Merge branch 'tr/maint-cherry-pick-list' into maint
[git/git.git] / revision.c
index c2fad2f..a8f0aa4 100644 (file)
 #include "reflog-walk.h"
 #include "patch-ids.h"
 #include "decorate.h"
+#include "log-tree.h"
 
 volatile show_early_output_fn_t show_early_output;
 
-static char *path_name(struct name_path *path, const char *name)
+char *path_name(const struct name_path *path, const char *name)
 {
-       struct name_path *p;
+       const struct name_path *p;
        char *n, *m;
        int nlen = strlen(name);
        int len = nlen + 1;
@@ -132,11 +133,21 @@ void mark_parents_uninteresting(struct commit *commit)
 static void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
 {
        if (revs->no_walk && (obj->flags & UNINTERESTING))
-               die("object ranges do not make sense when not walking revisions");
-       if (revs->reflog_info && obj->type == OBJ_COMMIT &&
-                       add_reflog_for_walk(revs->reflog_info,
-                               (struct commit *)obj, name))
-               return;
+               revs->no_walk = 0;
+       if (revs->reflog_info && obj->type == OBJ_COMMIT) {
+               struct strbuf buf = STRBUF_INIT;
+               int len = interpret_branch_name(name, &buf);
+               int st;
+
+               if (0 < len && name[len] && buf.len)
+                       strbuf_addstr(&buf, name + len);
+               st = add_reflog_for_walk(revs->reflog_info,
+                                        (struct commit *)obj,
+                                        buf.buf[0] ? buf.buf: name);
+               strbuf_release(&buf);
+               if (st)
+                       return;
+       }
        add_object_array_with_mode(obj, name, &revs->pending, mode);
 }
 
@@ -182,8 +193,11 @@ static struct commit *handle_commit(struct rev_info *revs, struct object *object
                if (!tag->tagged)
                        die("bad tag");
                object = parse_object(tag->tagged->sha1);
-               if (!object)
+               if (!object) {
+                       if (flags & UNINTERESTING)
+                               return NULL;
                        die("bad object %s", sha1_to_hex(tag->tagged->sha1));
+               }
        }
 
        /*
@@ -199,11 +213,13 @@ static struct commit *handle_commit(struct rev_info *revs, struct object *object
                        mark_parents_uninteresting(commit);
                        revs->limited = 1;
                }
+               if (revs->show_source && !commit->util)
+                       commit->util = (void *) name;
                return commit;
        }
 
        /*
-        * Tree object? Either mark it uniniteresting, or add it
+        * Tree object? Either mark it uninteresting, or add it
         * to the list of objects to look at later..
         */
        if (object->type == OBJ_TREE) {
@@ -250,34 +266,23 @@ static int everybody_uninteresting(struct commit_list *orig)
 
 /*
  * The goal is to get REV_TREE_NEW as the result only if the
- * diff consists of all '+' (and no other changes), and
- * REV_TREE_DIFFERENT otherwise (of course if the trees are
- * the same we want REV_TREE_SAME).  That means that once we
- * get to REV_TREE_DIFFERENT, we do not have to look any further.
+ * diff consists of all '+' (and no other changes), REV_TREE_OLD
+ * if the whole diff is removal of old data, and otherwise
+ * REV_TREE_DIFFERENT (of course if the trees are the same we
+ * want REV_TREE_SAME).
+ * That means that once we get to REV_TREE_DIFFERENT, we do not
+ * have to look any further.
  */
 static int tree_difference = REV_TREE_SAME;
 
 static void file_add_remove(struct diff_options *options,
                    int addremove, unsigned mode,
                    const unsigned char *sha1,
-                   const char *fullpath)
+                   const char *fullpath, unsigned dirty_submodule)
 {
-       int diff = REV_TREE_DIFFERENT;
+       int diff = addremove == '+' ? REV_TREE_NEW : REV_TREE_OLD;
 
