Teach revision machinery about --reverse

The option --reverse reverses the order of the commits.

[jc: with comments on rev_info.reverse from Simon 'corecode' Schubert.]

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-rev-list.txt b/Documentation/git-rev-list.txt
index a996f6cb1e4e9e94dbf3ccfb383990267a1cb819..beb090651b62f45851edd89a2217d4208397cc92 100644 (file)
--- a/Documentation/git-rev-list.txt
+++ b/Documentation/git-rev-list.txt
@@ -27,6 +27,7 @@ SYNOPSIS
             [ \--pretty | \--header ]
             [ \--bisect ]
             [ \--merge ]
+            [ \--reverse ]
             [ \--walk-reflogs ]
             <commit>... [ \-- <paths>... ]
 
@@ -266,6 +267,10 @@ By default, the commits are shown in reverse chronological order.
        parent comes before all of its children, but otherwise things
        are still ordered in the commit timestamp order.
 
+--reverse::
+
+       Output the commits in reverse order.
+
 Object Traversal
 ~~~~~~~~~~~~~~~~
 

diff --git a/revision.c b/revision.c
index ebd025064c82a3f6190a83e808e8bcf73478dacc..6726f736ed7b487e0f11dc5295ffb9a186327ce3 100644 (file)
--- a/revision.c
+++ b/revision.c
@@ -1057,6 +1057,10 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                                        git_log_output_encoding = "";
                                continue;
                        }
+                       if (!strcmp(arg, "--reverse")) {
+                               revs->reverse ^= 1;
+                               continue;
+                       }
 
                        opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
                        if (opts > 0) {
@@ -1285,6 +1289,40 @@ struct commit *get_revision(struct rev_info *revs)
 {
        struct commit *c = NULL;
 
+       if (revs->reverse) {
+               struct commit_list *list;
+
+               /*
+                * rev_info.reverse is used to note the fact that we
+                * want to output the list of revisions in reverse
+                * order.  To accomplish this goal, reverse can have
+                * different values:
+                *
+                *  0  do nothing
+                *  1  reverse the list
+                *  2  internal use:  we have already obtained and
+                *     reversed the list, now we only need to yield
+                *     its items.
+                */
+
+               if (revs->reverse == 1) {
+                       revs->reverse = 0;
+                       list = NULL;
+                       while ((c = get_revision(revs)))
+                               commit_list_insert(c, &list);
+                       revs->commits = list;
+                       revs->reverse = 2;
+               }
+
+               if (!revs->commits)
+                       return NULL;
+               c = revs->commits->item;
+               list = revs->commits->next;
+               free(revs->commits);
+               revs->commits = list;
+               return c;
+       }
+
        if (0 < revs->skip_count) {
                while ((c = get_revision_1(revs)) != NULL) {
                        if (revs->skip_count-- <= 0)

diff --git a/revision.h b/revision.h
index d93481f68f53a657fe4b174e4a12777efe6a74bb..5fec1846f366f1aadabc6f57edcfd17828afa8ee 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -42,7 +42,8 @@ struct rev_info {
                        unpacked:1, /* see also ignore_packed below */
                        boundary:1,
                        left_right:1,
-                       parents:1;
+                       parents:1,
+                       reverse:2;
 
        /* Diff flags */
        unsigned int    diff:1,