1use std::fs;
2
3use zed::lsp::{Completion, CompletionKind, Symbol, SymbolKind};
4use zed::{CodeLabel, CodeLabelSpan, LanguageServerId};
5use zed_extension_api::{self as zed, Result};
6
7pub struct NextLs {
8 cached_binary_path: Option<String>,
9}
10
11impl NextLs {
12 pub const LANGUAGE_SERVER_ID: &'static str = "next-ls";
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 "elixir-tools/next-ls",
37 zed::GithubReleaseOptions {
38 require_assets: true,
39 pre_release: false,
40 },
41 )?;
42
43 let (platform, arch) = zed::current_platform();
44 let asset_name = format!(
45 "next_ls_{os}_{arch}{extension}",
46 os = match platform {
47 zed::Os::Mac => "darwin",
48 zed::Os::Linux => "linux",
49 zed::Os::Windows => "windows",
50 },
51 arch = match arch {
52 zed::Architecture::Aarch64 => "arm64",
53 zed::Architecture::X8664 => "amd64",
54 zed::Architecture::X86 =>
55 return Err(format!("unsupported architecture: {arch:?}")),
56 },
57 extension = match platform {
58 zed::Os::Mac | zed::Os::Linux => "",
59 zed::Os::Windows => ".exe",
60 }
61 );
62
63 let asset = release
64 .assets
65 .iter()
66 .find(|asset| asset.name == asset_name)
67 .ok_or_else(|| format!("no asset found matching {:?}", asset_name))?;
68
69 let version_dir = format!("next-ls-{}", release.version);
70 fs::create_dir_all(&version_dir).map_err(|e| format!("failed to create directory: {e}"))?;
71
72 let binary_path = format!("{version_dir}/next-ls");
73
74 if !fs::metadata(&binary_path).map_or(false, |stat| stat.is_file()) {
75 zed::set_language_server_installation_status(
76 &language_server_id,
77 &zed::LanguageServerInstallationStatus::Downloading,
78 );
79
80 zed::download_file(
81 &asset.download_url,
82 &binary_path,
83 zed::DownloadedFileType::Uncompressed,
84 )
85 .map_err(|e| format!("failed to download file: {e}"))?;
86
87 zed::make_file_executable(&binary_path)?;
88
89 let entries =
90 fs::read_dir(".").map_err(|e| format!("failed to list working directory {e}"))?;
91 for entry in entries {
92 let entry = entry.map_err(|e| format!("failed to load directory entry {e}"))?;
93 if entry.file_name().to_str() != Some(&version_dir) {
94 fs::remove_dir_all(&entry.path()).ok();
95 }
96 }
97 }
98
99 self.cached_binary_path = Some(binary_path.clone());
100 Ok(binary_path)
101 }
102
103 pub fn label_for_completion(&self, completion: Completion) -> Option<CodeLabel> {
104 match completion.kind? {
105 CompletionKind::Module
106 | CompletionKind::Class
107 | CompletionKind::Interface
108 | CompletionKind::Struct => {
109 let name = completion.label;
110 let defmodule = "defmodule ";
111 let code = format!("{defmodule}{name}");
112
113 Some(CodeLabel {
114 code,
115 spans: vec![CodeLabelSpan::code_range(
116 defmodule.len()..defmodule.len() + name.len(),
117 )],
118 filter_range: (0..name.len()).into(),
119 })
120 }
121 CompletionKind::Function | CompletionKind::Constant => {
122 let name = completion.label;
123 let def = "def ";
124 let code = format!("{def}{name}");
125
126 Some(CodeLabel {
127 code,
128 spans: vec![CodeLabelSpan::code_range(def.len()..def.len() + name.len())],
129 filter_range: (0..name.len()).into(),
130 })
131 }
132 CompletionKind::Operator => {
133 let name = completion.label;
134 let def_a = "def a ";
135 let code = format!("{def_a}{name} b");
136
137 Some(CodeLabel {
138 code,
139 spans: vec![CodeLabelSpan::code_range(
140 def_a.len()..def_a.len() + name.len(),
141 )],
142 filter_range: (0..name.len()).into(),
143 })
144 }
145 _ => None,
146 }
147 }
148
149 pub fn label_for_symbol(&self, symbol: Symbol) -> Option<CodeLabel> {
150 let name = &symbol.name;
151
152 let (code, filter_range, display_range) = match symbol.kind {
153 SymbolKind::Module | SymbolKind::Class | SymbolKind::Interface | SymbolKind::Struct => {
154 let defmodule = "defmodule ";
155 let code = format!("{defmodule}{name}");
156 let filter_range = 0..name.len();
157 let display_range = defmodule.len()..defmodule.len() + name.len();
158 (code, filter_range, display_range)
159 }
160 SymbolKind::Function | SymbolKind::Constant => {
161 let def = "def ";
162 let code = format!("{def}{name}");
163 let filter_range = 0..name.len();
164 let display_range = def.len()..def.len() + name.len();
165 (code, filter_range, display_range)
166 }
167 _ => return None,
168 };
169
170 Some(CodeLabel {
171 spans: vec![CodeLabelSpan::code_range(display_range)],
172 filter_range: filter_range.into(),
173 code,
174 })
175 }
176}