/*
 * 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 sha1_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 unsigned char *old_sha1,
		 const unsigned char *new_sha1,
		 int old_sha1_valid, int new_sha1_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 unsigned char *sha1,
		    int sha1_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_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_RENAME_EMPTY        (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_DIRSTAT_BY_LINE     (1 << 28)
#define DIFF_OPT_FUNCCONTEXT         (1 << 29)
#define DIFF_OPT_PICKAXE_IGNORE_CASE (1 << 30)
#define DIFF_OPT_DEFAULT_FOLLOW_RENAMES (1U << 31)

#define DIFF_OPT_TST(opts, flag)    ((opts)->flags & DIFF_OPT_##flag)
#define DIFF_OPT_TOUCHED(opts, flag)    ((opts)->touched_flags & DIFF_OPT_##flag)
#define DIFF_OPT_SET(opts, flag)    (((opts)->flags |= DIFF_OPT_##flag),((opts)->touched_flags |= DIFF_OPT_##flag))
#define DIFF_OPT_CLR(opts, flag)    (((opts)->flags &= ~DIFF_OPT_##flag),((opts)->touched_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)

#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
};

struct diff_options {
	const char *orderfile;
	const char *pickaxe;
	const char *single_follow;
	const char *a_prefix, *b_prefix;
	unsigned flags;
	unsigned touched_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;
/* white-space error highlighting */
#define WSEH_NEW 1
#define WSEH_CONTEXT 2
#define WSEH_OLD 4
	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;

	/* 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;
	int output_prefix_length;
	void *output_prefix_data;

	int diff_path_counter;
};

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
};
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 unsigned char *sha1,
	const unsigned char **parent_sha1, int nparent,
	struct strbuf *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;
	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 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,
			   int sha1_valid,
			   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,
			int sha1_valid,
			int sha2_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 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'

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 *, 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, int diff_flags);

/*
 * 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);

extern int parse_rename_score(const char **cp_p);

extern long parse_algorithm_value(const char *value);

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

#endif /* DIFF_H */