[libvirt] [PATCH v2 03/15] docs: introduce rst2html as a mandatory tool for building docs

[Daniel P. Berrangé]

The rst2html tool is provided by python docutils, and as the name
suggests, it converts RST documents into HTML.

Basic rules are added for integrating RST docs into the website
build process.

This enables us to start writing docs on our website in RST format
instead of HTML, without changing the rest of our website templating
system away from XSLT yet.

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 docs/Makefile.am             | 33 +++++++++++++++++++++++++++------
 libvirt.spec.in              |  2 ++
 m4/virt-external-programs.m4 |  5 +++++
 mingw-libvirt.spec.in        |  1 +
 4 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/docs/Makefile.am b/docs/Makefile.am
index 2a104bc837..7a8adbde2b 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -173,14 +173,26 @@ gif = \
 
 internals_html_in = \
   $(patsubst $(srcdir)/%,%,$(wildcard $(srcdir)/internals/*.html.in))
-internals_html = $(internals_html_in:%.html.in=%.html)
+kbase_rst = \
+  $(patsubst $(srcdir)/%,%,$(wildcard $(srcdir)/kbase/*.rst))
+kbase_rst_html_in = \
+  $(kbase_rst:%.rst=%.html.in)
+internals_html = \
+  $(internals_html_in:%.html.in=%.html) \
+  $(internals_rst_html_in:%.html.in=%.html)
 
 internalsdir = $(HTML_DIR)/internals
 internals_DATA = $(internals_html)
 
 kbase_html_in = \
   $(patsubst $(srcdir)/%,%,$(wildcard $(srcdir)/kbase/*.html.in))
-kbase_html = $(kbase_html_in:%.html.in=%.html)
+kbase_rst = \
+  $(patsubst $(srcdir)/%,%,$(wildcard $(srcdir)/kbase/*.rst))
+kbase_rst_html_in = \
+  $(kbase_rst:%.rst=%.html.in)
+kbase_html = \
+  $(kbase_html_in:%.html.in=%.html) \
+  $(kbase_rst_html_in:%.html.in=%.html)
 
 kbasedir = $(HTML_DIR)/kbase
 kbase_DATA = $(kbase_html)
@@ -191,9 +203,14 @@ dot_html_generated_in = \
   news.html.in
 dot_html_in = \
   $(notdir $(wildcard $(srcdir)/*.html.in))
+dot_rst = \
+  $(notdir $(wildcard $(srcdir)/*.rst))
+dot_rst_html_in = \
+  $(dot_rst:%.rst=%.html)
 dot_html = \
   $(dot_html_generated_in:%.html.in=%.html) \
-  $(dot_html_in:%.html.in=%.html)
+  $(dot_html_in:%.html.in=%.html) \
+  $(dot_rst_html_in:%.html.in=%.html)
 
 htmldir = $(HTML_DIR)
 html_DATA = $(css) $(png) $(gif) $(dot_html)
@@ -222,11 +239,11 @@ EXTRA_DIST= \
   apibuild.py genaclperms.pl \
   site.xsl subsite.xsl newapi.xsl page.xsl \
   wrapstring.xsl \
-  $(dot_html_in) $(gif) $(apipng) \
+  $(dot_html_in) $(dot_rst) $(gif) $(apipng) \
   $(fig) $(png) $(css) \
   $(javascript) $(logofiles) \
-  $(internals_html_in) $(fonts) \
-  $(kbase_html_in) \
+  $(internals_html_in) $(internals_rst) $(fonts) \
+  $(kbase_html_in) $(kbase_rst) \
   aclperms.htmlinc \
   hvsupport.pl \
   $(schema_DATA)
@@ -281,6 +298,10 @@ EXTRA_DIST += \
 %.png: %.fig
 	convert -rotate 90 $< $@
 
+%.html.in: %.rst
+	$(AM_V_GEN)$(MKDIR_P) `dirname $@` && \
+	  $(RST2HTML) $< > $@
+
 %.html.tmp: %.html.in site.xsl subsite.xsl page.xsl \
 		$(acl_generated)
 	$(AM_V_GEN)name=`echo $@ | sed -e 's/.tmp//'`; \
diff --git a/libvirt.spec.in b/libvirt.spec.in
index a6219da604..5c47dd3d7c 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -265,6 +265,8 @@ BuildRequires: automake
 BuildRequires: gettext-devel
 BuildRequires: libtool
 BuildRequires: /usr/bin/pod2man
+# Replace with python3-docutils when we drop py2 support
+BuildRequires: /usr/bin/rst2html
 %endif
 BuildRequires: gcc
 BuildRequires: git
diff --git a/m4/virt-external-programs.m4 b/m4/virt-external-programs.m4
index 0f995998c3..ed634a4c73 100644
--- a/m4/virt-external-programs.m4
+++ b/m4/virt-external-programs.m4
@@ -33,6 +33,11 @@ AC_DEFUN([LIBVIRT_CHECK_EXTERNAL_PROGRAMS], [
   then
     AC_MSG_ERROR("xsltproc is required to build libvirt")
   fi
+  AC_PATH_PROGS([RST2HTML], [rst2html rst2html.py rst2html-3], [])
+  if test -z "$RST2HTML"
+  then
+    AC_MSG_ERROR("rst2html is required to build libvirt")
+  fi
   AC_PATH_PROG([AUGPARSE], [augparse], [/usr/bin/augparse])
   AC_PROG_MKDIR_P
   AC_PROG_LN_S
diff --git a/mingw-libvirt.spec.in b/mingw-libvirt.spec.in
index c29f3eeed2..35f1abc13d 100644
--- a/mingw-libvirt.spec.in
+++ b/mingw-libvirt.spec.in
@@ -82,6 +82,7 @@ BuildRequires: automake
 BuildRequires: gettext-devel
 BuildRequires: libtool
 %endif
+BuildRequires: python3-docutils
 
 BuildRequires: mingw32-libssh2
 BuildRequires: mingw64-libssh2
-- 
2.23.0