Added structs for config data

src/util/config.rs

@@ -1 +1,32 @@
+use std::{path::PathBuf, collections::HashMap};
+
 use serde_yaml;
+
+#[derive(Default)]
+struct Config {
+    executable_paths: HashMap<String, PathBuf>,
+
+    input_path: PathBuf,
+    output_path: PathBuf,
+
+    toolchains: Vec<Toolchain>,
+}
+
+#[derive(Default)]
+struct Toolchain {
+    name: String,
+    steps: Vec<Step>,
+}
+
+#[derive(Default)]
+struct Step {
+    name: String,
+
+    executable_path: Option<PathBuf>, // if None then we use the current executable path
+    arguments: Vec<String>, // special string $INPUT corresponds to previous step output
+    output: String, // the output file name
+}
+
+pub fn parse_config(path: PathBuf) {
+
+}