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