diffcore.h 4.78 KB
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/*
 * Copyright (C) 2005 Junio C Hamano
 */
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#ifndef DIFFCORE_H
#define DIFFCORE_H
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#include "cache.h"

struct diff_options;
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struct repository;
struct userdiff_driver;
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/* This header file is internal between diff.c and its diff transformers
 * (e.g. diffcore-rename, diffcore-pickaxe).  Never include this header
 * in anything else.
 */
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/* We internally use unsigned short as the score value,
 * and rely on an int capable to hold 32-bits.  -B can take
 * -Bmerge_score/break_score format and the two scores are
 * passed around in one int (high 16-bit for merge and low 16-bit
 * for break).
 */
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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 diff_filespec {
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	struct object_id oid;
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	char *path;
	void *data;
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	void *cnt_data;
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	unsigned long size;
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	int count;               /* Reference count */
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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 oid_valid : 1;  /* if true, use oid and trust mode;
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				  * if false, use the name and read from
				  * the filesystem.
				  */
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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 */
	unsigned should_munmap : 1; /* data should be munmap()'ed */
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	unsigned dirty_submodule : 2;  /* For submodules: its work tree is dirty */
#define DIRTY_SUBMODULE_UNTRACKED 1
#define DIRTY_SUBMODULE_MODIFIED  2
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	unsigned is_stdin : 1;
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	unsigned has_more_entries : 1; /* only appear in combined diff */
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	/* data should be considered "binary"; -1 means "don't know yet" */
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	signed int is_binary : 2;
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	struct userdiff_driver *driver;
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};

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struct diff_filespec *alloc_filespec(const char *);
void free_filespec(struct diff_filespec *);
void fill_filespec(struct diff_filespec *, const struct object_id *,
		   int, unsigned short);
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#define CHECK_SIZE_ONLY 1
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#define CHECK_BINARY    2
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int diff_populate_filespec(struct repository *, struct diff_filespec *, unsigned int);
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void diff_free_filespec_data(struct diff_filespec *);
void diff_free_filespec_blob(struct diff_filespec *);
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int diff_filespec_is_binary(struct repository *, struct diff_filespec *);
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struct diff_filepair {
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	struct diff_filespec *one;
	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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	unsigned done_skip_stat_unmatch : 1;
	unsigned skip_stat_unmatch_result : 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) \
	( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
	  ((p)->broken_pair != 0) )

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#define DIFF_PAIR_TYPE_CHANGED(p) \
	((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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void diff_free_filepair(struct diff_filepair *);
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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;
	int nr;
};
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#define DIFF_QUEUE_CLEAR(q) \
	do { \
		(q)->queue = NULL; \
		(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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struct diff_filepair *diff_queue(struct diff_queue_struct *,
				 struct diff_filespec *,
				 struct diff_filespec *);
void diff_q(struct diff_queue_struct *, struct diff_filepair *);
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void diffcore_break(struct repository *, int);
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void diffcore_rename(struct diff_options *);
void diffcore_merge_broken(void);
void diffcore_pickaxe(struct diff_options *);
void diffcore_order(const char *orderfile);
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/* low-level interface to diffcore_order */
struct obj_order {
	void *obj;	/* setup by caller */

	/* setup/used by order_objects() */
	int orig_order;
	int order;
};

typedef const char *(*obj_path_fn_t)(void *obj);

void order_objects(const char *orderfile, obj_path_fn_t obj_path,
		   struct obj_order *objs, int nr);

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#define DIFF_DEBUG 0
#if DIFF_DEBUG
void diff_debug_filespec(struct diff_filespec *, int, const char *);
void diff_debug_filepair(const struct diff_filepair *, int);
void diff_debug_queue(const char *, struct diff_queue_struct *);
#else
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#define diff_debug_filespec(a,b,c) do { /* nothing */ } while (0)
#define diff_debug_filepair(a,b) do { /* nothing */ } while (0)
#define diff_debug_queue(a,b) do { /* nothing */ } while (0)
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#endif

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int diffcore_count_changes(struct repository *r,
			   struct diff_filespec *src,
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			   struct diff_filespec *dst,
			   void **src_count_p,
			   void **dst_count_p,
			   unsigned long *src_copied,
			   unsigned long *literal_added);
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#endif