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 T::enabled_for_all() {
23 return true;
24 }
25
26 if self.staff && T::enabled_for_staff() {
27 return true;
28 }
29
30 self.flags.iter().any(|f| f.as_str() == T::NAME)
31 }
32}
33
34impl Global for FeatureFlags {}
35
36/// To create a feature flag, implement this trait on a trivial type and use it as
37/// a generic parameter when called [`FeatureFlagAppExt::has_flag`].
38///
39/// Feature flags are enabled for members of Zed staff by default. To disable this behavior
40/// so you can test flags being disabled, set ZED_DISABLE_STAFF=1 in your environment,
41/// which will force Zed to treat the current user as non-staff.
42pub trait FeatureFlag {
43 const NAME: &'static str;
44
45 /// Returns whether this feature flag is enabled for Zed staff.
46 fn enabled_for_staff() -> bool {
47 true
48 }
49
50 /// Returns whether this feature flag is enabled for everyone.
51 ///
52 /// This is generally done on the server, but we provide this as a way to entirely enable a feature flag client-side
53 /// without needing to remove all of the call sites.
54 fn enabled_for_all() -> bool {
55 false
56 }
57}
58
59pub struct PredictEditsRateCompletionsFeatureFlag;
60impl FeatureFlag for PredictEditsRateCompletionsFeatureFlag {
61 const NAME: &'static str = "predict-edits-rate-completions";
62}
63
64pub struct LlmClosedBetaFeatureFlag {}
65impl FeatureFlag for LlmClosedBetaFeatureFlag {
66 const NAME: &'static str = "llm-closed-beta";
67}
68
69pub struct ZedProFeatureFlag {}
70impl FeatureFlag for ZedProFeatureFlag {
71 const NAME: &'static str = "zed-pro";
72}
73
74pub struct NotebookFeatureFlag;
75
76impl FeatureFlag for NotebookFeatureFlag {
77 const NAME: &'static str = "notebooks";
78}
79
80pub struct ThreadAutoCaptureFeatureFlag {}
81impl FeatureFlag for ThreadAutoCaptureFeatureFlag {
82 const NAME: &'static str = "thread-auto-capture";
83
84 fn enabled_for_staff() -> bool {
85 false
86 }
87}
88pub struct PanicFeatureFlag;
89
90impl FeatureFlag for PanicFeatureFlag {
91 const NAME: &'static str = "panic";
92}
93
94pub struct JjUiFeatureFlag {}
95
96impl FeatureFlag for JjUiFeatureFlag {
97 const NAME: &'static str = "jj-ui";
98}
99
100pub struct AcpFeatureFlag;
101
102impl FeatureFlag for AcpFeatureFlag {
103 const NAME: &'static str = "acp";
104}
105
106pub trait FeatureFlagViewExt<V: 'static> {
107 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
108 where
109 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static;
110
111 fn when_flag_enabled<T: FeatureFlag>(
112 &mut self,
113 window: &mut Window,
114 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
115 );
116}
117
118impl<V> FeatureFlagViewExt<V> for Context<'_, V>
119where
120 V: 'static,
121{
122 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
123 where
124 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + 'static,
125 {
126 self.observe_global_in::<FeatureFlags>(window, move |v, window, cx| {
127 let feature_flags = cx.global::<FeatureFlags>();
128 callback(feature_flags.has_flag::<T>(), v, window, cx);
129 })
130 }
131
132 fn when_flag_enabled<T: FeatureFlag>(
133 &mut self,
134 window: &mut Window,
135 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
136 ) {
137 if self
138 .try_global::<FeatureFlags>()
139 .is_some_and(|f| f.has_flag::<T>())
140 {
141 self.defer_in(window, move |view, window, cx| {
142 callback(view, window, cx);
143 });
144 return;
145 }
146 let subscription = Rc::new(RefCell::new(None));
147 let inner = self.observe_global_in::<FeatureFlags>(window, {
148 let subscription = subscription.clone();
149 move |v, window, cx| {
150 let feature_flags = cx.global::<FeatureFlags>();
151 if feature_flags.has_flag::<T>() {
152 callback(v, window, cx);
153 subscription.take();
154 }
155 }
156 });
157 subscription.borrow_mut().replace(inner);
158 }
159}
160
161pub trait FeatureFlagAppExt {
162 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
163
164 /// Waits for the specified feature flag to resolve, up to the given timeout.
165 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool>;
166
167 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
168 fn set_staff(&mut self, staff: bool);
169 fn has_flag<T: FeatureFlag>(&self) -> bool;
170 fn is_staff(&self) -> bool;
171
172 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
173 where
174 F: FnMut(bool, &mut App) + 'static;
175}
176
177impl FeatureFlagAppExt for App {
178 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
179 let feature_flags = self.default_global::<FeatureFlags>();
180 feature_flags.staff = staff;
181 feature_flags.flags = flags;
182 }
183
184 fn set_staff(&mut self, staff: bool) {
185 let feature_flags = self.default_global::<FeatureFlags>();
186 feature_flags.staff = staff;
187 }
188
189 fn has_flag<T: FeatureFlag>(&self) -> bool {
190 self.try_global::<FeatureFlags>()
191 .map(|flags| flags.has_flag::<T>())
192 .unwrap_or(false)
193 }
194
195 fn is_staff(&self) -> bool {
196 self.try_global::<FeatureFlags>()
197 .map(|flags| flags.staff)
198 .unwrap_or(false)
199 }
200
201 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
202 where
203 F: FnMut(bool, &mut App) + 'static,
204 {
205 self.observe_global::<FeatureFlags>(move |cx| {
206 let feature_flags = cx.global::<FeatureFlags>();
207 callback(feature_flags.has_flag::<T>(), cx);
208 })
209 }
210
211 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
212 let (tx, rx) = oneshot::channel::<bool>();
213 let mut tx = Some(tx);
214 let subscription: Option<Subscription>;
215
216 match self.try_global::<FeatureFlags>() {
217 Some(feature_flags) => {
218 subscription = None;
219 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
220 }
221 None => {
222 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
223 let feature_flags = cx.global::<FeatureFlags>();
224 if let Some(tx) = tx.take() {
225 tx.send(feature_flags.has_flag::<T>()).ok();
226 }
227 }));
228 }
229 }
230
231 WaitForFlag(rx, subscription)
232 }
233
234 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool> {
235 let wait_for_flag = self.wait_for_flag::<T>();
236
237 self.spawn(async move |_cx| {
238 let mut wait_for_flag = wait_for_flag.fuse();
239 let mut timeout = FutureExt::fuse(smol::Timer::after(timeout));
240
241 select_biased! {
242 is_enabled = wait_for_flag => is_enabled,
243 _ = timeout => false,
244 }
245 })
246 }
247}
248
249pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
250
251impl Future for WaitForFlag {
252 type Output = bool;
253
254 fn poll(mut self: Pin<&mut Self>, cx: &mut core::task::Context<'_>) -> Poll<Self::Output> {
255 self.0.poll_unpin(cx).map(|result| {
256 self.1.take();
257 result.unwrap_or(false)
258 })
259 }
260}