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-rw-r--r--third_party/git/diff.h651
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diff --git a/third_party/git/diff.h b/third_party/git/diff.h
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-/*
- * Copyright (C) 2005 Junio C Hamano
- */
-#ifndef DIFF_H
-#define DIFF_H
-
-#include "tree-walk.h"
-#include "pathspec.h"
-#include "object.h"
-#include "oidset.h"
-
-/**
- * The diff API is for programs that compare two sets of files (e.g. two trees,
- * one tree and the index) and present the found difference in various ways.
- * The calling program is responsible for feeding the API pairs of files, one
- * from the "old" set and the corresponding one from "new" set, that are
- * different.
- * The library called through this API is called diffcore, and is responsible
- * for two things.
- *
- * - finding total rewrites (`-B`), renames (`-M`) and copies (`-C`), and
- * changes that touch a string (`-S`), as specified by the caller.
- *
- * - outputting the differences in various formats, as specified by the caller.
- *
- * Calling sequence
- * ----------------
- *
- * - Prepare `struct diff_options` to record the set of diff options, and then
- * call `repo_diff_setup()` to initialize this structure.  This sets up the
- * vanilla default.
- *
- * - Fill in the options structure to specify desired output format, rename
- * detection, etc.  `diff_opt_parse()` can be used to parse options given
- * from the command line in a way consistent with existing git-diff family
- * of programs.
- *
- * - Call `diff_setup_done()`; this inspects the options set up so far for
- * internal consistency and make necessary tweaking to it (e.g. if textual
- * patch output was asked, recursive behaviour is turned on); the callback
- * set_default in diff_options can be used to tweak this more.
- *
- * - As you find different pairs of files, call `diff_change()` to feed
- * modified files, `diff_addremove()` to feed created or deleted files, or
- * `diff_unmerge()` to feed a file whose state is 'unmerged' to the API.
- * These are thin wrappers to a lower-level `diff_queue()` function that is
- * flexible enough to record any of these kinds of changes.
- *
- * - Once you finish feeding the pairs of files, call `diffcore_std()`.
- * This will tell the diffcore library to go ahead and do its work.
- *
- * - Calling `diff_flush()` will produce the output.
- */
-
-struct combine_diff_path;
-struct commit;
-struct diff_filespec;
-struct diff_options;
-struct diff_queue_struct;
-struct oid_array;
-struct option;
-struct repository;
-struct rev_info;
-struct strbuf;
-struct userdiff_driver;
-
-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 {
-
-	/**
-	 * Tells if tree traversal done by tree-diff should recursively descend
-	 * into a tree object pair that are different in preimage and postimage set.
-	 */
-	unsigned recursive;
-	unsigned tree_in_recursive;
-
-	/* Affects the way how a file that is seemingly binary is treated. */
-	unsigned binary;
-	unsigned text;
-
-	/**
-	 * Tells the patch output format not to use abbreviated object names on the
-	 * "index" lines.
-	 */
-	unsigned full_index;
-
-	/* Affects if diff-files shows removed files. */
-	unsigned silent_on_remove;
-
-	/**
-	 * Tells the diffcore library that the caller is feeding unchanged
-	 * filepairs to allow copies from unmodified files be detected.
-	 */
-	unsigned find_copies_harder;
-
-	unsigned follow_renames;
-	unsigned rename_empty;
-
-	/* Internal; used for optimization to see if there is any change. */
-	unsigned has_changes;
-
-	unsigned quick;
-
-	/**
-	 * Tells diff-files that the input is not tracked files but files in random
-	 * locations on the filesystem.
-	 */
-	unsigned no_index;
-
-	/**
-	 * Tells output routine that it is Ok to call user specified patch output
-	 * routine.  Plumbing disables this to ensure stable output.
-	 */
-	unsigned allow_external;
-
-	/**
-	 * For communication between the calling program and the options parser;
-	 * tell the calling program to signal the presence of difference using
-	 * program exit code.
-	 */
-	unsigned exit_with_status;
-
-	/**
-	 * Tells the library that the calling program is feeding the filepairs
-	 * reversed; `one` is two, and `two` is one.
