Decouple core Yaak logic from Tauri (#354)

crates/yaak-models/src/render.rs

@@ -0,0 +1,29 @@
+use crate::models::{Environment, EnvironmentVariable};
+use std::collections::HashMap;
+
+pub fn make_vars_hashmap(environment_chain: Vec<Environment>) -> HashMap<String, String> {
+    let mut variables = HashMap::new();
+
+    for e in environment_chain.iter().rev() {
+        variables = add_variable_to_map(variables, &e.variables);
+    }
+
+    variables
+}
+
+fn add_variable_to_map(
+    m: HashMap<String, String>,
+    variables: &Vec<EnvironmentVariable>,
+) -> HashMap<String, String> {
+    let mut map = m.clone();
+    for variable in variables {
+        if !variable.enabled {
+            continue;
+        }
+        let name = variable.name.as_str();
+        let value = variable.value.as_str();
+        map.insert(name.into(), value.into());
+    }
+
+    map
+}