-       /*
-        * Is it an add of a new file? It means that the old tree
-        * didn't have it at all, so we will turn "REV_TREE_SAME" ->
-        * "REV_TREE_NEW", but leave any "REV_TREE_DIFFERENT" alone
-        * (and if it already was "REV_TREE_NEW", we'll keep it
-        * "REV_TREE_NEW" of course).
-        */
-       if (addremove == '+') {
-               diff = tree_difference;
-               if (diff != REV_TREE_SAME)
-                       return;
-               diff = REV_TREE_NEW;
-       }
-       tree_difference = diff;
+       tree_difference |= diff;
        if (tree_difference == REV_TREE_DIFFERENT)
                DIFF_OPT_SET(options, HAS_CHANGES);
 }
@@ -286,18 +291,41 @@ static void file_change(struct diff_options *options,
                 unsigned old_mode, unsigned new_mode,
                 const unsigned char *old_sha1,
                 const unsigned char *new_sha1,
-                const char *fullpath)
+                const char *fullpath,
+                unsigned old_dirty_submodule, unsigned new_dirty_submodule)
 {
        tree_difference = REV_TREE_DIFFERENT;
        DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
-static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree *t2)
+static int rev_compare_tree(struct rev_info *revs, struct commit *parent, struct commit *commit)
 {
+       struct tree *t1 = parent->tree;
+       struct tree *t2 = commit->tree;
+
        if (!t1)
                return REV_TREE_NEW;
        if (!t2)
-               return REV_TREE_DIFFERENT;
+               return REV_TREE_OLD;
+
+       if (revs->simplify_by_decoration) {
+               /*
+                * If we are simplifying by decoration, then the commit
+                * is worth showing if it has a tag pointing at it.
+                */
+               if (lookup_decoration(&name_decoration, &commit->object))
+                       return REV_TREE_DIFFERENT;
+               /*
+                * A commit that is not pointed by a tag is uninteresting
+                * if we are not limited by path.  This means that you will
+                * see the usual "commits that touch the paths" plus any
+                * tagged commit by specifying both --simplify-by-decoration
+                * and pathspec.
+                */
+               if (!revs->prune_data)
+                       return REV_TREE_SAME;
+       }
+
        tree_difference = REV_TREE_SAME;
        DIFF_OPT_CLR(&revs->pruning, HAS_CHANGES);
        if (diff_tree_sha1(t1->object.sha1, t2->object.sha1, "",
@@ -306,12 +334,13 @@ static int rev_compare_tree(struct rev_info *revs, struct tree *t1, struct tree
        return tree_difference;
 }
 
-static int rev_same_tree_as_empty(struct rev_info *revs, struct tree *t1)
+static int rev_same_tree_as_empty(struct rev_info *revs, struct commit *commit)
 {
        int retval;
        void *tree;
        unsigned long size;
        struct tree_desc empty, real;
+       struct tree *t1 = commit->tree;
 
        if (!t1)
                return 0;
@@ -345,7 +374,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                return;
 
        if (!commit->parents) {
-               if (rev_same_tree_as_empty(revs, commit->tree))
+               if (rev_same_tree_as_empty(revs, commit))
                        commit->object.flags |= TREESAME;
                return;
        }
@@ -365,7 +394,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                        die("cannot simplify commit %s (because of %s)",
                            sha1_to_hex(commit->object.sha1),
                            sha1_to_hex(p->object.sha1));
-               switch (rev_compare_tree(revs, p->tree, commit->tree)) {
+               switch (rev_compare_tree(revs, p, commit)) {
                case REV_TREE_SAME:
                        tree_same = 1;
                        if (!revs->simplify_history || (p->object.flags & UNINTERESTING)) {
@@ -385,7 +414,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
 
                case REV_TREE_NEW:
                        if (revs->remove_empty_trees &&
-                           rev_same_tree_as_empty(revs, p->tree)) {
+                           rev_same_tree_as_empty(revs, p)) {
                                /* We are adding all the specified
                                 * paths from this parent, so the
                                 * history beyond this parent is not
@@ -401,6 +430,7 @@ static void try_to_simplify_commit(struct rev_info *revs, struct commit *commit)
                                p->parents = NULL;
                        }
                /* fallthrough */
+               case REV_TREE_OLD:
                case REV_TREE_DIFFERENT:
                        tree_changed = 1;
                        pp = &parent->next;
@@ -454,9 +484,10 @@ static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
                while (parent) {
                        struct commit *p = parent->item;
                        parent = parent->next;
+                       if (p)
+                               p->object.flags |= UNINTERESTING;
                        if (parse_commit(p) < 0)
-                               return -1;
-                       p->object.flags |= UNINTERESTING;
+                               continue;
                        if (p->parents)
                                mark_parents_uninteresting(p);
                        if (p->object.flags & SEEN)
@@ -484,12 +515,14 @@ static int add_parents_to_list(struct rev_info *revs, struct commit *commit,
 
                if (parse_commit(p) < 0)
                        return -1;
+               if (revs->show_source && !p->util)
+                       p->util = commit->util;
                p->object.flags |= left_flag;
                if (!(p->object.flags & SEEN)) {
                        p->object.flags |= SEEN;
                        insert_by_date_cached(p, list, cached_base, cache_ptr);
                }
-               if(revs->first_parent_only)
+               if (revs->first_parent_only)
                        break;
        }
        return 0;
@@ -680,12 +713,18 @@ static int handle_one_ref(const char *path, const unsigned char *sha1, int flag,
        return 0;
 }
 
+static void init_all_refs_cb(struct all_refs_cb *cb, struct rev_info *revs,
+       unsigned flags)
+{
+       cb->all_revs = revs;
+       cb->all_flags = flags;
+}
+
 static void handle_refs(struct rev_info *revs, unsigned flags,
                int (*for_each)(each_ref_fn, void *))
 {
        struct all_refs_cb cb;
-       cb.all_revs = revs;
-       cb.all_flags = flags;
+       init_all_refs_cb(&cb, revs, flags);
        for_each(handle_one_ref, &cb);
 }
 
