*/
#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)
return 0;
}
-static int interesting(struct tree_desc *desc, const char *base, int baselen, struct diff_options *opt)
+/*
+ * Is a tree entry interesting given the pathspec we have?
+ *
+ * Return:
+ * - 2 for "yes, and all subsequent entries will be"
+ * - 1 for yes
+ * - zero for no
+ * - negative for "no, and no subsequent entries will be either"
+ */
+static int tree_entry_interesting(struct tree_desc *desc, const char *base, int baselen, struct diff_options *opt)
{
const char *path;
const unsigned char *sha1;
unsigned mode;
int i;
int pathlen;
+ int never_interesting = -1;
if (!opt->nr_paths)
return 1;
pathlen = tree_entry_len(path, sha1);
- for (i=0; i < opt->nr_paths; i++) {
+ for (i = 0; i < opt->nr_paths; i++) {
const char *match = opt->paths[i];
int matchlen = opt->pathlens[i];
+ int m = -1; /* signals that we haven't called strncmp() */
if (baselen >= matchlen) {
/* If it doesn't match, move along... */
if (strncmp(base, match, matchlen))
continue;
- /* The base is a subdirectory of a path which was specified. */
- return 1;
+ /*
+ * The base is a subdirectory of a path which
+ * was specified, so all of them are interesting.
+ */
+ return 2;
}
/* Does the base match? */
match += baselen;
matchlen -= baselen;
+ if (never_interesting) {
+ /*
+ * We have not seen any match that sorts later
+ * than the current path.
+ */
+
+ /*
+ * Does match sort strictly earlier than path
+ * with their common parts?
+ */
+ m = strncmp(match, path,
+ (matchlen < pathlen) ? matchlen : pathlen);
+ if (m < 0)
+ continue;
+
+ /*
+ * If we come here even once, that means there is at
+ * least one pathspec that would sort equal to or
+ * later than the path we are currently looking at.
+ * In other words, if we have never reached this point
+ * after iterating all pathspecs, it means all
+ * pathspecs are either outside of base, or inside the
+ * base but sorts strictly earlier than the current
+ * one. In either case, they will never match the
+ * subsequent entries. In such a case, we initialized
+ * the variable to -1 and that is what will be
+ * returned, allowing the caller to terminate early.
+ */
+ never_interesting = 0;
+ }
+
if (pathlen > matchlen)
continue;
continue;
}
- if (strncmp(path, match, pathlen))
- continue;
-
- return 1;
+ if (m == -1)
+ /*
+ * we cheated and did not do strncmp(), so we do
+ * that here.
+ */
+ m = strncmp(match, path, pathlen);
+
+ /*
+ * If common part matched earlier then it is a hit,
+ * because we rejected the case where path is not a
+ * leading directory and is shorter than match.
+ */
+ if (!m)
+ return 1;
}
- return 0; /* No matches */
+ return never_interesting; /* No matches */
}
/* A whole sub-tree went away or appeared */
static void show_tree(struct diff_options *opt, const char *prefix, struct tree_desc *desc, const char *base, int baselen)
{
+ int all_interesting = 0;
while (desc->size) {
- if (interesting(desc, base, baselen, opt))
+ int show;
+
+ if (all_interesting)
+ show = 1;
+ else {
+ show = tree_entry_interesting(desc, base, baselen,
+ opt);
+ if (show == 2)
+ all_interesting = 1;
+ }
+ if (show < 0)
+ break;
+ if (show)
show_entry(opt, prefix, desc, base, baselen);
update_tree_entry(desc);
}
char *newbase = malloc_base(base, baselen, path, pathlen);
struct tree_desc inner;
void *tree;
+ unsigned long size;
- tree = read_sha1_file(sha1, &type, &inner.size);
+ tree = read_sha1_file(sha1, &type, &size);
if (!tree || type != OBJ_TREE)
die("corrupt tree sha %s", sha1_to_hex(sha1));
- inner.buf = tree;
+ init_tree_desc(&inner, tree, size);
