1 files changed, 66 insertions, 0 deletions
diff --git a/common/m4/as-docbook.m4 b/common/m4/as-docbook.m4
new file mode 100644
index 0000000..6a2aa45
--- /dev/null
+++ b/common/m4/as-docbook.m4
@@ -0,0 +1,66 @@
+dnl AS_DOCBOOK([, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+dnl checks if xsltproc can build docbook documentation
+dnl (which is possible if the catalog is set up properly
+dnl I also tried checking for a specific version and type of docbook
+dnl but xsltproc seemed to happily run anyway, so we can't check for that
+dnl and version
+dnl this macro takes inspiration from
+dnl http://www.movement.uklinux.net/docs/docbook-autotools/configure.html
+AC_DEFUN([AS_DOCBOOK],
+[
+  XSLTPROC_FLAGS=--nonet
+  DOCBOOK_ROOT=
+  TYPE_LC=xml
+  TYPE_UC=XML
+  DOCBOOK_VERSION=4.1.2
+
+  if test ! -f /etc/xml/catalog; then
+    for i in /usr/share/sgml/docbook/stylesheet/xsl/nwalsh /usr/share/sgml/docbook/xsl-stylesheets/;
+    do
+      if test -d "$i"; then
+        DOCBOOK_ROOT=$i
+      fi
+    done
+  else
+    XML_CATALOG=/etc/xml/catalog
+    CAT_ENTRY_START='<!--'
+    CAT_ENTRY_END='-->'
+  fi
+
+  dnl We need xsltproc to process the test
+  AC_CHECK_PROG(XSLTPROC,xsltproc,xsltproc,)
+  XSLTPROC_WORKS=no
+  if test -n "$XSLTPROC"; then
+    AC_MSG_CHECKING([whether xsltproc docbook processing works])
+
+    if test -n "$XML_CATALOG"; then
+      DB_FILE="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"
+    else
+      DB_FILE="$DOCBOOK_ROOT/docbook.xsl"
+    fi
+    $XSLTPROC $XSLTPROC_FLAGS $DB_FILE >/dev/null 2>&1 << END
+<?xml version="1.0" encoding='ISO-8859-1'?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook $TYPE_UC V$DOCBOOK_VERSION//EN" "http://www.oasis-open.org/docbook/$TYPE_LC/$DOCBOOK_VERSION/docbookx.dtd">
+<book id="test">
+</book>
+END
+    if test "$?" = 0; then
+      XSLTPROC_WORKS=yes
+    fi
+    AC_MSG_RESULT($XSLTPROC_WORKS)
+  fi
+
+  if test "x$XSLTPROC_WORKS" = "xyes"; then
+    dnl execute ACTION-IF-FOUND
+    ifelse([$1], , :, [$1])
+  else
+    dnl execute ACTION-IF-NOT-FOUND
+    ifelse([$2], , :, [$2])
+  fi
+
+  AC_SUBST(XML_CATALOG)
+  AC_SUBST(XSLTPROC_FLAGS)
+  AC_SUBST(DOCBOOK_ROOT)
+  AC_SUBST(CAT_ENTRY_START)
+  AC_SUBST(CAT_ENTRY_END)
+])