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

#include "tree-walk.h"
#include "pathspec.h"
#include "object.h"

struct rev_info;
struct diff_options;
struct diff_queue_struct;
struct strbuf;
struct diff_filespec;
struct userdiff_driver;
struct oid_array;
struct commit;
struct combine_diff_path;

typedef int (*pathchange_fn_t)(struct diff_options *options,
                 struct combine_diff_path *path);

typedef void (*change_fn_t)(struct diff_options *options,
                 unsigned old_mode, unsigned new_mode,
                 const struct object_id *old_oid,
                 const struct object_id *new_oid,
                 int old_oid_valid, int new_oid_valid,
                 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 struct object_id *oid,
                    int oid_valid,
                    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_FLAGS_INIT { 0 }
struct diff_flags {
        unsigned RECURSIVE:1;
        unsigned TREE_IN_RECURSIVE:1;
        unsigned BINARY:1;
        unsigned TEXT:1;
        unsigned FULL_INDEX:1;
        unsigned SILENT_ON_REMOVE:1;
        unsigned FIND_COPIES_HARDER:1;
        unsigned FOLLOW_RENAMES:1;
        unsigned RENAME_EMPTY:1;
        unsigned HAS_CHANGES:1;
        unsigned QUICK:1;
        unsigned NO_INDEX:1;
        unsigned ALLOW_EXTERNAL:1;
        unsigned EXIT_WITH_STATUS:1;
        unsigned REVERSE_DIFF:1;
        unsigned CHECK_FAILED:1;
        unsigned RELATIVE_NAME:1;
        unsigned IGNORE_SUBMODULES:1;
        unsigned DIRSTAT_CUMULATIVE:1;
        unsigned DIRSTAT_BY_FILE:1;
        unsigned ALLOW_TEXTCONV:1;
        unsigned TEXTCONV_SET_VIA_CMDLINE:1;
        unsigned DIFF_FROM_CONTENTS:1;
        unsigned DIRTY_SUBMODULES:1;
        unsigned IGNORE_UNTRACKED_IN_SUBMODULES:1;
        unsigned IGNORE_DIRTY_SUBMODULES:1;
        unsigned OVERRIDE_SUBMODULE_CONFIG:1;
        unsigned DIRSTAT_BY_LINE:1;
        unsigned FUNCCONTEXT:1;
        unsigned PICKAXE_IGNORE_CASE:1;
        unsigned DEFAULT_FOLLOW_RENAMES:1;
};

static inline void diff_flags_or(struct diff_flags *a,
                                 const struct diff_flags *b)
{
        char *tmp_a = (char *)a;
        const char *tmp_b = (const char *)b;
        int i;

        for (i = 0; i < sizeof(struct diff_flags); i++)
                tmp_a[i] |= tmp_b[i];
}

#define DIFF_OPT_TST(opts, flag)        ((opts)->flags.flag)
#define DIFF_OPT_SET(opts, flag)        ((opts)->flags.flag = 1)
#define DIFF_OPT_CLR(opts, flag)        ((opts)->flags.flag = 0)

#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)

#define DIFF_WITH_ALG(opts, flag)   (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)

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

enum diff_submodule_format {
        DIFF_SUBMODULE_SHORT = 0,
        DIFF_SUBMODULE_LOG,
        DIFF_SUBMODULE_INLINE_DIFF
};

struct diff_options {
        const char *orderfile;
        const char *pickaxe;
        const char *single_follow;
        const char *a_prefix, *b_prefix;
        const char *line_prefix;
        size_t line_prefix_length;
        struct diff_flags flags;

        /* diff-filter bits */
        unsigned int filter;

        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;
        int ita_invisible_in_index;
/* white-space error highlighting */
#define WSEH_NEW (1<<12)
#define WSEH_CONTEXT (1<<13)
#define WSEH_OLD (1<<14)
        unsigned ws_error_highlight;
        const char *prefix;
        int prefix_length;
        const char *stat_sep;
        long xdl_opts;

        int stat_width;
        int stat_name_width;
        int stat_graph_width;
        int stat_count;
        const char *word_regex;
        enum diff_words_type word_diff;
        enum diff_submodule_format submodule_format;

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

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

        void (*set_default)(struct diff_options *);

