Create epub versions of tutorial and ref manual.

Pandoc can create epub verions of the markdown files. Since the docs
are lengthy, epubs are handy to have around. Two rules to create epub
versions of the reference manual and the main tutorial are added here.

Signed-off-by: Noufal Ibrahim <noufal@nibrahim.net.in>

.gitignore

@@ -30,6 +30,7 @@
 *.cps
 *.log
 *.pdf
+*.epub
 *.html
 *.pg
 *.toc

mk/clean.mk

@@ -53,7 +53,7 @@ clean-misc:
 	$(Q)rm -Rf tmp/*
 	$(Q)rm -Rf rust-stage0-*.tar.bz2 $(PKG_NAME)-*.tar.gz dist
 	$(Q)rm -Rf $(foreach ext, \
-                 html aux cp fn ky log pdf pg toc tp vr cps, \
+                 html aux cp fn ky log pdf pg toc tp vr cps epub, \
                  $(wildcard doc/*.$(ext)))
 	$(Q)find doc/std doc/extra -mindepth 1 | xargs rm -Rf
 	$(Q)rm -Rf doc/version.md

mk/docs.mk

@@ -64,6 +64,20 @@ doc/rust.tex: rust.md doc/version.md
          --from=markdown --to=latex \
          --output=$@
 
+DOCS += doc/rust.epub
+doc/rust.epub: rust.md doc/version_info.html doc/rust.css doc/manual.inc
+	@$(call E, pandoc: $@)
+	$(Q)$(CFG_NODE) $(S)doc/prep.js --highlight $< | \
+	"$(CFG_PANDOC)" \
+         --standalone --toc \
+         --section-divs \
+         --number-sections \
+         --from=markdown --to=epub \
+         --css=rust.css --include-in-header=doc/manual.inc \
+         --include-before-body=doc/version_info.html \
+         --output=$@
+
+
 DOCS += doc/tutorial.tex
 doc/tutorial.tex: tutorial.md doc/version.md
 	@$(call E, pandoc: $@)
@@ -98,6 +112,17 @@ doc/tutorial.html: tutorial.md doc/version_info.html doc/rust.css
            --include-before-body=doc/version_info.html \
            --output=$@
 
+DOCS += doc/tutorial.epub
+doc/tutorial.epub: tutorial.md doc/version_info.html doc/rust.css
+	@$(call E, pandoc: $@)
+	$(Q)$(CFG_NODE) $(S)doc/prep.js --highlight $< | \
+          $(CFG_PANDOC) --standalone --toc \
+           --section-divs --number-sections \
+           --from=markdown --to=epub --css=rust.css \
+           --include-before-body=doc/version_info.html \
+           --output=$@
+
+
 DOCS_L10N += doc/l10n/ja/tutorial.html
 doc/l10n/ja/tutorial.html: doc/l10n/ja/tutorial.md doc/version_info.html doc/rust.css
 	@$(call E, pandoc: $@)