use anyhow::{Context as _, Result};use async_trait::async_trait;use collections::HashMap;use futures::StreamExt;use gpui::{App, AppContext, AsyncApp, SharedString, Task};use http_client::github::AssetKind;use http_client::github::{GitHubLspBinaryVersion, latest_github_release};pub use language::*;use lsp::{InitializeParams, LanguageServerBinary};use project::Fs;use project::lsp_store::rust_analyzer_ext::CARGO_DIAGNOSTICS_SOURCE_NAME;use project::project_settings::ProjectSettings;use regex::Regex;use serde_json::json;use settings::Settings as _;use smol::fs::{self};use std::fmt::Display;use std::ops::Range;use std::{    any::Any,    borrow::Cow,    path::{Path, PathBuf},    sync::{Arc, LazyLock},};use task::{TaskTemplate, TaskTemplates, TaskVariables, VariableName};use util::fs::{make_file_executable, remove_matching};use util::merge_json_value_into;use util::{ResultExt, maybe}; use crate::github_download::{GithubBinaryMetadata, download_server_binary};use crate::language_settings::language_settings; pub struct RustLspAdapter; #[cfg(target_os = "macos")]impl RustLspAdapter {    const GITHUB_ASSET_KIND: AssetKind = AssetKind::Gz;    const ARCH_SERVER_NAME: &str = "apple-darwin";} #[cfg(target_os = "linux")]impl RustLspAdapter {    const GITHUB_ASSET_KIND: AssetKind = AssetKind::Gz;    const ARCH_SERVER_NAME: &str = "unknown-linux-gnu";} #[cfg(target_os = "freebsd")]impl RustLspAdapter {    const GITHUB_ASSET_KIND: AssetKind = AssetKind::Gz;    const ARCH_SERVER_NAME: &str = "unknown-freebsd";} #[cfg(target_os = "windows")]impl RustLspAdapter {    const GITHUB_ASSET_KIND: AssetKind = AssetKind::Zip;    const ARCH_SERVER_NAME: &str = "pc-windows-msvc";} const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("rust-analyzer"); impl RustLspAdapter {    fn build_asset_name() -> String {        let extension = match Self::GITHUB_ASSET_KIND {            AssetKind::TarGz => "tar.gz",            AssetKind::Gz => "gz",            AssetKind::Zip => "zip",        };         format!(            "{}-{}-{}.{}",            SERVER_NAME,            std::env::consts::ARCH,            Self::ARCH_SERVER_NAME,            extension        )    }} pub(crate) struct CargoManifestProvider; impl ManifestProvider for CargoManifestProvider {    fn name(&self) -> ManifestName {        SharedString::new_static("Cargo.toml").into()    }     fn search(        &self,        ManifestQuery {            path,            depth,            delegate,        }: ManifestQuery,    ) -> Option<Arc<Path>> {        let mut outermost_cargo_toml = None;        for path in path.ancestors().take(depth) {            let p = path.join("Cargo.toml");            if delegate.exists(&p, Some(false)) {                outermost_cargo_toml = Some(Arc::from(path));            }        }         outermost_cargo_toml    }} #[async_trait(?Send)]impl LspAdapter for RustLspAdapter {    fn name(&self) -> LanguageServerName {        SERVER_NAME    }     async fn check_if_user_installed(        &self,        delegate: &dyn LspAdapterDelegate,        _: Option<Toolchain>,        _: &AsyncApp,    ) -> Option<LanguageServerBinary> {        let path = delegate.which("rust-analyzer".as_ref()).await?;        let env = delegate.shell_env().await;         // It is surprisingly common for ~/.cargo/bin/rust-analyzer to be a symlink to        // /usr/bin/rust-analyzer that fails when you run it; so we need to test it.        log::info!("found rust-analyzer in PATH. trying to run `rust-analyzer --help`");        let result = delegate            .try_exec(LanguageServerBinary {                path: path.clone(),                arguments: vec!["--help".into()],                env: Some(env.clone()),            })            .await;        if let Err(err) = result {            log::debug!(                "failed to run rust-analyzer after detecting it in PATH: binary: {:?}: {}",                path,                err            );            return None;        }         Some(LanguageServerBinary {            path,            env: Some(env),            arguments: vec![],        })    }     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 asset_name = Self::build_asset_name();        let asset = release            .assets            .into_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,            digest: asset.digest,        }))    }     async fn fetch_server_binary(        &self,        version: Box<dyn 'static + Send + Any>,        container_dir: PathBuf,        delegate: &dyn LspAdapterDelegate,    ) -> Result<LanguageServerBinary> {        let GitHubLspBinaryVersion {            name,            url,            digest: expected_digest,        } = *version.downcast::<GitHubLspBinaryVersion>().unwrap();        let destination_path = container_dir.join(format!("rust-analyzer-{name}"));        let server_path = match Self::GITHUB_ASSET_KIND {            AssetKind::TarGz | AssetKind::Gz => destination_path.clone(), // Tar and gzip extract in place.            AssetKind::Zip => destination_path.clone().join("rust-analyzer.exe"), // zip contains a .exe        };         let binary = LanguageServerBinary {            path: server_path.clone(),            env: None,            arguments: Default::default(),        };         let metadata_path = destination_path.with_extension("metadata");        let metadata = GithubBinaryMetadata::read_from_file(&metadata_path)            .await            .ok();        if let Some(metadata) = metadata {            let validity_check = async || {                delegate                    .try_exec(LanguageServerBinary {                        path: server_path.clone(),                        arguments: vec!