@@ -772,7 +811,7 @@ void init_revisions(struct rev_info *revs, const char *prefix)
        revs->ignore_merges = 1;
        revs->simplify_history = 1;
        DIFF_OPT_SET(&revs->pruning, RECURSIVE);
-       DIFF_OPT_SET(&revs->pruning, QUIET);
+       DIFF_OPT_SET(&revs->pruning, QUICK);
        revs->pruning.add_remove = file_add_remove;
        revs->pruning.change = file_change;
        revs->lifo = 1;
@@ -785,6 +824,10 @@ void init_revisions(struct rev_info *revs, const char *prefix)
 
        revs->commit_format = CMIT_FMT_DEFAULT;
 
+       revs->grep_filter.status_only = 1;
+       revs->grep_filter.pattern_tail = &(revs->grep_filter.pattern_list);
+       revs->grep_filter.regflags = REG_NEWLINE;
+
        diff_setup(&revs->diffopt);
        if (prefix && !revs->diffopt.prefix) {
                revs->diffopt.prefix = prefix;
@@ -930,52 +973,69 @@ int handle_revision_arg(const char *arg, struct rev_info *revs,
        return 0;
 }
 
-void read_revisions_from_stdin(struct rev_info *revs)
+static void read_pathspec_from_stdin(struct rev_info *revs, struct strbuf *sb, const char ***prune_data)
 {
-       char line[1000];
+       const char **prune = *prune_data;
+       int prune_nr;
+       int prune_alloc;
 
-       while (fgets(line, sizeof(line), stdin) != NULL) {
-               int len = strlen(line);
-               if (len && line[len - 1] == '\n')
-                       line[--len] = '\0';
+       /* count existing ones */
+       if (!prune)
+               prune_nr = 0;
+       else
+               for (prune_nr = 0; prune[prune_nr]; prune_nr++)
+                       ;
+       prune_alloc = prune_nr; /* not really, but we do not know */
+
+       while (strbuf_getwholeline(sb, stdin, '\n') != EOF) {
+               int len = sb->len;
+               if (len && sb->buf[len - 1] == '\n')
+                       sb->buf[--len] = '\0';
+               ALLOC_GROW(prune, prune_nr+1, prune_alloc);
+               prune[prune_nr++] = xstrdup(sb->buf);
+       }
+       if (prune) {
+               ALLOC_GROW(prune, prune_nr+1, prune_alloc);
+               prune[prune_nr] = NULL;
+       }
+       *prune_data = prune;
+}
+
+static void read_revisions_from_stdin(struct rev_info *revs, const char ***prune)
+{
+       struct strbuf sb;
+       int seen_dashdash = 0;
+
+       strbuf_init(&sb, 1000);
+       while (strbuf_getwholeline(&sb, stdin, '\n') != EOF) {
+               int len = sb.len;
+               if (len && sb.buf[len - 1] == '\n')
+                       sb.buf[--len] = '\0';
                if (!len)
                        break;
-               if (line[0] == '-')
+               if (sb.buf[0] == '-') {
+                       if (len == 2 && sb.buf[1] == '-') {
+                               seen_dashdash = 1;
+                               break;
+                       }
                        die("options not supported in --stdin mode");
-               if (handle_revision_arg(line, revs, 0, 1))
-                       die("bad revision '%s'", line);
+               }
+               if (handle_revision_arg(sb.buf, revs, 0, 1))
+                       die("bad revision '%s'", sb.buf);
        }
+       if (seen_dashdash)
+               read_pathspec_from_stdin(revs, &sb, prune);
+       strbuf_release(&sb);
 }
 
 static void add_grep(struct rev_info *revs, const char *ptn, enum grep_pat_token what)
 {
-       if (!revs->grep_filter) {
-               struct grep_opt *opt = xcalloc(1, sizeof(*opt));
-               opt->status_only = 1;
-               opt->pattern_tail = &(opt->pattern_list);
-               opt->regflags = REG_NEWLINE;
-               revs->grep_filter = opt;
-       }
-       append_grep_pattern(revs->grep_filter, ptn,
-                           "command line", 0, what);
+       append_grep_pattern(&revs->grep_filter, ptn, "command line", 0, what);
 }
 
