use anyhow::{Context as _, Result, bail};use async_trait::async_trait;use futures::StreamExt;use gpui::{App, AsyncApp};use http_client::github::{AssetKind, GitHubLspBinaryVersion, latest_github_release};use http_client::github_download::{GithubBinaryMetadata, download_server_binary};pub use language::*;use lsp::{InitializeParams, LanguageServerBinary, LanguageServerName};use project::lsp_store::clangd_ext;use serde_json::json;use smol::fs;use std::{env::consts, path::PathBuf, sync::Arc};use util::{ResultExt, fs::remove_matching, maybe, merge_json_value_into}; pub struct CLspAdapter; impl CLspAdapter {    const SERVER_NAME: LanguageServerName = LanguageServerName::new_static("clangd");} impl LspInstaller for CLspAdapter {    type BinaryVersion = GitHubLspBinaryVersion;     async fn fetch_latest_server_version(        &self,        delegate: &dyn LspAdapterDelegate,        pre_release: bool,        _: &mut AsyncApp,    ) -> Result<GitHubLspBinaryVersion> {        ensure_arch_compatibility()?;         let release =            latest_github_release("clangd/clangd", true, pre_release, 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)            .with_context(|| format!("no asset found matching {asset_name:?}"))?;        let version = GitHubLspBinaryVersion {            name: release.tag_name,            url: asset.browser_download_url.clone(),            digest: asset.digest.clone(),        };        Ok(version)    }     async fn check_if_user_installed(        &self,        delegate: &dyn LspAdapterDelegate,        _: Option<Toolchain>,        _: &AsyncApp,    ) -> Option<LanguageServerBinary> {        let path = delegate.which(Self::SERVER_NAME.as_ref()).await?;        Some(LanguageServerBinary {            path,            arguments: Vec::new(),            env: None,        })    }     async fn fetch_server_binary(        &self,        version: GitHubLspBinaryVersion,        container_dir: PathBuf,        delegate: &dyn LspAdapterDelegate,    ) -> Result<LanguageServerBinary> {        ensure_arch_compatibility()?;         let GitHubLspBinaryVersion {            name,            url,            digest: expected_digest,        } = version;        let version_dir = container_dir.join(format!("clangd_{name}"));        let binary_path = version_dir.join("bin/clangd");         let binary = LanguageServerBinary {            path: binary_path.clone(),            env: None,            arguments: Default::default(),        };         let metadata_path = version_dir.join("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: binary_path.clone(),                        arguments: vec!["--version".into()],                        env: None,                    })                    .await                    .inspect_err(|err| {                        log::warn!("Unable to run {binary_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 {binary_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.http_client(),            &url,            expected_digest.as_deref(),            &container_dir,            AssetKind::Zip,        )        .await?;        remove_matching(&container_dir, |entry| entry != version_dir).await;        GithubBinaryMetadata::write_to_file(            &GithubBinaryMetadata {                metadata_version: 1,                digest: expected_digest,            },            &metadata_path,        )        .await?;         Ok(binary)    }     async fn cached_server_binary(        &self,        container_dir: PathBuf,        _: &dyn LspAdapterDelegate,    ) -> Option<LanguageServerBinary> {        get_cached_server_binary(container_dir).await    }} fn ensure_arch_compatibility() -> Result<()> {    let arch = consts::ARCH;    if consts::OS == "linux" && !["x86_64", "x86"].contains(&arch) {        anyhow::bail!(            "Clangd does not provide prebuilt binaries for {arch} to fetch from GitHub. Consider installing the binary manually."        )    }    Ok(())} #[async_trait(?Send)]impl super::LspAdapter for CLspAdapter {    fn name(&self) -> LanguageServerName {        Self::SERVER_NAME    }     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 mut label = completion            .label            .strip_prefix('•')            .unwrap_or(&completion.label)            .trim()            .to_owned();         if !label_detail.is_empty() {            let should_add_space = match completion.kind {                Some(lsp::CompletionItemKind::FUNCTION | lsp::CompletionItemKind::METHOD) => false,                _ => true,            };             if should_add_space && !label.ends_with(' ') && !label_detail.starts_with(' ') {                label.push(' ');            }            label.push_str(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());                let filter_range = completion                    .filter_text                    .as_deref()                    .and_then(|filter_text| {                        text.find(filter_text)                            .map(|start| start..start + filter_text.len())                    })                    .unwrap_or(detail.len() + 1..text.len());                return Some(CodeLabel::new(text, filter_range, 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());                let filter_range = completion                    .filter_text                    .as_deref()                    .and_then(|filter_text| {                        text.find(filter_text)                            .map(|start| start..start + filter_text.len())                    })                    .unwrap_or(detail.len() + 1..text.len());                return Some(CodeLabel::new(text, filter_range, 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_range = completion                    .filter_text                    .as_deref()                    .and_then(|filter_text| {                        text.find(filter_text)                            .map(|start| start..start + filter_text.len())                    })                    .unwrap_or_else(|| {                        let filter_start = detail.len() + 1;                        let filter_end = text                            .rfind('(')                            .filter(|end| *end > filter_start)                            .unwrap_or(text.len());                        filter_start..filter_end                    });                 return Some(CodeLabel::new(text, filter_range, 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, completion.filter_text.as_deref());                    label.runs.push((                        0..label.text.rfind('(').unwrap_or(label.text.len()),                        highlight_id,                    ));                    return Some(label);                }            }            _ => {}        }        Some(CodeLabel::plain(label, completion.filter_text.as_deref()))    }     async fn label_for_symbol(        &self,        symbol: &language::Symbol,        language: &Arc<Language>,    ) -> Option<CodeLabel> {        let name = &symbol.name;        let (text, filter_range, display_range) = match symbol.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::new(            text[display_range.clone()].to_string(),            filter_range,            language.highlight_text(&text.as_str().into(), display_range),        ))    }     fn prepare_initialize_params(        &self,        mut original: InitializeParams,        _: &App,    ) -> Result<InitializeParams> {        let experimental = json!({            "textDocument": {                "completion" : {                    // enable clangd's dot-to-arrow feature.                    "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)    }     fn retain_old_diagnostic(&self, previous_diagnostic: &Diagnostic) -> bool {        clangd_ext::is_inactive_region(previous_diagnostic)    }     fn underline_diagnostic(&self, diagnostic: &lsp::Diagnostic) -> bool {        !clangd_ext::is_lsp_inactive_region(diagnostic)    }} 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.context("no cached binary")?;        let clangd_bin = clangd_dir.join("bin/clangd");        anyhow::ensure!(            clangd_bin.exists(),            "missing clangd binary in directory {clangd_dir:?}"        );        Ok(LanguageServerBinary {            path: clangd_bin,            env: None,            arguments: Vec::new(),        })    })    .await    .log_err()} #[cfg(test)]mod tests {    use gpui::{AppContext as _, BorrowAppContext, TestAppContext};    use language::{AutoindentMode, Buffer};    use settings::SettingsStore;    use std::num::NonZeroU32;    use unindent::Unindent;     #[gpui::test]    async fn test_c_autoindent_basic(cx: &mut TestAppContext) {        cx.update(|cx| {            let test_settings = SettingsStore::test(cx);            cx.set_global(test_settings);            cx.update_global::<SettingsStore, _>(|store, cx| {                store.update_user_settings(cx, |s| {                    s.project.all_languages.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);             buffer.edit([(0..0, "int main() {}")], None, cx);             let ix = buffer.len() - 1;            buffer.edit([(ix..ix, "\n\n")], Some(AutoindentMode::EachLine), cx);            assert_eq!(                buffer.text(),                "int main() {\n  \n}",                "content inside braces should be indented"            );             buffer        });    }     #[gpui::test]    async fn test_c_autoindent_if_else(cx: &mut TestAppContext) {        cx.update(|cx| {            let test_settings = SettingsStore::test(cx);            cx.set_global(test_settings);            cx.update_global::<SettingsStore, _>(|store, cx| {                store.update_user_settings(cx, |s| {                    s.project.all_languages.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);             buffer.edit(                [(                    0..0,                    r#"                    int main() {                    if (a)                    b;                    }                    "#                    .unindent(),                )],                Some(AutoindentMode::EachLine),                cx,            );            assert_eq!(                buffer.text(),                r#"                int main() {                  if (a)                    b;                }                "#                .unindent(),                "body of if-statement without braces should be indented"            );             let ix = buffer.len() - 4;            buffer.edit([(ix..ix, "\n.c")], Some(AutoindentMode::EachLine), cx);            assert_eq!(                buffer.text(),                r#"                int main() {                  if (a)                    b                      .c;                }                "#                .unindent(),                "field expression (.c) should be indented further than the statement body"            ); 

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