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revision traversal: --children option

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This adds a new --children option to the revision machinery.  In addition
to the list of parents, child commits of each commit are computed and
stored as a decoration to each commit.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2008-04-03 02:12:06 -07:00
parent f43e2fd43b
commit f35f5603f4
2 changed files with 38 additions and 3 deletions
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40
revision.c
View file

@ -9,6 +9,7 @@
#include "grep.h"
#include "reflog-walk.h"
#include "patch-ids.h"
#include "decorate.h"
volatile show_early_output_fn_t show_early_output;
@ -1310,6 +1311,11 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
revs->no_walk = 0;
continue;
}
if (!strcmp(arg, "--children")) {
revs->children.name = "children";
revs->limited = 1;
continue;
}
opts = diff_opt_parse(&revs->diffopt, argv+i, argc-i);
if (opts > 0) {
@ -1395,10 +1401,31 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
if (revs->reverse && revs->reflog_info)
die("cannot combine --reverse with --walk-reflogs");
if (revs->parents && revs->children.name)
die("cannot combine --parents and --children");
return left;
}
static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
{
struct commit_list *l = xcalloc(1, sizeof(*l));
l->item = child;
l->next = add_decoration(&revs->children, &parent->object, l);
}
static void set_children(struct rev_info *revs)
{
struct commit_list *l;
for (l = revs->commits; l; l = l->next) {
struct commit *commit = l->item;
struct commit_list *p;
for (p = commit->parents; p; p = p->next)
add_child(revs, p->item, commit);
}
}
int prepare_revision_walk(struct rev_info *revs)
{
int nr = revs->pending.nr;
@ -1427,6 +1454,8 @@ int prepare_revision_walk(struct rev_info *revs)
return -1;
if (revs->topo_order)
sort_in_topological_order(&revs->commits, revs->lifo);
if (revs->children.name)
set_children(revs);
return 0;
}
@ -1504,6 +1533,11 @@ static int commit_match(struct commit *commit, struct rev_info *opt)
commit->buffer, strlen(commit->buffer));
}
static inline int want_ancestry(struct rev_info *revs)
{
return (revs->parents || revs->children.name);
}
enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
{
if (commit->object.flags & SHOWN)
@ -1524,13 +1558,13 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
/* Commit without changes? */
if (commit->object.flags & TREESAME) {
/* drop merges unless we want parenthood */
if (!revs->parents)
if (!want_ancestry(revs))
return commit_ignore;
/* non-merge - always ignore it */
if (!commit->parents || !commit->parents->next)
return commit_ignore;
}
if (revs->parents && rewrite_parents(revs, commit) < 0)
if (want_ancestry(revs) && rewrite_parents(revs, commit) < 0)
return commit_error;
}
return commit_show;

1
revision.h
View file

@ -98,6 +98,7 @@ struct rev_info {
struct diff_options pruning;
struct reflog_walk_info *reflog_info;
struct decoration children;
};
#define REV_TREE_SAME 0