feat: detect battery mode

crates/tinymist-std/Cargo.toml

@@ -33,6 +33,7 @@ time = { workspace = true, features = ["formatting"] }
 lsp-types.workspace = true
 tempfile = { workspace = true, optional = true }
 same-file = { workspace = true, optional = true }
+battery = { workspace = true, optional = true }
 
 # feature = "web"
 js-sys = { workspace = true, optional = true }
@@ -78,7 +79,7 @@ rkyv-validation = ["rkyv/validation"]
 
 __web = ["wasm-bindgen", "js-sys", "web-time"]
 web = ["__web"]
-system = ["tempfile", "same-file"]
+system = ["tempfile", "same-file", "battery"]
 bi-hash = []
 
 [lints]

crates/tinymist-std/src/battery.rs

@@ -0,0 +1,30 @@
+//! Battery-related utilities.
+
+#[cfg(feature = "system")]
+mod system {
+    /// Detects if the system is currently in power saving mode.
+    pub fn is_power_saving() -> bool {
+        ::battery::Manager::new()
+            .ok()
+            .and_then(|manager| manager.batteries().ok())
+            .map(|mut batteries| {
+                batteries.any(|battery| match battery {
+                    Ok(bat) => matches!(bat.state(), ::battery::State::Discharging),
+                    Err(_) => false,
+                })
+            })
+            .unwrap_or(false)
+    }
+}
+#[cfg(feature = "system")]
+pub use system::*;
+
+#[cfg(not(feature = "system"))]
+mod other {
+    /// Detects if the system is currently in power saving mode.
+    pub fn is_power_saving() -> bool {
+        false
+    }
+}
+#[cfg(not(feature = "system"))]
+pub use other::*;

crates/tinymist-std/src/lib.rs

@@ -1,6 +1,7 @@
 //! Additional functions wrapping Rust's standard library.
 
 pub mod adt;
+pub mod battery;
 pub mod error;
 pub mod fs;
 pub mod hash;

crates/tinymist/src/config.rs

@@ -378,12 +378,13 @@ impl Config {
             }
         };
         self.syntax_only = match try_(|| update.get("syntaxOnly")?.as_str()) {
-            Some("enable" | "onPowerSaving") => true,
+            Some("onPowerSaving") => tinymist_std::battery::is_power_saving(),
+            Some("enable") => true,
             Some("disable" | "auto") | None => false,
             Some(value) => {
                 self.warnings.push(tinymist_l10n::t!(
-                    "tinymist.config.badCompileStatus",
-                    "compileStatus must be either `\"enable\"`, `\"disable\", `\"onPowerSaving\"`, or `\"auto\"`, got {value}",
+                    "tinymist.config.badSyntaxOnly",
+                    "syntaxOnly must be either `\"enable\"`, `\"disable\", `\"onPowerSaving\"`, or `\"auto\"`, got {value}",
                     value = value.debug_l10n(),
                 ));