[PATCH 22/25] list-files: only do diff that is actually useful

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

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 builtin/list-files.c | 12 ++++++++++++
 wt-status.c          |  8 ++++++++
 wt-status.h          |  2 ++
 3 files changed, 22 insertions(+)

diff --git a/builtin/list-files.c b/builtin/list-files.c
index 228c39b..fc9c8d4 100644
--- a/builtin/list-files.c
+++ b/builtin/list-files.c
@@ -365,6 +365,10 @@ static void wt_status_populate(struct item_list *result,
 	if (show_ignored)
 		ws.show_ignored_files = 1;
 	ws.no_rename = 1;
+	ws.show_index_changes = show_unmerged || show_added ||
+		show_modified || show_deleted;
+	ws.show_worktree_changes = show_unmerged || show_wt_added ||
+		show_wt_modified || show_wt_deleted;
 	ws.relative_paths = 0;
 	ws.use_color = 0;
 	ws.fp = NULL;
@@ -538,6 +542,14 @@ int cmd_list_files(int argc, const char **argv, const char *cmd_prefix)
 	if (!show_cached && !show_untracked && !show_ignored &&
 	    !show_unmerged && !show_changed)
 		show_cached = 1;
+	if (show_unmerged) {
+		int i;
+		for (i = 0; i < the_index.cache_nr; i++)
+			if (ce_stage(the_index.cache[i]))
+				break;
+		if (i == the_index.cache_nr)
+			show_unmerged = 0;
+	}
 
 	if (want_color(use_color))
 		parse_ls_color();
diff --git a/wt-status.c b/wt-status.c
index ba9b56c..ce149b9 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -126,6 +126,8 @@ void wt_status_prepare(struct wt_status *s)
 	memcpy(s->color_palette, default_wt_status_colors,
 	       sizeof(default_wt_status_colors));
 	s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
+	s->show_index_changes = 1;
+	s->show_worktree_changes = 1;
 	s->use_color = -1;
 	s->relative_paths = 1;
 	s->branch = resolve_refdup("HEAD", 0, sha1, NULL);
@@ -493,6 +495,9 @@ static void wt_status_collect_changes_worktree(struct wt_status *s)
 {
 	struct rev_info rev;
 
+	if (!s->show_worktree_changes)
+		return;
+
 	init_revisions(&rev, NULL);
 	setup_revisions(0, NULL, &rev, NULL);
 	rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
@@ -514,6 +519,9 @@ static void wt_status_collect_changes_index(struct wt_status *s)
 	struct rev_info rev;
 	struct setup_revision_opt opt;
 
+	if (!s->show_index_changes)
+		return;
+
 	init_revisions(&rev, NULL);
 	memset(&opt, 0, sizeof(opt));
 	opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
diff --git a/wt-status.h b/wt-status.h
index dc94f35..1d7ad3a 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -57,6 +57,8 @@ struct wt_status {
 	int show_ignored_files;
 	int no_rename;
 	enum untracked_status_type show_untracked_files;
+	int show_index_changes;
+	int show_worktree_changes;
 	const char *ignore_submodule_arg;
 	char color_palette[WT_STATUS_MAXSLOT][COLOR_MAXLEN];
 	unsigned colopts;
-- 
2.3.0.rc1.137.g477eb31