-static void add_header_grep(struct rev_info *revs, const char *field, const char *pattern)
+static void add_header_grep(struct rev_info *revs, enum grep_header_field field, const char *pattern)
 {
-       char *pat;
-       const char *prefix;
-       int patlen, fldlen;
-
-       fldlen = strlen(field);
-       patlen = strlen(pattern);
-       pat = xmalloc(patlen + fldlen + 10);
-       prefix = ".*";
-       if (*pattern == '^') {
-               prefix = "";
-               pattern++;
-       }
-       sprintf(pat, "^%s %s%s", field, prefix, pattern);
-       add_grep(revs, pat, GREP_PATTERN_HEAD);
+       append_header_grep_pattern(&revs->grep_filter, field, pattern);
 }
 
 static void add_message_grep(struct rev_info *revs, const char *pattern)
@@ -983,16 +1043,6 @@ static void add_message_grep(struct rev_info *revs, const char *pattern)
        add_grep(revs, pattern, GREP_PATTERN_BODY);
 }
 
-static void add_ignore_packed(struct rev_info *revs, const char *name)
-{
-       int num = ++revs->num_ignore_packed;
-
-       revs->ignore_packed = xrealloc(revs->ignore_packed,
-                                      sizeof(const char **) * (num + 1));
-       revs->ignore_packed[num-1] = name;
-       revs->ignore_packed[num] = NULL;
-}
-
 static int handle_revision_opt(struct rev_info *revs, int argc, const char **argv,
                               int *unkc, const char **unkv)
 {
@@ -1002,7 +1052,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
        if (!strcmp(arg, "--all") || !strcmp(arg, "--branches") ||
            !strcmp(arg, "--tags") || !strcmp(arg, "--remotes") ||
            !strcmp(arg, "--reflog") || !strcmp(arg, "--not") ||
-           !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk"))
+           !strcmp(arg, "--no-walk") || !strcmp(arg, "--do-walk") ||
+           !strcmp(arg, "--bisect"))
        {
                unkv[(*unkc)++] = arg;
                return 1;
@@ -1048,6 +1099,19 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
        } else if (!strcmp(arg, "--topo-order")) {
                revs->lifo = 1;
                revs->topo_order = 1;
+       } else if (!strcmp(arg, "--simplify-merges")) {
+               revs->simplify_merges = 1;
+               revs->rewrite_parents = 1;
+               revs->simplify_history = 0;
+               revs->limited = 1;
+       } else if (!strcmp(arg, "--simplify-by-decoration")) {
+               revs->simplify_merges = 1;
+               revs->rewrite_parents = 1;
+               revs->simplify_history = 0;
+               revs->simplify_by_decoration = 1;
+               revs->limited = 1;
+               revs->prune = 1;
+               load_ref_decorations(DECORATE_SHORT_REFS);
        } else if (!strcmp(arg, "--date-order")) {
                revs->lifo = 0;
                revs->topo_order = 1;
@@ -1072,6 +1136,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->show_all = 1;
        } else if (!strcmp(arg, "--remove-empty")) {
                revs->remove_empty_trees = 1;
+       } else if (!strcmp(arg, "--merges")) {
+               revs->merges_only = 1;
        } else if (!strcmp(arg, "--no-merges")) {
                revs->no_merges = 1;
        } else if (!strcmp(arg, "--boundary")) {
@@ -1092,12 +1158,8 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->edge_hint = 1;
        } else if (!strcmp(arg, "--unpacked")) {
                revs->unpacked = 1;
-               free(revs->ignore_packed);
-               revs->ignore_packed = NULL;
-               revs->num_ignore_packed = 0;
        } else if (!prefixcmp(arg, "--unpacked=")) {
-               revs->unpacked = 1;
-               add_ignore_packed(revs, arg+11);
+               die("--unpacked=<packfile> no longer supported.");
        } else if (!strcmp(arg, "-r")) {
                revs->diff = 1;
                DIFF_OPT_SET(&revs->diffopt, RECURSIVE);
@@ -1119,10 +1181,23 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->verbose_header = 1;
        } else if (!strcmp(arg, "--pretty")) {
                revs->verbose_header = 1;
+               revs->pretty_given = 1;
                get_commit_format(arg+8, revs);
-       } else if (!prefixcmp(arg, "--pretty=")) {
+       } else if (!prefixcmp(arg, "--pretty=") || !prefixcmp(arg, "--format=")) {
                revs->verbose_header = 1;
+               revs->pretty_given = 1;
                get_commit_format(arg+9, revs);
+       } else if (!strcmp(arg, "--show-notes")) {
+               revs->show_notes = 1;
+               revs->show_notes_given = 1;
+       } else if (!strcmp(arg, "--no-notes")) {
+               revs->show_notes = 0;
+               revs->show_notes_given = 1;
+       } else if (!strcmp(arg, "--oneline")) {
+               revs->verbose_header = 1;
+               get_commit_format("oneline", revs);
+               revs->pretty_given = 1;
+               revs->abbrev_commit = 1;
        } else if (!strcmp(arg, "--graph")) {
                revs->topo_order = 1;
                revs->rewrite_parents = 1;
@@ -1152,8 +1227,10 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
                revs->simplify_history = 0;
        } else if (!strcmp(arg, "--relative-date")) {
                revs->date_mode = DATE_RELATIVE;
+               revs->date_mode_explicit = 1;
        } else if (!strncmp(arg, "--date=", 7)) {
                revs->date_mode = parse_date_format(arg + 7);
+               revs->date_mode_explicit = 1;
        } else if (!strcmp(arg, "--log-size")) {
                revs->show_log_size = 1;
        }
@@ -1161,23 +1238,19 @@ static int handle_revision_opt(struct rev_info *revs, int argc, const char **arg
         * Grepping the commit log
         */
        else if (!prefixcmp(arg, "--author=")) {
-               add_header_grep(revs, "author", arg+9);
+               add_header_grep(revs, GREP_HEADER_AUTHOR, arg+9);
        } else if (!prefixcmp(arg, "--committer=")) {
-               add_header_grep(revs, "committer", arg+12);
+               add_header_grep(revs, GREP_HEADER_COMMITTER, arg+12);
        } else if (!prefixcmp(arg, "--grep=")) {
                add_message_grep(revs, arg+7);
        } else if (!strcmp(arg, "--extended-regexp") || !strcmp(arg, "-E")) {
-               if (revs->grep_filter)
-                       revs->grep_filter->regflags |= REG_EXTENDED;
+               revs->grep_filter.regflags |= REG_EXTENDED;
        } else if (!strcmp(arg, "--regexp-ignore-case") || !strcmp(arg, "-i")) {
-               if (revs->grep_filter)
-                       revs->grep_filter->regflags |= REG_ICASE;
+               revs->grep_filter.regflags |= REG_ICASE;
        } else if (!strcmp(arg, "--fixed-strings") || !strcmp(arg, "-F")) {
-               if (revs->grep_filter)
-                       revs->grep_filter->fixed = 1;
+               revs->grep_filter.fixed = 1;
        } else if (!strcmp(arg, "--all-match")) {
-               if (revs->grep_filter)
-                       revs->grep_filter->all_match = 1;
+               revs->grep_filter.all_match = 1;
        } else if (!prefixcmp(arg, "--encoding=")) {
                arg += 11;
                if (strcmp(arg, "none"))
@@ -1213,6 +1286,44 @@ void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
        ctx->argc -= n;
 }
 
