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![Jeff King](/assets/img/avatar_default.png)
When this function was extracted in 0041bf6544
(name-rev: refactor logic
to see if a new candidate is a better name, 2017-03-29), it ended up
getting more arguments than it needs.
It's possible we may later use these values to evaluate the name, but
since it's a static function with a single caller, it will be easy to
add them back then.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
519 lines
13 KiB
C
519 lines
13 KiB
C
#include "builtin.h"
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#include "cache.h"
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#include "repository.h"
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#include "config.h"
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#include "commit.h"
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#include "tag.h"
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#include "refs.h"
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#include "parse-options.h"
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#include "sha1-lookup.h"
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#include "commit-slab.h"
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#define CUTOFF_DATE_SLOP 86400 /* one day */
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typedef struct rev_name {
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const char *tip_name;
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timestamp_t taggerdate;
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int generation;
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int distance;
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int from_tag;
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} rev_name;
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define_commit_slab(commit_rev_name, struct rev_name *);
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static timestamp_t cutoff = TIME_MAX;
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static struct commit_rev_name rev_names;
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/* How many generations are maximally preferred over _one_ merge traversal? */
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#define MERGE_TRAVERSAL_WEIGHT 65535
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static struct rev_name *get_commit_rev_name(struct commit *commit)
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{
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struct rev_name **slot = commit_rev_name_peek(&rev_names, commit);
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return slot ? *slot : NULL;
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}
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static void set_commit_rev_name(struct commit *commit, struct rev_name *name)
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{
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*commit_rev_name_at(&rev_names, commit) = name;
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}
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static int is_better_name(struct rev_name *name,
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timestamp_t taggerdate,
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int distance,
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int from_tag)
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{
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/*
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* When comparing names based on tags, prefer names
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* based on the older tag, even if it is farther away.
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*/
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if (from_tag && name->from_tag)
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return (name->taggerdate > taggerdate ||
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(name->taggerdate == taggerdate &&
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name->distance > distance));
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/*
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* We know that at least one of them is a non-tag at this point.
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* favor a tag over a non-tag.
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*/
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if (name->from_tag != from_tag)
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return from_tag;
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/*
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* We are now looking at two non-tags. Tiebreak to favor
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* shorter hops.
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*/
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if (name->distance != distance)
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return name->distance > distance;
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/* ... or tiebreak to favor older date */
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if (name->taggerdate != taggerdate)
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return name->taggerdate > taggerdate;
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/* keep the current one if we cannot decide */
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return 0;
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}
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static void name_rev(struct commit *commit,
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const char *tip_name, timestamp_t taggerdate,
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int generation, int distance, int from_tag,
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int deref)
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{
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struct rev_name *name = get_commit_rev_name(commit);
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struct commit_list *parents;
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int parent_number = 1;
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char *to_free = NULL;
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parse_commit(commit);
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if (commit->date < cutoff)
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return;
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if (deref) {
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tip_name = to_free = xstrfmt("%s^0", tip_name);
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if (generation)
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die("generation: %d, but deref?", generation);
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}
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if (name == NULL) {
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name = xmalloc(sizeof(rev_name));
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set_commit_rev_name(commit, name);
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goto copy_data;
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} else if (is_better_name(name, taggerdate, distance, from_tag)) {
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copy_data:
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name->tip_name = tip_name;
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name->taggerdate = taggerdate;
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name->generation = generation;
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name->distance = distance;
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name->from_tag = from_tag;
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} else {
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free(to_free);
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return;
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}
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for (parents = commit->parents;
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parents;
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parents = parents->next, parent_number++) {
