Use XSLT file to open JDiveLog logs

Open JDiveLog files by translating them to subsurface format using XSLT.
These files are identified by the name of the first element (JDiveLog)
and transform is applied to only these.

The XSLT feature is compiled in only if libxslt is installed. The
transformation files are installed globally in Linux under
/usr/share/subsurface/xslt. Windows and OSX still need appropriate Makefile
changes and testing.

Signed-off-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 52 insertions, 3 deletions

diff --git a/Makefile b/Makefile
index 20cbf8a57..1b1a31a8c 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,7 @@ CFLAGS=-Wall -Wno-pointer-sign -g
 INSTALL=install
 PKGCONFIG=pkg-config
 XML2CONFIG=xml2-config
+XSLCONFIG=xslt-config
 
 # these locations seem to work for SuSE and Fedora
 # prefix = $(HOME)
@@ -15,12 +16,14 @@ DESKTOPDIR = $(DATADIR)/applications
 ICONPATH = $(DATADIR)/icons/hicolor
 ICONDIR = $(ICONPATH)/scalable/apps
 MANDIR = $(DATADIR)/man/man1
+XSLTDIR = $(DATADIR)/subsurface/xslt
 gtk_update_icon_cache = gtk-update-icon-cache -f -t $(ICONPATH)
 
 NAME = subsurface
 ICONFILE = $(NAME).svg
 DESKTOPFILE = $(NAME).desktop
 MANFILES = $(NAME).1
+XSLTFILES = xslt/*.xslt
 
 MACOSXINSTALL = /Applications/Subsurface.app
 MACOSXFILES = packaging/macosx
@@ -77,7 +80,7 @@ LIBGTK = $(shell $(PKGCONFIG) --libs gtk+-2.0 glib-2.0 gconf-2.0)
 LIBDIVECOMPUTERCFLAGS = $(LIBDIVECOMPUTERINCLUDES)
 LIBDIVECOMPUTER = $(LIBDIVECOMPUTERARCHIVE) $(LIBUSB)
 
-LIBS = $(LIBXML2) $(LIBGTK) $(LIBDIVECOMPUTER) -lpthread
+LIBS = $(LIBXML2) $(LIBXSLT) $(LIBGTK) $(LIBDIVECOMPUTER) -lpthread
 
 OBJS =	main.o dive.o profile.o info.o equipment.o divelist.o \
 	parse-xml.o save-xml.o libdivecomputer.o print.o uemis.o \
@@ -98,12 +101,26 @@ install: $(NAME)
 	fi
 	$(INSTALL) -d -m 755 $(MANDIR)
 	$(INSTALL) -m 644 $(MANFILES) $(MANDIR)
+	@-if test ! -z "$(XSLT)"; then \
+		$(INSTALL) -d -m 755 $(DATADIR)/subsurface; \
+		$(INSTALL) -d -m 755 $(XSLTDIR); \
+		$(INSTALL) -m 644 $(XSLTFILES) $(XSLTDIR); \
+	fi
 
 LIBXML2 = $(shell $(XML2CONFIG) --libs)
+LIBXSLT = $(shell $(XSLCONFIG) --libs)
 XML2CFLAGS = $(shell $(XML2CONFIG) --cflags)
 GLIB2CFLAGS = $(shell $(PKGCONFIG) --cflags glib-2.0)
 GCONF2CFLAGS =  $(shell $(PKGCONFIG) --cflags gconf-2.0)
 GTK2CFLAGS = $(shell $(PKGCONFIG) --cflags gtk+-2.0)
+CFLAGS += $(shell $(XSLCONFIG) --cflags)
+
+ifneq ($(strip $(LIBXSLT)),)
+	# We still need proper paths and install options for OSX and Windows
+	ifeq ($(shell sh -c 'uname -s 2>/dev/null || echo not'),Linux)
+		XSLT=-DXSLT='"$(XSLTDIR)"'
+	endif
+endif
 
