Allow loading system prompts from a file

Managing large or multi-line system prompts directly via the
:systemPromptTemplate key is cumbersome.

This commit introduces a new :systemPromptTemplateFile key that
accepts a path to a file.

Author: Jakub Zika

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+- Support loading system prompts from a file.
+- Fix model name parsing.
+
 ## 0.23.1
 
 - Fix openai reasoning not being included in messages.
@@ -159,7 +162,7 @@
 
 ## 0.10.2
 
-- Fix usage metrics for anthropic models. 
+- Fix usage metrics for anthropic models.
 
 ## 0.10.1
 

docs/configuration.md

@@ -185,7 +185,7 @@ interface Config {
     anthropicApiKey?: string;
     rules: [{path: string;}];
     commands: [{path: string;}];
-    systemPromptTemplate?: string;
+    systemPromptTemplateFile?: string;
     nativeTools: {
         filesystem: {enabled: boolean};
          shell: {enabled: boolean;

src/eca/features/prompt.clj

@@ -22,7 +22,7 @@
 (def ^:private agent-behavior (memoize agent-behavior*))
 
 (defn ^:private eca-prompt [behavior config]
-  (let [prompt (or (:systemPromptTemplate config)
+  (let [prompt (or (some-> (:systemPromptTemplateFile config) slurp)
                    (base-prompt-template))]
     (reduce
      (fn [p [k v]]