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6546b5931e
The --full-history traversal keeps all merges in addition to non-merge
commits that touch paths in the given pathspec. This is useful to view
both sides of a merge in a topology like this:
A---M---o
/ /
---O---B
even when A and B makes identical change to the given paths. The revision
traversal without --full-history aims to come up with the simplest history
to explain the final state of the tree, and one of the side branches can
be pruned away.
The behaviour to keep all merges however is inconvenient if neither A nor
B touches the paths we are interested in. --full-history reduces the
topology to:
---O---M---o
in such a case, without removing M.
This adds a post processing phase on top of --full-history traversal to
remove needless merges from the resulting history.
The idea is to compute, for each commit in the "full history" result set,
the commit that should replace it in the simplified history. The commit
to replace it in the final history is determined as follows:
* In any case, we first figure out the replacement commits of parents of
the commit we are looking at. The commit we are looking at is
rewritten as if the replacement commits of its original parents are its
parents. While doing so, we reduce the redundant parents from the
rewritten parent list by not just removing the identical ones, but also
removing a parent that is an ancestor of another parent.
* After the above parent simplification, if the commit is a root commit,
an UNINTERESTING commit, a merge commit, or modifies the paths we are
interested in, then the replacement commit of the commit is itself. In
other words, such a commit is not dropped from the final result.
The first point above essentially means that the history is rewritten in
the bottom up direction. We can rewrite the parent list of a commit only
after we know how all of its parents are rewritten. This means that the
processing needs to happen on the full history (i.e. after limit_list()).
Signed-off-by: Junio C Hamano <gitster@pobox.com>
161 lines
3.8 KiB
C
161 lines
3.8 KiB
C
#ifndef REVISION_H
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#define REVISION_H
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#include "parse-options.h"
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#define SEEN (1u<<0)
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#define UNINTERESTING (1u<<1)
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#define TREESAME (1u<<2)
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#define SHOWN (1u<<3)
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#define TMP_MARK (1u<<4) /* for isolated cases; clean after use */
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#define BOUNDARY (1u<<5)
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#define CHILD_SHOWN (1u<<6)
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#define ADDED (1u<<7) /* Parents already parsed and added? */
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#define SYMMETRIC_LEFT (1u<<8)
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#define ALL_REV_FLAGS ((1u<<9)-1)
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struct rev_info;
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struct log_info;
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struct rev_info {
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/* Starting list */
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struct commit_list *commits;
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struct object_array pending;
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/* Parents of shown commits */
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struct object_array boundary_commits;
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/* Basic information */
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const char *prefix;
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const char *def;
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void *prune_data;
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unsigned int early_output;
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/* Traversal flags */
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unsigned int dense:1,
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prune:1,
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no_merges:1,
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no_walk:1,
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show_all:1,
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remove_empty_trees:1,
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simplify_history:1,
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lifo:1,
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topo_order:1,
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simplify_merges:1,
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tag_objects:1,
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tree_objects:1,
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blob_objects:1,
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edge_hint:1,
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limited:1,
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unpacked:1, /* see also ignore_packed below */
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boundary:2,
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left_right:1,
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rewrite_parents:1,
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print_parents:1,
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reverse:1,
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cherry_pick:1,
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first_parent_only:1;
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/* Diff flags */
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unsigned int diff:1,
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full_diff:1,
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show_root_diff:1,
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no_commit_id:1,
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verbose_header:1,
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ignore_merges:1,
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combine_merges:1,
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dense_combined_merges:1,
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always_show_header:1;
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/* Format info */
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unsigned int shown_one:1,
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show_merge:1,
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abbrev_commit:1,
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use_terminator:1,
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missing_newline:1;
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enum date_mode date_mode;
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const char **ignore_packed; /* pretend objects in these are unpacked */
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int num_ignore_packed;
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unsigned int abbrev;
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enum cmit_fmt commit_format;
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struct log_info *loginfo;
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int nr, total;
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const char *mime_boundary;
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char *message_id;
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const char *ref_message_id;
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const char *add_signoff;
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const char *extra_headers;
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const char *log_reencode;
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const char *subject_prefix;
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int no_inline;
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int show_log_size;
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/* Filter by commit log message */
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struct grep_opt *grep_filter;
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/* Display history graph */
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struct git_graph *graph;
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/* special limits */
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int skip_count;
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int max_count;
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unsigned long max_age;
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unsigned long min_age;
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/* diff info for patches and for paths limiting */
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struct diff_options diffopt;
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struct diff_options pruning;
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struct reflog_walk_info *reflog_info;
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struct decoration children;
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};
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#define REV_TREE_SAME 0
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#define REV_TREE_NEW 1
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#define REV_TREE_DIFFERENT 2
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/* revision.c */
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void read_revisions_from_stdin(struct rev_info *revs);
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typedef void (*show_early_output_fn_t)(struct rev_info *, struct commit_list *);
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volatile show_early_output_fn_t show_early_output;
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extern void init_revisions(struct rev_info *revs, const char *prefix);
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extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def);
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extern void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
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const struct option *options,
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const char * const usagestr[]);
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extern int handle_revision_arg(const char *arg, struct rev_info *revs,int flags,int cant_be_filename);
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extern int prepare_revision_walk(struct rev_info *revs);
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extern struct commit *get_revision(struct rev_info *revs);
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extern void mark_parents_uninteresting(struct commit *commit);
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extern void mark_tree_uninteresting(struct tree *tree);
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struct name_path {
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struct name_path *up;
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int elem_len;
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const char *elem;
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};
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extern void add_object(struct object *obj,
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struct object_array *p,
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struct name_path *path,
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const char *name);
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extern void add_pending_object(struct rev_info *revs, struct object *obj, const char *name);
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extern void add_head_to_pending(struct rev_info *);
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enum commit_action {
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commit_ignore,
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commit_show,
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commit_error
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};
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extern enum commit_action simplify_commit(struct rev_info *revs, struct commit *commit);
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#endif
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