[glib] Rework the man page configury

[Matthias Clasen <matthiasc src gnome org>]

commit 9f9ab640306da52127935bd8eab82a1a8dcaaf89
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Aug 2 23:52:46 2012 +0200

    Rework the man page configury
    
    Default to generate man pages if the required tools and
    stylesheets are found. Error out if --enable-man is given
    but tools or stylesheets are missing.

 configure.ac |   49 +++++++++++++++++++++++++++++++++++++------------
 1 files changed, 37 insertions(+), 12 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 04d7c05..93d0f30 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2590,26 +2590,51 @@ GTK_DOC_CHECK([1.15], [--flavour no-tmpl])
 
 AC_ARG_ENABLE(man,
               [AC_HELP_STRING([--enable-man],
-                              [regenerate man pages from Docbook [default=no]])],enable_man=yes,
-              enable_man=no)
+                              [generate man pages [default=auto]])],,
+              enable_man=maybe)
 
-AS_IF([test "${enable_man}" != no], [
-dnl
-dnl Check for xsltproc
-dnl
-AC_PATH_PROG([XSLTPROC], [xsltproc])
+if test "$enable_man" != no; then
+  AC_PATH_PROG([XSLTPROC], [xsltproc])
   if test -z "$XSLTPROC"; then
+    if test "$enable_man" = yes ; then
+      AC_MSG_ERROR([xsltproc is required for --enable-man])
+    fi
     enable_man=no
   fi
+fi
 
-  dnl check for DocBook DTD and stylesheets in the local catalog.
+if test "$enable_man" != no; then
+  dnl check for DocBook DTD in the local catalog
   JH_CHECK_XML_CATALOG([-//OASIS//DTD DocBook XML V4.1.2//EN],
-     [DocBook XML DTD V4.1.2],,enable_man=no)
+     [DocBook XML DTD V4.1.2], [have_docbook_dtd=yes], [have_docbook_dtd=no])
+  if test "$have_docbook_dtd" != yes; then
+    if test "$enable_man" = yes ; then
+      AC_MSG_ERROR([DocBook DTD is required for --enable-man])
+    fi
+    enable_man=no
+  fi
+fi
+
+if test "$enable_man" != no; then
+  dnl check for DocBook XSL stylesheets in the local catalog
   JH_CHECK_XML_CATALOG([http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl],
-     [DocBook XSL Stylesheets],,enable_man=no)
-])
+     [DocBook XSL Stylesheets], [have_docbook_style=yes],[have_docbook_style=no])
+  if test "$have_docbook_dtd" != yes; then
+    if test "$enable_man" = yes ; then
+      AC_MSG_ERROR([DocBook XSL Stylesheets are required for --enable-man])
+    fi
+    enable_man=no
+  fi
+fi
+
+AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
 
-AM_CONDITIONAL(ENABLE_MAN, test x$enable_man != xno)
+AC_MSG_CHECKING([whether to generate man pages])
+if test "$enable_man" != no; then
+  AC_MSG_RESULT([yes])
+else
+  AC_MSG_RESULT([no])
+fi
 
 dnl
 dnl Tracing