fix: update code and docs about syntax mode (#2248)

which was detected by gemini review.

crates/tinymist-std/src/battery.rs

@@ -7,8 +7,12 @@ mod system {
         ::battery::Manager::new()
             .ok()
             .and_then(|manager| manager.batteries().ok())
-            .map(|mut batteries| {
-                batteries.any(|battery| match battery {
+            .map(|batteries| {
+                let mut batteries = batteries.peekable();
+                if batteries.peek().is_none() {
+                    return false;
+                }
+                batteries.all(|battery| match battery {
                     Ok(bat) => matches!(bat.state(), ::battery::State::Discharging),
                     Err(_) => false,
                 })

crates/typst-shim/src/syntax_only.rs

@@ -11,7 +11,7 @@ pub static SYNTAX_ONLY: AtomicBool = AtomicBool::new(false);
 
 /// Check if syntax-only mode is enabled.
 pub fn is_syntax_only() -> bool {
-    SYNTAX_ONLY.load(Ordering::Relaxed)
+    SYNTAX_ONLY.load(Ordering::Acquire)
 }
 
 /// Compile the document if syntax-only mode is disabled; otherwise, return an

docs/tinymist/feature/syntax-only-mode.typ

@@ -7,18 +7,18 @@ The syntax-only mode is available since `tinymist` v0.14.2.
 When working under power-saving mode or with resource-consumed projects, typst compilations costs too much CPU and memory resources. From a simple test on a typst document with 200 pages, containing complex figures and WASM plugin calls, editing a large `.typ` file on a windows laptop (i9-12900H), the CPU and memory usage are as follows:
 
 #align(center, table(
-  columns: 3,
-  [Mode], [CPU Usage], [Memory Usage],
-  [Normal Mode], [5% \~ 12%], [0.9\~1.184 GB],
-  [Syntax-Only Mode], [0% \~ 0.6%], [15.1\~16.0 MB],
+  columns: 4,
+  [Mode], [CPU Usage], [Memory Usage (Code Compilation)], [Memory Usage (Incremental Compilation)],
+  [Normal Mode], [5% \~ 12%], [2.72 GB], [6.62\~8.73GB],
+  [Syntax-Only Mode], [0% \~ 0.6%], [15.0 MB], [15.1\~16.0 MB],
 ))
 
 You can configure the extension to run in syntax only mode, i.e. only performing elementary tasks, like syntax checking, syntax-only code analysis and formatting by setting the `tinymist.syntaxOnly` to `enable` or `onPowerSaving` in the configuration.
 
-The syntax-only mode is known to disable or disallowed:
+The syntax-only mode is known to disable or limit the functionality of the following features:
 - typst preview feature.
-- label completion.
 - compilation diagnostics.
+- label completion.
 
 The syntax-only mode will be able to work with following features:
 - export PDF or other formats.