Tons of refactoring and some fixes and enhancements... ;)

scripts/run_examples.sh

@@ -0,0 +1,69 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")"/.. && pwd)"
+EX_DIR="$ROOT/examples"
+
+# Allow override via first arg or FUN_BIN env
+BIN="${1:-${FUN_BIN:-}}"
+
+pick_bin() {
+  local cands=(
+    "$ROOT/fun"
+    "$ROOT/build/fun"
+    "$ROOT/build/bin/fun"
+    "$ROOT/cmake-build-debug/fun"
+    "$ROOT/cmake-build-release/fun"
+  )
+  for p in "${cands[@]}"; do
+    [[ -x "$p" ]] && { echo "$p"; return 0; }
+  done
+  # Last resort: search shallowly for an executable named 'fun' under common build dirs
+  local found
+  found="$(
+    find "$ROOT" -maxdepth 3 -type f -name fun -perm -u+x 2>/dev/null \
+      | grep -E '/(build|cmake-build[^/]*)/fun$' \
+      | head -n 1 || true
+  )"
+  [[ -n "$found" ]] && { echo "$found"; return 0; }
+  return 1
+}
+
+if [[ -z "${BIN}" ]]; then
+  if ! BIN="$(pick_bin)"; then
+    echo "error: fun binary not found. Try building it (e.g., via CMake) or pass it explicitly:" >&2
+    echo "  scripts/run_examples.sh /path/to/fun" >&2
+    echo "or set FUN_BIN=/path/to/fun" >&2
+    exit 2
+  fi
+fi
+
+if [[ ! -x "$BIN" ]]; then
+  echo "error: fun binary not found or not executable at $BIN" >&2
+  exit 2
+fi
+
+shopt -s nullglob
+files=("$EX_DIR"/*.fun)
+shopt -u nullglob
+
+if (( ${#files[@]} == 0 )); then
+  echo "No .fun example files found in $EX_DIR"
+  exit 0
+fi
+
+rc=0
+for f in "${files[@]}"; do
+  echo "=== Running: ${f#$ROOT/} ==="
+  if ! "$BIN" "$f"; then
+    echo "FAILED: ${f#$ROOT/}"
+    rc=1
+  fi
+done
+
+if (( rc == 0 )); then
+  echo "All examples ran successfully."
+else
+  echo "Some examples failed."
+fi
+exit $rc