[PATCH v4 4/8] status: per-file data collection for --porcelain=v2

[Jeff Hostetler <git@jeffhostetler.com>]

From: Jeff Hostetler <jeffhost@microsoft.com>

The output of `git status --porcelain` leaves out many details
about the current status that clients might like to have.  This
can force them to be less efficient as they may need to launch
secondary commands (and try to match the logic within git) to
accumulate this extra information.  For example, a GUI IDE might
want the file mode to display the correct icon for a changed
item (without having to stat it afterwards).

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Jeff Hostetler <git@jeffhostetler.com>
---
 builtin/commit.c |  3 +++
 wt-status.c      | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 wt-status.h      |  4 ++++
 3 files changed, 69 insertions(+), 1 deletion(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index c3ae2c3..93ce28c 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -153,6 +153,8 @@ static int opt_parse_porcelain(const struct option *opt, const char *arg, int un
 		*value = STATUS_FORMAT_PORCELAIN;
 	else if (!strcmp(arg, "v1") || !strcmp(arg,"1"))
 		*value = STATUS_FORMAT_PORCELAIN;
+	else if (!strcmp(arg, "v2") || !strcmp(arg, "2"))
+		*value = STATUS_FORMAT_PORCELAIN_V2;
 	else
 		die("unsupported porcelain version '%s'", arg);
 
@@ -1104,6 +1106,7 @@ static struct status_deferred_config {
 static void finalize_deferred_config(struct wt_status *s)
 {
 	int use_deferred_config = (status_format != STATUS_FORMAT_PORCELAIN &&
+				   status_format != STATUS_FORMAT_PORCELAIN_V2 &&
 				   !s->null_termination);
 
 	if (s->null_termination) {
diff --git a/wt-status.c b/wt-status.c
index a9031e4..15d3349 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -434,6 +434,31 @@ static void wt_status_collect_changed_cb(struct diff_queue_struct *q,
 		if (S_ISGITLINK(p->two->mode))
 			d->new_submodule_commits = !!oidcmp(&p->one->oid,
 							    &p->two->oid);
+
+		switch (p->status) {
+		case DIFF_STATUS_ADDED:
+			die("BUG: worktree status add???");
+			break;
+
+		case DIFF_STATUS_DELETED:
+			d->mode_index = p->one->mode;
+			oidcpy(&d->oid_index, &p->one->oid);
+			/* mode_worktree is zero for a delete. */
+			break;
+
+		case DIFF_STATUS_MODIFIED:
+		case DIFF_STATUS_TYPE_CHANGED:
+		case DIFF_STATUS_UNMERGED:
+			d->mode_index = p->one->mode;
+			d->mode_worktree = p->two->mode;
+			oidcpy(&d->oid_index, &p->one->oid);
+			break;
+
+		case DIFF_STATUS_UNKNOWN:
+			die("BUG: worktree status unknown???");
+			break;
+		}
+
 	}
 }
 
@@ -479,12 +504,36 @@ static void wt_status_collect_updated_cb(struct diff_queue_struct *q,
 		if (!d->index_status)
 			d->index_status = p->status;
 		switch (p->status) {
+		case DIFF_STATUS_ADDED:
+			/* Leave {mode,oid}_head zero for an add. */
+			d->mode_index = p->two->mode;
+			oidcpy(&d->oid_index, &p->two->oid);
+			break;
+		case DIFF_STATUS_DELETED:
+			d->mode_head = p->one->mode;
+			oidcpy(&d->oid_head, &p->one->oid);
+			/* Leave {mode,oid}_index zero for a delete. */
+			break;
+			
 		case DIFF_STATUS_COPIED:
 		case DIFF_STATUS_RENAMED:
 			d->head_path = xstrdup(p->one->path);
+			d->score = p->score * 100 / MAX_SCORE;
+			/* fallthru */
+		case DIFF_STATUS_MODIFIED:
+		case DIFF_STATUS_TYPE_CHANGED:
+			d->mode_head = p->one->mode;
+			d->mode_index = p->two->mode;
+			oidcpy(&d->oid_head, &p->one->oid);
+			oidcpy(&d->oid_index, &p->two->oid);
 			break;
 		case DIFF_STATUS_UNMERGED:
 			d->stagemask = unmerged_mask(p->two->path);
+			/*
+			 * Don't bother setting {mode,oid}_{head,index} since the print
+			 * code will output the stage values directly and not use the
+			 * values in these fields.
+			 */
 			break;
 		}
 	}
@@ -565,9 +614,18 @@ static void wt_status_collect_changes_initial(struct wt_status *s)
 		if (ce_stage(ce)) {
 			d->index_status = DIFF_STATUS_UNMERGED;
 			d->stagemask |= (1 << (ce_stage(ce) - 1));
+			/*
+			 * Don't bother setting {mode,oid}_{head,index} since the print
+			 * code will output the stage values directly and not use the
+			 * values in these fields.
+			 */
 		}
-		else
+		else {
 			d->index_status = DIFF_STATUS_ADDED;
+			/* Leave {mode,oid}_head zero for adds. */
+			d->mode_index = ce->ce_mode;
+			hashcpy(d->oid_index.hash, ce->sha1);
+		}
 	}
 }
 
@@ -1764,6 +1822,9 @@ void wt_status_print(struct wt_status *s)
 	case STATUS_FORMAT_PORCELAIN:
 		wt_porcelain_print(s);
 		break;
+	case STATUS_FORMAT_PORCELAIN_V2:
+		/* TODO */
+		break;
 	case STATUS_FORMAT_UNSPECIFIED:
 		die("BUG: finalize_deferred_config() should have been called");
 		break;
diff --git a/wt-status.h b/wt-status.h
index a859a12..89a6d43 100644
--- a/wt-status.h
+++ b/wt-status.h
@@ -38,6 +38,9 @@ struct wt_status_change_data {
 	int worktree_status;
 	int index_status;
 	int stagemask;
+	int score;
+	int mode_head, mode_index, mode_worktree;
+	struct object_id oid_head, oid_index;
 	char *head_path;
 	unsigned dirty_submodule       : 2;
 	unsigned new_submodule_commits : 1;
@@ -48,6 +51,7 @@ struct wt_status_change_data {
 	STATUS_FORMAT_LONG,
 	STATUS_FORMAT_SHORT,
 	STATUS_FORMAT_PORCELAIN,
+	STATUS_FORMAT_PORCELAIN_V2,
 
 	STATUS_FORMAT_UNSPECIFIED
  };
-- 
2.8.0.rc4.17.gac42084.dirty