Watch mode

Watch mode regenerates the PDF whenever the input file changes.

code-down -w input.md

Note: -w comes before the file.

You can still set theme/output:

code-down -w input.md -s light
code-down -w input.md -o out.pdf

Watch mode handles file modifications, creation, deletion, and replacement saves used by editors. It waits until changes settle, then rebuilds once per burst. Changes during a render trigger a subsequent render rather than overlapping it. Referenced local images and HTML resource links are watched too, including resources outside the Markdown directory. New references are discovered on save.

PDF output is replaced only after rendering succeeds. A failed rebuild keeps the previous PDF and prints an error; watch mode continues until Ctrl+C.