use std::fs; use zed::lsp::{Completion, CompletionKind, Symbol, SymbolKind};use zed::settings::LspSettings;use zed::{serde_json, CodeLabel, CodeLabelSpan, LanguageServerId};use zed_extension_api::{self as zed, Result}; pub struct ElixirLs {    cached_binary_path: Option<String>,} impl ElixirLs {    pub const LANGUAGE_SERVER_ID: &'static str = "elixir-ls";     pub fn new() -> Self {        Self {            cached_binary_path: None,        }    }     pub fn language_server_binary_path(        &mut self,        language_server_id: &LanguageServerId,        worktree: &zed::Worktree,    ) -> Result<String> {        if let Some(path) = worktree.which("elixir-ls") {            return Ok(path);        }         if let Some(path) = &self.cached_binary_path {            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {                return Ok(path.clone());            }        }         zed::set_language_server_installation_status(            language_server_id,            &zed::LanguageServerInstallationStatus::CheckingForUpdate,        );        let release = zed::latest_github_release(            "elixir-lsp/elixir-ls",            zed::GithubReleaseOptions {                require_assets: true,                pre_release: false,            },        )?;         let asset_name = format!("elixir-ls-{version}.zip", version = release.version,);         let asset = release            .assets            .iter()            .find(|asset| asset.name == asset_name)            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;         let (platform, _arch) = zed::current_platform();        let version_dir = format!("elixir-ls-{}", release.version);        let extension = match platform {            zed::Os::Mac | zed::Os::Linux => "sh",            zed::Os::Windows => "bat",        };        let binary_path = format!("{version_dir}/language_server.{extension}");         if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {            zed::set_language_server_installation_status(                language_server_id,                &zed::LanguageServerInstallationStatus::Downloading,            );             zed::download_file(                &asset.download_url,                &version_dir,                zed::DownloadedFileType::Zip,            )            .map_err(|e| format!("failed to download file: {e}"))?;             zed::make_file_executable(&binary_path)?;            zed::make_file_executable(&format!("{version_dir}/launch.{extension}"))?;            zed::make_file_executable(&format!("{version_dir}/debug_adapter.{extension}"))?;             let entries =                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;            for entry in entries {                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;                if entry.file_name().to_str() != Some(&version_dir) {                    fs::remove_dir_all(entry.path()).ok();                }            }        }         self.cached_binary_path = Some(binary_path.clone());        Ok(binary_path)    }     pub fn language_server_workspace_configuration(        &mut self,        worktree: &zed::Worktree,    ) -> Result<Option<serde_json::Value>> {        let settings = LspSettings::for_worktree("elixir-ls", worktree)            .ok()            .and_then(|lsp_settings| lsp_settings.settings.clone())            .unwrap_or_default();         Ok(Some(serde_json::json!({            "elixirLS": settings        })))    }     pub fn label_for_completion(&self, completion: Completion) -> Option<CodeLabel> {        match completion.kind? {            CompletionKind::Module            | CompletionKind::Class            | CompletionKind::Interface            | CompletionKind::Struct => {                let name = completion.label;                let defmodule = "defmodule ";                let code = format!("{defmodule}{name}");                 Some(CodeLabel {                    code,                    spans: vec![CodeLabelSpan::code_range(                        defmodule.len()..defmodule.len() + name.len(),                    )],                    filter_range: (0..name.len()).into(),                })            }            CompletionKind::Function | CompletionKind::Constant => {                let name = completion.label;                let def = "def ";                let code = format!("{def}{name}");                 Some(CodeLabel {                    code,                    spans: vec![CodeLabelSpan::code_range(def.len()..def.len() + name.len())],                    filter_range: (0..name.len()).into(),                })            }            CompletionKind::Operator => {                let name = completion.label;                let def_a = "def a ";                let code = format!("{def_a}{name} b");                 Some(CodeLabel {                    code,                    spans: vec![CodeLabelSpan::code_range(                        def_a.len()..def_a.len() + name.len(),                    )],                    filter_range: (0..name.len()).into(),                })            }            _ => None,        }    }     pub fn label_for_symbol(&self, symbol: Symbol) -> Option<CodeLabel> {        let name = &symbol.name;         let (code, filter_range, display_range) = match symbol.kind {            SymbolKind::Module | SymbolKind::Class | SymbolKind::Interface | SymbolKind::Struct => {                let defmodule = "defmodule ";                let code = format!("{defmodule}{name}");                let filter_range = 0..name.len();                let display_range = defmodule.len()..defmodule.len() + name.len();                (code, filter_range, display_range)            }            SymbolKind::Function | SymbolKind::Constant => {                let def = "def ";                let code = format!("{def}{name}");                let filter_range = 0..name.len();                let display_range = def.len()..def.len() + name.len();                (code, filter_range, display_range)            }            _ => return None,        };         Some(CodeLabel {            spans: vec![CodeLabelSpan::code_range(display_range)],            filter_range: filter_range.into(),            code,        })    }}