1use futures::channel::oneshot;
2use futures::{select_biased, FutureExt};
3use gpui::{App, Context, Global, Subscription, Task, Window};
4use std::cell::RefCell;
5use std::rc::Rc;
6use std::sync::LazyLock;
7use std::time::Duration;
8use std::{future::Future, pin::Pin, task::Poll};
9
10#[derive(Default)]
11struct FeatureFlags {
12 flags: Vec<String>,
13 staff: bool,
14}
15
16pub static ZED_DISABLE_STAFF: LazyLock<bool> = LazyLock::new(|| {
17 std::env::var("ZED_DISABLE_STAFF").map_or(false, |value| !value.is_empty() && value != "0")
18});
19
20impl FeatureFlags {
21 fn has_flag<T: FeatureFlag>(&self) -> bool {
22 if self.staff && T::enabled_for_staff() {
23 return true;
24 }
25
26 #[cfg(debug_assertions)]
27 if T::enabled_in_development() {
28 return true;
29 }
30
31 self.flags.iter().any(|f| f.as_str() == T::NAME)
32 }
33}
34
35impl Global for FeatureFlags {}
36
37/// To create a feature flag, implement this trait on a trivial type and use it as
38/// a generic parameter when called [`FeatureFlagAppExt::has_flag`].
39///
40/// Feature flags are enabled for members of Zed staff by default. To disable this behavior
41/// so you can test flags being disabled, set ZED_DISABLE_STAFF=1 in your environment,
42/// which will force Zed to treat the current user as non-staff.
43pub trait FeatureFlag {
44 const NAME: &'static str;
45
46 /// Returns whether this feature flag is enabled for Zed staff.
47 fn enabled_for_staff() -> bool {
48 true
49 }
50
51 fn enabled_in_development() -> bool {
52 Self::enabled_for_staff() && !*ZED_DISABLE_STAFF
53 }
54}
55
56pub struct Assistant2FeatureFlag;
57
58impl FeatureFlag for Assistant2FeatureFlag {
59 const NAME: &'static str = "assistant2";
60}
61
62pub struct PredictEditsRateCompletionsFeatureFlag;
63impl FeatureFlag for PredictEditsRateCompletionsFeatureFlag {
64 const NAME: &'static str = "predict-edits-rate-completions";
65}
66
67/// A feature flag that controls whether "non eager mode" (holding `alt` to preview) is publicized.
68pub struct PredictEditsNonEagerModeFeatureFlag;
69impl FeatureFlag for PredictEditsNonEagerModeFeatureFlag {
70 const NAME: &'static str = "predict-edits-non-eager-mode";
71
72 fn enabled_for_staff() -> bool {
73 // Don't show to staff so it doesn't leak into media for the launch.
74 false
75 }
76}
77
78pub struct Remoting {}
79impl FeatureFlag for Remoting {
80 const NAME: &'static str = "remoting";
81}
82
83pub struct LanguageModels {}
84impl FeatureFlag for LanguageModels {
85 const NAME: &'static str = "language-models";
86}
87
88pub struct LlmClosedBeta {}
89impl FeatureFlag for LlmClosedBeta {
90 const NAME: &'static str = "llm-closed-beta";
91}
92
93pub struct ZedPro {}
94impl FeatureFlag for ZedPro {
95 const NAME: &'static str = "zed-pro";
96}
97
98pub struct NotebookFeatureFlag;
99
100impl FeatureFlag for NotebookFeatureFlag {
101 const NAME: &'static str = "notebooks";
102}
103
104pub struct AutoCommand {}
105impl FeatureFlag for AutoCommand {
106 const NAME: &'static str = "auto-command";
107
108 fn enabled_for_staff() -> bool {
109 false
110 }
111}
112
113pub struct Debugger {}
114impl FeatureFlag for Debugger {
115 const NAME: &'static str = "debugger";
116}
117
118pub trait FeatureFlagViewExt<V: 'static> {
119 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
120 where
121 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static;
122
123 fn when_flag_enabled<T: FeatureFlag>(
124 &mut self,
125 window: &mut Window,
126 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
127 );
128}
129
130impl<V> FeatureFlagViewExt<V> for Context<'_, V>
131where
132 V: 'static,
133{
134 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
135 where
136 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + 'static,
137 {
138 self.observe_global_in::<FeatureFlags>(window, move |v, window, cx| {
