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