#include "cache.h"
#include "remote.h"
#include "refs.h"
+#include "commit.h"
+#include "diff.h"
+#include "revision.h"
static struct refspec s_tag_refspec = {
0,
}
return 1;
}
+
+/*
+ * Return true if there is anything to report, otherwise false.
+ */
+int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
+{
+ unsigned char sha1[20];
+ struct commit *ours, *theirs;
+ char symmetric[84];
+ struct rev_info revs;
+ const char *rev_argv[10], *base;
+ int rev_argc;
+
+ /*
+ * Nothing to report unless we are marked to build on top of
+ * somebody else.
+ */
+ if (!branch ||
+ !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
+ return 0;
+
+ /*
+ * If what we used to build on no longer exists, there is
+ * nothing to report.
+ */
+ base = branch->merge[0]->dst;
+ if (!resolve_ref(base, sha1, 1, NULL))
+ return 0;
+ theirs = lookup_commit(sha1);
+ if (!theirs)
+ return 0;
+
+ if (!resolve_ref(branch->refname, sha1, 1, NULL))
+ return 0;
+ ours = lookup_commit(sha1);
+ if (!ours)
+ return 0;
+
+ /* are we the same? */
+ if (theirs == ours)
+ return 0;
+
+ /* Run "rev-list --left-right ours...theirs" internally... */
+ rev_argc = 0;
+ rev_argv[rev_argc++] = NULL;
+ rev_argv[rev_argc++] = "--left-right";
+ rev_argv[rev_argc++] = symmetric;
+ rev_argv[rev_argc++] = "--";
+ rev_argv[rev_argc] = NULL;
+
+ strcpy(symmetric, sha1_to_hex(ours->object.sha1));
+ strcpy(symmetric + 40, "...");
+ strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
+
+ init_revisions(&revs, NULL);
+ setup_revisions(rev_argc, rev_argv, &revs, NULL);
+ prepare_revision_walk(&revs);
+
+ /* ... and count the commits on each side. */
+ *num_ours = 0;
+ *num_theirs = 0;
+ while (1) {
+ struct commit *c = get_revision(&revs);
+ if (!c)
+ break;
+ if (c->object.flags & SYMMETRIC_LEFT)
+ (*num_ours)++;
+ else
+ (*num_theirs)++;
+ }
+
+ /* clear object flags smudged by the above traversal */
+ clear_commit_marks(ours, ALL_REV_FLAGS);
+ clear_commit_marks(theirs, ALL_REV_FLAGS);
+ return 1;
+}
+
+/*
+ * Return true when there is anything to report, otherwise false.
+ */
+int format_tracking_info(struct branch *branch, struct strbuf *sb)
+{
+ int num_ours, num_theirs;
+ const char *base, *remote_msg;
+
+ if (!stat_tracking_info(branch, &num_ours, &num_theirs))
+ return 0;
+
+ base = branch->merge[0]->dst;
+ if (!prefixcmp(base, "refs/remotes/")) {
+ remote_msg = " remote";
+ base += strlen("refs/remotes/");
+ } else {
+ remote_msg = "";
+ }
+ if (!num_theirs)
+ strbuf_addf(sb, "Your branch is ahead of the tracked%s branch '%s' "
+ "by %d commit%s.\n",
+ remote_msg, base,
+ num_ours, (num_ours == 1) ? "" : "s");
+ else if (!num_ours)
+ strbuf_addf(sb, "Your branch is behind the tracked%s branch '%s' "
+ "by %d commit%s,\n"
+ "and can be fast-forwarded.\n",
+ remote_msg, base,
+ num_theirs, (num_theirs == 1) ? "" : "s");
+ else
+ strbuf_addf(sb, "Your branch and the tracked%s branch '%s' "
+ "have diverged,\nand respectively "
+ "have %d and %d different commit(s) each.\n",
+ remote_msg, base,
+ num_ours, num_theirs);
+ return 1;
+}