/*
 * 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;
struct sha1_array;
struct commit;

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)
/* (1 <<  8) unused */
/* (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_DIRSTAT_BY_LINE     (1 << 28)
#define DIFF_OPT_FUNCCONTEXT         (1 << 29)

#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 use_color;
        int context;
        int interhunkcontext;
        int break_opt;
        int detect_rename;
        int irreversible_delete;
        int skip_stat_unmatch;
        int line_termination;
        int output_format;
        int pickaxe_opts;
        int rename_score;
        int rename_limit;
        int needed_rename_limit;
        int degraded_cc_to_c;
        int show_rename_progress;
        int dirstat_permille;
        int setup;
        int abbrev;
        const char *prefix;
        int prefix_length;
        const char *stat_sep;
        long xdl_opts;

        int stat_width;
        int stat_name_width;
        int stat_count;
        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;

        struct pathspec pathspec;
        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((o)->use_color, 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 struct sha1_array *parents, int dense, struct rev_info *rev);

extern void diff_tree_combined_merge(const struct commit *commit, int dense, struct rev_info *rev);

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

extern int diff_can_quit_early(struct diff_options *);

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 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);

#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*);
extern void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);

/* 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);

extern int print_stat_summary(FILE *fp, int files,
                              int insertions, int deletions);

#endif /* DIFF_H */