add support for the conversion of ePUB to MOBI (compatible with Kindle)

SOURCES=$(filter-out $(wildcard src/lammps_commands*.txt) src/lammps_support.txt src/lammps_tutorials.txt,$(wildcard src/*.txt))

OBJECTS=$(SOURCES:src/%.txt=$(RSTDIR)/%.rst)

.PHONY: help clean-all clean epub html pdf old venv spelling anchor_check

.PHONY: help clean-all clean epub mobi html pdf old venv spelling anchor_check

# ------------------------------------------

	@echo "  old        create old-style HTML doc pages in old dir"

	@echo "  fetch      fetch HTML and PDF files from LAMMPS web site"

	@echo "  epub       create ePUB format manual for e-book readers"

	@echo "  mobi       create MOBI format manual for e-book readers (e.g. Kindle)"

	@echo "  clean      remove all intermediate RST files"

	@echo "  clean-all  reset the entire build environment"

	@echo "  txt2html   build txt2html tool"

	@rm -rf epub

	@echo "Build finished. The ePUB manual file is created."

mobi: epub

	@rm -f LAMMPS.mobi

	@ebook-convert LAMMPS.epub LAMMPS.mobi

	@echo "Conversion finished. The MOBI manual file is created."

pdf: utils/txt2html/txt2html.exe

	@(\

		set -e; \