["--version".into()],                        env: None,                    })                    .await                    .inspect_err(|err| {                        log::warn!("Unable to run {server_path:?} asset, redownloading: {err}",)                    })            };            if let (Some(actual_digest), Some(expected_digest)) =                (&metadata.digest, &expected_digest)            {                if actual_digest == expected_digest {                    if validity_check().await.is_ok() {                        return Ok(binary);                    }                } else {                    log::info!(                        "SHA-256 mismatch for {destination_path:?} asset, downloading new asset. Expected: {expected_digest}, Got: {actual_digest}"                    );                }            } else if validity_check().await.is_ok() {                return Ok(binary);            }        }         download_server_binary(            delegate,            &url,            expected_digest.as_deref(),            &destination_path,            Self::GITHUB_ASSET_KIND,        )        .await?;        make_file_executable(&server_path).await?;        remove_matching(&container_dir, |path| path != destination_path).await;        GithubBinaryMetadata::write_to_file(            &GithubBinaryMetadata {                metadata_version: 1,                digest: expected_digest,            },            &metadata_path,        )        .await?;         Ok(LanguageServerBinary {            path: server_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    }     fn disk_based_diagnostic_sources(&self) -> Vec<String> {        vec![CARGO_DIAGNOSTICS_SOURCE_NAME.to_owned()]    }     fn disk_based_diagnostics_progress_token(&self) -> Option<String> {        Some("rust-analyzer/flycheck".into())    }     fn process_diagnostics(        &self,        params: &mut lsp::PublishDiagnosticsParams,        _: LanguageServerId,        _: Option<&'_ Buffer>,    ) {        static REGEX: LazyLock<Regex> =            LazyLock::new(|| Regex::new(r"(?m)`([^`]+)\n`$").expect("Failed to create REGEX"));         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 diagnostic_message_to_markdown(&self, message: &str) -> Option<String> {        static REGEX: LazyLock<Regex> =            LazyLock::new(|| Regex::new(r"(?m)\n *").expect("Failed to create REGEX"));        Some(REGEX.replace_all(message, "\n\n").to_string())    }     async fn label_for_completion(        &self,        completion: &lsp::CompletionItem,        language: &Arc<Language>,    ) -> Option<CodeLabel> {        // rust-analyzer calls these detail left and detail right in terms of where it expects things to be rendered        // this usually contains signatures of the thing to be completed        let detail_right = completion            .label_details            .as_ref()            .and_then(|detail| detail.description.as_ref())            .or(completion.detail.as_ref())            .map(|detail| detail.trim());        // this tends to contain alias and import information        let detail_left = completion            .label_details            .as_ref()            .and_then(|detail| detail.detail.as_deref());        let mk_label = |text: String, filter_range: &dyn Fn() -> Range<usize>, runs| {            let filter_range = completion                .filter_text                .as_deref()                .and_then(|filter| text.find(filter).map(|ix| ix..ix + filter.len()))                .or_else(|| {                    text.find(&completion.label)                        .map(|ix| ix..ix + completion.label.len())                })                .unwrap_or_else(filter_range);             CodeLabel {                text,                runs,                filter_range,            }        };        let mut label = match (detail_right, completion.kind) {            (Some(signature), Some(lsp::CompletionItemKind::FIELD)) => {                let name = &completion.label;                let text = format!("{name}: {signature}");                let prefix = "struct S { ";                let source = Rope::from_iter([prefix, &text, " }"]);                let runs =                    language.highlight_text(&source, prefix.len()..prefix.len() + text.len());                mk_label(text, &|| 0..completion.label.len(), runs)            }            (                Some(signature),                Some(lsp::CompletionItemKind::CONSTANT | lsp::CompletionItemKind::VARIABLE),            ) if completion.insert_text_format != Some(lsp::InsertTextFormat::SNIPPET) => {                let name = &completion.label;                let text = format!