+    property: (property_identifier) @function.method))
+
+; Function and method definitions
+
+(function
+  name: (identifier) @function)
+(function_declaration
+  name: (identifier) @function)
+(method_definition
+  name: (property_identifier) @function.method)
+
+(pair
+  key: (property_identifier) @function.method
+  value: [(function) (arrow_function)])
+
+(assignment_expression
+  left: (member_expression
+    property: (property_identifier) @function.method)
+  right: [(function) (arrow_function)])
+
+(variable_declarator
+  name: (identifier) @function
+  value: [(function) (arrow_function)])
+
+(assignment_expression
+  left: (identifier) @function
+  right: [(function) (arrow_function)])
+
+; Special identifiers
+
+((identifier) @constructor
+ (#match? @constructor "^[A-Z]"))
+
+([
+  (identifier)
+  (shorthand_property_identifier)
+  (shorthand_property_identifier_pattern)
+ ] @constant
+ (#match? @constant "^[A-Z_][A-Z\\d_]+$"))
+
+; Literals
+
+(this) @variable.builtin
+(super) @variable.builtin
+
+[
+  (true)
+  (false)
+  (null)
+  (undefined)
+] @constant.builtin
+
+(comment) @comment
+
+[
+  (string)
+  (template_string)
+] @string
+
+(regex) @string.special
+(number) @number
+
+; Tokens
+
+(template_substitution
+  "${" @punctuation.special
+  "}" @punctuation.special) @embedded
+
+[
+  ";"
+  "?."
+  "."
+  ","
+] @punctuation.delimiter
+
+[
+  "-"
+  "--"
+  "-="
+  "+"
+  "++"
+  "+="
+  "*"
+  "*="
+  "**"
+  "**="
+  "/"
+  "/="
+  "%"
+  "%="
+  "<"
+  "<="
+  "<<"
+  "<<="
+  "="
+  "=="
+  "==="
+  "!"
+  "!="
+  "!=="
+  "=>"
+  ">"
+  ">="
+  ">>"
+  ">>="
+  ">>>"
+  ">>>="
+  "~"
+  "^"
+  "&"
+  "|"
+  "^="
+  "&="
+  "|="
+  "&&"
+  "||"
+  "??"
+  "&&="
+  "||="
+  "??="
+] @operator
+
+[
+  "("
+  ")"
+  "["
+  "]"
+  "{"
+  "}"
+]  @punctuation.bracket
+
+[
+  "as"
+  "async"
+  "await"
+  "break"
+  "case"
+  "catch"
+  "class"
+  "const"
+  "continue"
+  "debugger"
+  "default"
+  "delete"
+  "do"
+  "else"
+  "export"
+  "extends"
+  "finally"
+  "for"
+  "from"
+  "function"
+  "get"
+  "if"
+  "import"
+  "in"
+  "instanceof"
+  "let"
+  "new"
+  "of"
+  "return"
+  "set"
+  "static"
+  "switch"
+  "target"
+  "throw"
+  "try"
+  "typeof"
+  "var"
+  "void"
+  "while"
+  "with"
+  "yield"
+] @keyword
+
+; Types
+
+(type_identifier) @type
+(predefined_type) @type.builtin
+
+((identifier) @type
+ (#match? @type "^[A-Z]"))
+
+(type_arguments
+  "<" @punctuation.bracket
+  ">" @punctuation.bracket)
+
+; Keywords
+
+[ "abstract"
+  "declare"
+  "enum"
+  "export"
+  "implements"
+  "interface"
+  "keyof"
+  "namespace"
+  "private"
+  "protected"
+  "public"
+  "type"
+  "readonly"
+  "override"
+] @keyword

crates/zed/src/languages/typescript/indents.scm

@@ -0,0 +1,15 @@
+[
+    (call_expression)
+    (assignment_expression)
+    (member_expression)
+    (lexical_declaration)
+    (variable_declaration)
+    (assignment_expression)
+    (if_statement)
+    (for_statement)
+] @indent
+
+(_ "[" "]" @end) @indent
+(_ "<" ">" @end) @indent
+(_ "{" "}" @end) @indent
+(_ "(" ")" @end) @indent

crates/zed/src/languages/typescript/outline.scm

@@ -0,0 +1,55 @@
+(internal_module
+    "namespace" @context
+    name: (_) @name) @item
+
+(enum_declaration
+    "enum" @context
+    name: (_) @name) @item
+
+(function_declaration
+    "async"? @context
+    "function" @context
+    name: (_) @name
+    parameters: (formal_parameters
+      "(" @context
+      ")" @context)) @item
+
+(interface_declaration
+    "interface" @context
+    name: (_) @name) @item
+
+(program
+    (lexical_declaration
+        ["let" "const"] @context
+        (variable_declarator
+            name: (_) @name) @item))
+
+(class_declaration
+    "class" @context
+    name: (_) @name) @item
+
+(method_definition
+    [
+        "get"
+        "set"
+        "async"
+        "*"
+        "readonly"
+        "static"
+        (override_modifier)
+        (accessibility_modifier)
+    ]* @context
+    name: (_) @name
+    parameters: (formal_parameters
+      "(" @context
+      ")" @context)) @item
+
+(public_field_definition
+    [
+        "declare"
+        "readonly"
+        "abstract"
+        "static"
+        (accessibility_modifier)
+    ]* @context
+    name: (_) @name) @item