--- /dev/null
+#include "git-compat-util.h"
+#include "builtin.h"
+#include "commit.h"
+#include "config.h"
+#include "diff.h"
+#include "diffcore.h"
+#include "environment.h"
+#include "hashmap.h"
+#include "hex.h"
+#include "log-tree.h"
+#include "object-name.h"
+#include "object.h"
+#include "parse-options.h"
+#include "quote.h"
+#include "repository.h"
+#include "revision.h"
+
+struct last_modified_entry {
+ struct hashmap_entry hashent;
+ struct object_id oid;
+ const char path[FLEX_ARRAY];
+};
+
+static int last_modified_entry_hashcmp(const void *unused UNUSED,
+ const struct hashmap_entry *hent1,
+ const struct hashmap_entry *hent2,
+ const void *path)
+{
+ const struct last_modified_entry *ent1 =
+ container_of(hent1, const struct last_modified_entry, hashent);
+ const struct last_modified_entry *ent2 =
+ container_of(hent2, const struct last_modified_entry, hashent);
+ return strcmp(ent1->path, path ? path : ent2->path);
+}
+
+struct last_modified {
+ struct hashmap paths;
+ struct rev_info rev;
+ bool recursive;
+ bool show_trees;
+};
+
+static void last_modified_release(struct last_modified *lm)
+{
+ hashmap_clear_and_free(&lm->paths, struct last_modified_entry, hashent);
+ release_revisions(&lm->rev);
+}
+
+struct last_modified_callback_data {
+ struct last_modified *lm;
+ struct commit *commit;
+};
+
+static void add_path_from_diff(struct diff_queue_struct *q,
+ struct diff_options *opt UNUSED, void *data)
+{
+ struct last_modified *lm = data;
+
+ for (int i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ struct last_modified_entry *ent;
+ const char *path = p->two->path;
+
+ FLEX_ALLOC_STR(ent, path, path);
+ oidcpy(&ent->oid, &p->two->oid);
+ hashmap_entry_init(&ent->hashent, strhash(ent->path));
+ hashmap_add(&lm->paths, &ent->hashent);
+ }
+}
+
+static int populate_paths_from_revs(struct last_modified *lm)
+{
+ int num_interesting = 0;
+ struct diff_options diffopt;
+
+ /*
+ * Create a copy of `struct diff_options`. In this copy a callback is
+ * set that when called adds entries to `paths` in `struct last_modified`.
+ * This copy is used to diff the tree of the target revision against an
+ * empty tree. This results in all paths in the target revision being
+ * listed. After `paths` is populated, we don't need this copy no more.
+ */
+ memcpy(&diffopt, &lm->rev.diffopt, sizeof(diffopt));
+ copy_pathspec(&diffopt.pathspec, &lm->rev.diffopt.pathspec);
+ diffopt.output_format = DIFF_FORMAT_CALLBACK;
+ diffopt.format_callback = add_path_from_diff;
+ diffopt.format_callback_data = lm;
+
+ for (size_t i = 0; i < lm->rev.pending.nr; i++) {
+ struct object_array_entry *obj = lm->rev.pending.objects + i;
+
+ if (obj->item->flags & UNINTERESTING)
+ continue;
+
+ if (num_interesting++)
+ return error(_("last-modified can only operate on one tree at a time"));
+
+ diff_tree_oid(lm->rev.repo->hash_algo->empty_tree,
+ &obj->item->oid, "", &diffopt);
+ diff_flush(&diffopt);
+ }
+ clear_pathspec(&diffopt.pathspec);
+
+ return 0;
+}
+
+static void last_modified_emit(struct last_modified *lm,
+ const char *path, const struct commit *commit)
+
+{
+ if (commit->object.flags & BOUNDARY)
+ putchar('^');
+ printf("%s\t", oid_to_hex(&commit->object.oid));
+
+ if (lm->rev.diffopt.line_termination)
+ write_name_quoted(path, stdout, '\n');
+ else
+ printf("%s%c", path, '\0');
+}
+
+static void mark_path(const char *path, const struct object_id *oid,
+ struct last_modified_callback_data *data)
+{
+ struct last_modified_entry *ent;
+
+ /* Is it even a path that we are interested in? */
+ ent = hashmap_get_entry_from_hash(&data->lm->paths, strhash(path), path,
+ struct last_modified_entry, hashent);
+ if (!ent)
+ return;
+
+ /*
+ * Is it arriving at a version of interest, or is it from a side branch
+ * which did not contribute to the final state?
