feat: separate files, basic gpio util prep, config parsing

src/gpio_utils.rs

@@ -0,0 +1,52 @@
+use std::collections::HashMap;
+
+use crate::conf::{PinMode, Topic};
+
+/// Split topics into in and out pins. Returns them in this order
+///
+/// * `topics`: The topics to use
+pub fn split_topics_and_configure_pins(topics: Vec<Topic>) -> (Vec<Topic>, Vec<Topic>) {
+    let mut in_pins: Vec<Topic> = Vec::new();
+    let mut out_pins: Vec<Topic> = Vec::new();
+    for topic in topics {
+        if topic.mode == PinMode::IN {
+            in_pins.push(topic);
+        } else {
+            out_pins.push(topic);
+        }
+    }
+
+    return (in_pins, out_pins);
+}
+
+pub fn read_pin_value(id: u16) {}
+
+pub struct GPIOController {
+    in_pins: HashMap<String, Topic>,
+}
+
+impl GPIOController {
+    /// Create a new GPIO controller.
+    /// Note that the move of ownership is intentional behaviour. Only create one instance of this controller!
+    ///
+    /// * `topics`: The topics that are going to be managed by this controller (All OUT mode pins
+    /// are dropped without error)
+    pub fn new(topics: Vec<Topic>) -> Self {
+        let mut controller = GPIOController {
+            in_pins: HashMap::new(),
+        };
+
+        // Build hash maps
+        for topic in topics {
+            if topic.mode == PinMode::IN {
+                controller
+                    .in_pins
+                    .insert(String::from(topic.topic.as_str()), topic);
+            }
+        }
+
+        return controller;
+    }
+
+    pub fn handle_event(&self) {}
+}