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/*
* Copyright (C) 2005 Junio C Hamano
*/
#ifndef DIFF_H
#define DIFF_H

#include "tree-walk.h"

struct rev_info;
struct diff_options;
struct diff_queue_struct;
struct strbuf;
struct diff_filespec;
struct userdiff_driver;

typedef void (*change_fn_t)(struct diff_options *options,
unsigned old_mode, unsigned new_mode,
const unsigned char *old_sha1,
const unsigned char *new_sha1,
const char *fullpath,
unsigned old_dirty_submodule, unsigned new_dirty_submodule);

typedef void (*add_remove_fn_t)(struct diff_options *options,
int addremove, unsigned mode,
const unsigned char *sha1,
const char *fullpath, unsigned dirty_submodule);

typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
struct diff_options *options, void *data);

typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);

#define DIFF_FORMAT_RAW 0x0001
#define DIFF_FORMAT_DIFFSTAT 0x0002
#define DIFF_FORMAT_NUMSTAT 0x0004
#define DIFF_FORMAT_SUMMARY 0x0008
#define DIFF_FORMAT_PATCH 0x0010
#define DIFF_FORMAT_SHORTSTAT 0x0020
#define DIFF_FORMAT_DIRSTAT 0x0040

/* These override all above */
#define DIFF_FORMAT_NAME 0x0100
#define DIFF_FORMAT_NAME_STATUS 0x0200
#define DIFF_FORMAT_CHECKDIFF 0x0400

/* Same as output_format = 0 but we know that -s flag was given
* and we should not give default value to output_format.
*/
#define DIFF_FORMAT_NO_OUTPUT 0x0800

#define DIFF_FORMAT_CALLBACK 0x1000

#define DIFF_OPT_RECURSIVE (1 << 0)
#define DIFF_OPT_TREE_IN_RECURSIVE (1 << 1)
#define DIFF_OPT_BINARY (1 << 2)
#define DIFF_OPT_TEXT (1 << 3)
#define DIFF_OPT_FULL_INDEX (1 << 4)
#define DIFF_OPT_SILENT_ON_REMOVE (1 << 5)
#define DIFF_OPT_FIND_COPIES_HARDER (1 << 6)
#define DIFF_OPT_FOLLOW_RENAMES (1 << 7)
#define DIFF_OPT_COLOR_DIFF (1 << 8)
/* (1 << 9) unused */
#define DIFF_OPT_HAS_CHANGES (1 << 10)
#define DIFF_OPT_QUICK (1 << 11)
#define DIFF_OPT_NO_INDEX (1 << 12)
#define DIFF_OPT_ALLOW_EXTERNAL (1 << 13)
#define DIFF_OPT_EXIT_WITH_STATUS (1 << 14)
#define DIFF_OPT_REVERSE_DIFF (1 << 15)
#define DIFF_OPT_CHECK_FAILED (1 << 16)
#define DIFF_OPT_RELATIVE_NAME (1 << 17)
#define DIFF_OPT_IGNORE_SUBMODULES (1 << 18)
#define DIFF_OPT_DIRSTAT_CUMULATIVE (1 << 19)
#define DIFF_OPT_DIRSTAT_BY_FILE (1 << 20)
#define DIFF_OPT_ALLOW_TEXTCONV (1 << 21)
#define DIFF_OPT_DIFF_FROM_CONTENTS (1 << 22)
#define DIFF_OPT_SUBMODULE_LOG (1 << 23)
#define DIFF_OPT_DIRTY_SUBMODULES (1 << 24)
#define DIFF_OPT_IGNORE_UNTRACKED_IN_SUBMODULES (1 << 25)
#define DIFF_OPT_IGNORE_DIRTY_SUBMODULES (1 << 26)
#define DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG (1 << 27)

