use anyhow::{anyhow, bail, Context, Result};use async_compression::futures::bufread::GzipDecoder;use async_trait::async_trait;use futures::{io::BufReader, StreamExt};use gpui::AsyncAppContext;use http::github::{latest_github_release, GitHubLspBinaryVersion};pub use language::*;use lazy_static::lazy_static;use lsp::LanguageServerBinary;use project::project_settings::ProjectSettings;use regex::Regex;use settings::Settings;use smol::fs::{self, File};use std::{    any::Any,    borrow::Cow,    env::consts,    path::{Path, PathBuf},    sync::Arc,};use task::{TaskTemplate, TaskTemplates, TaskVariables, VariableName};use util::{fs::remove_matching, maybe, ResultExt}; pub struct RustLspAdapter; impl RustLspAdapter {    const SERVER_NAME: &'static str = "rust-analyzer";} #[async_trait(?Send)]impl LspAdapter for RustLspAdapter {    fn name(&self) -> LanguageServerName {        LanguageServerName(Self::SERVER_NAME.into())    }     async fn check_if_user_installed(        &self,        _delegate: &dyn LspAdapterDelegate,        cx: &AsyncAppContext,    ) -> Option<LanguageServerBinary> {        let binary = cx            .update(|cx| {                ProjectSettings::get_global(cx)                    .lsp                    .get(Self::SERVER_NAME)                    .and_then(|s| s.binary.clone())            })            .ok()??;         let path = binary.path?;        Some(LanguageServerBinary {            path: path.into(),            arguments: binary                .arguments                .unwrap_or_default()                .iter()                .map(|arg| arg.into())                .collect(),            env: None,        })    }     async fn fetch_latest_server_version(        &self,        delegate: &dyn LspAdapterDelegate,    ) -> Result<Box<dyn 'static + Send + Any>> {        let release = latest_github_release(            "rust-lang/rust-analyzer",            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!("rust-analyzer-{}-{os}.gz", consts::ARCH);        let asset = release            .assets            .iter()            .find(|asset| asset.name == asset_name)            .with_context(|| format!("no asset found matching `{asset_name:?}`"))?;        Ok(Box::new(GitHubLspBinaryVersion {            name: release.tag_name,            url: asset.browser_download_url.clone(),        }))    }     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 destination_path = container_dir.join(format!("rust-analyzer-{}", version.name));         if fs::metadata(&destination_path).await.is_err() {            let mut response = delegate                .http_client()                .get(&version.url, Default::default(), true)                .await                .map_err(|err| anyhow!("error downloading release: {}", err))?;            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));            let mut file = File::create(&destination_path).await?;            futures::io::copy(decompressed_bytes, &mut file).await?;            // todo("windows")            #[cfg(not(windows))]            {                fs::set_permissions(                    &destination_path,                    <fs::Permissions as fs::unix::PermissionsExt>::from_mode(0o755),                )                .await?;            }             remove_matching(&container_dir, |entry| entry != destination_path).await;        }         Ok(LanguageServerBinary {            path: destination_path,            env: None,            arguments: Default::default(),        })    }     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            .map(|mut binary| {                binary.arguments = vec!["--help".into()];                binary            })    }     fn disk_based_diagnostic_sources(&self) -> Vec<String> {        vec!["rustc".into()]    }     fn disk_based_diagnostics_progress_token(&self) -> Option<String> {        Some("rust-analyzer/flycheck".into())    }     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;                }            }        }    }     async fn label_for_completion(        &self,        completion: &lsp::CompletionItem,        language: &Arc<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()                    && completion.insert_text_format != Some(lsp::InsertTextFormat::SNIPPET) =>            {                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();                const FUNCTION_PREFIXES: [&'static str; 2] = ["async fn", "fn"];                let prefix = FUNCTION_PREFIXES                    .iter()                    .find_map(|prefix| detail.strip_prefix(*prefix).map(|suffix| (prefix, suffix)));                // fn keyword should be followed by opening parenthesis.                if let Some((prefix, suffix)) = prefix {                    if suffix.starts_with('(') {                        let text = REGEX.replace(&completion.label, suffix).to_string();                        let source = Rope::from(format!