[PATCH 2/3] doc: configure detection of sphinx and rst2man

[David Bremner]

Because sphinx-build does not provide a convenient way of listing
which builders exist, and some people actually have pre 1.0 sphinx, we
try loading a relevant python module.

Currently the assumption is that no python in path -> no sphinx-build
in path.
---
 configure | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/configure b/configure
index 2eaed4a..10356e7 100755
--- a/configure
+++ b/configure
@@ -393,6 +393,27 @@ else
     have_emacs=0
 fi
 
+printf "Checking if sphinx is available and supports nroff output... "
+if hash sphinx-build > /dev/null 2>&1 && python -m sphinx.writers.manpage > /dev/null 2>&1 ; then
+    printf "Yes.\n"
+    have_sphinx=1
+    have_rst2man=0
+else
+    printf "No (falling back to rst2man).\n"
+    have_sphinx=0
+
+    printf "Checking if rst2man is available... "
+    if rst2man -V > /dev/null 2>&1; then
+       printf "Yes.\n"
+       have_rst2man=1
+    else
+       printf "No (so will not install man pages).\n"
+       have_rst2man=0
+    fi
+fi
+
+
+
 libdir_in_ldconfig=0
 
 printf "Checking which platform we are on... "
@@ -759,6 +780,12 @@ emacsetcdir=${EMACSETCDIR}
 # Whether there's an emacs binary available for byte-compiling
 HAVE_EMACS = ${have_emacs}
 
+# Whether there's a sphinx-build binary available for building documentation
+HAVE_SPHINX=${have_sphinx}
+
+# Whether there's a rst2man binary available and used for building documentation
+HAVE_RST2MAN=${have_rst2man}
+
 # The directory to which desktop files should be installed
 desktop_dir = \$(prefix)/share/applications
 
-- 
1.8.5.3