+ */
+ if (!oideq(oid, &ent->oid))
+ return;
+
+ last_modified_emit(data->lm, path, data->commit);
+
+ hashmap_remove(&data->lm->paths, &ent->hashent, path);
+ free(ent);
+}
+
+static void last_modified_diff(struct diff_queue_struct *q,
+ struct diff_options *opt UNUSED, void *cbdata)
+{
+ struct last_modified_callback_data *data = cbdata;
+
+ for (int i = 0; i < q->nr; i++) {
+ struct diff_filepair *p = q->queue[i];
+ switch (p->status) {
+ case DIFF_STATUS_DELETED:
+ /*
+ * There's no point in feeding a deletion, as it could
+ * not have resulted in our current state, which
+ * actually has the file.
+ */
+ break;
+
+ default:
+ /*
+ * Otherwise, we care only that we somehow arrived at
+ * a final oid state. Note that this covers some
+ * potentially controversial areas, including:
+ *
+ * 1. A rename or copy will be found, as it is the
+ * first time the content has arrived at the given
+ * path.
+ *
+ * 2. Even a non-content modification like a mode or
+ * type change will trigger it.
+ *
+ * We take the inclusive approach for now, and find
+ * anything which impacts the path. Options to tweak
+ * the behavior (e.g., to "--follow" the content across
+ * renames) can come later.
+ */
+ mark_path(p->two->path, &p->two->oid, data);
+ break;
+ }
+ }
+}
+
+static int last_modified_run(struct last_modified *lm)
+{
+ struct last_modified_callback_data data = { .lm = lm };
+
+ lm->rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
+ lm->rev.diffopt.format_callback = last_modified_diff;
+ lm->rev.diffopt.format_callback_data = &data;
+
+ prepare_revision_walk(&lm->rev);
+
+ while (hashmap_get_size(&lm->paths)) {
+ data.commit = get_revision(&lm->rev);
+ if (!data.commit)
+ BUG("paths remaining beyond boundary in last-modified");
+
+ if (data.commit->object.flags & BOUNDARY) {
+ diff_tree_oid(lm->rev.repo->hash_algo->empty_tree,
+ &data.commit->object.oid, "",
+ &lm->rev.diffopt);
+ diff_flush(&lm->rev.diffopt);
+ } else {
+ log_tree_commit(&lm->rev, data.commit);
+ }
+ }
+
+ return 0;
+}
+
+static int last_modified_init(struct last_modified *lm, struct repository *r,
+ const char *prefix, int argc, const char **argv)
+{
+ hashmap_init(&lm->paths, last_modified_entry_hashcmp, NULL, 0);
+
+ repo_init_revisions(r, &lm->rev, prefix);
+ lm->rev.def = "HEAD";
+ lm->rev.combine_merges = 1;
+ lm->rev.show_root_diff = 1;
+ lm->rev.boundary = 1;
+ lm->rev.no_commit_id = 1;
+ lm->rev.diff = 1;
+ lm->rev.diffopt.flags.recursive = lm->recursive;
+ lm->rev.diffopt.flags.tree_in_recursive = lm->show_trees;
+
+ argc = setup_revisions(argc, argv, &lm->rev, NULL);
+ if (argc > 1) {
+ error(_("unknown last-modified argument: %s"), argv[1]);
+ return argc;
+ }
+
+ if (populate_paths_from_revs(lm) < 0)
+ return error(_("unable to setup last-modified"));
+
+ return 0;
+}
+
+int cmd_last_modified(int argc, const char **argv, const char *prefix,
+ struct repository *repo)
+{
+ int ret;
+ struct last_modified lm = { 0 };
+
+ const char * const last_modified_usage[] = {
+ N_("git last-modified [--recursive] [--show-trees] "
+ "[<revision-range>] [[--] <path>...]"),
+ NULL
+ };
+
+ struct option last_modified_options[] = {
+ OPT_BOOL('r', "recursive", &lm.recursive,
+ N_("recurse into subtrees")),
+ OPT_BOOL('t', "show-trees", &lm.show_trees,
+ N_("show tree entries when recursing into subtrees")),
+ OPT_END()
+ };
+
+ argc = parse_options(argc, argv, prefix, last_modified_options,
+ last_modified_usage,
+ PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT);
+
+ repo_config(repo, git_default_config, NULL);
+
+ ret = last_modified_init(&lm, repo, prefix, argc, argv);
+ if (ret > 0)
+ usage_with_options(last_modified_usage,
+ last_modified_options);
+ if (ret)
+ goto out;
+
+ ret = last_modified_run(&lm);
+ if (ret)
+ goto out;
+
+out:
+ last_modified_release(&lm);
+
+ return ret;
+}
--- /dev/null
+#!/bin/sh
+
+test_description='last-modified tests'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ test_commit 1 file &&
+ mkdir a &&
+ test_commit 2 a/file &&
