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-rw-r--r--builtin-log.c5
-rw-r--r--diff.c2
-rw-r--r--diff.h1
-rw-r--r--revision.c4
-rw-r--r--tree-diff.c59
5 files changed, 70 insertions, 1 deletions
diff --git a/builtin-log.c b/builtin-log.c
index b9035ab..073a2a1 100644
--- a/builtin-log.c
+++ b/builtin-log.c
@@ -58,6 +58,11 @@ static void cmd_log_init(int argc, const char **argv, const char *prefix,
argc = setup_revisions(argc, argv, rev, "HEAD");
if (rev->diffopt.pickaxe || rev->diffopt.filter)
rev->always_show_header = 0;
+ if (rev->diffopt.follow_renames) {
+ rev->always_show_header = 0;
+ if (rev->diffopt.nr_paths != 1)
+ usage("git logs can only follow renames on one pathname at a time");
+ }
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
if (!strcmp(arg, "--decorate")) {
diff --git a/diff.c b/diff.c
index 4aa9bbc..9938969 100644
--- a/diff.c
+++ b/diff.c
@@ -2210,6 +2210,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
}
else if (!strcmp(arg, "--find-copies-harder"))
options->find_copies_harder = 1;
+ else if (!strcmp(arg, "--follow"))
+ options->follow_renames = 1;
else if (!strcmp(arg, "--abbrev"))
options->abbrev = DEFAULT_ABBREV;
else if (!prefixcmp(arg, "--abbrev=")) {
diff --git a/diff.h b/diff.h
index a7ee6d8..9fd6d44 100644
--- a/diff.h
+++ b/diff.h
@@ -55,6 +55,7 @@ struct diff_options {
full_index:1,
silent_on_remove:1,
find_copies_harder:1,
+ follow_renames:1,
color_diff:1,
color_diff_words:1,
has_changes:1,
diff --git a/revision.c b/revision.c
index 1f4590b..7834bb1 100644
--- a/revision.c
+++ b/revision.c
@@ -1230,7 +1230,9 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
if (revs->prune_data) {
diff_tree_setup_paths(revs->prune_data, &revs->pruning);
- revs->prune_fn = try_to_simplify_commit;
+ /* Can't prune commits with rename following: the paths change.. */
+ if (!revs->diffopt.follow_renames)
+ revs->prune_fn = try_to_simplify_commit;
if (!revs->full_diff)
diff_tree_setup_paths(revs->prune_data, &revs->diffopt);
}
diff --git a/tree-diff.c b/tree-diff.c
index 852498e..42924e9 100644
--- a/tree-diff.c
+++ b/tree-diff.c
@@ -3,6 +3,7 @@
*/
#include "cache.h"
#include "diff.h"
+#include "diffcore.h"
#include "tree.h"
static char *malloc_base(const char *base, int baselen, const char *path, int pathlen)
@@ -290,6 +291,59 @@ int diff_tree(struct tree_desc *t1, struct tree_desc *t2, const char *base, stru
return 0;
}
+/*
+ * Does it look like the resulting diff might be due to a rename?
+ * - single entry
+ * - not a valid previous file
+ */
+static inline int diff_might_be_rename(void)
+{
+ return diff_queued_diff.nr == 1 &&
+ !DIFF_FILE_VALID(diff_queued_diff.queue[0]->one);
+}
+
+static void try_to_follow_renames(struct tree_desc *t1, struct tree_desc *t2, const char *base, struct diff_options *opt)
+{
+ struct diff_options diff_opts;
+ const char *paths[2];
+ int i;
+
+ diff_setup(&diff_opts);
+ diff_opts.recursive = 1;
+ diff_opts.detect_rename = DIFF_DETECT_RENAME;
+ diff_opts.output_format = DIFF_FORMAT_NO_OUTPUT;
+ diff_opts.single_follow = opt->paths[0];
+ paths[0] = NULL;
+ diff_tree_setup_paths(paths, &diff_opts);
+ if (diff_setup_done(&diff_opts) < 0)
+ die("unable to set up diff options to follow renames");
+ diff_tree(t1, t2, base, &diff_opts);
+ diffcore_std(&diff_opts);
+
+ /* NOTE! Ignore the first diff! That was the old one! */
+ for (i = 1; i < diff_queued_diff.nr; i++) {
+ struct diff_filepair *p = diff_queued_diff.queue[i];
+
+ /*
+ * Found a source? Not only do we use that for the new
+ * diff_queued_diff, we also use that as the path in
+ * the future!
+ */
+ if ((p->status == 'R' || p->status == 'C') && !strcmp(p->two->path, opt->paths[0])) {
+ diff_queued_diff.queue[0] = p;
+ opt->paths[0] = xstrdup(p->one->path);
+ diff_tree_setup_paths(opt->paths, opt);
+ break;
+ }
+ }
+
+ /*
+ * Then, ignore any but the first entry! It might be the old one,
+ * or it might be the rename/copy we found
+ */
+ diff_queued_diff.nr = 1;
+}
+
int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base, struct diff_options *opt)
{
void *tree1, *tree2;
@@ -306,6 +360,11 @@ int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const cha
init_tree_desc(&t1, tree1, size1);
init_tree_desc(&t2, tree2, size2);
retval = diff_tree(&t1, &t2, base, opt);
+ if (opt->follow_renames && diff_might_be_rename()) {
+ init_tree_desc(&t1, tree1, size1);
+ init_tree_desc(&t2, tree2, size2);
+ try_to_follow_renames(&t1, &t2, base, opt);
+ }
free(tree1);
free(tree2);
return retval;