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if (parent_number > 1) {
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size_t len;
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char *new_name;
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strip_suffix(tip_name, "^0", &len);
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if (generation > 0)
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new_name = xstrfmt("%.*s~%d^%d", (int)len, tip_name,
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generation, parent_number);
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else
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new_name = xstrfmt("%.*s^%d", (int)len, tip_name,
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parent_number);
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name_rev(parents->item, new_name, taggerdate, 0,
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distance + MERGE_TRAVERSAL_WEIGHT,
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from_tag, 0);
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} else {
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name_rev(parents->item, tip_name, taggerdate,
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generation + 1, distance + 1,
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from_tag, 0);
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}
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}
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}
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static int subpath_matches(const char *path, const char *filter)
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{
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const char *subpath = path;
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while (subpath) {
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if (!wildmatch(filter, subpath, 0))
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return subpath - path;
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subpath = strchr(subpath, '/');
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if (subpath)
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subpath++;
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}
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return -1;
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}
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static const char *name_ref_abbrev(const char *refname, int shorten_unambiguous)
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{
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if (shorten_unambiguous)
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refname = shorten_unambiguous_ref(refname, 0);
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else if (starts_with(refname, "refs/heads/"))
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refname = refname + 11;
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else if (starts_with(refname, "refs/"))
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refname = refname + 5;
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return refname;
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}
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struct name_ref_data {
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int tags_only;
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int name_only;
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struct string_list ref_filters;
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struct string_list exclude_filters;
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};
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static struct tip_table {
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struct tip_table_entry {
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struct object_id oid;
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const char *refname;
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} *table;
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int nr;
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int alloc;
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int sorted;
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} tip_table;
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static void add_to_tip_table(const struct object_id *oid, const char *refname,
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int shorten_unambiguous)
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{
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refname = name_ref_abbrev(refname, shorten_unambiguous);
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ALLOC_GROW(tip_table.table, tip_table.nr + 1, tip_table.alloc);
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oidcpy(&tip_table.table[tip_table.nr].oid, oid);
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tip_table.table[tip_table.nr].refname = xstrdup(refname);
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tip_table.nr++;
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tip_table.sorted = 0;
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}
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static int tipcmp(const void *a_, const void *b_)
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{
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const struct tip_table_entry *a = a_, *b = b_;
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return oidcmp(&a->oid, &b->oid);
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}
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static int name_ref(const char *path, const struct object_id *oid, int flags, void *cb_data)
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{
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struct object *o = parse_object(the_repository, oid);
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struct name_ref_data *data = cb_data;
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int can_abbreviate_output = data->tags_only && data->name_only;
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int deref = 0;
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timestamp_t taggerdate = TIME_MAX;
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if (data->tags_only && !starts_with(path, "refs/tags/"))
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return 0;
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if (data->exclude_filters.nr) {
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struct string_list_item *item;
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for_each_string_list_item(item, &data->exclude_filters) {
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if (subpath_matches(path, item->string) >= 0)
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return 0;
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}
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}
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if (data->ref_filters.nr) {
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struct string_list_item *item;
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int matched = 0;
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/* See if any of the patterns match. */
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for_each_string_list_item(item, &data->ref_filters) {
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/*
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* Check all patterns even after finding a match, so
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* that we can see if a match with a subpath exists.
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* When a user asked for 'refs/tags/v*' and 'v1.*',
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* both of which match, the user is showing her
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* willingness to accept a shortened output by having
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* the 'v1.*' in the acceptable refnames, so we
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* shouldn't stop when seeing 'refs/tags/v1.4' matches
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* 'refs/tags/v*'. We should show it as 'v1.4'.
