Add support for ebook generation in ePUB and mobi format

doc/Makefile

@@ -22,7 +22,7 @@ endif
 SOURCES=$(wildcard src/*.txt)
 OBJECTS=$(SOURCES:src/%.txt=$(RSTDIR)/%.rst)
 
-.PHONY: help clean-all clean epub html pdf old venv
+.PHONY: help clean-all clean ebook html pdf old venv
 
 # ------------------------------------------
 
@@ -32,7 +32,7 @@ help:
 	@echo "  pdf        create Manual.pdf and Developer.pdf in this dir"
 	@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 file with manual in this dir"
+	@echo "  ebook      create ePUB/mobi file with manual in this dir"
 	@echo "  clean      remove all intermediate RST files"
 	@echo "  clean-all  reset the entire build environment"
 	@echo "  txt2html   build txt2html tool"
@@ -64,16 +64,19 @@ html: $(OBJECTS)
 	@rm -rf html/USER/*/*.[sg]*
 	@echo "Build finished. The HTML pages are in doc/html."
 
-epub: $(OBJECTS)
+ebook: $(OBJECTS)
+	@mkdir -p epub
+	@cp src/JPG/lammps-logo.png epub/
 	@(\
 		. $(VENV)/bin/activate ;\
 		cp -r src/* $(RSTDIR)/ ;\
 		sphinx-build -j 8 -b epub -c utils/sphinx-config -d $(BUILDDIR)/doctrees $(RSTDIR) epub ;\
 		deactivate ;\
 	)
-	@mv -f epub/LAMMPS.epub .
+	@-(cd epub; ebook-convert LAMMPS.epub LAMMPS.mobi )
+	@-mv -f epub/LAMMPS.epub epub/LAMMPS.mobi .
 	@rm -rf epub
-	@echo "Build finished. The ePUB file LAMMPS.epub is created/updated."
+	@echo "Build finished. The ebook file(s) is/are created."
 
 pdf: utils/txt2html/txt2html.exe
 	@(\

doc/README

 LAMMPS Documentation
 
 Depending on how you obtained LAMMPS, this directory has 2 or 3
-sub-directories and optionally 2 PDF files:
+sub-directories and optionally 2 PDF files and 2 ebook files:
 
 src             content files for LAMMPS documentation
 html            HTML version of the LAMMPS manual (see html/Manual.html)
 tools           tools and settings for building the documentation
 Manual.pdf      large PDF version of entire manual
 Developer.pdf   small PDF with info about how LAMMPS is structured
+LAMMPS.epub     Manual in ePUB format
+LAMMPS.mobi     Manual in mobi format (required for for Kindle)
 
 If you downloaded LAMMPS as a tarball from the web site, all these
 directories and files should be included.
@@ -49,6 +51,9 @@ make pdf          # generate 2 PDF files (Manual.pdf,Developer.pdf)
 make old          # generate old-style HTML pages in old dir via txt2html
 make fetch        # fetch HTML doc pages and 2 PDF files from web site
                   #   as a tarball and unpack into html dir and 2 PDFs
+make ebook        # generate e-book LAMMPS.epub in ePUB format using Sphinx 
+                  #   optionally convert it to mobi format (for Kindle
+                  #   readers, requires "ebook-convert" from Calibre)
 make clean        # remove intermediate RST files created by HTML build
 make clean-all    # remove entire build folder and any cached data
 
@@ -91,3 +96,22 @@ This will install virtualenv from the Python Package Index.
 ----------------
 
 Installing prerequisites for PDF build
+
+[TBA]
+
+----------------
+
+Installing prerequisites for ebook build
+
+## ePUB
+
+Same as for HTML. This uses the same tools and configuration
+files as the HTML tree.
+
+## mobi
+
+For converting the generated ePUB file to a mobi format file
+(for e-book readers, that cannot read ePUB), you also need to have
+the 'ebook-convert' tool from the "calibre" software installed.
+http://calibre-ebook.com/
+

doc/utils/sphinx-config/conf.py

@@ -276,4 +276,27 @@ texinfo_documents = [
 # If true, do not generate a @detailmenu in the "Top" node's menu.
 #texinfo_no_detailmenu = False
 
+# -- Options for ePUB output ----------------------------------------------
+
+epub_title = 'LAMMPS Documentation - ' + get_lammps_version()
+
+epub_cover = ('lammps-logo.png', '')
+
+epub_description = """
+This is the Manual for the LAMMPS software package.
+
+LAMMPS stands for Large-scale Atomic/Molecular Massively Parallel
+Simulator and is a classical molecular dynamics simulation code
+designed to run efficiently on parallel computers.  It was developed
+at Sandia National Laboratories, a US Department of Energy facility,
+with funding from the DOE.  It is an open-source code, distributed
+freely under the terms of the GNU Public License (GPL).
+
+The primary author of the code is Steve Plimpton, who can be emailed
+at sjplimp@sandia.gov.  The LAMMPS WWW Site at lammps.sandia.gov has
+more information about the code and its uses.
+"""
+
+epub_author = 'The LAMMPS Developers'
+