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25e5e2bf85
This teaches combine-diff machinery to feed a combined merge to a callback function when DIFF_FORMAT_CALLBACK is specified. So far, format callback functions are not used for anything but 2-way diffs. A callback is given a diff_queue_struct, which is an array of diff_filepair. As its name suggests, a diff_filepair is a _pair_ of diff_filespec that represents a single preimage and a single postimage. Since "diff -c" is to compare N parents with a single merge result and filter out any paths whose result match one (or more) of the parent(s), its output has to be able to represent N preimages and 1 postimage. For this reason, a callback function that inspects a diff_filepair that results from this new infrastructure can and is expected to view the preimage side (i.e. pair->one) as an array of diff_filespec. Each element in the array, except for the last one, is marked with "has_more_entries" bit, so that the same callback function can be used for 2-way diffs and combined diffs. Signed-off-by: Junio C Hamano <gitster@pobox.com>
132 lines
4.4 KiB
C
132 lines
4.4 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#ifndef DIFFCORE_H
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#define DIFFCORE_H
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/* This header file is internal between diff.c and its diff transformers
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* (e.g. diffcore-rename, diffcore-pickaxe). Never include this header
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* in anything else.
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*/
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/* We internally use unsigned short as the score value,
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* and rely on an int capable to hold 32-bits. -B can take
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* -Bmerge_score/break_score format and the two scores are
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* passed around in one int (high 16-bit for merge and low 16-bit
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* for break).
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*/
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#define MAX_SCORE 60000.0
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#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
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#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */
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#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen (60%) */
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#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
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struct userdiff_driver;
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struct diff_filespec {
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unsigned char sha1[20];
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char *path;
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void *data;
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void *cnt_data;
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const char *funcname_pattern_ident;
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unsigned long size;
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int count; /* Reference count */
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int xfrm_flags; /* for use by the xfrm */
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int rename_used; /* Count of rename users */
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unsigned short mode; /* file mode */
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unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
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* if false, use the name and read from
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* the filesystem.
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*/
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#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
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unsigned should_free : 1; /* data should be free()'ed */
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unsigned should_munmap : 1; /* data should be munmap()'ed */
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unsigned dirty_submodule : 2; /* For submodules: its work tree is dirty */
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#define DIRTY_SUBMODULE_UNTRACKED 1
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#define DIRTY_SUBMODULE_MODIFIED 2
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unsigned has_more_entries : 1; /* only appear in combined diff */
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struct userdiff_driver *driver;
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/* data should be considered "binary"; -1 means "don't know yet" */
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int is_binary;
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};
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extern struct diff_filespec *alloc_filespec(const char *);
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extern void free_filespec(struct diff_filespec *);
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extern void fill_filespec(struct diff_filespec *, const unsigned char *,
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unsigned short);
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extern int diff_populate_filespec(struct diff_filespec *, int);
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extern void diff_free_filespec_data(struct diff_filespec *);
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extern void diff_free_filespec_blob(struct diff_filespec *);
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extern int diff_filespec_is_binary(struct diff_filespec *);
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struct diff_filepair {
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struct diff_filespec *one;
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struct diff_filespec *two;
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unsigned short int score;
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char status; /* M C R A D U etc. (see Documentation/diff-format.txt or DIFF_STATUS_* in diff.h) */
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unsigned broken_pair : 1;
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unsigned renamed_pair : 1;
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unsigned is_unmerged : 1;
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};
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#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
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#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
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#define DIFF_PAIR_BROKEN(p) \
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( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
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((p)->broken_pair != 0) )
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#define DIFF_PAIR_TYPE_CHANGED(p) \
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((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
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#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
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extern void diff_free_filepair(struct diff_filepair *);
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extern int diff_unmodified_pair(struct diff_filepair *);
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struct diff_queue_struct {
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struct diff_filepair **queue;
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int alloc;
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int nr;
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};
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#define DIFF_QUEUE_CLEAR(q) \
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do { \
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(q)->queue = NULL; \
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(q)->nr = (q)->alloc = 0; \
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} while (0)
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extern struct diff_queue_struct diff_queued_diff;
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extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
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struct diff_filespec *,
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struct diff_filespec *);
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extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
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extern void diffcore_break(int);
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extern void diffcore_rename(struct diff_options *);
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extern void diffcore_merge_broken(void);
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extern void diffcore_pickaxe(struct diff_options *);
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extern void diffcore_order(const char *orderfile);
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#define DIFF_DEBUG 0
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#if DIFF_DEBUG
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void diff_debug_filespec(struct diff_filespec *, int, const char *);
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void diff_debug_filepair(const struct diff_filepair *, int);
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void diff_debug_queue(const char *, struct diff_queue_struct *);
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#else
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#define diff_debug_filespec(a,b,c) do { /* nothing */ } while (0)
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#define diff_debug_filepair(a,b) do { /* nothing */ } while (0)
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#define diff_debug_queue(a,b) do { /* nothing */ } while (0)
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#endif
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extern int diffcore_count_changes(struct diff_filespec *src,
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struct diff_filespec *dst,
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void **src_count_p,
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void **dst_count_p,
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unsigned long delta_limit,
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unsigned long *src_copied,
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unsigned long *literal_added);
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#endif
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