git

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#include "git-compat-util.h"
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#include "diff.h"
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#include "commit.h"
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#include "hash.h"
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#include "hex.h"
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#include "patch-ids.h"
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static int patch_id_defined(struct commit *commit)
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{
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	/* must be 0 or 1 parents */
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	return !commit->parents || !commit->parents->next;
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}
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int commit_patch_id(struct commit *commit, struct diff_options *options,
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		    struct object_id *oid, int diff_header_only)
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{
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	if (!patch_id_defined(commit))
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		return -1;
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	if (commit->parents)
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		diff_tree_oid(&commit->parents->item->object.oid,
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			      &commit->object.oid, "", options);
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	else
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		diff_root_tree_oid(&commit->object.oid, "", options);
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	diffcore_std(options);
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	return diff_flush_patch_id(options, oid, diff_header_only);
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}
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/*
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 * When we cannot load the full patch-id for both commits for whatever
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 * reason, the function returns -1 (i.e. return error(...)). Despite
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 * the "neq" in the name of this function, the caller only cares about
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 * the return value being zero (a and b are equivalent) or non-zero (a
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 * and b are different), and returning non-zero would keep both in the
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 * result, even if they actually were equivalent, in order to err on
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 * the side of safety.  The actual value being negative does not have
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 * any significance; only that it is non-zero matters.
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 */
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static int patch_id_neq(const void *cmpfn_data,
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			const struct hashmap_entry *eptr,
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			const struct hashmap_entry *entry_or_key,
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			const void *keydata UNUSED)
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{
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	/* NEEDSWORK: const correctness? */
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	struct diff_options *opt = (void *)cmpfn_data;
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	struct patch_id *a, *b;
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	a = container_of(eptr, struct patch_id, ent);
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	b = container_of(entry_or_key, struct patch_id, ent);
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	if (is_null_oid(&a->patch_id) &&
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	    commit_patch_id(a->commit, opt, &a->patch_id, 0))
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		return error("Could not get patch ID for %s",
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			oid_to_hex(&a->commit->object.oid));
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	if (is_null_oid(&b->patch_id) &&
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	    commit_patch_id(b->commit, opt, &b->patch_id, 0))
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		return error("Could not get patch ID for %s",
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			oid_to_hex(&b->commit->object.oid));
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	return !oideq(&a->patch_id, &b->patch_id);
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}
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int init_patch_ids(struct repository *r, struct patch_ids *ids)
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{
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	memset(ids, 0, sizeof(*ids));
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	repo_diff_setup(r, &ids->diffopts);
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	ids->diffopts.detect_rename = 0;
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	ids->diffopts.flags.recursive = 1;
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	diff_setup_done(&ids->diffopts);
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	hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256);
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	return 0;
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}
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int free_patch_ids(struct patch_ids *ids)
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{
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	hashmap_clear_and_free(&ids->patches, struct patch_id, ent);
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	return 0;
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}
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static int init_patch_id_entry(struct patch_id *patch,
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			       struct commit *commit,
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			       struct patch_ids *ids)
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{
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	struct object_id header_only_patch_id;
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	patch->commit = commit;
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	if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1))
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		return -1;
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	hashmap_entry_init(&patch->ent, oidhash(&header_only_patch_id));
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	return 0;
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}
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struct patch_id *patch_id_iter_first(struct commit *commit,
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				     struct patch_ids *ids)
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{
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	struct patch_id patch;
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	if (!patch_id_defined(commit))
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		return NULL;
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	memset(&patch, 0, sizeof(patch));
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	if (init_patch_id_entry(&patch, commit, ids))
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		return NULL;
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	return hashmap_get_entry(&ids->patches, &patch, ent, NULL);
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}
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struct patch_id *patch_id_iter_next(struct patch_id *cur,
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				    struct patch_ids *ids)
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{
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	return hashmap_get_next_entry(&ids->patches, cur, ent);
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}
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int has_commit_patch_id(struct commit *commit,
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			struct patch_ids *ids)
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{
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	return !!patch_id_iter_first(commit, ids);
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}
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struct patch_id *add_commit_patch_id(struct commit *commit,
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				     struct patch_ids *ids)
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{
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	struct patch_id *key;
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	if (!patch_id_defined(commit))
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		return NULL;
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	CALLOC_ARRAY(key, 1);
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	if (init_patch_id_entry(key, commit, ids)) {
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		free(key);
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		return NULL;
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	}
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	hashmap_add(&ids->patches, &key->ent);
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	return key;
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}
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