initial

build.rs

@@ -0,0 +1,28 @@
+use std::error::Error;
+
+#[toml_cfg::toml_config]
+pub struct Config {
+    #[default("")]
+    wifi_ssid: &'static str,
+    #[default("")]
+    wifi_psk: &'static str,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    // Check if the `cfg.toml` file exists and has been filled out.
+    if !std::path::Path::new("cfg.toml").exists() {
+        return Err("You need to create a `cfg.toml` file with your Wi-Fi credentials! Start from `cfg.toml.template`.".into());
+    }
+
+    // The constant `CONFIG` is auto-generated by `toml_config`.
+    let app_config = CONFIG;
+    if app_config.wifi_ssid == "SET_ME" || app_config.wifi_psk == "SET_ME" {
+        return Err("You need to set the Wi-Fi credentials in `cfg.toml`!".into());
+    }
+
+    // Necessary because of this issue: https://github.com/rust-lang/cargo/issues/9641
+    embuild::build::CfgArgs::output_propagated("ESP_IDF")?;
+    embuild::build::LinkArgs::output_propagated("ESP_IDF")?;
+
+    Ok(())
+}