wt-status: provide function to expose status for trees

The "wt-status" subsystem is responsible for printing status information
around the current state of the working tree. This most importantly
includes information around whether the working tree or the index have
any changes.

We're about to introduce a new command though where the changes in
neither of them are actually relevant to us. Instead, what we want is to
format the changes between two different trees. While it is a little bit
of a stretch to add this as functionality to _working tree_ status, it
doesn't make any sense to open-code this functionality, either.

Implement a new function `wt_status_collect_changes_trees()` that diffs
two trees and formats the status accordingly. This function is not yet
used, but will be in a subsequent commit.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/wt-status.c b/wt-status.c
index 8ffe6d3988fea26ef9ab464ef2619dd731b00431..b66edbfca6cf4c402779487014bece89997b342a 100644 (file)
--- a/wt-status.c
+++ b/wt-status.c
@@ -612,6 +612,30 @@ static void wt_status_collect_updated_cb(struct diff_queue_struct *q,
        }
 }
 
+void wt_status_collect_changes_trees(struct wt_status *s,
+                                    const struct object_id *old_treeish,
+                                    const struct object_id *new_treeish)
+{
+       struct diff_options opts = { 0 };
+
+       repo_diff_setup(s->repo, &opts);
+       opts.output_format = DIFF_FORMAT_CALLBACK;
+       opts.format_callback = wt_status_collect_updated_cb;
+       opts.format_callback_data = s;
+       opts.detect_rename = s->detect_rename >= 0 ? s->detect_rename : opts.detect_rename;
+       opts.rename_limit = s->rename_limit >= 0 ? s->rename_limit : opts.rename_limit;
+       opts.rename_score = s->rename_score >= 0 ? s->rename_score : opts.rename_score;
+       opts.flags.recursive = 1;
+       diff_setup_done(&opts);
+
+       diff_tree_oid(old_treeish, new_treeish, "", &opts);
+       diffcore_std(&opts);
+       diff_flush(&opts);
+       wt_status_get_state(s->repo, &s->state, 0);
+
+       diff_free(&opts);
+}
+
 static void wt_status_collect_changes_worktree(struct wt_status *s)
 {
        struct rev_info rev;

diff --git a/wt-status.h b/wt-status.h
index e40a27214a700d8a3d62ee67ee8ad5ec461887e1..924d7a5fa9927f344d2ae1f4367452d65f625914 100644 (file)
--- a/wt-status.h
+++ b/wt-status.h
@@ -153,6 +153,9 @@ void wt_status_add_cut_line(struct wt_status *s);
 void wt_status_prepare(struct repository *r, struct wt_status *s);
 void wt_status_print(struct wt_status *s);
 void wt_status_collect(struct wt_status *s);
+void wt_status_collect_changes_trees(struct wt_status *s,
+                                    const struct object_id *old_treeish,
+                                    const struct object_id *new_treeish);
 /*
  * Frees the buffers allocated by wt_status_collect.
  */