#define DIFF_OPT_TST(opts, flag) ((opts)->flags & DIFF_OPT_##flag)
#define DIFF_OPT_SET(opts, flag) ((opts)->flags |= DIFF_OPT_##flag)
#define DIFF_OPT_CLR(opts, flag) ((opts)->flags &= ~DIFF_OPT_##flag)
#define DIFF_XDL_TST(opts, flag) ((opts)->xdl_opts & XDF_##flag)
#define DIFF_XDL_SET(opts, flag) ((opts)->xdl_opts |= XDF_##flag)
#define DIFF_XDL_CLR(opts, flag) ((opts)->xdl_opts &= ~XDF_##flag)

enum diff_words_type {
DIFF_WORDS_NONE = 0,
DIFF_WORDS_PORCELAIN,
DIFF_WORDS_PLAIN,
DIFF_WORDS_COLOR
};

struct diff_options {
const char *filter;
const char *orderfile;
const char *pickaxe;
const char *single_follow;
const char *a_prefix, *b_prefix;
unsigned flags;
int context;
int interhunkcontext;
int break_opt;
int detect_rename;
int skip_stat_unmatch;
int line_termination;
int output_format;
int pickaxe_opts;
int rename_score;
int rename_limit;
int warn_on_too_large_rename;
int dirstat_percent;
int setup;
int abbrev;
const char *prefix;
int prefix_length;
const char *stat_sep;
long xdl_opts;

int stat_width;
int stat_name_width;
const char *word_regex;
enum diff_words_type word_diff;

/* this is set by diffcore for DIFF_FORMAT_PATCH */
int found_changes;

/* to support internal diff recursion by --follow hack*/
int found_follow;

FILE *file;
int close_file;

int nr_paths;
const char **paths;
int *pathlens;
change_fn_t change;
add_remove_fn_t add_remove;
diff_format_fn_t format_callback;
void *format_callback_data;
diff_prefix_fn_t output_prefix;
void *output_prefix_data;
};

enum color_diff {
DIFF_RESET = 0,
DIFF_PLAIN = 1,
DIFF_METAINFO = 2,
DIFF_FRAGINFO = 3,
DIFF_FILE_OLD = 4,
DIFF_FILE_NEW = 5,
DIFF_COMMIT = 6,
DIFF_WHITESPACE = 7,
DIFF_FUNCINFO = 8
};
const char *diff_get_color(int diff_use_color, enum color_diff ix);
#define diff_get_color_opt(o, ix) \
diff_get_color(DIFF_OPT_TST((o), COLOR_DIFF), ix)


extern const char mime_boundary_leader[];

extern void diff_tree_setup_paths(const char **paths, struct diff_options *);
extern void diff_tree_release_paths(struct diff_options *);
extern int diff_tree(struct tree_desc *t1, struct tree_desc *t2,
const char *base, struct diff_options *opt);
extern int diff_tree_sha1(const unsigned char *old, const unsigned char *new,
const char *base, struct diff_options *opt);
extern int diff_root_tree_sha1(const unsigned char *new, const char *base,
                               struct diff_options *opt);

struct combine_diff_path {
struct combine_diff_path *next;
int len;
char *path;
unsigned int mode;
unsigned char sha1[20];
struct combine_diff_parent {
char status;
unsigned int mode;
unsigned char sha1[20];
} parent[FLEX_ARRAY];
};
#define combine_diff_path_size(n, l) \
(sizeof(struct combine_diff_path) + \
sizeof(struct combine_diff_parent) * (n) + (l) + 1)

extern void show_combined_diff(struct combine_diff_path *elem, int num_parent,
int dense, struct rev_info *);

extern void diff_tree_combined(const unsigned char *sha1, const unsigned char parent[][20], int num_parent, int dense, struct rev_info *rev);

extern void diff_tree_combined_merge(const unsigned char *sha1, int, struct rev_info *);

void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);

extern void diff_addremove(struct diff_options *,
int addremove,
unsigned mode,
const unsigned char *sha1,
const char *fullpath, unsigned dirty_submodule);

extern void diff_change(struct diff_options *,
unsigned mode1, unsigned mode2,
const unsigned char *sha1,
const unsigned char *sha2,
const char *fullpath,
unsigned dirty_submodule1, unsigned dirty_submodule2);

extern void diff_unmerge(struct diff_options *,
const char *path,
unsigned mode,
const unsigned char *sha1);

#define DIFF_SETUP_REVERSE 1
#define DIFF_SETUP_USE_CACHE 2
#define DIFF_SETUP_USE_SIZE_CACHE 4