+ mkdir a/b &&
+ test_commit 3 a/b/file
+'
+
+test_expect_success 'cannot run last-modified on two trees' '
+ test_must_fail git last-modified HEAD HEAD~1
+'
+
+check_last_modified() {
+ local indir= &&
+ while test $# != 0
+ do
+ case "$1" in
+ -C)
+ indir="$2"
+ shift
+ ;;
+ *)
+ break
+ ;;
+ esac &&
+ shift
+ done &&
+
+ cat >expect &&
+ test_when_finished "rm -f tmp.*" &&
+ git ${indir:+-C "$indir"} last-modified "$@" >tmp.1 &&
+ git name-rev --annotate-stdin --name-only --tags \
+ <tmp.1 >tmp.2 &&
+ tr '\t' ' ' <tmp.2 >actual &&
+ test_cmp expect actual
+}
+
+test_expect_success 'last-modified non-recursive' '
+ check_last_modified <<-\EOF
+ 3 a
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified recursive' '
+ check_last_modified -r <<-\EOF
+ 3 a/b/file
+ 2 a/file
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified recursive with show-trees' '
+ check_last_modified -r -t <<-\EOF
+ 3 a
+ 3 a/b
+ 3 a/b/file
+ 2 a/file
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified non-recursive with show-trees' '
+ check_last_modified -t <<-\EOF
+ 3 a
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified subdir' '
+ check_last_modified a <<-\EOF
+ 3 a
+ EOF
+'
+
+test_expect_success 'last-modified subdir recursive' '
+ check_last_modified -r a <<-\EOF
+ 3 a/b/file
+ 2 a/file
+ EOF
+'
+
+test_expect_success 'last-modified from non-HEAD commit' '
+ check_last_modified HEAD^ <<-\EOF
+ 2 a
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified from subdir defaults to root' '
+ check_last_modified -C a <<-\EOF
+ 3 a
+ 1 file
+ EOF
+'
+
+test_expect_success 'last-modified from subdir uses relative pathspecs' '
+ check_last_modified -C a -r b <<-\EOF
+ 3 a/b/file
+ EOF
+'
+
+test_expect_success 'limit last-modified traversal by count' '
+ check_last_modified -1 <<-\EOF
+ 3 a
+ ^2 file
+ EOF
+'
+
+test_expect_success 'limit last-modified traversal by commit' '
+ check_last_modified HEAD~2..HEAD <<-\EOF
+ 3 a
+ ^1 file
+ EOF
+'
+
+test_expect_success 'only last-modified files in the current tree' '
+ git rm -rf a &&
+ git commit -m "remove a" &&
+ check_last_modified <<-\EOF
+ 1 file
+ EOF
+'
+
+test_expect_success 'cross merge boundaries in blaming' '
+ git checkout HEAD^0 &&
+ git rm -rf . &&
+ test_commit m1 &&
+ git checkout HEAD^ &&
+ git rm -rf . &&
+ test_commit m2 &&
+ git merge m1 &&
+ check_last_modified <<-\EOF
+ m2 m2.t
+ m1 m1.t
+ EOF
+'
+
+test_expect_success 'last-modified merge for resolved conflicts' '
+ git checkout HEAD^0 &&
+ git rm -rf . &&
+ test_commit c1 conflict &&
+ git checkout HEAD^ &&
+ git rm -rf . &&
+ test_commit c2 conflict &&
+ test_must_fail git merge c1 &&
+ test_commit resolved conflict &&
+ check_last_modified conflict <<-\EOF
+ resolved conflict
+ EOF
+'
+
+
+# Consider `file` with this content through history:
+#
+# A---B---B-------B---B
+# \ /
+# C---D
+test_expect_success 'last-modified merge ignores content from branch' '
+ git checkout HEAD^0 &&
+ git rm -rf . &&
+ test_commit a1 file A &&
+ test_commit a2 file B &&
+ test_commit a3 file C &&
+ test_commit a4 file D &&
+ git checkout a2 &&
+ git merge --no-commit --no-ff a4 &&
+ git checkout a2 -- file &&
+ git merge --continue &&
+ check_last_modified <<-\EOF
+ a2 file
+ EOF
+'
+
+# Consider `file` with this content through history:
+#
+# A---B---B---C---D---B---B
+# \ /
+# B-------B
+test_expect_success 'last-modified merge undoes changes' '
+ git checkout HEAD^0 &&
+ git rm -rf . &&
+ test_commit b1 file A &&
+ test_commit b2 file B &&
+ test_commit b3 file C &&
+ test_commit b4 file D &&
+ git checkout b2 &&
+ test_commit b5 file2 2 &&
+ git checkout b4 &&
+ git merge --no-commit --no-ff b5 &&
+ git checkout b2 -- file &&
+ git merge --continue &&
+ check_last_modified <<-\EOF
+ b5 file2
+ b2 file
+ EOF
+'
+
+test_expect_success 'last-modified complains about unknown arguments' '
+ test_must_fail git last-modified --foo 2>err &&
+ grep "unknown last-modified argument: --foo" err
+'
+
+test_done
projects / thirdparty / git.git / commitdiff
