[PATCH] doc: Allow rst2man.py as an alternative to rst2man

[Tomi Ollila <tomi.ollila@iki.fi>]

From: W. Trevor King <wking@tremily.us>

Gentoo's dev-python/docutils-0.10 installs Docutils scripts with a
*.py extension, so I have /usr/bin/rst2man.py and no rst2man script.
This patch supports users with both types of systems by checking for
rst2man, falling back on rst2man.py, and giving up only if neither is
found.  Users can also set the new RST2MAN path variable explicitly
when they call Make:

  make RST2MAN=/my/custom/rst_to_man_converter build-man

We pass the configured RST2MAN path through to prerst2man.py to use in
its system call.

We can use a non-empty RST2MAN to check for the availability of an
rst2man program, so there's no need for a separate HAVE_RST2MAN.
However, we keep the existing HAVE_RST2MAN for consistency with
HAVE_SPHINX.
---

rebased original
id:2621721db05068dffb65b88cd50d2a5b49e967f5.1405220724.git.wking@tremily.us

rebased by simply doing patch -p1 < patchfile and then creating commit.


 configure          | 20 +++++++++++++++-----
 doc/Makefile.local |  2 +-
 doc/prerst2man.py  |  9 +++++----
 3 files changed, 21 insertions(+), 10 deletions(-)

diff --git a/configure b/configure
index 9c98040c4531..8a4305f8bde3 100755
--- a/configure
+++ b/configure
@@ -455,17 +455,23 @@ if hash sphinx-build > /dev/null 2>&1 && python -m sphinx.writers.manpage > /dev
     printf "Yes.\n"
     have_sphinx=1
     have_rst2man=0
+    RST2MAN=
 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"
+    for RST2MAN in rst2man rst2man.py; do
+	if "${RST2MAN}" -V > /dev/null 2>&1; then
+	    have_rst2man=1
+	    printf "Yes (${RST2MAN}).\n"
+	    break
+	fi
+	RST2MAN=
+    done
+    if [ -z "${RST2MAN}" ]; then
        have_rst2man=0
+       printf "No (so will not install man pages).\n"
     fi
 fi
 
@@ -861,6 +867,10 @@ HAVE_RST2MAN=${have_rst2man}
 # Whether there's a doxygen binary available for building api documentation
 HAVE_DOXYGEN=${have_doxygen}
 
+# The path to the rst2man program for building documentation.  Set to
+# an empty string if no such program is available.
+RST2MAN=${RST2MAN}
+
 # The directory to which desktop files should be installed
 desktop_dir = \$(prefix)/share/applications
 
diff --git a/doc/Makefile.local b/doc/Makefile.local
index e7d0bac8f3fb..a13cb3731664 100644
--- a/doc/Makefile.local
+++ b/doc/Makefile.local
@@ -51,7 +51,7 @@ ifeq ($(HAVE_SPHINX),1)
 	    mv $(DOCBUILDDIR)/man/*.$${section} $(DOCBUILDDIR)/man/man$${section}; \
 	done
 else ifeq ($(HAVE_RST2MAN),1)
-	$(prerst2man) $(srcdir)/doc $(DOCBUILDDIR)/man
+	$(prerst2man) "$(RST2MAN)" $(srcdir)/doc $(DOCBUILDDIR)/man
 else
 	@echo "Fatal: build dependency fail."
 	@false
diff --git a/doc/prerst2man.py b/doc/prerst2man.py
index 968722a1c750..2e87976c5d96 100644
--- a/doc/prerst2man.py
+++ b/doc/prerst2man.py
@@ -4,8 +4,9 @@ from os.path import dirname, isdir
 from os import makedirs, system
 import re
 
-sourcedir = argv[1]
-outdir = argv[2]
+rst2man = argv[1]
+sourcedir = argv[2]
+outdir = argv[3]
 
 if not isdir(outdir):
     makedirs(outdir, 0o755)
@@ -60,5 +61,5 @@ for page in man_pages:
     outfile.write("".join(lines))
     outfile.close()
 
-    system('set -x; rst2man {0} {1}/{2}.{3}'
-           .format(filename, outdir, page[0], page[4]))
+    system('set -x; {0} {1} {2}/{3}.{4}'
+           .format(rst2man, filename, outdir, page[0], page[4]))
-- 
2.0.0