cb2pdf is a comic book to pdf converter based on ruby. It provides a small API as well as a command line tool.
It uses 7zip to decompress a comic book archive and the two gems prawn and fastimage to assemble the pdf. On windows decompressing should work out of the box. On other OSs 7zip must be installed.
Supported comic book formats are cbr, cbz and cb7 containing images of format
png, jpg or jpeg.
API:
# set 7zip path if conversion doesn't work out of the box
CB2PDF::Converter.seven_zip_path = '/usr/bin/env/7z'
# convert comic1.cbr into C:\comics\pdfs\comic1.pdf
pdf_file = CB2PDF::Converter.convert('C:\comics\comic1.cbr', 'C:\comics\pdfs')
CLI:
cb2pdf [-o output/dir] [--7z-output] [-7z-path path/to/7z.exe]
file1.cbr [C:\\comics\\**\\*.cbz file3.cb7 ...]
As you can see you can use wildcards in file paths that are compatible with Dir::glob.