("{name}: {signature}",);                let prefix = "let ";                let source = Rope::from_iter([prefix, &text, " = ();"]);                let runs =                    language.highlight_text(&source, prefix.len()..prefix.len() + text.len());                mk_label(text, &|| 0..completion.label.len(), runs)            }            (                function_signature,                Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD),            ) => {                const FUNCTION_PREFIXES: [&str; 6] = [                    "async fn",                    "async unsafe fn",                    "const fn",                    "const unsafe fn",                    "unsafe fn",                    "fn",                ];                let fn_prefixed = FUNCTION_PREFIXES.iter().find_map(|&prefix| {                    function_signature?                        .strip_prefix(prefix)                        .map(|suffix| (prefix, suffix))                });                let label = if let Some(label) = completion                    .label                    .strip_suffix("(…)")                    .or_else(|| completion.label.strip_suffix("()"))                {                    label                } else {                    &completion.label                };                 static FULL_SIGNATURE_REGEX: LazyLock<Regex> =                    LazyLock::new(|| Regex::new(r"fn (.?+)\(").expect("Failed to create REGEX"));                if let Some((function_signature, match_)) = function_signature                    .filter(|it| it.contains(&label))                    .and_then(|it| Some((it, FULL_SIGNATURE_REGEX.find(it)?)))                {                    let source = Rope::from(function_signature);                    let runs = language.highlight_text(&source, 0..function_signature.len());                    mk_label(                        function_signature.to_owned(),                        &|| match_.range().start - 3..match_.range().end - 1,                        runs,                    )                } else if let Some((prefix, suffix)) = fn_prefixed {                    let text = format!("{label}{suffix}");                    let source = Rope::from_iter([prefix, " ", &text, " {}"]);                    let run_start = prefix.len() + 1;                    let runs = language.highlight_text(&source, run_start..run_start + text.len());                    mk_label(text, &|| 0..label.len(), runs)                } else if completion                    .detail                    .as_ref()                    .is_some_and(|detail| detail.starts_with("macro_rules! "))                {                    let text = completion.label.clone();                    let len = text.len();                    let source = Rope::from(text.as_str());                    let runs = language.highlight_text(&source, 0..len);                    mk_label(text, &|| 0..completion.label.len(), runs)                } else if detail_left.is_none() {                    return None;                } else {                    mk_label(                        completion.label.clone(),                        &|| 0..completion.label.len(),                        vec![],                    )                }            }            (_, kind) => {                let highlight_name = kind.and_then(|kind| 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 label = completion.label.clone();                let mut runs = vec![];                if let Some(highlight_name) = highlight_name {                    let highlight_id = language.grammar()?.highlight_id_for_name(highlight_name)?;                    runs.push((                        0..label.rfind('(').unwrap_or(completion.label.len()),                        highlight_id,                    ));                } else if detail_left.is_none() {                    return None;                }                 mk_label(label, &|| 0..completion.label.len(), runs)            }        };         if let Some(detail_left) = detail_left {            label.text.push(' ');            if !detail_left.starts_with('(') {                label.text.push('(');            }            label.text.push_str(detail_left);            if !detail_left.ends_with(')') {                label.text.push(')');            }        }        Some(label)    }     async fn label_for_symbol(        &self,        name: &str,        kind: lsp::SymbolKind,        language: &Arc<Language>,    ) -> Option<CodeLabel> {        let (prefix, suffix) = match kind {            lsp::SymbolKind::METHOD | lsp::SymbolKind::FUNCTION => ("fn ", " () {}"),            lsp::SymbolKind::STRUCT => ("struct ", " {}"),            lsp::SymbolKind::ENUM => ("enum ", " {}"),            lsp::SymbolKind::INTERFACE => ("trait ", " {}"),            lsp::SymbolKind::CONSTANT => ("const ", ": () = ();"),            lsp::SymbolKind::MODULE => ("mod ", " {}"),            lsp::SymbolKind::TYPE_PARAMETER => ("type ", " {}"),            _ => return None,        };         let filter_range = prefix.len()..prefix.len() + name.len();        let display_range = 0..filter_range.end;        Some(CodeLabel {            runs: language.highlight_text(&Rope::from_iter([prefix, name, suffix]), display_range),            text: format!("{prefix}{name}"),            filter_range,        })    }     fn prepare_initialize_params(        &self,        mut original: InitializeParams,        cx: &App,    ) -> Result<InitializeParams> {        let enable_lsp_tasks = ProjectSettings::get_global(cx)            .lsp            .get(&SERVER_NAME)            .is_some_and(|s| s.enable_lsp_tasks);        if enable_lsp_tasks {

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