("{prefix} {} {{}}", text).as_str());                        let run_start = prefix.len() + 1;                        let runs =                            language.highlight_text(&source, run_start..run_start + 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    }     async fn label_for_symbol(        &self,        name: &str,        kind: lsp::SymbolKind,        language: &Arc<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,        })    }} pub(crate) struct RustContextProvider; const RUST_PACKAGE_TASK_VARIABLE: VariableName =    VariableName::Custom(Cow::Borrowed("RUST_PACKAGE")); impl ContextProvider for RustContextProvider {    fn build_context(        &self,        _: Option<&Path>,        location: &Location,        cx: &mut gpui::AppContext,    ) -> Result<TaskVariables> {        let local_abs_path = location            .buffer            .read(cx)            .file()            .and_then(|file| Some(file.as_local()?.abs_path(cx)));        Ok(            if let Some(package_name) = local_abs_path                .as_deref()                .and_then(|local_abs_path| local_abs_path.parent())                .and_then(human_readable_package_name)            {                TaskVariables::from_iter(Some((RUST_PACKAGE_TASK_VARIABLE.clone(), package_name)))            } else {                TaskVariables::default()            },        )    }     fn associated_tasks(&self) -> Option<TaskTemplates> {        Some(TaskTemplates(vec![            TaskTemplate {                label: format!(                    "cargo check -p {}",                    RUST_PACKAGE_TASK_VARIABLE.template_value(),                ),                command: "cargo".into(),                args: vec![                    "check".into(),                    "-p".into(),                    RUST_PACKAGE_TASK_VARIABLE.template_value(),                ],                ..TaskTemplate::default()            },            TaskTemplate {                label: "cargo check --workspace --all-targets".into(),                command: "cargo".into(),                args: vec!["check".into(), "--workspace".into(), "--all-targets".into()],                ..TaskTemplate::default()            },            TaskTemplate {                label: format!(                    "cargo test -p {} {} -- --nocapture",                    RUST_PACKAGE_TASK_VARIABLE.template_value(),                    VariableName::Symbol.template_value(),                ),                command: "cargo".into(),                args: vec![                    "test".into(),                    "-p".into(),                    RUST_PACKAGE_TASK_VARIABLE.template_value(),                    VariableName::Symbol.template_value(),                    "--".into(),                    "--nocapture".into(),                ],                tags: vec!["rust-test".to_owned()],                ..TaskTemplate::default()            },            TaskTemplate {                label: format!(                    "cargo test -p {}",                    RUST_PACKAGE_TASK_VARIABLE.template_value()                ),                command: "cargo".into(),                args: vec![                    "test".into(),                    "-p".into(),                    RUST_PACKAGE_TASK_VARIABLE.template_value(),                ],                ..TaskTemplate::default()            },            TaskTemplate {                label: "cargo run".into(),                command: "cargo".into(),                args: vec!["run".into()],                ..TaskTemplate::default()            },            TaskTemplate {                label: "cargo clean".into(),                command: "cargo".into(),                args: vec!["clean".into()],                ..TaskTemplate::default()            },        ]))    }} fn human_readable_package_name(package_directory: &Path) -> Option<String> {    let pkgid = String::from_utf8(        std::process::Command::new("cargo")            .current_dir(package_directory)            .arg("pkgid")            .output()            .log_err()?            .stdout,    )    .ok()?;    Some(package_name_from_pkgid(&pkgid)?.to_owned())} // For providing local `cargo check -p $pkgid` task, we do not need most of the information we have returned.// Output example in the root of Zed project:// ```bash// ❯ cargo pkgid zed// path+file:///absolute/path/to/project/zed/crates/zed#0.131.0// ```// Another variant, if a project has a custom package name or hyphen in the name:// ```// path+file:///absolute/path/to/project/custom-package#my-custom-package@0.1.0// ```//// Extracts the package name from the output according to the spec:// https://doc.rust-lang.org/cargo/reference/pkgid-spec.html#specification-grammarfn package_name_from_pkgid(pkgid: &str) -> Option<&str> {    fn split_off_suffix(input: &str, suffix_start: char) -> &str {        match input.rsplit_once(suffix_start) {            Some((without_suffix, _)) => without_suffix,            None => input,        }    }     let (version_prefix, version_suffix) = pkgid.trim().rsplit_once('#')?;    let package_name = match version_suffix.rsplit_once('@') {        Some((custom_package_name, _version)) => custom_package_name,        None => {            let host_and_path = split_off_suffix(version_prefix, '?');            let (_, package_name) = host_and_path.rsplit_once('/')?;            package_name        }    };    Some(package_name)} async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {    maybe!(async {        let mut last = None;        let mut entries = fs::read_dir(&container_dir).await?;        while let Some(entry) = entries.next().await {            last = Some(entry?.path());        }         anyhow::Ok(LanguageServerBinary {            path: last.ok_or_else(|| anyhow!("no cached binary"))?,            env: None,            arguments: Default::default(),        })    })    .await    .log_err()} #[cfg(test)]mod tests {    use std::num::NonZeroU32;     use super::*;    use crate::language;    use gpui::{BorrowAppContext, Context, Hsla, TestAppContext};    use language::language_settings::AllLanguageSettings;    use settings::SettingsStore;    use theme::SyntaxTheme;     #[gpui::test]    async fn test_process_rust_diagnostics() {        let mut params = lsp::PublishDiagnosticsParams {            uri: lsp::Url::from_file_path("/a").unwrap(),            version: None,

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