[RFC PATCH v3 8/8] --sparse for porcelains

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

This series is useless until now because no one would use read-tree to
checkout. At least with this, you can really use/test the series.
Porcelain design was originally "if you have .git/info/sparse,
porcelains will use it, if you don't like that, remove
.git/info/sparse" while plumblings have an option to
enable/disable this feature.

And I still like that behavior. How about we enable sparse checkout
by default for porcelains and make a config option to disable it?

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin-checkout.c |    4 ++++
 builtin-merge.c    |    5 ++++-
 git-pull.sh        |    6 +++++-
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/builtin-checkout.c b/builtin-checkout.c
index 446cac7..cec21ab 100644
--- a/builtin-checkout.c
+++ b/builtin-checkout.c
@@ -30,6 +30,7 @@ struct checkout_opts {
 	int force;
 	int writeout_stage;
 	int writeout_error;
+	int apply_sparse;
 
 	const char *new_branch;
 	int new_branch_log;
@@ -402,6 +403,7 @@ static int merge_working_tree(struct checkout_opts *opts,
 		topts.dir = xcalloc(1, sizeof(*topts.dir));
 		topts.dir->flags |= DIR_SHOW_IGNORED;
 		topts.dir->exclude_per_dir = ".gitignore";
+		topts.apply_sparse = opts->apply_sparse;
 		tree = parse_tree_indirect(old->commit->object.sha1);
 		init_tree_desc(&trees[0], tree->buffer, tree->size);
 		tree = parse_tree_indirect(new->commit->object.sha1);
@@ -594,6 +596,8 @@ int cmd_checkout(int argc, const char **argv, const char *prefix)
 		OPT_BOOLEAN('m', "merge", &opts.merge, "merge"),
 		OPT_STRING(0, "conflict", &conflict_style, "style",
 			   "conflict style (merge or diff3)"),
+		OPT_SET_INT(0, "sparse", &opts.apply_sparse,
+			    "apply sparse checkout filter", 1),
 		OPT_END(),
 	};
 	int has_dash_dash;
diff --git a/builtin-merge.c b/builtin-merge.c
index 0b12fb3..c14b91d 100644
--- a/builtin-merge.c
+++ b/builtin-merge.c
@@ -43,7 +43,7 @@ static const char * const builtin_merge_usage[] = {
 
 static int show_diffstat = 1, option_log, squash;
 static int option_commit = 1, allow_fast_forward = 1;
-static int allow_trivial = 1, have_message;
+static int allow_trivial = 1, have_message, apply_sparse;
 static struct strbuf merge_msg;
 static struct commit_list *remoteheads;
 static unsigned char head[20], stash[20];
@@ -172,6 +172,7 @@ static struct option builtin_merge_options[] = {
 	OPT_CALLBACK('m', "message", &merge_msg, "message",
 		"message to be used for the merge commit (if any)",
 		option_parse_message),
+	OPT_SET_INT(0, "sparse", &apply_sparse, "apply sparse checkout filter", 1),
 	OPT__VERBOSITY(&verbosity),
 	OPT_END()
 };
@@ -494,6 +495,7 @@ static int read_tree_trivial(unsigned char *common, unsigned char *head,
 	opts.verbose_update = 1;
 	opts.trivial_merges_only = 1;
 	opts.merge = 1;
+	opts.apply_sparse = apply_sparse;
 	trees[nr_trees] = parse_tree_indirect(common);
 	if (!trees[nr_trees++])
 		return -1;
@@ -646,6 +648,7 @@ static int checkout_fast_forward(unsigned char *head, unsigned char *remote)
 	opts.verbose_update = 1;
 	opts.merge = 1;
 	opts.fn = twoway_merge;
+	opts.apply_sparse = apply_sparse;
 
 	trees[nr_trees] = parse_tree_indirect(head);
 	if (!trees[nr_trees++])
diff --git a/git-pull.sh b/git-pull.sh
index 0f24182..ba583bf 100755
--- a/git-pull.sh
+++ b/git-pull.sh
@@ -20,6 +20,7 @@ strategy_args= diffstat= no_commit= squash= no_ff= log_arg= verbosity=
 curr_branch=$(git symbolic-ref -q HEAD)
 curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
 rebase=$(git config --bool branch.$curr_branch_short.rebase)
+sparse=
 while :
 do
 	case "$1" in
@@ -65,6 +66,9 @@ do
 	--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 		rebase=false
 		;;
+	--sparse)
+		sparse=--sparse
+		;;
 	-h|--h|--he|--hel|--help)
 		usage
 		;;
@@ -201,5 +205,5 @@ merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 test true = "$rebase" &&
 	exec git-rebase $diffstat $strategy_args --onto $merge_head \
 	${oldremoteref:-$merge_head}
-exec git-merge $diffstat $no_commit $squash $no_ff $log_arg $strategy_args \
+exec git-merge $sparse $diffstat $no_commit $squash $no_ff $log_arg $strategy_args \
 	"$merge_name" HEAD $merge_head $verbosity
-- 
1.6.3.GIT