/*
* Poor man's alternative to parse-option, to allow both sticked form
* (--option=value) and separate form (--option value).
*/
extern int parse_long_opt(const char *opt, const char **argv,
const char **optarg);

extern int git_diff_basic_config(const char *var, const char *value, void *cb);
extern int git_diff_ui_config(const char *var, const char *value, void *cb);
extern int diff_use_color_default;
extern void diff_setup(struct diff_options *);
extern int diff_opt_parse(struct diff_options *, const char **, int);
extern int diff_setup_done(struct diff_options *);

#define DIFF_DETECT_RENAME 1
#define DIFF_DETECT_COPY 2

#define DIFF_PICKAXE_ALL 1
#define DIFF_PICKAXE_REGEX 2

#define DIFF_PICKAXE_KIND_S 4 /* traditional plumbing counter */
#define DIFF_PICKAXE_KIND_G 8 /* grep in the patch */

extern void diffcore_std(struct diff_options *);
extern void diffcore_fix_diff_index(struct diff_options *);

#define COMMON_DIFF_OPTIONS_HELP \
"\ncommon diff options:\n" \
" -z output diff-raw with lines terminated with NUL.\n" \
" -p output patch format.\n" \
" -u synonym for -p.\n" \
" --patch-with-raw\n" \
" output both a patch and the diff-raw format.\n" \
" --stat show diffstat instead of patch.\n" \
" --numstat show numeric diffstat instead of patch.\n" \
" --patch-with-stat\n" \
" output a patch and prepend its diffstat.\n" \
" --name-only show only names of changed files.\n" \
" --name-status show names and status of changed files.\n" \
" --full-index show full object name on index lines.\n" \
" --abbrev=<n> abbreviate object names in diff-tree header and diff-raw.\n" \
" -R swap input file pairs.\n" \
" -B detect complete rewrites.\n" \
" -M detect renames.\n" \
" -C detect copies.\n" \
" --find-copies-harder\n" \
" try unchanged files as candidate for copy detection.\n" \
" -l<n> limit rename attempts up to <n> paths.\n" \
" -O<file> reorder diffs according to the <file>.\n" \
" -S<string> find filepair whose only one side contains the string.\n" \
" --pickaxe-all\n" \
" show all files diff when -S is used and hit is found.\n" \
" -a --text treat all files as text.\n"

extern int diff_queue_is_empty(void);
extern void diff_flush(struct diff_options*);

/* diff-raw status letters */
#define DIFF_STATUS_ADDED 'A'
#define DIFF_STATUS_COPIED 'C'
#define DIFF_STATUS_DELETED 'D'
#define DIFF_STATUS_MODIFIED 'M'
#define DIFF_STATUS_RENAMED 'R'
#define DIFF_STATUS_TYPE_CHANGED 'T'
#define DIFF_STATUS_UNKNOWN 'X'
#define DIFF_STATUS_UNMERGED 'U'

/* these are not diff-raw status letters proper, but used by
* diffcore-filter insn to specify additional restrictions.
*/
#define DIFF_STATUS_FILTER_AON '*'
#define DIFF_STATUS_FILTER_BROKEN 'B'

extern const char *diff_unique_abbrev(const unsigned char *, int);

/* do not report anything on removed paths */
#define DIFF_SILENT_ON_REMOVED 01
/* report racily-clean paths as modified */
#define DIFF_RACY_IS_MODIFIED 02
extern int run_diff_files(struct rev_info *revs, unsigned int option);
extern int run_diff_index(struct rev_info *revs, int cached);

extern int do_diff_cache(const unsigned char *, struct diff_options *);
extern int diff_flush_patch_id(struct diff_options *, unsigned char *);

extern int diff_result_code(struct diff_options *, int);

extern void diff_no_index(struct rev_info *, int, const char **, int, const char *);

extern int index_differs_from(const char *def, int diff_flags);

extern size_t fill_textconv(struct userdiff_driver *driver,
struct diff_filespec *df,
char **outbuf);

extern struct userdiff_driver *get_textconv(struct diff_filespec *one);

extern int parse_rename_score(const char **cp_p);

#endif /* DIFF_H */
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