+static int for_each_bad_bisect_ref(each_ref_fn fn, void *cb_data)
+{
+       return for_each_ref_in("refs/bisect/bad", fn, cb_data);
+}
+
+static int for_each_good_bisect_ref(each_ref_fn fn, void *cb_data)
+{
+       return for_each_ref_in("refs/bisect/good", fn, cb_data);
+}
+
+static void append_prune_data(const char ***prune_data, const char **av)
+{
+       const char **prune = *prune_data;
+       int prune_nr;
+       int prune_alloc;
+
+       if (!prune) {
+               *prune_data = av;
+               return;
+       }
+
+       /* count existing ones */
+       for (prune_nr = 0; prune[prune_nr]; prune_nr++)
+               ;
+       prune_alloc = prune_nr; /* not really, but we do not know */
+
+       while (*av) {
+               ALLOC_GROW(prune, prune_nr+1, prune_alloc);
+               prune[prune_nr++] = *av;
+               av++;
+       }
+       if (prune) {
+               ALLOC_GROW(prune, prune_nr+1, prune_alloc);
+               prune[prune_nr] = NULL;
+       }
+       *prune_data = prune;
+}
+
 /*
  * Parse revision information, filling in the "rev_info" structure,
  * and removing the used arguments from the argument list.
@@ -1222,7 +1333,8 @@ void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
  */
 int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def)
 {
-       int i, flags, left, seen_dashdash;
+       int i, flags, left, seen_dashdash, read_from_stdin;
+       const char **prune_data = NULL;
 
        /* First, search for "--" */
        seen_dashdash = 0;
@@ -1233,13 +1345,14 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                argv[i] = NULL;
                argc = i;
                if (argv[i + 1])
-                       revs->prune_data = get_pathspec(revs->prefix, argv + i + 1);
+                       prune_data = argv + i + 1;
                seen_dashdash = 1;
                break;
        }
 