139 let feature_flags = cx.global::<FeatureFlags>();
140 callback(feature_flags.has_flag::<T>(), v, window, cx);
141 })
142 }
143
144 fn when_flag_enabled<T: FeatureFlag>(
145 &mut self,
146 window: &mut Window,
147 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
148 ) {
149 if self
150 .try_global::<FeatureFlags>()
151 .is_some_and(|f| f.has_flag::<T>())
152 || cfg!(debug_assertions) && T::enabled_in_development()
153 {
154 self.defer_in(window, move |view, window, cx| {
155 callback(view, window, cx);
156 });
157 return;
158 }
159 let subscription = Rc::new(RefCell::new(None));
160 let inner = self.observe_global_in::<FeatureFlags>(window, {
161 let subscription = subscription.clone();
162 move |v, window, cx| {
163 let feature_flags = cx.global::<FeatureFlags>();
164 if feature_flags.has_flag::<T>() {
165 callback(v, window, cx);
166 subscription.take();
167 }
168 }
169 });
170 subscription.borrow_mut().replace(inner);
171 }
172}
173
174pub trait FeatureFlagAppExt {
175 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
176
177 /// Waits for the specified feature flag to resolve, up to the given timeout.
178 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool>;
179
180 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
181 fn set_staff(&mut self, staff: bool);
182 fn has_flag<T: FeatureFlag>(&self) -> bool;
183 fn is_staff(&self) -> bool;
184
185 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
186 where
187 F: FnMut(bool, &mut App) + 'static;
188}
189
190impl FeatureFlagAppExt for App {
191 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
192 let feature_flags = self.default_global::<FeatureFlags>();
193 feature_flags.staff = staff;
194 feature_flags.flags = flags;
195 }
196
197 fn set_staff(&mut self, staff: bool) {
198 let feature_flags = self.default_global::<FeatureFlags>();
199 feature_flags.staff = staff;
200 }
201
202 fn has_flag<T: FeatureFlag>(&self) -> bool {
203 self.try_global::<FeatureFlags>()
204 .map(|flags| flags.has_flag::<T>())
205 .unwrap_or(false)
206 }
207
208 fn is_staff(&self) -> bool {
209 self.try_global::<FeatureFlags>()
210 .map(|flags| flags.staff)
211 .unwrap_or(false)
212 }
213
214 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
215 where
216 F: FnMut(bool, &mut App) + 'static,
217 {
218 self.observe_global::<FeatureFlags>(move |cx| {
219 let feature_flags = cx.global::<FeatureFlags>();
220 callback(feature_flags.has_flag::<T>(), cx);
221 })
222 }
223
224 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
225 let (tx, rx) = oneshot::channel::<bool>();
226 let mut tx = Some(tx);
227 let subscription: Option<Subscription>;
228
229 match self.try_global::<FeatureFlags>() {
230 Some(feature_flags) => {
231 subscription = None;
232 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
233 }
234 None => {
235 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
236 let feature_flags = cx.global::<FeatureFlags>();
237 if let Some(tx) = tx.take() {
238 tx.send(feature_flags.has_flag::<T>()).ok();
239 }
240 }));
241 }
242 }
243
244 WaitForFlag(rx, subscription)
245 }
246
247 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool> {
248 let wait_for_flag = self.wait_for_flag::<T>();
249
250 self.spawn(async move |_cx| {
251 let mut wait_for_flag = wait_for_flag.fuse();
252 let mut timeout = FutureExt::fuse(smol::Timer::after(timeout));
253
254 select_biased! {
255 is_enabled = wait_for_flag => is_enabled,
256 _ = timeout => false,
257 }
258 })
259 }
260}
261
262pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
263
264impl Future for WaitForFlag {
265 type Output = bool;
266
267 fn poll(mut self: Pin<&mut Self>, cx: &mut core::task::Context<'_>) -> Poll<Self::Output> {
268 self.0.poll_unpin(cx).map(|result| {
269 self.1.take();
270 result.unwrap_or(false)
271 })
272 }
273}