use anyhow::{anyhow, bail, Context, Result};use async_trait::async_trait;use futures::StreamExt;use gpui::AsyncApp;use http_client::github::{latest_github_release, GitHubLspBinaryVersion};pub use language::*;use lsp::{InitializeParams, LanguageServerBinary, LanguageServerName};use serde_json::json;use smol::fs::{self, File};use std::{any::Any, env::consts, path::PathBuf, sync::Arc};use util::{fs::remove_matching, maybe, merge_json_value_into, ResultExt}; pub struct CLspAdapter; impl CLspAdapter {    const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("clangd");} #[async_trait(?Send)]impl super::LspAdapter for CLspAdapter {    fn name(&self) -> LanguageServerName {        Self::SERVER_NAME.clone()    }     async fn check_if_user_installed(        &self,        delegate: &dyn LspAdapterDelegate,        _: Arc<dyn LanguageToolchainStore>,        _: &AsyncApp,    ) -> Option<LanguageServerBinary> {        let path = delegate.which(Self::SERVER_NAME.as_ref()).await?;        Some(LanguageServerBinary {            path,            arguments: vec![],            env: None,        })    }     async fn fetch_latest_server_version(        &self,        delegate: &dyn LspAdapterDelegate,    ) -> Result<Box<dyn 'static + Send + Any>> {        let release =            latest_github_release("clangd/clangd", true, false, delegate.http_client()).await?;        let os_suffix = match consts::OS {            "macos" => "mac",            "linux" => "linux",            "windows" => "windows",            other => bail!("Running on unsupported os: {other}"),        };        let asset_name = format!("clangd-{}-{}.zip", os_suffix, release.tag_name);        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!("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 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 = util::command::new_smol_command("unzip")                .current_dir(&container_dir)                .arg(&zip_path)                .output()                .await?                .status;            if !unzip_status.success() {                Err(anyhow!("failed to unzip clangd archive"))?;            }             remove_matching(&container_dir, |entry| entry != version_dir).await;        }         Ok(LanguageServerBinary {            path: binary_path,            env: None,            arguments: vec![],        })    }     async fn cached_server_binary(        &self,        container_dir: PathBuf,        _: &dyn LspAdapterDelegate,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir).await    }     async fn label_for_completion(        &self,        completion: &lsp::CompletionItem,        language: &Arc<Language>,    ) -> Option<CodeLabel> {        let label_detail = match &completion.label_details {            Some(label_detail) => match &label_detail.detail {                Some(detail) => detail.trim(),                None => "",            },            None => "",        };         let label = completion            .label            .strip_prefix('•')            .unwrap_or(&completion.label)            .trim()            .to_owned()            + label_detail;         match completion.kind {            Some(lsp::CompletionItemKind::FIELD) if completion.detail.is_some() => {                let detail = completion.detail.as_ref().unwrap();                let text = format!("{} {}", detail, label);                let source = Rope::from(format!("struct S {{ {} }}", text).as_str());                let runs = language.highlight_text(&source, 11..11 + text.len());                return Some(CodeLabel {                    filter_range: detail.len() + 1..text.len(),                    text,                    runs,                });            }            Some(lsp::CompletionItemKind::CONSTANT | lsp::CompletionItemKind::VARIABLE)                if completion.detail.is_some() =>            {                let detail = completion.detail.as_ref().unwrap();                let text = format!("{} {}", detail, label);                let runs = language.highlight_text(&Rope::from(text.as_str()), 0..text.len());                return Some(CodeLabel {                    filter_range: detail.len() + 1..text.len(),                    text,                    runs,                });            }            Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD)                if completion.detail.is_some() =>            {                let detail = completion.detail.as_ref().unwrap();                let text = format!("{} {}", detail, label);                let runs = language.highlight_text(&Rope::from(text.as_str()), 0..text.len());                let filter_start = detail.len() + 1;                let filter_end =                    if let Some(end) = text.rfind('(').filter(|end| *end > filter_start) {                        end                    } else {                        text.len()                    };                 return Some(CodeLabel {                    filter_range: filter_start..filter_end,                    text,                    runs,                });            }            Some(kind) => {                let highlight_name = match kind {                    lsp::CompletionItemKind::STRUCT                    | lsp::CompletionItemKind::INTERFACE                    | lsp::CompletionItemKind::CLASS                    | 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,                };                if let Some(highlight_id) = language                    .grammar()                    .and_then(|g| g.highlight_id_for_name(highlight_name?))                {                    let mut label = CodeLabel::plain(label.to_string(), None);                    label.runs.push((                        0..label.text.rfind('(').unwrap_or(label.text.len()),                        highlight_id,                    ));                    return Some(label);                }            }            _ => {}        }        Some(CodeLabel::plain(label.to_string(), 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!("void {} () {{}}", name);                let filter_range = 0..name.len();                let display_range = 5..5 + name.len();                (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 | lsp::SymbolKind::CLASS => {                let text = format!("class {} {{}}", 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 int {} = 0;", name);                let filter_range = 10..10 + name.len();                let display_range = 0..filter_range.end;                (text, filter_range, display_range)            }            lsp::SymbolKind::MODULE => {                let text = format!("namespace {} {{}}", name);                let filter_range = 10..10 + name.len();                let display_range = 0..filter_range.end;                (text, filter_range, display_range)            }            lsp::SymbolKind::TYPE_PARAMETER => {                let text = format!("typename {} {{}};", name);                let filter_range = 9..9 + 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,        })    }     fn prepare_initialize_params(        &self,        mut original: InitializeParams,    ) -> Result<InitializeParams> {        // enable clangd's dot-to-arrow feature.        let experimental = json!({            "textDocument": {                "completion" : {                    "editsNearCursor": true                },                "inactiveRegionsCapabilities": {                    "inactiveRegions": true,                }            }        });        if let Some(ref mut original_experimental) = original.capabilities.experimental {            merge_json_value_into(experimental, original_experimental);        } else {            original.capabilities.experimental = Some(experimental);        }        Ok(original)    }} async fn get_cached_server_binary(container_dir: PathBuf) -> Option<LanguageServerBinary> {    maybe!(async {        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(LanguageServerBinary {                path: clangd_bin,                env: None,                arguments: vec![],            })        } else {            Err(anyhow!(                "missing clangd binary in directory {:?}",                clangd_dir            ))        }    })    .await    .log_err()} #[cfg(test)]mod tests {    use gpui::{AppContext as _, BorrowAppContext, TestAppContext};    use language::{language_settings::AllLanguageSettings, AutoindentMode, Buffer};    use settings::SettingsStore;    use std::num::NonZeroU32;     #[gpui::test]    async fn test_c_autoindent(cx: &mut TestAppContext) {        // cx.executor().set_block_on_ticks(usize::MAX..=usize::MAX);        cx.update(|cx| {            let test_settings = SettingsStore::test(cx);            cx.set_global(test_settings);            language::init(cx);            cx.update_global::<SettingsStore, _>(|store, cx| {                store.update_user_settings::<AllLanguageSettings>(cx, |s| {                    s.defaults.tab_size = NonZeroU32::new(2);                });            });        });        let language = crate::language("c", tree_sitter_c::LANGUAGE.into());         cx.new(|cx| {            let mut buffer = Buffer::local("", cx).with_language(language, cx);             // empty function            buffer.edit([(0..0, "int main() {}")], None, cx);             // indent inside braces            let ix = buffer.len() - 1;            buffer.edit([(ix..ix, "\n\n")], Some(AutoindentMode::EachLine), cx);            assert_eq!(buffer.text(), "int main() {\n  \n}");             // indent body of single-statement if statement            let ix = buffer.len() - 2;            buffer.edit([(ix..ix, "if (a)\nb;")], Some(AutoindentMode::EachLine), cx);            assert_eq!(buffer.text(), "int main() {\n  if (a)\n    b;\n}");             // indent inside field expression            let ix = buffer.len() - 3;            buffer.edit([(ix..ix, "\n.c")], Some(AutoindentMode::EachLine), cx);            assert_eq!(buffer.text(), "int main() {\n  if (a)\n    b\n      .c;\n}");             buffer        });    }}