        /* Second, deal with arguments and options */
        flags = 0;
+       read_from_stdin = 0;
        for (left = i = 1; i < argc; i++) {
                const char *arg = argv[i];
                if (*arg == '-') {
@@ -1247,12 +1360,19 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 
                        if (!strcmp(arg, "--all")) {
                                handle_refs(revs, flags, for_each_ref);
+                               handle_refs(revs, flags, head_ref);
                                continue;
                        }
                        if (!strcmp(arg, "--branches")) {
                                handle_refs(revs, flags, for_each_branch_ref);
                                continue;
                        }
+                       if (!strcmp(arg, "--bisect")) {
+                               handle_refs(revs, flags, for_each_bad_bisect_ref);
+                               handle_refs(revs, flags ^ UNINTERESTING, for_each_good_bisect_ref);
+                               revs->bisect = 1;
+                               continue;
+                       }
                        if (!strcmp(arg, "--tags")) {
                                handle_refs(revs, flags, for_each_tag_ref);
                                continue;
@@ -1261,6 +1381,30 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                                handle_refs(revs, flags, for_each_remote_ref);
                                continue;
                        }
+                       if (!prefixcmp(arg, "--glob=")) {
+                               struct all_refs_cb cb;
+                               init_all_refs_cb(&cb, revs, flags);
+                               for_each_glob_ref(handle_one_ref, arg + 7, &cb);
+                               continue;
+                       }
+                       if (!prefixcmp(arg, "--branches=")) {
+                               struct all_refs_cb cb;
+                               init_all_refs_cb(&cb, revs, flags);
+                               for_each_glob_ref_in(handle_one_ref, arg + 11, "refs/heads/", &cb);
+                               continue;
+                       }
+                       if (!prefixcmp(arg, "--tags=")) {
+                               struct all_refs_cb cb;
+                               init_all_refs_cb(&cb, revs, flags);
+                               for_each_glob_ref_in(handle_one_ref, arg + 7, "refs/tags/", &cb);
+                               continue;
+                       }
+                       if (!prefixcmp(arg, "--remotes=")) {
+                               struct all_refs_cb cb;
+                               init_all_refs_cb(&cb, revs, flags);
+                               for_each_glob_ref_in(handle_one_ref, arg + 10, "refs/remotes/", &cb);
+                               continue;
+                       }
                        if (!strcmp(arg, "--reflog")) {
                                handle_reflog(revs, flags);
                                continue;
@@ -1277,6 +1421,16 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                                revs->no_walk = 0;
                                continue;
                        }
+                       if (!strcmp(arg, "--stdin")) {
+                               if (revs->disable_stdin) {
+                                       argv[left++] = arg;
+                                       continue;
+                               }
+                               if (read_from_stdin++)
+                                       die("--stdin given twice?");
+                               read_revisions_from_stdin(revs, &prune_data);
+                               continue;
+                       }
 
                        opts = handle_revision_opt(revs, argc - i, argv + i, &left, argv);
                        if (opts > 0) {
@@ -1302,12 +1456,14 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
                        for (j = i; j < argc; j++)
                                verify_filename(revs->prefix, argv[j]);
 
-                       revs->prune_data = get_pathspec(revs->prefix,
-                                                       argv + i);
+                       append_prune_data(&prune_data, argv + i);
                        break;
                }
        }
 
+       if (prune_data)
+               revs->prune_data = get_pathspec(revs->prefix, prune_data);
+
        if (revs->def == NULL)
                revs->def = def;
        if (revs->show_merge)
@@ -1352,9 +1508,7 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
        if (diff_setup_done(&revs->diffopt) < 0)
                die("diff_setup_done failed");
 
-       if (revs->grep_filter) {
-               compile_grep_patterns(revs->grep_filter);
-       }
+       compile_grep_patterns(&revs->grep_filter);
 
        if (revs->reverse && revs->reflog_info)
                die("cannot combine --reverse with --walk-reflogs");
@@ -1381,6 +1535,179 @@ static void add_child(struct rev_info *revs, struct commit *parent, struct commi
        l->next = add_decoration(&revs->children, &parent->object, l);
 }
 
