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}
88
89pub struct JjUiFeatureFlag {}
90
91impl FeatureFlag for JjUiFeatureFlag {
92 const NAME: &'static str = "jj-ui";
93}
94
95pub struct AcpFeatureFlag;
96
97impl FeatureFlag for AcpFeatureFlag {
98 const NAME: &'static str = "acp";
99}
100
101pub struct ZedCloudFeatureFlag {}
102
103impl FeatureFlag for ZedCloudFeatureFlag {
104 const NAME: &'static str = "zed-cloud";
105
106 fn enabled_for_staff() -> bool {
107 // Require individual opt-in, for now.
108 false
109 }
110}
111
112pub trait FeatureFlagViewExt<V: 'static> {
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>) + Send + Sync + 'static;
116
117 fn when_flag_enabled<T: FeatureFlag>(
118 &mut self,
119 window: &mut Window,
120 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
121 );
122}
123
124impl<V> FeatureFlagViewExt<V> for Context<'_, V>
125where
126 V: 'static,
127{
128 fn observe_flag<T: FeatureFlag, F>(&mut self, window: &Window, callback: F) -> Subscription
129 where
130 F: Fn(bool, &mut V, &mut Window, &mut Context<V>) + 'static,
131 {
132 self.observe_global_in::<FeatureFlags>(window, move |v, window, cx| {
133 let feature_flags = cx.global::<FeatureFlags>();
134 callback(feature_flags.has_flag::<T>(), v, window, cx);
135 })
136 }
137
138 fn when_flag_enabled<T: FeatureFlag>(
139 &mut self,
140 window: &mut Window,
141 callback: impl Fn(&mut V, &mut Window, &mut Context<V>) + Send + Sync + 'static,
142 ) {
143 if self
144 .try_global::<FeatureFlags>()
145 .is_some_and(|f| f.has_flag::<T>())
146 {
147 self.defer_in(window, move |view, window, cx| {
148 callback(view, window, cx);
149 });
150 return;
151 }
152 let subscription = Rc::new(RefCell::new(None));
153 let inner = self.observe_global_in::<FeatureFlags>(window, {
154 let subscription = subscription.clone();
155 move |v, window, cx| {
156 let feature_flags = cx.global::<FeatureFlags>();
157 if feature_flags.has_flag::<T>() {
158 callback(v, window, cx);
159 subscription.take();
160 }
161 }
162 });
163 subscription.borrow_mut().replace(inner);
164 }
165}
166
167pub trait FeatureFlagAppExt {
168 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
169
170 /// Waits for the specified feature flag to resolve, up to the given timeout.
171 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool>;
172
173 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
174 fn set_staff(&mut self, staff: bool);
175 fn has_flag<T: FeatureFlag>(&self) -> bool;
176 fn is_staff(&self) -> bool;
177
178 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
179 where
180 F: FnMut(bool, &mut App) + 'static;
181}
182
183impl FeatureFlagAppExt for App {
184 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
185 let feature_flags = self.default_global::<FeatureFlags>();
186 feature_flags.staff = staff;
187 feature_flags.flags = flags;
188 }
189
190 fn set_staff(&mut self, staff: bool) {
191 let feature_flags = self.default_global::<FeatureFlags>();
192 feature_flags.staff = staff;
193 }
194
195 fn has_flag<T: FeatureFlag>(&self) -> bool {
196 self.try_global::<FeatureFlags>()
197 .map(|flags| flags.has_flag::<T>())
198 .unwrap_or(false)
199 }
200
201 fn is_staff(&self) -> bool {
202 self.try_global::<FeatureFlags>()
203 .map(|flags| flags.staff)
204 .unwrap_or(false)
205 }
206
207 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
208 where
209 F: FnMut(bool, &mut App) + 'static,
210 {
211 self.observe_global::<FeatureFlags>(move |cx| {
212 let feature_flags = cx.global::<FeatureFlags>();
213 callback(feature_flags.has_flag::<T>(), cx);
214 })
215 }
216
217 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
218 let (tx, rx) = oneshot::channel::<bool>();
219 let mut tx = Some(tx);
220 let subscription: Option<Subscription>;
221
222 match self.try_global::<FeatureFlags>() {
223 Some(feature_flags) => {
224 subscription = None;
225 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
226 }
227 None => {
228 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
229 let feature_flags = cx.global::<FeatureFlags>();
230 if let Some(tx) = tx.take() {
231 tx.send(feature_flags.has_flag::<T>()).ok();
232 }
233 }));
234 }
235 }
236
237 WaitForFlag(rx, subscription)
238 }
239
240 fn wait_for_flag_or_timeout<T: FeatureFlag>(&mut self, timeout: Duration) -> Task<bool> {
241 let wait_for_flag = self.wait_for_flag::<T>();
242
243 self.spawn(async move |_cx| {
244 let mut wait_for_flag = wait_for_flag.fuse();
245 let mut timeout = FutureExt::fuse(smol::Timer::after(timeout));
246
247 select_biased! {
248 is_enabled = wait_for_flag => is_enabled,
249 _ = timeout => false,
250 }
251 })
252 }
253}
254
255pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
256
257impl Future for WaitForFlag {
258 type Output = bool;
259
260 fn poll(mut self: Pin<&mut Self>, cx: &mut core::task::Context<'_>) -> Poll<Self::Output> {
261 self.0.poll_unpin(cx).map(|result| {
262 self.1.take();
263 result.unwrap_or(false)
264 })
265 }
266}