Add extension normalization command

scripts/smoke-test-extension.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+BIN="go run"
+TMP_DIR="$(mktemp -d)"
+trap 'rm -rf "$TMP_DIR"' EXIT
+
+touch "$TMP_DIR/photo.jpeg"
+touch "$TMP_DIR/poster.JPG"
+touch "$TMP_DIR/logo.jpg"
+
+echo "Previewing extension normalization..."
+$BIN "$ROOT_DIR/main.go" extension .jpeg .JPG .jpg --path "$TMP_DIR" --dry-run >/dev/null
+
+echo "Applying extension normalization..."
+$BIN "$ROOT_DIR/main.go" extension .jpeg .JPG .jpg --path "$TMP_DIR" --yes >/dev/null
+
+if [[ ! -f "$TMP_DIR/photo.jpg" ]]; then
+  echo "expected photo.jpg to exist" >&2
+  exit 1
+fi
+
+if [[ ! -f "$TMP_DIR/poster.jpg" ]]; then
+  echo "expected poster.jpg to exist" >&2
+  exit 1
+fi
+
+echo "Undoing extension normalization..."
+$BIN "$ROOT_DIR/main.go" undo --path "$TMP_DIR" >/dev/null
+
+if [[ ! -f "$TMP_DIR/photo.jpeg" ]]; then
+  echo "undo failed to restore photo.jpeg" >&2
+  exit 1
+fi
+
+if [[ ! -f "$TMP_DIR/poster.JPG" ]]; then
+  echo "undo failed to restore poster.JPG" >&2
+  exit 1
+fi
+
+echo "Extension smoke test succeeded."