Initial implementation of git save format

This saves the dive data into a git object repository instead of a
single XML file.

We create a git object tree with each dive as a separate file,
hierarchically by trip and date.

NOTE 1: This largely duplicates the XML saving code, because trying to
share it seemed just too painful: the logic is very similar, but the
details of the actual strings end up differing sufficiently that there
are tons of trivial differences.

The git save format is line-based with minimal quoting, while XML quotes
everything with either "<..\>" or using single quotes around attributes.

NOTE 2: You currently need a dummy "file" to save to, which points to
the real save location: the git repository and branch to be used.  We
should make this a config thing, but for testing, do something like
this:

	echo git /home/torvalds/scuba:linus > git-test

to create that git information file, and when you use "Save To" and
specify "git-test" as the file to save to, subsurface will use the new
git save logic to save to the branch "linus" in the repository found at
"/home/torvalds/scuba".

NOTE 3: The git save format uses just the git object directory, it does
*not* check out the result in any git working tree or index.  So after
you do a save, you can do

     git log -p linus

to see what actually happened in that branch, but it will not affect any
actual checked-out state in the repository.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/dive.c b/dive.c
index 0552c31da..a402f9932 100644
--- a/dive.c
+++ b/dive.c
@@ -224,6 +224,30 @@ void copy_events(struct dive *s, struct dive *d)
 	}
 }
 
+int nr_cylinders(struct dive *dive)
+{
+	int nr;
+
+	for (nr = MAX_CYLINDERS; nr; --nr) {
+		cylinder_t *cylinder = dive->cylinder + nr - 1;
+		if (!cylinder_nodata(cylinder))
+			break;
+	}
+	return nr;
+}
+
+int nr_weightsystems(struct dive *dive)
+{
+	int nr;
+
+	for (nr = MAX_WEIGHTSYSTEMS; nr; --nr) {
+		weightsystem_t *ws = dive->weightsystem + nr - 1;
+		if (!weightsystem_none(ws))
+			break;
+	}
+	return nr;
+}
+
 void copy_cylinders(struct dive *s, struct dive *d)
 {
 	int i;