+static int remove_duplicate_parents(struct commit *commit)
+{
+       struct commit_list **pp, *p;
+       int surviving_parents;
+
+       /* Examine existing parents while marking ones we have seen... */
+       pp = &commit->parents;
+       while ((p = *pp) != NULL) {
+               struct commit *parent = p->item;
+               if (parent->object.flags & TMP_MARK) {
+                       *pp = p->next;
+                       continue;
+               }
+               parent->object.flags |= TMP_MARK;
+               pp = &p->next;
+       }
+       /* count them while clearing the temporary mark */
+       surviving_parents = 0;
+       for (p = commit->parents; p; p = p->next) {
+               p->item->object.flags &= ~TMP_MARK;
+               surviving_parents++;
+       }
+       return surviving_parents;
+}
+
+struct merge_simplify_state {
+       struct commit *simplified;
+};
+
+static struct merge_simplify_state *locate_simplify_state(struct rev_info *revs, struct commit *commit)
+{
+       struct merge_simplify_state *st;
+
+       st = lookup_decoration(&revs->merge_simplification, &commit->object);
+       if (!st) {
+               st = xcalloc(1, sizeof(*st));
+               add_decoration(&revs->merge_simplification, &commit->object, st);
+       }
+       return st;
+}
+
+static struct commit_list **simplify_one(struct rev_info *revs, struct commit *commit, struct commit_list **tail)
+{
+       struct commit_list *p;
+       struct merge_simplify_state *st, *pst;
+       int cnt;
+
+       st = locate_simplify_state(revs, commit);
+
+       /*
+        * Have we handled this one?
+        */
+       if (st->simplified)
+               return tail;
+
+       /*
+        * An UNINTERESTING commit simplifies to itself, so does a
+        * root commit.  We do not rewrite parents of such commit
+        * anyway.
+        */
+       if ((commit->object.flags & UNINTERESTING) || !commit->parents) {
+               st->simplified = commit;
+               return tail;
+       }
+
+       /*
+        * Do we know what commit all of our parents should be rewritten to?
+        * Otherwise we are not ready to rewrite this one yet.
+        */
+       for (cnt = 0, p = commit->parents; p; p = p->next) {
+               pst = locate_simplify_state(revs, p->item);
+               if (!pst->simplified) {
+                       tail = &commit_list_insert(p->item, tail)->next;
+                       cnt++;
+               }
+       }
+       if (cnt) {
+               tail = &commit_list_insert(commit, tail)->next;
+               return tail;
+       }
+
+       /*
+        * Rewrite our list of parents.
+        */
+       for (p = commit->parents; p; p = p->next) {
+               pst = locate_simplify_state(revs, p->item);
+               p->item = pst->simplified;
+       }
+       cnt = remove_duplicate_parents(commit);
+
+       /*
+        * It is possible that we are a merge and one side branch
+        * does not have any commit that touches the given paths;
+        * in such a case, the immediate parents will be rewritten
+        * to different commits.
+        *
+        *      o----X          X: the commit we are looking at;
+        *     /    /           o: a commit that touches the paths;
+        * ---o----'
+        *
+        * Further reduce the parents by removing redundant parents.
+        */
+       if (1 < cnt) {
+               struct commit_list *h = reduce_heads(commit->parents);
+               cnt = commit_list_count(h);
+               free_commit_list(commit->parents);
+               commit->parents = h;
+       }
+
+       /*
+        * A commit simplifies to itself if it is a root, if it is
+        * UNINTERESTING, if it touches the given paths, or if it is a
+        * merge and its parents simplifies to more than one commits
+        * (the first two cases are already handled at the beginning of
+        * this function).
+        *
+        * Otherwise, it simplifies to what its sole parent simplifies to.
+        */
+       if (!cnt ||
+           (commit->object.flags & UNINTERESTING) ||
+           !(commit->object.flags & TREESAME) ||
+           (1 < cnt))
+               st->simplified = commit;
+       else {
+               pst = locate_simplify_state(revs, commit->parents->item);
+               st->simplified = pst->simplified;
+       }
+       return tail;
+}
+
+static void simplify_merges(struct rev_info *revs)
+{
+       struct commit_list *list;
+       struct commit_list *yet_to_do, **tail;
+
+       if (!revs->topo_order)
+               sort_in_topological_order(&revs->commits, revs->lifo);
+       if (!revs->prune)
+               return;
+
+       /* feed the list reversed */
+       yet_to_do = NULL;
+       for (list = revs->commits; list; list = list->next)
+               commit_list_insert(list->item, &yet_to_do);
+       while (yet_to_do) {
+               list = yet_to_do;
+               yet_to_do = NULL;
+               tail = &yet_to_do;
+               while (list) {
+                       struct commit *commit = list->item;
+                       struct commit_list *next = list->next;
+                       free(list);
+                       list = next;
+                       tail = simplify_one(revs, commit, tail);
+               }
+       }
+
+       /* clean up the result, removing the simplified ones */
+       list = revs->commits;
+       revs->commits = NULL;
+       tail = &revs->commits;
+       while (list) {
+               struct commit *commit = list->item;
+               struct commit_list *next = list->next;
+               struct merge_simplify_state *st;
+               free(list);
+               list = next;
+               st = locate_simplify_state(revs, commit);
+               if (st->simplified == commit)
+                       tail = &commit_list_insert(commit, tail)->next;
+       }
+}
+
 static void set_children(struct rev_info *revs)
 {
        struct commit_list *l;
@@ -1421,6 +1748,8 @@ int prepare_revision_walk(struct rev_info *revs)
                        return -1;
        if (revs->topo_order)
                sort_in_topological_order(&revs->commits, revs->lifo);
+       if (revs->simplify_merges)
+               simplify_merges(revs);
        if (revs->children.name)
                set_children(revs);
        return 0;
@@ -1453,26 +1782,6 @@ static enum rewrite_result rewrite_one(struct rev_info *revs, struct commit **pp
        }
 }
 
