| 1 | #![allow(dead_code)] |
| 2 | |
| 3 | //! Feature flags and metadata for DeepSeek TUI. |
| 4 | |
| 5 | use std::collections::{BTreeMap, BTreeSet}; |
| 6 | use std::fmt::{self, Write as _}; |
| 7 | |
| 8 | use serde::{Deserialize, Serialize}; |
| 9 | |
| 10 | /// Lifecycle stage for a feature flag. |
| 11 | #[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| 12 | pub enum Stage { |
| 13 | Experimental, |
| 14 | Beta, |
| 15 | Stable, |
| 16 | Deprecated, |
| 17 | Removed, |
| 18 | } |
| 19 | |
| 20 | impl Stage { |
| 21 | pub fn as_str(self) -> &'static str { |
| 22 | match self { |
| 23 | Self::Experimental => "experimental", |
| 24 | Self::Beta => "beta", |
| 25 | Self::Stable => "stable", |
| 26 | Self::Deprecated => "deprecated", |
| 27 | Self::Removed => "removed", |
| 28 | } |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | /// Unique features toggled via configuration. |
| 33 | #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)] |
| 34 | pub enum Feature { |
| 35 | /// Enable the default shell tool. |
| 36 | ShellTool, |
| 37 | /// Enable background sub-agent tooling. |
| 38 | Subagents, |
| 39 | /// Enable web search tool. |
| 40 | WebSearch, |
| 41 | /// Enable apply_patch tool. |
| 42 | ApplyPatch, |
| 43 | /// Enable MCP tools. |
| 44 | Mcp, |
| 45 | /// Enable execpolicy integration/tooling. |
| 46 | ExecPolicy, |
| 47 | } |
| 48 | |
| 49 | impl fmt::Display for Stage { |
| 50 | fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { |
| 51 | f.write_str(self.as_str()) |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | impl Feature { |
| 56 | pub fn key(self) -> &'static str { |
| 57 | self.info().key |
| 58 | } |
| 59 | |
| 60 | pub fn stage(self) -> Stage { |
| 61 | self.info().stage |
| 62 | } |
| 63 | |
| 64 | pub fn default_enabled(self) -> bool { |
| 65 | self.info().default_enabled |
| 66 | } |
| 67 | |
| 68 | fn info(self) -> &'static FeatureSpec { |
| 69 | FEATURES |
| 70 | .iter() |
| 71 | .find(|spec| spec.id == self) |
| 72 | .unwrap_or_else(|| unreachable!("missing FeatureSpec for {:?}", self)) |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /// Holds the effective set of enabled features. |
| 77 | #[derive(Debug, Clone, Default, PartialEq)] |
| 78 | pub struct Features { |
| 79 | enabled: BTreeSet<Feature>, |
| 80 | } |
| 81 | |
| 82 | impl Features { |
| 83 | /// Starts with built-in defaults. |
| 84 | pub fn with_defaults() -> Self { |
| 85 | let mut set = BTreeSet::new(); |
| 86 | for spec in FEATURES { |
| 87 | if spec.default_enabled { |
| 88 | set.insert(spec.id); |
| 89 | } |
| 90 | } |
| 91 | Self { enabled: set } |
| 92 | } |
| 93 | |
| 94 | pub fn enabled(&self, feature: Feature) -> bool { |
| 95 | self.enabled.contains(&feature) |
| 96 | } |
| 97 | |
| 98 | pub fn enable(&mut self, feature: Feature) -> &mut Self { |
| 99 | self.enabled.insert(feature); |
| 100 | self |
| 101 | } |
| 102 | |
| 103 | pub fn disable(&mut self, feature: Feature) -> &mut Self { |
| 104 | self.enabled.remove(&feature); |
| 105 | self |
| 106 | } |
| 107 | |
| 108 | pub fn apply_map(&mut self, entries: &BTreeMap<String, bool>) { |
| 109 | for (key, enabled) in entries { |
| 110 | if let Some(feature) = feature_from_key(key) { |
| 111 | if *enabled { |
| 112 | self.enable(feature); |
| 113 | } else { |
| 114 | self.disable(feature); |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | pub fn enabled_features(&self) -> Vec<Feature> { |
| 121 | let mut list: Vec<_> = self.enabled.iter().copied().collect(); |
| 122 | list.sort(); |
| 123 | list |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | /// Keys accepted in `[features]` tables. |
| 128 | pub fn is_known_feature_key(key: &str) -> bool { |
