preflight(): Initialise cache file

If no cache file is present, `new_pull_requests()` should fail. To allow
it to continue to function even in the absence of a cache file,
initialise the cache file with an empty JSON array.

1 files changed, 4 insertions, 0 deletions

diff --git a/redprine b/redprine
index 3191853..912d825 100755
--- a/redprine
+++ b/redprine
@@ -187,6 +187,10 @@ function exit_with_error () {
 
 function preflight () {
 	mkdir -p "$REDPRINE_DATA_DIR"
+
+	if [ ! -f "$CACHE_FILE" ]; then
+		echo '[]' > "$CACHE_FILE"
+	fi
 }
 
 function argument_error () {