feat(rust): add shared Signal client and workspace configuration

rust/van_weather/Cargo.toml

@@ -6,16 +6,15 @@ description = "Fetch privacy-masked weather for a van and publish it to Home Ass
 license = "MIT"
 
 [dependencies]
-anyhow = "1.0"
-chrono = "0.4"
-clap = { version = "4.5", features = ["derive", "env"] }
-env_logger = "0.11"
-log = "0.4"
+anyhow.workspace = true
+chrono.workspace = true
+clap = { workspace = true, features = ["derive", "env"] }
+env_logger.workspace = true
+log.workspace = true
+num-traits = "0.2"
 reqwest = { version = "0.12", default-features = false, features = ["blocking", "json", "rustls-tls"] }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-
-[lints.clippy]
-all = "deny"
-pedantic = "deny"
+serde = { workspace = true, features = ["derive"] }
+serde_json.workspace = true
 
+[lints]
+workspace = true

rust/van_weather/package.nix

@@ -1,10 +1,26 @@
-{ rustPlatform }:
+{ lib, rustPlatform }:
 rustPlatform.buildRustPackage {
   pname = "van-weather";
   version = "0.1.0";
-  src = ./.;
+  src = lib.fileset.toSource {
+    root = ../..;
+    fileset = lib.fileset.unions [
+      ../../Cargo.toml
+      ../../Cargo.lock
+      ../../clippy.toml
+      ../.
+    ];
+  };
 
-  cargoLock.lockFile = ./Cargo.lock;
+  cargoLock.lockFile = ../../Cargo.lock;
+  cargoBuildFlags = [
+    "-p"
+    "van-weather"
+  ];
+  cargoTestFlags = [
+    "-p"
+    "van-weather"
+  ];
 
   meta = {
     description = "Privacy-masked van weather publisher for Home Assistant";

rust/van_weather/src/main.rs

@@ -4,6 +4,7 @@ use anyhow::{Context, Result, bail};
 use chrono::{DateTime, Utc};
 use clap::Parser;
 use log::{error, info};
+use num_traits::ToPrimitive;
 use reqwest::{
     StatusCode, Url,
     blocking::{Client, ClientBuilder},
@@ -25,7 +26,7 @@ const fn decimal_factor(decimals: u32) -> f64 {
     let mut remaining = decimals;
     while remaining > 0 {
         factor *= 10.0;
-        remaining -= 1;
+        remaining = remaining.saturating_sub(1);
     }
     factor
 }
@@ -468,18 +469,25 @@ fn weather_updates(weather: &Weather) -> Vec<(String, Value)> {
 }
 
 fn sensor(entity_id: &str, state: Option<Value>, attributes: Value) -> Option<(String, Value)> {
-    state.map(|state| {
-        let mut payload = serde_json::Map::new();
-        payload.insert("state".to_owned(), state);
-        payload.insert("attributes".to_owned(), attributes);
-        (entity_id.to_owned(), Value::Object(payload))
-    })
+    let state = state?;
+    let mut payload = serde_json::Map::new();
+    payload.insert("state".to_owned(), state);
+    payload.insert("attributes".to_owned(), attributes);
+    Some((entity_id.to_owned(), Value::Object(payload)))
 }
 
-#[allow(clippy::cast_possible_truncation)]
 fn percent(value: Option<f64>) -> i64 {
     // Preserve Python's int(probability * 100) behavior for Home Assistant.
-    (value.unwrap_or_default() * 100.0) as i64
+    let value = value.unwrap_or_default() * 100.0;
+    value.to_i64().unwrap_or_else(|| {
+        if value.is_nan() {
+            0
+        } else if value.is_sign_negative() {
+            i64::MIN
+        } else {
+            i64::MAX
+        }
+    })
 }
 
 #[cfg(test)]
@@ -562,4 +570,21 @@ mod tests {
         assert!((mask_coordinate(37.7749) - 37.8).abs() < f64::EPSILON);
         assert!((mask_coordinate(-122.4194) - (-122.4)).abs() < f64::EPSILON);
     }
+
+    #[test]
+    fn percentages_truncate_and_preserve_saturation_for_extreme_values() {
+        for (value, expected) in [
+            (None, 0),
+            (Some(0.129), 12),
+            (Some(-0.129), -12),
+            (Some(1.0), 100),
+            (Some(f64::NAN), 0),
+            (Some(f64::MAX), i64::MAX),
+            (Some(f64::MIN), i64::MIN),
+            (Some(f64::INFINITY), i64::MAX),
+            (Some(f64::NEG_INFINITY), i64::MIN),
+        ] {
+            assert_eq!(percent(value), expected);
+        }
+    }
 }