improved error handling

introduced toml config

src/model.rs

@@ -0,0 +1,22 @@
+use crate::config::OllamaModelConfig;
+use ollama_rs::Ollama;
+use ollama_rs::error::OllamaError;
+use ollama_rs::models::ModelOptions;
+use ollama_rs::models::create::{CreateModelRequest, CreateModelStatus};
+
+pub async fn create_model_from_config(
+    ollama: &Ollama,
+    config: &OllamaModelConfig,
+) -> Result<CreateModelStatus, OllamaError> {
+    let model_options = ModelOptions::default()
+        .num_ctx(config.context_size.unwrap_or(2048))// 2048 is the ollama default.
+        .temperature(config.temperature.unwrap_or(0.8)); // 0.8 is the ollama default
+
+    ollama
+        .create_model(
+            CreateModelRequest::new(config.name.clone())
+                .from_model(config.from_model.clone())
+                .parameters(model_options),
+        )
+        .await
+}