[beast: 178/210] DOCS: add html-docs rule to build docs on demand

[Tim Janik <timj src gnome org>]

commit 4ac0376bc25a57c43a49a70c91c73499ff44e463
Author: Tim Janik <timj gnu org>
Date:   Tue Jun 18 22:26:15 2013 +0200

    DOCS: add html-docs rule to build docs on demand

 docs/Makefile.am |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
---
diff --git a/docs/Makefile.am b/docs/Makefile.am
index 21d42cf..69e27bd 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -16,6 +16,21 @@ DOC_VERSION = $(or $(DSC_VERSION), $(PRJ_VERSION))
 
 # == html/ build rules ==
 include Makefile.doxygen
+git_index_file = $(shell test ! -x $(top_srcdir)/.git/ || echo $(top_srcdir)/.git/index)
+html/doc-version: @INGIT@ $(git_index_file)    # conditionally rebuild, depending on HEAD changes
+       $(AM_V_GEN)
+       $(Q) test -e $@ && test "`cat $ `" = "$(DOC_VERSION)" \
+       || $(MAKE) $(AM_MAKEFLAGS) --no-print-directory html-docs
+       $(Q) rm -f $@ && echo "$(DOC_VERSION)" > $@
+clean-html-docs:
+       rm -rf html/
+clean-local: @INGIT@ clean-html-docs doxygen-clean
+EXTRA_DIST += html
+html-docs: doxygen-check
+       $(Q) rm -rf html/
+       $(Q) $(MAKE) $(AM_MAKEFLAGS) --no-print-directory build-docs DOXYGEN_GRAPHICS=NO DOC_TARGET=html
+       $(Q) echo "$(DOC_VERSION)" > html/doc-version
+.PHONY: html-docs
 
 # == Doxygen Build Rules ==
 HTMLMAN_FILES          = imports/beast.1.html imports/bse.5.html imports/bsescm.1.html 
imports/bsewavetool.1.html imports/sfidl.1.html