Use XDG directories to map downloads

This provides standard locations for files regardless of the location of
the binary and/or the working directory.

Could allow some customization in the future, both as a permanent config
or one-time case.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/epub.rs b/src/epub.rs
index 79ac11e..4f31784 100644
--- a/src/epub.rs
+++ b/src/epub.rs
@@ -74,6 +74,9 @@ pub fn create_epub_archive(
     file_entries: &[FileEntry],
     chapters: &HashMap<String, Chapter>,
 ) -> Result<()> {
+    if let Some(parent_dir) = output_epub.parent() {
+        std::fs::create_dir_all(parent_dir)?;
+    }
     let out_file = std::fs::File::create(output_epub)?;
     let mut zip = ZipWriter::new(out_file);