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*/
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switch (subpath_matches(path, item->string)) {
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case -1: /* did not match */
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break;
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case 0: /* matched fully */
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matched = 1;
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break;
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default: /* matched subpath */
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matched = 1;
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can_abbreviate_output = 1;
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break;
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}
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}
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/* If none of the patterns matched, stop now */
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if (!matched)
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return 0;
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}
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add_to_tip_table(oid, path, can_abbreviate_output);
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while (o && o->type == OBJ_TAG) {
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struct tag *t = (struct tag *) o;
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if (!t->tagged)
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break; /* broken repository */
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o = parse_object(the_repository, &t->tagged->oid);
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deref = 1;
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taggerdate = t->date;
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}
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if (o && o->type == OBJ_COMMIT) {
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struct commit *commit = (struct commit *)o;
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int from_tag = starts_with(path, "refs/tags/");
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if (taggerdate == TIME_MAX)
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taggerdate = ((struct commit *)o)->date;
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path = name_ref_abbrev(path, can_abbreviate_output);
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name_rev(commit, xstrdup(path), taggerdate, 0, 0,
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from_tag, deref);
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}
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return 0;
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}
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static const unsigned char *nth_tip_table_ent(size_t ix, void *table_)
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{
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struct tip_table_entry *table = table_;
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return table[ix].oid.hash;
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}
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static const char *get_exact_ref_match(const struct object *o)
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{
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int found;
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if (!tip_table.table || !tip_table.nr)
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return NULL;
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if (!tip_table.sorted) {
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QSORT(tip_table.table, tip_table.nr, tipcmp);
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tip_table.sorted = 1;
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}
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found = sha1_pos(o->oid.hash, tip_table.table, tip_table.nr,
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nth_tip_table_ent);
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if (0 <= found)
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return tip_table.table[found].refname;
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return NULL;
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}
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/* may return a constant string or use "buf" as scratch space */
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static const char *get_rev_name(const struct object *o, struct strbuf *buf)
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{
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struct rev_name *n;
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struct commit *c;
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if (o->type != OBJ_COMMIT)
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return get_exact_ref_match(o);
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c = (struct commit *) o;
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n = get_commit_rev_name(c);
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if (!n)
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return NULL;
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if (!n->generation)
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return n->tip_name;
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else {
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int len = strlen(n->tip_name);
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if (len > 2 && !strcmp(n->tip_name + len - 2, "^0"))
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len -= 2;
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strbuf_reset(buf);
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strbuf_addf(buf, "%.*s~%d", len, n->tip_name, n->generation);
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return buf->buf;
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}
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}
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static void show_name(const struct object *obj,
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const char *caller_name,
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int always, int allow_undefined, int name_only)
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{
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const char *name;
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const struct object_id *oid = &obj->oid;
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struct strbuf buf = STRBUF_INIT;
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if (!name_only)
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printf("%s ", caller_name ? caller_name : oid_to_hex(oid));
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name = get_rev_name(obj, &buf);
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if (name)
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printf("%s\n", name);
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else if (allow_undefined)
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printf("undefined\n");
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else if (always)
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printf("%s\n", find_unique_abbrev(oid, DEFAULT_ABBREV));
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else
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die("cannot describe '%s'", oid_to_hex(oid));
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strbuf_release(&buf);
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}
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static char const * const name_rev_usage[] = {
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N_("git name-rev [<options>] <commit>..."),
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N_("git name-rev [<options>] --all"),
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N_("git name-rev [<options>] --stdin"),
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NULL
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};
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static void name_rev_line(char *p, struct name_ref_data *data)
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{
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struct strbuf buf = STRBUF_INIT;
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int counter = 0;
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char *p_start;
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const unsigned hexsz = the_hash_algo->hexsz;
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for (p_start = p; *p; p++) {
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#define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
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if (!ishex(*p))
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counter = 0;
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else if (++counter == hexsz &&
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!ishex(*(p+1))) {
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struct object_id oid;
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const char *name = NULL;
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char c = *(p+1);
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int p_len = p - p_start + 1;
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counter = 0;