 install-macosx: $(NAME)
 	$(INSTALL) -d -m 755 $(MACOSXINSTALL)/Contents/Resources
@@ -116,7 +133,7 @@ install-macosx: $(NAME)
 	$(INSTALL) $(MACOSXFILES)/Subsurface.icns $(MACOSXINSTALL)/Contents/Resources/
 
 parse-xml.o: parse-xml.c dive.h
-	$(CC) $(CFLAGS) $(GLIB2CFLAGS) -c $(XML2CFLAGS)  parse-xml.c
+	$(CC) $(CFLAGS) $(GLIB2CFLAGS) -c $(XML2CFLAGS) $(XSLT) parse-xml.c
 
 save-xml.o: save-xml.c dive.h
 	$(CC) $(CFLAGS) $(GLIB2CFLAGS) -c save-xml.c
diff --git a/dive.h b/dive.h
index cf11e1f89..36a406c25 100644
--- a/dive.h
+++ b/dive.h
@@ -5,6 +5,7 @@
 #include <time.h>
 
 #include <glib.h>
+#include <libxml/tree.h>
 
 /*
  * Some silly typedefs to make our units very explicit.
@@ -253,6 +254,10 @@ extern void parse_xml_init(void);
 extern void parse_xml_file(const char *filename, GError **error);
 extern void set_filename(const char *filename);
 
+#ifdef XSLT
+extern xmlDoc *test_xslt_transforms(xmlDoc *doc);
+#endif
+
 extern void show_dive_info(struct dive *);
 extern void flush_dive_info_changes(struct dive *);
 
diff --git a/packaging/debian/control b/packaging/debian/control
index 7c2aa36e2..b90fe1cbe 100644
--- a/packaging/debian/control
+++ b/packaging/debian/control
@@ -2,7 +2,8 @@ Source: subsurface
 Priority: optional
 Maintainer: Roland Dreier <roland@digitalvampire.org>
 Build-Depends: autoconf, automake, libtool, debhelper (>= 8), dh-autoreconf,
- pkg-config, libgtk2.0-dev, libgconf2-dev, libxml2-dev, libdivecomputer-dev
+ pkg-config, libgtk2.0-dev, libgconf2-dev, libxml2-dev, libdivecomputer-dev,
+ libxslt-dev
 Standards-Version: 3.9.2
 Section: utils
 Homepage: http://subsurface.hohndel.org
diff --git a/parse-xml.c b/parse-xml.c
index 5eabc353c..ddf93a4b1 100644
--- a/parse-xml.c
+++ b/parse-xml.c
@@ -7,6 +7,9 @@
 #include <time.h>
 #include <libxml/parser.h>
 #include <libxml/tree.h>
+#ifdef XSLT
+#include <libxslt/transform.h>
+#endif
 
 #include "dive.h"
 #include "uemis.h"
@@ -1466,6 +1469,9 @@ void parse_xml_file(const char *filename, GError **error)
 	set_filename(filename);
 	reset_all();
 	dive_start();
+#ifdef XSLT
+	doc = test_xslt_transforms(doc);
+#endif
 	traverse(xmlDocGetRootElement(doc));
 	dive_end();
 	xmlFreeDoc(doc);
@@ -1476,3 +1482,23 @@ void parse_xml_init(void)
 {
 	LIBXML_TEST_VERSION
 }
+
+#ifdef XSLT
+xmlDoc *test_xslt_transforms(xmlDoc *doc)
+{
+	xmlDoc *transformed;
+	xsltStylesheetPtr xslt = NULL;
+	xmlNode *root_element = xmlDocGetRootElement(doc);
+	if (strcasecmp(root_element->name, "JDiveLog") == 0) {
+		xmlSubstituteEntitiesDefault(1);
+		xslt = xsltParseStylesheetFile(XSLT G_DIR_SEPARATOR_S "jdivelog2subsurface.xslt");
+		if (xslt == NULL)
+			return doc;
+		transformed = xsltApplyStylesheet(xslt, doc, NULL);
+		xmlFreeDoc(doc);
+		xsltFreeStylesheet(xslt);
+		return transformed;
+	}
+	return doc;
+}
+#endif