-	 */
-	unsigned reverse_diff;
-
-	unsigned check_failed;
-	unsigned relative_name;
-	unsigned ignore_submodules;
-	unsigned dirstat_cumulative;
-	unsigned dirstat_by_file;
-	unsigned allow_textconv;
-	unsigned textconv_set_via_cmdline;
-	unsigned diff_from_contents;
-	unsigned dirty_submodules;
-	unsigned ignore_untracked_in_submodules;
-	unsigned ignore_dirty_submodules;
-	unsigned override_submodule_config;
-	unsigned dirstat_by_line;
-	unsigned funccontext;
-	unsigned default_follow_renames;
-	unsigned stat_with_summary;
-	unsigned suppress_diff_headers;
-	unsigned dual_color_diffed_diffs;
-	unsigned suppress_hunk_header_line_count;
-};
-
-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_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
-};
-
-/**
- * the set of options the calling program wants to affect the operation of
- * diffcore library with.
- */
-struct diff_options {
-	const char *orderfile;
-
-	/**
-	 * A constant string (can and typically does contain newlines to look for
-	 * a block of text, not just a single line) to filter out the filepairs
-	 * that do not change the number of strings contained in its preimage and
-	 * postimage of the diff_queue.
-	 */
-	const char *pickaxe;
-
-	const char *single_follow;
-	const char *a_prefix, *b_prefix;
-	const char *line_prefix;
-	size_t line_prefix_length;
-
-	/**
-	 * collection of boolean options that affects the operation, but some do
-	 * not have anything to do with the diffcore library.
-	 */
-	struct diff_flags flags;
-
-	/* diff-filter bits */
-	unsigned int filter;
-
-	int use_color;
-
-	/* Number of context lines to generate in patch output. */
-	int context;
-
-	int interhunkcontext;
-
-	/* Affects the way detection logic for complete rewrites, renames and
-	 * copies.
-	 */
-	int break_opt;
-	int detect_rename;
-
-	int irreversible_delete;
-	int skip_stat_unmatch;
-	int line_termination;
-
-	/* The output format used when `diff_flush()` is run. */
-	int output_format;
-
-	unsigned pickaxe_opts;
-
-	/* Affects the way detection logic for complete rewrites, renames and
-	 * copies.
-	 */
-	int rename_score;
-	int rename_limit;
-
-	int needed_rename_limit;
-	int degraded_cc_to_c;
-	int show_rename_progress;
-	int dirstat_permille;
-	int setup;
-
-	/* Number of hexdigits to abbreviate raw format output to. */
-	int abbrev;
-
-	/* If non-zero, then stop computing after this many changes. */
-	int max_changes;
-
-	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;
-	int xdl_opts;
-
-	/* see Documentation/diff-options.txt */
-	char **anchors;
-	size_t anchors_nr, anchors_alloc;
-
-	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;
-
-	struct oidset *objfind;
-
-	/* this is set by diffcore for DIFF_FORMAT_PATCH */
-	int found_changes;
-
-	/* to support internal diff recursion by --follow hack*/
-	int found_follow;
-
-	/* Callback which allows tweaking the options in diff_setup_done(). */
-	void (*set_default)(struct diff_options *);
-
-	FILE *file;
-	int close_file;
-
-#define OUTPUT_INDICATOR_NEW 0
-#define OUTPUT_INDICATOR_OLD 1
-#define OUTPUT_INDICATOR_CONTEXT 2
-	char output_indicators[3];
-
-	struct pathspec pathspec;
-	pathchange_fn_t pathchange;
-	change_fn_t change;
-	add_remove_fn_t add_remove;
-	void *change_fn_data;
-	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_BLOCKS = 2,
-		COLOR_MOVED_ZEBRA = 3,
-		COLOR_MOVED_ZEBRA_DIM = 4,
-	} color_moved;
-	#define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
-	#define COLOR_MOVED_MIN_ALNUM_COUNT 20
-
-	/* XDF_WHITESPACE_FLAGS regarding block detection are set at 2, 3, 4 */
-	#define COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE (1<<5)
-	#define COLOR_MOVED_WS_ERROR (1<<0)
-	unsigned color_moved_ws_handling;
-
-	struct repository *repo;
-	struct option *parseopts;
-};
-
-unsigned diff_filter_bit(char status);
-
-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);
-
-struct diffstat_t {
-	int nr;
-	int alloc;
-	struct diffstat_file {
-		char *from_name;
-		char *name;
-		char *print_name;
-		const char *comments;
-		unsigned is_unmerged:1;
-		unsigned is_binary:1;
-		unsigned is_renamed:1;
-		unsigned is_interesting:1;
-		uintmax_t added, deleted;
-	} **files;
-};
-
-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,
-	DIFF_CONTEXT_DIM = 17,
-	DIFF_FILE_OLD_DIM = 18,
-	DIFF_FILE_NEW_DIM = 19,
-	DIFF_CONTEXT_BOLD = 20,
-	DIFF_FILE_OLD_BOLD = 21,
