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 Debugger {}
105impl FeatureFlag for Debugger {
106 const NAME: &'static str = "debugger";
107}
108
109pub trait FeatureFlagViewExt<V: 'static> {
110 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
111 where
112 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static;
113
114 fn when_flag_enabled<T: FeatureFlag>(
115 &mut self,
116 window: &mut Window,
117 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
118 );
119}
120
121impl<V> FeatureFlagViewExt<V> for Context<'_, V>
122where
123 V: 'static,
124{
125 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
126 where
127 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + 'static,
128 {
129 self.observe_global_in::<FeatureFlags>(window, move |v, window, cx| {
130 let feature_flags = cx.global::<FeatureFlags>();
131 callback(feature_flags.has_flag::<T>(), v, window, cx);
132 })
133 }
134
135 fn when_flag_enabled<T: FeatureFlag>(
136 &mut self,
137 window: &mut Window,
138 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
139 ) {
140 if self
141 .try_global::<FeatureFlags>()
142 .is_some_and(|f| f.has_flag::<T>())
143 || cfg!(debug_assertions) && T::enabled_in_development()
144 {
145 self.defer_in(window, move |view, window, cx| {
146 callback(view, window, cx);
147 });
148 return;
149 }
150 let subscription = Rc::new(RefCell::new(None));
151 let inner = self.observe_global_in::<FeatureFlags>(window, {
152 let subscription = subscription.clone();
153 move |v, window, cx| {
154 let feature_flags = cx.global::<FeatureFlags>();
155 if feature_flags.has_flag::<T>() {
156 callback(v, window, cx);
157 subscription.take();
158 }
159 }
160 });
161 subscription.borrow_mut().replace(inner);
162 }
163}
164
165pub trait FeatureFlagAppExt {
166 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
167
168 /// Waits for the specified feature flag to resolve, up to the given timeout.
169 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool>;
170
171 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
172 fn set_staff(&mut self, staff: bool);
173 fn has_flag<T: FeatureFlag>(&self) -> bool;
174 fn is_staff(&self) -> bool;
175
176 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
177 where
178 F: FnMut(bool, &mut App) + 'static;
179}
180
181impl FeatureFlagAppExt for App {
182 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
183 let feature_flags = self.default_global::<FeatureFlags>();
184 feature_flags.staff = staff;
185 feature_flags.flags = flags;
186 }
187
188 fn set_staff(&mut self, staff: bool) {
189 let feature_flags = self.default_global::<FeatureFlags>();
190 feature_flags.staff = staff;
191 }
192
193 fn has_flag<T: FeatureFlag>(&self) -> bool {
194 self.try_global::<FeatureFlags>()
195 .map(|flags| flags.has_flag::<T>())
196 .unwrap_or(false)
197 }
198
199 fn is_staff(&self) -> bool {
200 self.try_global::<FeatureFlags>()
201 .map(|flags| flags.staff)
202 .unwrap_or(false)
203 }
204
205 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
206 where
207 F: FnMut(bool, &mut App) + 'static,
208 {
209 self.observe_global::<FeatureFlags>(move |cx| {
210 let feature_flags = cx.global::<FeatureFlags>();
211 callback(feature_flags.has_flag::<T>(), cx);
212 })
213 }
214
215 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
216 let (tx, rx) = oneshot::channel::<bool>();
217 let mut tx = Some(tx);
218 let subscription: Option<Subscription>;
219
220 match self.try_global::<FeatureFlags>() {
221 Some(feature_flags) => {
222 subscription = None;
223 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
224 }
225 None => {
226 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
227 let feature_flags = cx.global::<FeatureFlags>();
228 if let Some(tx) = tx.take() {
229 tx.send(feature_flags.has_flag::<T>()).ok();
230 }
231 }));
232 }
233 }
234
235 WaitForFlag(rx, subscription)
236 }
237
238 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool> {
239 let wait_for_flag = self.wait_for_flag::<T>();
240
241 self.spawn(async move |_cx| {
242 let mut wait_for_flag = wait_for_flag.fuse();
243 let mut timeout = FutureExt::fuse(smol::Timer::after(timeout));
244
245 select_biased! {
246 is_enabled = wait_for_flag => is_enabled,
247 _ = timeout => false,
248 }
249 })
250 }
251}
252
253pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
254
255impl Future for WaitForFlag {
256 type Output = bool;
257
258 fn poll(mut self: Pin<&mut Self>, cx: &mut core::task::Context<'_>) -> Poll<Self::Output> {
259 self.0.poll_unpin(cx).map(|result| {
260 self.1.take();
261 result.unwrap_or(false)
262 })
263 }
264}