diff options
Diffstat (limited to 'patch-ids.c')
| -rw-r--r-- | patch-ids.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/patch-ids.c b/patch-ids.c new file mode 100644 index 0000000..c3e1a0d --- /dev/null +++ b/patch-ids.c @@ -0,0 +1,137 @@ +#include "git-compat-util.h" +#include "diff.h" +#include "commit.h" +#include "hash.h" +#include "hash-lookup.h" +#include "hex.h" +#include "patch-ids.h" + +static int patch_id_defined(struct commit *commit) +{ + /* must be 0 or 1 parents */ + return !commit->parents || !commit->parents->next; +} + +int commit_patch_id(struct commit *commit, struct diff_options *options, + struct object_id *oid, int diff_header_only) +{ + if (!patch_id_defined(commit)) + return -1; + + if (commit->parents) + diff_tree_oid(&commit->parents->item->object.oid, + &commit->object.oid, "", options); + else + diff_root_tree_oid(&commit->object.oid, "", options); + diffcore_std(options); + return diff_flush_patch_id(options, oid, diff_header_only); +} + +/* + * When we cannot load the full patch-id for both commits for whatever + * reason, the function returns -1 (i.e. return error(...)). Despite + * the "neq" in the name of this function, the caller only cares about + * the return value being zero (a and b are equivalent) or non-zero (a + * and b are different), and returning non-zero would keep both in the + * result, even if they actually were equivalent, in order to err on + * the side of safety. The actual value being negative does not have + * any significance; only that it is non-zero matters. + */ +static int patch_id_neq(const void *cmpfn_data, + const struct hashmap_entry *eptr, + const struct hashmap_entry *entry_or_key, + const void *keydata UNUSED) +{ + /* NEEDSWORK: const correctness? */ + struct diff_options *opt = (void *)cmpfn_data; + struct patch_id *a, *b; + + a = container_of(eptr, struct patch_id, ent); + b = container_of(entry_or_key, struct patch_id, ent); + + if (is_null_oid(&a->patch_id) && + commit_patch_id(a->commit, opt, &a->patch_id, 0)) + return error("Could not get patch ID for %s", + oid_to_hex(&a->commit->object.oid)); + if (is_null_oid(&b->patch_id) && + commit_patch_id(b->commit, opt, &b->patch_id, 0)) + return error("Could not get patch ID for %s", + oid_to_hex(&b->commit->object.oid)); + return !oideq(&a->patch_id, &b->patch_id); +} + +int init_patch_ids(struct repository *r, struct patch_ids *ids) +{ + memset(ids, 0, sizeof(*ids)); + repo_diff_setup(r, &ids->diffopts); + ids->diffopts.detect_rename = 0; + ids->diffopts.flags.recursive = 1; + diff_setup_done(&ids->diffopts); + hashmap_init(&ids->patches, patch_id_neq, &ids->diffopts, 256); + return 0; +} + +int free_patch_ids(struct patch_ids *ids) +{ + hashmap_clear_and_free(&ids->patches, struct patch_id, ent); + return 0; +} + +static int init_patch_id_entry(struct patch_id *patch, + struct commit *commit, + struct patch_ids *ids) +{ + struct object_id header_only_patch_id; + + patch->commit = commit; + if (commit_patch_id(commit, &ids->diffopts, &header_only_patch_id, 1)) + return -1; + + hashmap_entry_init(&patch->ent, oidhash(&header_only_patch_id)); + return 0; +} + +struct patch_id *patch_id_iter_first(struct commit *commit, + struct patch_ids *ids) +{ + struct patch_id patch; + + if (!patch_id_defined(commit)) + return NULL; + + memset(&patch, 0, sizeof(patch)); + if (init_patch_id_entry(&patch, commit, ids)) + return NULL; + + return hashmap_get_entry(&ids->patches, &patch, ent, NULL); +} + +struct patch_id *patch_id_iter_next(struct patch_id *cur, + struct patch_ids *ids) +{ + return hashmap_get_next_entry(&ids->patches, cur, ent); +} + +int has_commit_patch_id(struct commit *commit, + struct patch_ids *ids) +{ + return !!patch_id_iter_first(commit, ids); +} + +struct patch_id *add_commit_patch_id(struct commit *commit, + struct patch_ids *ids) +{ + struct patch_id *key; + + if (!patch_id_defined(commit)) + return NULL; + + CALLOC_ARRAY(key, 1); + if (init_patch_id_entry(key, commit, ids)) { + free(key); + return NULL; + } + + hashmap_add(&ids->patches, &key->ent); + return key; +} |