1use std::fs;
  2
  3use zed::lsp::{Completion, CompletionKind, Symbol};
  4use zed::{CodeLabel, CodeLabelSpan, LanguageServerId};
  5use zed_extension_api::{self as zed, Result};
  6
  7pub struct Lexical {
  8    cached_binary_path: Option<String>,
  9}
 10
 11impl Lexical {
 12    pub const LANGUAGE_SERVER_ID: &'static str = "lexical";
 13
 14    pub fn new() -> Self {
 15        Self {
 16            cached_binary_path: None,
 17        }
 18    }
 19
 20    pub fn language_server_binary_path(
 21        &mut self,
 22        language_server_id: &LanguageServerId,
 23        worktree: &zed::Worktree,
 24    ) -> Result<String> {
 25        if let Some(path) = worktree.which("lexical") {
 26            return Ok(path);
 27        }
 28
 29        if let Some(path) = &self.cached_binary_path {
 30            if fs::metadata(path).map_or(false, |stat| stat.is_file()) {
 31                return Ok(path.clone());
 32            }
 33        }
 34
 35        zed::set_language_server_installation_status(
 36            &language_server_id,
 37            &zed::LanguageServerInstallationStatus::CheckingForUpdate,
 38        );
 39        let release = zed::latest_github_release(
 40            "lexical-lsp/lexical",
 41            zed::GithubReleaseOptions {
 42                require_assets: true,
 43                pre_release: false,
 44            },
 45        )?;
 46
 47        let asset_name = format!("lexical-{version}.zip", version = release.version);
 48
 49        let asset = release
 50            .assets
 51            .iter()
 52            .find(|asset| asset.name == asset_name)
 53            .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
 54
 55        let version_dir = format!("lexical-{}", release.version);
 56        let binary_path = format!("{version_dir}/lexical/bin/start_lexical.sh");
 57
 58        if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
 59            zed::set_language_server_installation_status(
 60                &language_server_id,
 61                &zed::LanguageServerInstallationStatus::Downloading,
 62            );
 63
 64            zed::download_file(
 65                &asset.download_url,
 66                &version_dir,
 67                zed::DownloadedFileType::Zip,
 68            )
 69            .map_err(|e| format!("failed to download file: {e}"))?;
 70
 71            let entries =
 72                fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
 73            for entry in entries {
 74                let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
 75                if entry.file_name().to_str() != Some(&version_dir) {
 76                    fs::remove_dir_all(&entry.path()).ok();
 77                }
 78            }
 79        }
 80
 81        self.cached_binary_path = Some(binary_path.clone());
 82        Ok(binary_path)
 83    }
 84
 85    pub fn label_for_completion(&self, completion: Completion) -> Option<CodeLabel> {
 86        match completion.kind? {
 87            CompletionKind::Module
 88            | CompletionKind::Class
 89            | CompletionKind::Interface
 90            | CompletionKind::Struct => {
 91                let name = completion.label;
 92                let defmodule = "defmodule ";
 93                let code = format!("{defmodule}{name}");
 94
 95                Some(CodeLabel {
 96                    code,
 97                    spans: vec![CodeLabelSpan::code_range(
 98                        defmodule.len()..defmodule.len() + name.len(),
 99                    )],
100                    filter_range: (0..name.len()).into(),
101                })
102            }
103            CompletionKind::Function | CompletionKind::Constant => {
104                let name = completion.label;
105                let def = "def ";
106                let code = format!("{def}{name}");
107
108                Some(CodeLabel {
109                    code,
110                    spans: vec![CodeLabelSpan::code_range(def.len()..def.len() + name.len())],
111                    filter_range: (0..name.len()).into(),
112                })
113            }
114            CompletionKind::Operator => {
115                let name = completion.label;
116                let def_a = "def a ";
117                let code = format!("{def_a}{name} b");
118
119                Some(CodeLabel {
120                    code,
121                    spans: vec![CodeLabelSpan::code_range(
122                        def_a.len()..def_a.len() + name.len(),
123                    )],
124                    filter_range: (0..name.len()).into(),
125                })
126            }
127            _ => None,
128        }
129    }
130
131    pub fn label_for_symbol(&self, _symbol: Symbol) -> Option<CodeLabel> {
132        None
133    }
134}