[draft] first pass at tui integration

codex-rs/execpolicy2/tests/writer.rs

@@ -0,0 +1,40 @@
+use codex_execpolicy2::Decision;
+use codex_execpolicy2::append_prefix_rule;
+use std::fs;
+use tempfile::tempdir;
+
+#[test]
+fn appends_creating_missing_policy_file() {
+    let dir = tempdir().expect("create temp dir");
+    let path = dir.path().join("policy").join("default.codexpolicy");
+
+    append_prefix_rule(
+        &path,
+        &["rg".to_string(), "--files".to_string()],
+        Decision::Allow,
+    )
+    .expect("append rule");
+
+    let contents = fs::read_to_string(path).expect("read policy");
+    assert_eq!(
+        contents,
+        "prefix_rule(pattern=[\"rg\", \"--files\"], decision=\"allow\")\n"
+    );
+}
+
+#[test]
+fn appends_rules_with_newlines() {
+    let dir = tempdir().expect("create temp dir");
+    let path = dir.path().join("policy.codexpolicy");
+    append_prefix_rule(&path, &["ls".to_string()], Decision::Allow).expect("append first rule");
+    append_prefix_rule(&path, &["pwd".to_string()], Decision::Allow).expect("append second rule");
+
+    let contents = fs::read_to_string(path).expect("read policy");
+    assert_eq!(
+        contents,
+        "\
+prefix_rule(pattern=[\"ls\"], decision=\"allow\")
+prefix_rule(pattern=[\"pwd\"], decision=\"allow\")
+"
+    );
+}