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*(p+1) = 0;
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if (!get_oid(p - (hexsz - 1), &oid)) {
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struct object *o =
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lookup_object(the_repository,
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oid.hash);
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if (o)
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name = get_rev_name(o, &buf);
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}
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*(p+1) = c;
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if (!name)
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continue;
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if (data->name_only)
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printf("%.*s%s", p_len - hexsz, p_start, name);
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else
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printf("%.*s (%s)", p_len, p_start, name);
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p_start = p + 1;
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}
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}
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/* flush */
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if (p_start != p)
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fwrite(p_start, p - p_start, 1, stdout);
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strbuf_release(&buf);
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}
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int cmd_name_rev(int argc, const char **argv, const char *prefix)
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{
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struct object_array revs = OBJECT_ARRAY_INIT;
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int all = 0, transform_stdin = 0, allow_undefined = 1, always = 0, peel_tag = 0;
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struct name_ref_data data = { 0, 0, STRING_LIST_INIT_NODUP, STRING_LIST_INIT_NODUP };
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struct option opts[] = {
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OPT_BOOL(0, "name-only", &data.name_only, N_("print only names (no SHA-1)")),
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OPT_BOOL(0, "tags", &data.tags_only, N_("only use tags to name the commits")),
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OPT_STRING_LIST(0, "refs", &data.ref_filters, N_("pattern"),
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N_("only use refs matching <pattern>")),
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OPT_STRING_LIST(0, "exclude", &data.exclude_filters, N_("pattern"),
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N_("ignore refs matching <pattern>")),
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OPT_GROUP(""),
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OPT_BOOL(0, "all", &all, N_("list all commits reachable from all refs")),
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OPT_BOOL(0, "stdin", &transform_stdin, N_("read from stdin")),
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OPT_BOOL(0, "undefined", &allow_undefined, N_("allow to print `undefined` names (default)")),
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OPT_BOOL(0, "always", &always,
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N_("show abbreviated commit object as fallback")),
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{
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/* A Hidden OPT_BOOL */
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OPTION_SET_INT, 0, "peel-tag", &peel_tag, NULL,
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N_("dereference tags in the input (internal use)"),
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PARSE_OPT_NOARG | PARSE_OPT_HIDDEN, NULL, 1,
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},
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OPT_END(),
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};
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init_commit_rev_name(&rev_names);
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, opts, name_rev_usage, 0);
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if (all + transform_stdin + !!argc > 1) {
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error("Specify either a list, or --all, not both!");
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usage_with_options(name_rev_usage, opts);
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}
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if (all || transform_stdin)
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cutoff = 0;
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for (; argc; argc--, argv++) {
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struct object_id oid;
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struct object *object;
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struct commit *commit;
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if (get_oid(*argv, &oid)) {
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fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
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*argv);
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continue;
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}
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commit = NULL;
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object = parse_object(the_repository, &oid);
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if (object) {
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struct object *peeled = deref_tag(the_repository,
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object, *argv, 0);
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if (peeled && peeled->type == OBJ_COMMIT)
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commit = (struct commit *)peeled;
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}
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if (!object) {
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fprintf(stderr, "Could not get object for %s. Skipping.\n",
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*argv);
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continue;
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}
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if (commit) {
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if (cutoff > commit->date)
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cutoff = commit->date;
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}
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if (peel_tag) {
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if (!commit) {
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fprintf(stderr, "Could not get commit for %s. Skipping.\n",
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*argv);
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continue;
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}
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object = (struct object *)commit;
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}
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add_object_array(object, *argv, &revs);
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}
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if (cutoff)
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cutoff = cutoff - CUTOFF_DATE_SLOP;
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for_each_ref(name_ref, &data);
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if (transform_stdin) {
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char buffer[2048];
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while (!feof(stdin)) {
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char *p = fgets(buffer, sizeof(buffer), stdin);
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if (!p)
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break;
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name_rev_line(p, &data);
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}
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} else if (all) {
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int i, max;
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max = get_max_object_index();
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for (i = 0; i < max; i++) {
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struct object *obj = get_indexed_object(i);
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if (!obj || obj->type != OBJ_COMMIT)
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continue;
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show_name(obj, NULL,
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always, allow_undefined, data.name_only);
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}
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} else {
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int i;
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for (i = 0; i < revs.nr; i++)
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show_name(revs.objects[i].item, revs.objects[i].name,
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always, allow_undefined, data.name_only);
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}
|
|
|
|
UNLEAK(revs);
|
|
return 0;
|
|
}
|