1use futures::channel::oneshot;
2use futures::{FutureExt, select_biased};
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
67pub struct LanguageModelsFeatureFlag {}
68impl FeatureFlag for LanguageModelsFeatureFlag {
69 const NAME: &'static str = "language-models";
70}
71
72pub struct LlmClosedBetaFeatureFlag {}
73impl FeatureFlag for LlmClosedBetaFeatureFlag {
74 const NAME: &'static str = "llm-closed-beta";
75}
76
77pub struct ZedProFeatureFlag {}
78impl FeatureFlag for ZedProFeatureFlag {
79 const NAME: &'static str = "zed-pro";
80}
81
82pub struct NotebookFeatureFlag;
83
84impl FeatureFlag for NotebookFeatureFlag {
85 const NAME: &'static str = "notebooks";
86}
87
88pub struct DebuggerFeatureFlag {}
89impl FeatureFlag for DebuggerFeatureFlag {
90 const NAME: &'static str = "debugger";
91}
92
93pub struct ThreadAutoCaptureFeatureFlag {}
94impl FeatureFlag for ThreadAutoCaptureFeatureFlag {
95 const NAME: &'static str = "thread-auto-capture";
96
97 fn enabled_for_staff() -> bool {
98 false
99 }
100}
101
102pub trait FeatureFlagViewExt<V: 'static> {
103 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
104 where
105 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static;
106
107 fn when_flag_enabled<T: FeatureFlag>(
108 &mut self,
109 window: &mut Window,
110 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
111 );
112}
113
114impl<V> FeatureFlagViewExt<V> for Context<'_, V>
115where
116 V: 'static,
117{
118 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
119 where
120 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + 'static,
121 {
122 self.observe_global_in::<FeatureFlags>(window, move |v, window, cx| {
123 let feature_flags = cx.global::<FeatureFlags>();
124 callback(feature_flags.has_flag::<T>(), v, window, cx);
125 })
126 }
127
128 fn when_flag_enabled<T: FeatureFlag>(
129 &mut self,
130 window: &mut Window,
131 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
132 ) {
133 if self
134 .try_global::<FeatureFlags>()
135 .is_some_and(|f| f.has_flag::<T>())
136 || cfg!(debug_assertions) && T::enabled_in_development()
137 {
138 self.defer_in(window, move |view, window, cx| {
139 callback(view, window, cx);
140 });
141 return;
142 }
143 let subscription = Rc::new(RefCell::new(None));
144 let inner = self.observe_global_in::<FeatureFlags>(window, {
145 let subscription = subscription.clone();
146 move |v, window, cx| {
147 let feature_flags = cx.global::<FeatureFlags>();
148 if feature_flags.has_flag::<T>() {
149 callback(v, window, cx);
150 subscription.take();
151 }
152 }
153 });
154 subscription.borrow_mut().replace(inner);
155 }
156}
157
158pub trait FeatureFlagAppExt {
159 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
160
161 /// Waits for the specified feature flag to resolve, up to the given timeout.
162 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool>;
163
164 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
165 fn set_staff(&mut self, staff: bool);
166 fn has_flag<T: FeatureFlag>(&self) -> bool;
167 fn is_staff(&self) -> bool;
168
169 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
170 where
171 F: FnMut(bool, &mut App) + 'static;
172}
173
174impl FeatureFlagAppExt for App {
175 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
176 let feature_flags = self.default_global::<FeatureFlags>();
177 feature_flags.staff = staff;
178 feature_flags.flags = flags;
179 }
180
181 fn set_staff(&mut self, staff: bool) {
182 let feature_flags = self.default_global::<FeatureFlags>();
183 feature_flags.staff = staff;
184 }
185
186 fn has_flag<T: FeatureFlag>(&self) -> bool {
187 self.try_global::<FeatureFlags>()
188 .map(|flags| flags.has_flag::<T>())
189 .unwrap_or(false)
190 }
191
192 fn is_staff(&self) -> bool {
193 self.try_global::<FeatureFlags>()
194 .map(|flags| flags.staff)
195 .unwrap_or(false)
196 }
197
198 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
199 where
200 F: FnMut(bool, &mut App) + 'static,
201 {
202 self.observe_global::<FeatureFlags>(move |cx| {
203 let feature_flags = cx.global::<FeatureFlags>();
204 callback(feature_flags.has_flag::<T>(), cx);
205 })
206 }
207
208 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
209 let (tx, rx) = oneshot::channel::<bool>();
210 let mut tx = Some(tx);
211 let subscription: Option<Subscription>;
212
213 match self.try_global::<FeatureFlags>() {
214 Some(feature_flags) => {
215 subscription = None;
216 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
217 }
218 None => {
219 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
220 let feature_flags = cx.global::<FeatureFlags>();
221 if let Some(tx) = tx.take() {
222 tx.send(feature_flags.has_flag::<T>()).ok();
223 }
224 }));
225 }
226 }
227
228 WaitForFlag(rx, subscription)
229 }
230
231 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool> {
232 let wait_for_flag = self.wait_for_flag::<T>();
233
234 self.spawn(async move |_cx| {
235 let mut wait_for_flag = wait_for_flag.fuse();
236 let mut timeout = FutureExt::fuse(smol::Timer::after(timeout));
237
238 select_biased! {
239 is_enabled = wait_for_flag => is_enabled,
240 _ = timeout => false,
241 }
242 })
243 }
244}
245
246pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
247
248impl Future for WaitForFlag {
249 type Output = bool;
250
251 fn poll(mut self: Pin<&mut Self>, cx: &mut core::task::Context<'_>) -> Poll<Self::Output> {
252 self.0.poll_unpin(cx).map(|result| {
253 self.1.take();
254 result.unwrap_or(false)
255 })
256 }
257}