-static void remove_duplicate_parents(struct commit *commit)
-{
-       struct commit_list **pp, *p;
-
-       /* Examine existing parents while marking ones we have seen... */
-       pp = &commit->parents;
-       while ((p = *pp) != NULL) {
-               struct commit *parent = p->item;
-               if (parent->object.flags & TMP_MARK) {
-                       *pp = p->next;
-                       continue;
-               }
-               parent->object.flags |= TMP_MARK;
-               pp = &p->next;
-       }
-       /* ... and clear the temporary mark */
-       for (p = commit->parents; p; p = p->next)
-               p->item->object.flags &= ~TMP_MARK;
-}
-
 static int rewrite_parents(struct rev_info *revs, struct commit *commit)
 {
        struct commit_list **pp = &commit->parents;
@@ -1495,9 +1804,9 @@ static int rewrite_parents(struct rev_info *revs, struct commit *commit)
 
 static int commit_match(struct commit *commit, struct rev_info *opt)
 {
-       if (!opt->grep_filter)
+       if (!opt->grep_filter.pattern_list)
                return 1;
-       return grep_buffer(opt->grep_filter,
+       return grep_buffer(&opt->grep_filter,
                           NULL, /* we say nothing, not even filename */
                           commit->buffer, strlen(commit->buffer));
 }
@@ -1507,11 +1816,11 @@ static inline int want_ancestry(struct rev_info *revs)
        return (revs->rewrite_parents || revs->children.name);
 }
 
-enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
+enum commit_action get_commit_action(struct rev_info *revs, struct commit *commit)
 {
        if (commit->object.flags & SHOWN)
                return commit_ignore;
-       if (revs->unpacked && has_sha1_pack(commit->object.sha1, revs->ignore_packed))
+       if (revs->unpacked && has_sha1_pack(commit->object.sha1))
                return commit_ignore;
        if (revs->show_all)
                return commit_show;
@@ -1521,6 +1830,8 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
                return commit_ignore;
        if (revs->no_merges && commit->parents && commit->parents->next)
                return commit_ignore;
+       if (revs->merges_only && !(commit->parents && commit->parents->next))
+               return commit_ignore;
        if (!commit_match(commit, revs))
                return commit_ignore;
        if (revs->prune && revs->dense) {
@@ -1533,12 +1844,23 @@ enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
                        if (!commit->parents || !commit->parents->next)
                                return commit_ignore;
                }
-               if (want_ancestry(revs) && rewrite_parents(revs, commit) < 0)
-                       return commit_error;
        }
        return commit_show;
 }
 
+enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit)
+{
+       enum commit_action action = get_commit_action(revs, commit);
+
+       if (action == commit_show &&
+           !revs->show_all &&
+           revs->prune && revs->dense && want_ancestry(revs)) {
+               if (rewrite_parents(revs, commit) < 0)
+                       return commit_error;
+       }
+       return action;
+}
+
 static struct commit *get_revision_1(struct rev_info *revs)
 {
        if (!revs->commits)
@@ -1564,14 +1886,16 @@ static struct commit *get_revision_1(struct rev_info *revs)
                            (commit->date < revs->max_age))
                                continue;
                        if (add_parents_to_list(revs, commit, &revs->commits, NULL) < 0)
-                               return NULL;
+                               die("Failed to traverse parents of commit %s",
+                                   sha1_to_hex(commit->object.sha1));
                }
 
                switch (simplify_commit(revs, commit)) {
                case commit_ignore:
                        continue;
                case commit_error:
-                       return NULL;
+                       die("Failed to simplify parents of commit %s",
+                           sha1_to_hex(commit->object.sha1));
                default:
                        return commit;
                }
@@ -1659,26 +1983,6 @@ static struct commit *get_revision_internal(struct rev_info *revs)
                return c;
        }
 
-       if (revs->reverse) {
-               int limit = -1;
-
-               if (0 <= revs->max_count) {
-                       limit = revs->max_count;
-                       if (0 < revs->skip_count)
-                               limit += revs->skip_count;
-               }
-               l = NULL;
-               while ((c = get_revision_1(revs))) {
-                       commit_list_insert(c, &l);
-                       if ((0 < limit) && !--limit)
-                               break;
-               }
-               revs->commits = l;
-               revs->reverse = 0;
-               revs->max_count = -1;
-               c = NULL;
-       }
-
        /*
         * Now pick up what they want to give us
         */
@@ -1751,7 +2055,23 @@ static struct commit *get_revision_internal(struct rev_info *revs)
 
 struct commit *get_revision(struct rev_info *revs)
 {
-       struct commit *c = get_revision_internal(revs);
+       struct commit *c;
+       struct commit_list *reversed;
+
+       if (revs->reverse) {
+               reversed = NULL;
+               while ((c = get_revision_internal(revs))) {
+                       commit_list_insert(c, &reversed);
+               }
+               revs->commits = reversed;
+               revs->reverse = 0;
+               revs->reverse_output_stage = 1;
+       }
+
+       if (revs->reverse_output_stage)
+               return pop_commit(&revs->commits);
+
+       c = get_revision_internal(revs);
        if (c && revs->graph)
                graph_update(revs->graph, c);
        return c;