Multiple cylinder support for JDiveLog import

Support for multiple cylinders and gas change events when Importing
JDiveLog logs to Subsurface. This is tested with manually crafted data
and not real data (originating from dive computer).

NOTE: Subsurface does not handle importing multiple cylinders
correctly but imports only the first cylinder. However, manually
converting data to a file and opening that in Subsurface works
correctly.
 (xsltproc jdivelog2subsurface.xslt jdivelog-gas.jlb > gas.xml)

Some minor tweaking on importing JDiveLog specific fields to notes
fields in Subsurface is also included.

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

xslt/jdivelog2subsurface.xslt

@@ -66,13 +66,10 @@
 
       <notes>
         <xsl:if test="DiveActivity != ''">
-          <xsl:value-of select="DiveActivity"/>
+Diveactivity: <xsl:value-of select="DiveActivity"/>
         </xsl:if>
-        <xsl:if test="Comment != ''">
-          <xsl:if test="DiveActivity != ''">
-            <xsl:value-of select="': '"/>
-          </xsl:if>
-          <xsl:value-of select="Comment"/>
+        <xsl:if test="DiveType != ''">
+Divetype: <xsl:value-of select="DiveType"/>
         </xsl:if>
         <xsl:if test="Equipment/Visibility != ''">
 Visibility: <xsl:value-of select="Equipment/Visibility"/>
@@ -86,41 +83,51 @@ Gloves: <xsl:value-of select="Equipment/Gloves"/>
         <xsl:if test="Equipment/Weight != ''">
 Weight: <xsl:value-of select="Equipment/Weight"/>
         </xsl:if>
+        <xsl:if test="Comment != ''">
+Comment: <xsl:value-of select="Comment"/>
+        </xsl:if>
       </notes>
 
       <!-- cylinder -->
-      <xsl:variable name="o2">
-        <xsl:choose>
-          <xsl:when test="DIVE/GASES/MIX/O2 != ''">
-            <xsl:value-of select="concat(DIVE/GASES/MIX/O2*100, '%')"/>
-          </xsl:when>
-          <xsl:otherwise>21.0%</xsl:otherwise>
-        </xsl:choose>
-      </xsl:variable>
-      <xsl:variable name="size">
-        <xsl:choose>
-          <xsl:when test="Equipment/Tanks/Tank/MIX/TANK/TANKVOLUME != ''">
-            <xsl:value-of select="concat(Equipment/Tanks/Tank/MIX/TANK/TANKVOLUME * 1000, ' l')"/>
-          </xsl:when>
-          <xsl:otherwise>0 l</xsl:otherwise>
-        </xsl:choose>
-      </xsl:variable>
-      <xsl:variable name="start">
-        <xsl:variable name="number" select="Equipment/Tanks/Tank/MIX/TANK/PSTART"/>
-        <xsl:call-template name="pressure">
-          <xsl:with-param name="number" select="$number"/>
-          <xsl:with-param name="units" select="$units"/>
-        </xsl:call-template>
-      </xsl:variable>
-      <xsl:variable name="end">
-        <xsl:variable name="number" select="Equipment/Tanks/Tank/MIX/TANK/PEND"/>
-        <xsl:call-template name="pressure">
-          <xsl:with-param name="number" select="$number"/>
-          <xsl:with-param name="units" select="$units"/>
-        </xsl:call-template>
-      </xsl:variable>
-
-      <cylinder o2="{$o2}" size="{$size}" start="{$start}" end="{$end}"/>
+      <xsl:for-each select="Equipment/Tanks/Tank">
+        <cylinder>
+          <xsl:attribute name="o2">
+            <xsl:choose>
+              <xsl:when test="MIX/O2 != ''">
+                <xsl:value-of select="concat(MIX/O2*100, '%')"/>
+              </xsl:when>
+              <xsl:otherwise>21.0%</xsl:otherwise>
+            </xsl:choose>
+          </xsl:attribute>
+          <xsl:if test="MIX/HE != '0.0'">
+            <xsl:attribute name="he">
+              <xsl:value-of select="concat(MIX/HE*100, '%')"/>
+            </xsl:attribute>
+          </xsl:if>
+          <xsl:attribute name="size">
+            <xsl:choose>
+              <xsl:when test="MIX/TANK/TANKVOLUME != ''">
+                <xsl:value-of select="concat(MIX/TANK/TANKVOLUME * 1000, ' l')"/>
+              </xsl:when>
+              <xsl:otherwise>0 l</xsl:otherwise>
+            </xsl:choose>
+          </xsl:attribute>
+          <xsl:attribute name="start">
+            <xsl:variable name="number" select="MIX/TANK/PSTART"/>
+            <xsl:call-template name="pressure">
+              <xsl:with-param name="number" select="$number"/>
+              <xsl:with-param name="units" select="$units"/>
+            </xsl:call-template>
+          </xsl:attribute>
+          <xsl:attribute name="end">
+            <xsl:variable name="number" select="MIX/TANK/PEND"/>
+            <xsl:call-template name="pressure">
+              <xsl:with-param name="number" select="$number"/>
+              <xsl:with-param name="units" select="$units"/>
+            </xsl:call-template>
+          </xsl:attribute>
+        </cylinder>
+      </xsl:for-each>
       <!-- end cylinder -->
 
       <!-- DELTA is the sample interval -->
@@ -156,6 +163,22 @@ Weight: <xsl:value-of select="Equipment/Weight"/>
       </xsl:for-each>
       <!-- end events -->
 
+      <!-- gas change -->
+      <xsl:for-each select="DIVE/SAMPLES/SWITCH">
+        <event name="gaschange">
+          <xsl:attribute name="time">
+            <xsl:call-template name="timeConvert">
+              <xsl:with-param name="timeSec" select="count(preceding-sibling::D) * $delta"/>
+              <xsl:with-param name="units" select="'si'"/>
+            </xsl:call-template>
+          </xsl:attribute>
+          <xsl:attribute name="value">
+            <xsl:value-of select="ancestor::DIVE/GASES/MIX[MIXNAME=current()]/O2 * 100" />
+          </xsl:attribute>
+        </event>
+      </xsl:for-each>
+      <!-- end gas change -->
+
       <!-- dive sample - all the depth and temp readings -->
       <xsl:for-each select="DIVE/SAMPLES/D">
         <xsl:variable name="timeSec" select="(position() - 1) * $delta"/>