Detect Ploticus at configuration-time and decide how to build the doc.

* configure.ac: Look for `ploticus' or `pl'.  Create an AM conditional.

* doc/user/Makefile.am (BUILT_SOURCES): Set to `doc-config.scm'.
  (html_DATA): New, set to `user.html'.
  (ps_DATA): Likewise.
  (doc-config.scm): New target.

* doc/user/user.skb: Load `doc-config.scm' and update `%ploticus-program'
  accordingly.  Decide whether or not to include `pie.skb'.

* src/guile/skribilo/package/pie.scm: Export `%ploticus-program' and
  `%ploticus-debug?'.

git-archimport-id: lcourtes@laas.fr--2005-libre/skribilo--devo--1.2--patch-26

4 files changed, 24 insertions, 4 deletions

diff --git a/configure.ac b/configure.ac
index 5b57f87..e889401 100644
--- a/configure.ac
+++ b/configure.ac
@@ -21,6 +21,11 @@ GUILE_MODULE_REQUIRED([srfi srfi-35])
 AC_PATH_PROG([LOUT], [lout], [not-found])
 AM_CONDITIONAL([HAVE_LOUT], [test "x$LOUT" != "xnot-found"])
 
+# Look for Ploticus.
+AC_PATH_PROGS([PLOTICUS], [ploticus pl], [not-found])
+AM_CONDITIONAL([HAVE_PLOTICUS], [test "x$PLOTICUS" != "xnot-found"])
+
+
 AC_SUBST([SKRIBILO_DOC_DIR], ["$datadir/doc/skribilo"])
 AC_SUBST([SKRIBILO_EXT_DIR], ["$datadir/skribilo/1.2/"])
 AC_SUBST([SKRIBILO_SKR_PATH], ["$GUILE_SITE/"])
diff --git a/doc/user/Makefile.am b/doc/user/Makefile.am
index 7d22cd8..3428ad5 100644
--- a/doc/user/Makefile.am
+++ b/doc/user/Makefile.am
@@ -8,7 +8,8 @@ EXTRA_DIST = bib.skb char.skb colframe.skb document.skb emacs.skb	\
   skribe-config.skb skribec.skb skribeinfo.skb slide.skb start.skb	\
   syntax.skb table.skb toc.skb user.skb xmle.skb
 
-BUILT_SOURCES = user.html
+BUILT_SOURCES = doc-config.scm
+html_DATA = user.html
 
 skribilo = $(top_srcdir)/src/skribilo
 load_path = $(top_srcdir)/src/guile:$(top_srcdir)/src/guile/skribilo/package
@@ -19,7 +20,7 @@ load_path = $(top_srcdir)/src/guile:$(top_srcdir)/src/guile/skribilo/package
 
 if HAVE_LOUT
 
-BUILT_SOURCES += user.ps
+ps_DATA = user.ps
 
 %.lout: %.skb
 	GUILE_LOAD_PATH=$(load_path):$$GUILE_LOAD_PATH \
@@ -30,3 +31,11 @@ BUILT_SOURCES += user.ps
 
 endif
 
+if HAVE_PLOTICUS
+doc-config.scm:
+	-echo "(define %have-ploticus? #t)" > $@
+	-echo "(define %ploticus-path \"$(PLOTICUS)\")" >> $@
+else
+doc-config.scm:
+	-echo "(define %have-ploticus? #f) (define %ploticus-path #f)" > $@
+endif
diff --git a/doc/user/user.skb b/doc/user/user.skb
index 82e614e..68c3d23 100644
--- a/doc/user/user.skb
+++ b/doc/user/user.skb
@@ -23,6 +23,11 @@
 (use-modules (skribilo package eq)
 	     (skribilo package pie))
 
+;; Load the compile-time configuration file.
+(load "doc-config.scm")
+
+(if %have-ploticus? (set! %ploticus-program %ploticus-path))
+
 ;*---------------------------------------------------------------------*/
 ;*    HTML custom                                                      */
 ;*---------------------------------------------------------------------*/
@@ -138,7 +143,7 @@ as HTML, Info pages, man pages, Postscript, etc.]))))
 (include "eq.skb")
 
 ;;; Pie charts
-(include "pie.skb")
+(if %have-ploticus? (include "pie.skb"))
 
 ;;; Standard Library
 (include "lib.skb")
diff --git a/src/guile/skribilo/package/pie.scm b/src/guile/skribilo/package/pie.scm
index 2644cb7..1eba15a 100644
--- a/src/guile/skribilo/package/pie.scm
+++ b/src/guile/skribilo/package/pie.scm
@@ -33,7 +33,8 @@
   :autoload   (skribilo engine lout) (lout-illustration)
   :autoload   (ice-9 popen)          (open-output-pipe)
   :use-module (ice-9 optargs)
-  :export     (pie-sliceweight-value pie-remove-markup))
+  :export     (%ploticus-program %ploticus-debug?
+               pie-sliceweight-value pie-remove-markup))
 
 (fluid-set! current-reader %skribilo-module-reader)