1use futures::{channel::oneshot, FutureExt as _};
2use gpui::{AppContext, Global, Subscription, ViewContext};
3use std::{
4 future::Future,
5 pin::Pin,
6 task::{Context, Poll},
7};
8
9#[derive(Default)]
10struct FeatureFlags {
11 flags: Vec<String>,
12 staff: bool,
13}
14
15impl FeatureFlags {
16 fn has_flag<T: FeatureFlag>(&self) -> bool {
17 if self.staff && T::enabled_for_staff() {
18 return true;
19 }
20
21 self.flags.iter().any(|f| f.as_str() == T::NAME)
22 }
23}
24
25impl Global for FeatureFlags {}
26
27/// To create a feature flag, implement this trait on a trivial type and use it as
28/// a generic parameter when called [`FeatureFlagAppExt::has_flag`].
29///
30/// Feature flags are enabled for members of Zed staff by default. To disable this behavior
31/// so you can test flags being disabled, set ZED_DISABLE_STAFF=1 in your environment,
32/// which will force Zed to treat the current user as non-staff.
33pub trait FeatureFlag {
34 const NAME: &'static str;
35
36 /// Returns whether this feature flag is enabled for Zed staff.
37 fn enabled_for_staff() -> bool {
38 true
39 }
40}
41
42pub struct Assistant2FeatureFlag;
43
44impl FeatureFlag for Assistant2FeatureFlag {
45 const NAME: &'static str = "assistant2";
46
47 fn enabled_for_staff() -> bool {
48 false
49 }
50}
51
52pub struct Remoting {}
53impl FeatureFlag for Remoting {
54 const NAME: &'static str = "remoting";
55}
56
57pub struct LanguageModels {}
58impl FeatureFlag for LanguageModels {
59 const NAME: &'static str = "language-models";
60}
61
62pub struct LlmClosedBeta {}
63impl FeatureFlag for LlmClosedBeta {
64 const NAME: &'static str = "llm-closed-beta";
65}
66
67pub struct ZedPro {}
68impl FeatureFlag for ZedPro {
69 const NAME: &'static str = "zed-pro";
70}
71
72pub struct NotebookFeatureFlag;
73
74impl FeatureFlag for NotebookFeatureFlag {
75 const NAME: &'static str = "notebooks";
76}
77
78pub struct AutoCommand {}
79impl FeatureFlag for AutoCommand {
80 const NAME: &'static str = "auto-command";
81
82 fn enabled_for_staff() -> bool {
83 false
84 }
85}
86
87pub trait FeatureFlagViewExt<V: 'static> {
88 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
89 where
90 F: Fn(bool, &mut V, &mut ViewContext<V>) + Send + Sync + 'static;
91}
92
93impl<V> FeatureFlagViewExt<V> for ViewContext<'_, V>
94where
95 V: 'static,
96{
97 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
98 where
99 F: Fn(bool, &mut V, &mut ViewContext<V>) + 'static,
100 {
101 self.observe_global::<FeatureFlags>(move |v, cx| {
102 let feature_flags = cx.global::<FeatureFlags>();
103 callback(feature_flags.has_flag::<T>(), v, cx);
104 })
105 }
106}
107
108pub trait FeatureFlagAppExt {
109 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag;
110 fn update_flags(&mut self, staff: bool, flags: Vec<String>);
111 fn set_staff(&mut self, staff: bool);
112 fn has_flag<T: FeatureFlag>(&self) -> bool;
113 fn is_staff(&self) -> bool;
114
115 fn observe_flag<T: FeatureFlag, F>(&mut self, callback: F) -> Subscription
116 where
117 F: FnMut(bool, &mut AppContext) + 'static;
118}
119
120impl FeatureFlagAppExt for AppContext {
121 fn update_flags(&mut self, staff: bool, flags: Vec<String>) {
122 let feature_flags = self.default_global::<FeatureFlags>();
123 feature_flags.staff = staff;
124 feature_flags.flags = flags;
125 }
126
127 fn set_staff(&mut self, staff: bool) {
128 let feature_flags = self.default_global::<FeatureFlags>();
129 feature_flags.staff = staff;
130 }
131
132 fn has_flag<T: FeatureFlag>(&self) -> bool {
133 self.try_global::<FeatureFlags>()
134 .map(|flags| flags.has_flag::<T>())
135 .unwrap_or(false)
136 }
137
138 fn is_staff(&self) -> bool {
139 self.try_global::<FeatureFlags>()
140 .map(|flags| flags.staff)
141 .unwrap_or(false)
142 }
143
144 fn observe_flag<T: FeatureFlag, F>(&mut self, mut callback: F) -> Subscription
145 where
146 F: FnMut(bool, &mut AppContext) + 'static,
147 {
148 self.observe_global::<FeatureFlags>(move |cx| {
149 let feature_flags = cx.global::<FeatureFlags>();
150 callback(feature_flags.has_flag::<T>(), cx);
151 })
152 }
153
154 fn wait_for_flag<T: FeatureFlag>(&mut self) -> WaitForFlag {
155 let (tx, rx) = oneshot::channel::<bool>();
156 let mut tx = Some(tx);
157 let subscription: Option<Subscription>;
158
159 match self.try_global::<FeatureFlags>() {
160 Some(feature_flags) => {
161 subscription = None;
162 tx.take().unwrap().send(feature_flags.has_flag::<T>()).ok();
163 }
164 None => {
165 subscription = Some(self.observe_global::<FeatureFlags>(move |cx| {
166 let feature_flags = cx.global::<FeatureFlags>();
167 if let Some(tx) = tx.take() {
168 tx.send(feature_flags.has_flag::<T>()).ok();
169 }
170 }));
171 }
172 }
173
174 WaitForFlag(rx, subscription)
175 }
176}
177
178pub struct WaitForFlag(oneshot::Receiver<bool>, Option<Subscription>);
179
180impl Future for WaitForFlag {
181 type Output = bool;
182
183 fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
184 self.0.poll_unpin(cx).map(|result| {
185 self.1.take();
186 result.unwrap_or(false)
187 })
188 }
189}