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#include "cache.h"
#include "diff.h"
#include "commit.h"
#include "log-tree.h"
int log_tree_diff_flush(struct rev_info *opt)
{
diffcore_std(&opt->diffopt);
if (diff_queue_is_empty()) {
int saved_fmt = opt->diffopt.output_format;
opt->diffopt.output_format = DIFF_FORMAT_NO_OUTPUT;
diff_flush(&opt->diffopt);
opt->diffopt.output_format = saved_fmt;
return 0;
}
if (opt->header) {
if (!opt->no_commit_id)
printf("%s%c", opt->header,
opt->diffopt.line_termination);
opt->header = NULL;
}
diff_flush(&opt->diffopt);
return 1;
}
static int diff_root_tree(struct rev_info *opt,
const unsigned char *new, const char *base)
{
int retval;
void *tree;
struct tree_desc empty, real;
tree = read_object_with_reference(new, tree_type, &real.size, NULL);
if (!tree)
die("unable to read root tree (%s)", sha1_to_hex(new));
real.buf = tree;
empty.buf = "";
empty.size = 0;
retval = diff_tree(&empty, &real, base, &opt->diffopt);
free(tree);
log_tree_diff_flush(opt);
return retval;
}
static const char *generate_header(struct rev_info *opt,
const unsigned char *commit_sha1,
const unsigned char *parent_sha1,
const struct commit *commit)
{
static char this_header[16384];
int offset;
unsigned long len;
int abbrev = opt->diffopt.abbrev;
const char *msg = commit->buffer;
if (opt->use_precomputed_header)
return opt->use_precomputed_header;
if (!opt->verbose_header)
return sha1_to_hex(commit_sha1);
len = strlen(msg);
offset = sprintf(this_header, "%s%s ",
opt->header_prefix,
diff_unique_abbrev(commit_sha1, abbrev));
if (commit_sha1 != parent_sha1)
offset += sprintf(this_header + offset, "(from %s)\n",
parent_sha1
? diff_unique_abbrev(parent_sha1, abbrev)
: "root");
else
offset += sprintf(this_header + offset, "(from parents)\n");
offset += pretty_print_commit(opt->commit_format, commit, len,
this_header + offset,
sizeof(this_header) - offset, abbrev);
if (opt->always_show_header) {
puts(this_header);
return NULL;
}
return this_header;
}
static int do_diff_combined(struct rev_info *opt, struct commit *commit)
{
unsigned const char *sha1 = commit->object.sha1;
opt->header = generate_header(opt, sha1, sha1, commit);
opt->header = diff_tree_combined_merge(sha1, opt->header,
opt->dense_combined_merges,
&opt->diffopt);
if (!opt->header && opt->verbose_header)
opt->header_prefix = "\ndiff-tree ";
return 0;
}
int log_tree_commit(struct rev_info *opt, struct commit *commit)
{
struct commit_list *parents;
unsigned const char *sha1 = commit->object.sha1;
/* Root commit? */
if (opt->show_root_diff && !commit->parents) {
opt->header = generate_header(opt, sha1, NULL, commit);
diff_root_tree(opt, sha1, "");
}
/* More than one parent? */
if (commit->parents && commit->parents->next) {
if (opt->ignore_merges)
return 0;
else if (opt->combine_merges)
return do_diff_combined(opt, commit);
}
for (parents = commit->parents; parents; parents = parents->next) {
struct commit *parent = parents->item;
unsigned const char *psha1 = parent->object.sha1;
opt->header = generate_header(opt, sha1, psha1, commit);
diff_tree_sha1(psha1, sha1, "", &opt->diffopt);
log_tree_diff_flush(opt);
if (!opt->header && opt->verbose_header)
opt->header_prefix = "\ndiff-tree ";
}
return 0;
}
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