        FILE *file;
        int close_file;

        struct pathspec pathspec;
        pathchange_fn_t pathchange;
        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;

        int diff_path_counter;

        struct emitted_diff_symbols *emitted_symbols;
        enum {
                COLOR_MOVED_NO = 0,
                COLOR_MOVED_PLAIN = 1,
                COLOR_MOVED_ZEBRA = 2,
                COLOR_MOVED_ZEBRA_DIM = 3,
        } color_moved;
        #define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
        #define COLOR_MOVED_MIN_ALNUM_COUNT 20
};

void diff_emit_submodule_del(struct diff_options *o, const char *line);
void diff_emit_submodule_add(struct diff_options *o, const char *line);
void diff_emit_submodule_untracked(struct diff_options *o, const char *path);
void diff_emit_submodule_modified(struct diff_options *o, const char *path);
void diff_emit_submodule_header(struct diff_options *o, const char *header);
void diff_emit_submodule_error(struct diff_options *o, const char *err);
void diff_emit_submodule_pipethrough(struct diff_options *o,
                                     const char *line, int len);

enum color_diff {
        DIFF_RESET = 0,
        DIFF_CONTEXT = 1,
        DIFF_METAINFO = 2,
        DIFF_FRAGINFO = 3,
        DIFF_FILE_OLD = 4,
        DIFF_FILE_NEW = 5,
        DIFF_COMMIT = 6,
        DIFF_WHITESPACE = 7,
        DIFF_FUNCINFO = 8,
        DIFF_FILE_OLD_MOVED = 9,
        DIFF_FILE_OLD_MOVED_ALT = 10,
        DIFF_FILE_OLD_MOVED_DIM = 11,
        DIFF_FILE_OLD_MOVED_ALT_DIM = 12,
        DIFF_FILE_NEW_MOVED = 13,
        DIFF_FILE_NEW_MOVED_ALT = 14,
        DIFF_FILE_NEW_MOVED_DIM = 15,
        DIFF_FILE_NEW_MOVED_ALT_DIM = 16
};
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)


const char *diff_line_prefix(struct diff_options *);


extern const char mime_boundary_leader[];

extern struct combine_diff_path *diff_tree_paths(
        struct combine_diff_path *p, const struct object_id *oid,
        const struct object_id **parents_oid, int nparent,
        struct strbuf *base, struct diff_options *opt);
extern int diff_tree_oid(const struct object_id *old_oid,
                         const struct object_id *new_oid,
                         const char *base, struct diff_options *opt);
extern int diff_root_tree_oid(const struct object_id *new_oid, const char *base,
                              struct diff_options *opt);

struct combine_diff_path {
        struct combine_diff_path *next;
        char *path;
        unsigned int mode;
        struct object_id oid;
        struct combine_diff_parent {
                char status;
                unsigned int mode;
                struct object_id oid;
        } parent[FLEX_ARRAY];
};
#define combine_diff_path_size(n, l) \
        st_add4(sizeof(struct combine_diff_path), (l), 1, \
                st_mult(sizeof(struct combine_diff_parent), (n)))

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

extern void diff_tree_combined(const struct object_id *oid, const struct oid_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 struct object_id *oid,
                           int oid_valid,
                           const char *fullpath, unsigned dirty_submodule);

extern void diff_change(struct diff_options *,
                        unsigned mode1, unsigned mode2,
                        const struct object_id *old_oid,
                        const struct object_id *new_oid,
                        int old_oid_valid, int new_oid_valid,
                        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 stuck 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_heuristic_config(const char *var, const char *value, void *cb);
extern void init_diff_ui_defaults(void);
extern int git_diff_ui_config(const char *var, const char *value, void *cb);
extern void diff_setup(struct diff_options *);
extern int diff_opt_parse(struct diff_options *, const char **, int, const char *);
extern void 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'

/*
 * This is different from find_unique_abbrev() in that
 * it stuffs the result with dots for alignment.
 */
extern const char *diff_aligned_abbrev(const struct object_id *sha1, 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 struct object_id *, struct diff_options *);
extern int diff_flush_patch_id(struct diff_options *, struct object_id *, int);

extern int diff_result_code(struct diff_options *, int);

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

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

/*
 * Fill the contents of the filespec "df", respecting any textconv defined by
 * its userdiff driver.  The "driver" parameter must come from a
 * previous call to get_textconv(), and therefore should either be NULL or have
 * textconv enabled.
 *
 * Note that the memory ownership of the resulting buffer depends on whether
 * the driver field is NULL. If it is, then the memory belongs to the filespec
 * struct. If it is non-NULL, then "outbuf" points to a newly allocated buffer
 * that should be freed by the caller.
 */
extern size_t fill_textconv(struct userdiff_driver *driver,
                            struct diff_filespec *df,
                            char **outbuf);

/*
 * Look up the userdiff driver for the given filespec, and return it if
 * and only if it has textconv enabled (otherwise return NULL). The result
 * can be passed to fill_textconv().
 */
extern struct userdiff_driver *get_textconv(struct diff_filespec *one);

/*
 * Prepare diff_filespec and convert it using diff textconv API
 * if the textconv driver exists.
 * Return 1 if the conversion succeeds, 0 otherwise.
 */
extern int textconv_object(const char *path, unsigned mode, const struct object_id *oid, int oid_valid, char **buf, unsigned long *buf_size);

extern int parse_rename_score(const char **cp_p);

extern long parse_algorithm_value(const char *value);

extern void print_stat_summary(FILE *fp, int files,
                               int insertions, int deletions);
extern void setup_diff_pager(struct diff_options *);

#endif /* DIFF_H */