| 129 | FEATURES.iter().any(|spec| spec.key == key) |
| 130 | } |
| 131 | |
| 132 | pub fn feature_from_key(key: &str) -> Option<Feature> { |
| 133 | FEATURES |
| 134 | .iter() |
| 135 | .find(|spec| spec.key == key) |
| 136 | .map(|spec| spec.id) |
| 137 | } |
| 138 | |
| 139 | pub fn feature_spec_by_key(key: &str) -> Option<&'static FeatureSpec> { |
| 140 | FEATURES.iter().find(|spec| spec.key == key) |
| 141 | } |
| 142 | |
| 143 | pub fn render_feature_table(features: &Features) -> String { |
| 144 | let mut output = String::from("feature\tstage\tenabled\n"); |
| 145 | for spec in FEATURES { |
| 146 | let _ = writeln!( |
| 147 | output, |
| 148 | "{}\t{}\t{}", |
| 149 | spec.key, |
| 150 | spec.stage, |
| 151 | features.enabled(spec.id) |
| 152 | ); |
| 153 | } |
| 154 | output |
| 155 | } |
| 156 | |
| 157 | /// Deserializable features table for TOML. |
| 158 | #[derive(Serialize, Deserialize, Debug, Clone, Default, PartialEq)] |
| 159 | pub struct FeaturesToml { |
| 160 | #[serde(flatten)] |
| 161 | pub entries: BTreeMap<String, bool>, |
| 162 | } |
| 163 | |
| 164 | /// Single registry of all feature definitions. |
| 165 | #[derive(Debug, Clone, Copy)] |
| 166 | pub struct FeatureSpec { |
| 167 | pub id: Feature, |
| 168 | pub key: &'static str, |
| 169 | pub stage: Stage, |
| 170 | pub default_enabled: bool, |
| 171 | } |
| 172 | |
| 173 | pub const FEATURES: &[FeatureSpec] = &[ |
| 174 | FeatureSpec { |
| 175 | id: Feature::ShellTool, |
| 176 | key: "shell_tool", |
| 177 | stage: Stage::Stable, |
| 178 | default_enabled: true, |
| 179 | }, |
| 180 | FeatureSpec { |
| 181 | id: Feature::Subagents, |
| 182 | key: "subagents", |
| 183 | stage: Stage::Experimental, |
| 184 | default_enabled: true, |
| 185 | }, |
| 186 | FeatureSpec { |
| 187 | id: Feature::WebSearch, |
| 188 | key: "web_search", |
| 189 | stage: Stage::Experimental, |
| 190 | default_enabled: true, |
| 191 | }, |
| 192 | FeatureSpec { |
| 193 | id: Feature::ApplyPatch, |
| 194 | key: "apply_patch", |
| 195 | stage: Stage::Experimental, |
| 196 | default_enabled: true, |
| 197 | }, |
| 198 | FeatureSpec { |
| 199 | id: Feature::Mcp, |
| 200 | key: "mcp", |
| 201 | stage: Stage::Experimental, |
| 202 | default_enabled: true, |
| 203 | }, |
| 204 | FeatureSpec { |
| 205 | id: Feature::ExecPolicy, |
| 206 | key: "exec_policy", |
| 207 | stage: Stage::Experimental, |
| 208 | default_enabled: true, |
| 209 | }, |
| 210 | ]; |
| 211 | |
| 212 | #[cfg(test)] |
| 213 | mod tests { |
| 214 | use super::*; |
| 215 | |
| 216 | #[test] |
| 217 | fn apply_map_toggles_known_features_and_ignores_unknown_keys() { |
| 218 | let mut features = Features::with_defaults(); |
| 219 | let entries = BTreeMap::from([ |
| 220 | ("mcp".to_string(), false), |
| 221 | ("shell_tool".to_string(), false), |
| 222 | ("not_real".to_string(), false), |
| 223 | ]); |
| 224 | |
| 225 | features.apply_map(&entries); |
| 226 | |
| 227 | assert!(!features.enabled(Feature::Mcp)); |
| 228 | assert!(!features.enabled(Feature::ShellTool)); |
| 229 | assert_eq!(feature_from_key("not_real"), None); |
| 230 | } |
| 231 | |
| 232 | #[test] |
| 233 | fn render_feature_table_uses_registry_order_and_effective_state() { |
| 234 | let mut features = Features::with_defaults(); |
| 235 | features.disable(Feature::Mcp); |
| 236 | |
| 237 | let table = render_feature_table(&features); |
| 238 | let lines = table.lines().collect::<Vec<_>>(); |
| 239 | |
| 240 | assert_eq!(lines.first(), Some(&"feature\tstage\tenabled")); |
| 241 | assert!(lines.contains(&"shell_tool\tstable\ttrue")); |
| 242 | assert!(lines.contains(&"mcp\texperimental\tfalse")); |
| 243 | } |
| 244 | } |
| 245 |