show_tree(opt, prefix, &inner, newbase, baselen + 1 + pathlen);
free(tree);
}
}
+static void skip_uninteresting(struct tree_desc *t, const char *base, int baselen, struct diff_options *opt)
+{
+ int all_interesting = 0;
+ while (t->size) {
+ int show;
+
+ if (all_interesting)
+ show = 1;
+ else {
+ show = tree_entry_interesting(t, base, baselen, opt);
+ if (show == 2)
+ all_interesting = 1;
+ }
+ if (!show) {
+ update_tree_entry(t);
+ continue;
+ }
+ /* Skip it all? */
+ if (show < 0)
+ t->size = 0;
+ return;
+ }
+}
+
int diff_tree(struct tree_desc *t1, struct tree_desc *t2, const char *base, struct diff_options *opt)
{
int baselen = strlen(base);
- while (t1->size | t2->size) {
+ for (;;) {
if (opt->quiet && opt->has_changes)
break;
- if (opt->nr_paths && t1->size && !interesting(t1, base, baselen, opt)) {
- update_tree_entry(t1);
- continue;
- }
- if (opt->nr_paths && t2->size && !interesting(t2, base, baselen, opt)) {
- update_tree_entry(t2);
- continue;
+ if (opt->nr_paths) {
+ skip_uninteresting(t1, base, baselen, opt);
+ skip_uninteresting(t2, base, baselen, opt);
}
if (!t1->size) {
+ if (!t2->size)
+ break;
show_entry(opt, "+", t2, base, baselen);
update_tree_entry(t2);
continue;
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;
+ struct diff_queue_struct *q = &diff_queued_diff;
+ struct diff_filepair *choice;
+ const char *paths[1];
+ int i;
+
+ /* Remove the file creation entry from the diff queue, and remember it */
+ choice = q->queue[0];
+ q->nr = 0;
+
+ 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);
+
+ /* Go through the new set of filepairing, and see if we find a more interesting one */
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+
+ /*
+ * Found a source? Not only do we use that for the new
+ * diff_queued_diff, we will also use that as the path in
+ * the future!
+ */
+ if ((p->status == 'R' || p->status == 'C') && !strcmp(p->two->path, opt->paths[0])) {
+ /* Switch the file-pairs around */
+ q->queue[i] = choice;
+ choice = p;
+
+ /* Update the path we use from now on.. */
+ opt->paths[0] = xstrdup(p->one->path);
+ diff_tree_setup_paths(opt->paths, opt);
+ break;
+ }
+ }
+
+ /*
+ * Then, discard all the non-relevane file pairs...
+ */
+ for (i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ diff_free_filepair(p);
+ }
+
+ /*
+ * .. and re-instate the one we want (which might be either the
+ * original one, or the rename/copy we found)
+ */
+ q->queue[0] = choice;
+ q->nr = 1;
+}
+
int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *base, struct diff_options *opt)
{
void *tree1, *tree2;
struct tree_desc t1, t2;
+ unsigned long size1, size2;
int retval;
- tree1 = read_object_with_reference(old, tree_type, &t1.size, NULL);
+ tree1 = read_object_with_reference(old, tree_type, &size1, NULL);
if (!tree1)
die("unable to read source tree (%s)", sha1_to_hex(old));
- tree2 = read_object_with_reference(new, tree_type, &t2.size, NULL);
+ tree2 = read_object_with_reference(new, tree_type, &size2, NULL);
if (!tree2)
die("unable to read destination tree (%s)", sha1_to_hex(new));
- t1.buf = tree1;
- t2.buf = tree2;
+ 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;
{
int retval;
void *tree;
+ unsigned long size;
struct tree_desc empty, real;
- tree = read_object_with_reference(new, tree_type, &real.size, NULL);
+ tree = read_object_with_reference(new, tree_type, &size, NULL);
if (!tree)
die("unable to read root tree (%s)", sha1_to_hex(new));
- real.buf = tree;
+ init_tree_desc(&real, tree, size);
- empty.size = 0;
- empty.buf = "";
+ init_tree_desc(&empty, "", 0);
retval = diff_tree(&empty, &real, base, opt);
free(tree);
return retval;