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ab580acea4
This introduces an in-place topological sort procedure to commit.c.
Given a list of commits, sort_in_topological_order() will perform an in-place
topological sort of that list.
The invariant that applies to the resulting list is:
a reachable from b => ord(b) < ord(a)
This invariant is weaker than the --merge-order invariant, but is cheaper
to calculate (assuming the list has been identified) and will serve any
purpose where only a minimal topological order guarantee is required.
Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#ifndef COMMIT_H
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#define COMMIT_H
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#include "object.h"
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#include "tree.h"
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struct commit_list {
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struct commit *item;
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struct commit_list *next;
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};
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struct commit {
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struct object object;
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unsigned long date;
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struct commit_list *parents;
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struct tree *tree;
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char *buffer;
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};
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extern const char *commit_type;
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struct commit *lookup_commit(const unsigned char *sha1);
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struct commit *lookup_commit_reference(const unsigned char *sha1);
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int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size);
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int parse_commit(struct commit *item);
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struct commit_list * commit_list_insert(struct commit *item, struct commit_list **list_p);
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struct commit_list * insert_by_date(struct commit *item, struct commit_list **list);
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void free_commit_list(struct commit_list *list);
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void sort_by_date(struct commit_list **list);
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/* Commit formats */
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enum cmit_fmt {
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CMIT_FMT_RAW,
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CMIT_FMT_MEDIUM,
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CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
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CMIT_FMT_SHORT,
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CMIT_FMT_FULL,
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};
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extern enum cmit_fmt get_commit_format(const char *arg);
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extern unsigned long pretty_print_commit(enum cmit_fmt fmt, const char *msg, unsigned long len, char *buf, unsigned long space);
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/** Removes the first commit from a list sorted by date, and adds all
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* of its parents.
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**/
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struct commit *pop_most_recent_commit(struct commit_list **list,
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unsigned int mark);
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struct commit *pop_commit(struct commit_list **stack);
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int count_parents(struct commit * commit);
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/*
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* Performs an in-place topological sort of list supplied.
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*
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* Pre-conditions:
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* all commits in input list and all parents of those
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* commits must have object.util == NULL
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*
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* Post-conditions:
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* invariant of resulting list is:
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* a reachable from b => ord(b) < ord(a)
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*/
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void sort_in_topological_order(struct commit_list ** list);
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#endif /* COMMIT_H */
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