-	DIFF_FILE_NEW_BOLD = 22,
-};
-
-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[];
-
-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);
-void diff_tree_oid(const struct object_id *old_oid,
-		   const struct object_id *new_oid,
-		   const char *base, struct diff_options *opt);
-void 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;
-		struct strbuf path;
-	} 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)))
-
-void show_combined_diff(struct combine_diff_path *elem, int num_parent,
-			struct rev_info *);
-
-void diff_tree_combined(const struct object_id *oid, const struct oid_array *parents, struct rev_info *rev);
-
-void diff_tree_combined_merge(const struct commit *commit, struct rev_info *rev);
-
-void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
-
-int diff_can_quit_early(struct diff_options *);
-
-void diff_addremove(struct diff_options *,
-		    int addremove,
-		    unsigned mode,
-		    const struct object_id *oid,
-		    int oid_valid,
-		    const char *fullpath, unsigned dirty_submodule);
-
-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);
-
-struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
-
-void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat,
-		      struct diff_queue_struct *q);
-void free_diffstat_info(struct diffstat_t *diffstat);
-
-#define DIFF_SETUP_REVERSE      	1
-#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).
- */
-int parse_long_opt(const char *opt, const char **argv,
-		   const char **optarg);
-
-int git_diff_basic_config(const char *var, const char *value, void *cb);
-int git_diff_heuristic_config(const char *var, const char *value, void *cb);
-void init_diff_ui_defaults(void);
-int git_diff_ui_config(const char *var, const char *value, void *cb);
-#ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
-#define diff_setup(diffopts) repo_diff_setup(the_repository, diffopts)
-#endif
-void repo_diff_setup(struct repository *, struct diff_options *);
-int diff_opt_parse(struct diff_options *, const char **, int, const char *);
-void diff_setup_done(struct diff_options *);
-int git_config_rename(const char *var, const char *value);
-
-#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 */
-#define DIFF_PICKAXE_KIND_OBJFIND	16 /* specific object IDs */
-
-#define DIFF_PICKAXE_KINDS_MASK (DIFF_PICKAXE_KIND_S | \
-				 DIFF_PICKAXE_KIND_G | \
-				 DIFF_PICKAXE_KIND_OBJFIND)
-
-#define DIFF_PICKAXE_IGNORE_CASE	32
-
-void diffcore_std(struct diff_options *);
-void diffcore_fix_diff_index(void);
-
-#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"
-
-int diff_queue_is_empty(void);
-void diff_flush(struct diff_options*);
-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.
- */
-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
-int run_diff_files(struct rev_info *revs, unsigned int option);
-int run_diff_index(struct rev_info *revs, int cached);
-
-int do_diff_cache(const struct object_id *, struct diff_options *);
-int diff_flush_patch_id(struct diff_options *, struct object_id *, int, int);
-void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx);
-
-int diff_result_code(struct diff_options *, int);
-
-int diff_no_index(struct rev_info *,
-		  int implicit_no_index, int, const char **);
-
-int index_differs_from(struct repository *r, const char *def,
-		       const struct diff_flags *flags,
-		       int ita_invisible_in_index);
-
-/*
- * Emit an interdiff of two object ID's to 'diff_options.file' optionally
- * indented by 'indent' spaces.
- */
-void show_interdiff(const struct object_id *, const struct object_id *,
-		    int indent, struct diff_options *);
-
-/*
- * 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.
- */
-size_t fill_textconv(struct repository *r,
-		     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().
- */
-struct userdiff_driver *get_textconv(struct repository *r,
-				     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.
- */
-int textconv_object(struct repository *repo,
-		    const char *path,
-		    unsigned mode,
-		    const struct object_id *oid, int oid_valid,
-		    char **buf, unsigned long *buf_size);
-
-int parse_rename_score(const char **cp_p);
-
-long parse_algorithm_value(const char *value);
-
-void print_stat_summary(FILE *fp, int files,
-			int insertions, int deletions);
-void setup_diff_pager(struct diff_options *);
-
-#endif /* DIFF_H */