revlist.c: introduce --left/right-only for unsymmetric picking

The existing "--cherry-pick" does not work with unsymmetric ranges
(A..B) for obvious reasons.

Introduce "--left-only" and "--right-only" which limit the output to
commits on the respective sides of a symmetric range (i.e. only "<"
resp. ">" commits as per "--left-right").

This is especially useful for things like

    git log --cherry-pick --right-only @{u}...

which is much more flexible (and descriptive) than

    git cherry @{u} | sed -ne 's/^+ //p'

and potentially more useful than

    git log --cherry-pick @{u}...

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/revision.c b/revision.c
index 7b9eaefae4ed03e994c2122453144b3c09591b9c..0681c7c309a81f9addef2a8d6bba7687dea637e7 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -733,6 +733,23 @@ static struct commit_list *collect_bottom_commits(struct commit_list *list)
        return bottom;
 }
 
+/* Assumes either left_only or right_only is set */
+static void limit_left_right(struct commit_list *list, struct rev_info *revs)
+{
+       struct commit_list *p;
+
+       for (p = list; p; p = p->next) {
+               struct commit *commit = p->item;
+
+               if (revs->right_only) {
+                       if (commit->object.flags & SYMMETRIC_LEFT)
+                               commit->object.flags |= SHOWN;
+               } else  /* revs->left_only is set */
+                       if (!(commit->object.flags & SYMMETRIC_LEFT))
+                               commit->object.flags |= SHOWN;
+       }
+}
+
 static int limit_list(struct rev_info *revs)
 {
        int slop = SLOP;
@@ -788,6 +805,9 @@ static int limit_list(struct rev_info *revs)
        if (revs->cherry_pick)
                cherry_pick_list(newlist, revs);
 
+       if (revs->left_only || revs->right_only)
+               limit_left_right(newlist, revs);
+
        if (bottom) {
                limit_to_ancestry(bottom, newlist);
                free_commit_list(bottom);
@@ -1263,6 +1283,10 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->boundary = 1;
        } else if (!strcmp(arg, "--left-right")) {
                revs->left_right = 1;
+       } else if (!strcmp(arg, "--left-only")) {
+               revs->left_only = 1;
+       } else if (!strcmp(arg, "--right-only")) {
+               revs->right_only = 1;
        } else if (!strcmp(arg, "--count")) {
                revs->count = 1;
        } else if (!strcmp(arg, "--cherry-pick")) {

diff --git a/revision.h b/revision.h
index 05659c64acd7fe8eb7be011cee6174e397e57baf..d2ffde1ce67a555ec6ac8b00b3b225a7bdad2319 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -59,6 +59,8 @@ struct rev_info {
                        boundary:2,
                        count:1,
                        left_right:1,
+                       left_only:1,
+                       right_only:1,
                        rewrite_parents:1,
                        print_parents:1,
                        show_source:1,