Adding upstream version 1:2.39.2.upstream/1%2.39.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 699 insertions, 0 deletions

diff --git a/diff.h b/diff.h
new file mode 100644
index 0000000..fd33cae
--- /dev/null
+++ b/diff.h
@@ -0,0 +1,699 @@
+/*
+ * 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, it will call
+ *   `diff_free()` to free any resources, e.g. those allocated in
+ *   `diff_opt_parse()`.
+ *
+ * - Set `.no_free = 1` before calling `diff_flush()` to defer the
+ *   freeing of allocated memory in diff_options. This is useful when
+ *   `diff_flush()` is being called in a loop, rather than as a
+ *   one-off. When setting `.no_free = 1` you must ensure that
+ *   `diff_free()` is called at the end, either by flipping the flag
+ *   before the last `diff_flush()` call, or by flipping it before
+ *   calling `diff_free()` yourself.
+ */
+
+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_submodule_set;
+	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;
+
+	/*
+	 * "--rotate-to=<file>" would start showing at <file> and when
+	 * the output reaches the end, wrap around by default.
+	 * Setting skip_instead_of_rotate to true stops the output at the
+	 * end, effectively discarding the earlier part of the output
+	 * before <file>'s diff (this is used to implement the
+	 * "--skip-to=<file>" option).
+	 *
+	 * When rotate_to_strict is set, it is an error if there is no
+	 * <file> in the diff.  Otherwise, the output starts at the
+	 * path that is the same as, or first path that sorts after,
+	 * <file>.  Because it is unreasonable to require the exact
+	 * match for "git log -p --rotate-to=<file>" (i.e. not all
+	 * commit would touch that single <file>), "git log" sets it
+	 * to false.  "git diff" sets it to true to detect an error
+	 * in the command line option.
+	 */
+	const char *rotate_to;
+	int skip_instead_of_rotate;
+	int rotate_to_strict;
+
+	/**
+	 * 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;
+	unsigned pickaxe_opts;
+
+	/* -I<regex> */
+	regex_t **ignore_regex;
+	size_t ignore_regex_nr, ignore_regex_alloc;
+
+	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, filter_not;
+
+	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;
+
+	/* 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;
+	struct strmap *additional_path_headers;
+
+	int no_free;
+};
+
+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_KINDS_G_REGEX_MASK (DIFF_PICKAXE_KIND_G | \
+					 DIFF_PICKAXE_REGEX)
+#define DIFF_PICKAXE_KINDS_ALL_OBJFIND_MASK (DIFF_PICKAXE_ALL | \
+					     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(struct diff_options *o);
+void diff_flush(struct diff_options*);
+void diff_free(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);
+
+void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb);
+
+/* 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);
+
+#define DIFF_INDEX_CACHED 01
+#define DIFF_INDEX_MERGE_BASE 02
+int run_diff_index(struct rev_info *revs, unsigned int option);
+
+int do_diff_cache(const struct object_id *, struct diff_options *);
+int diff_flush_patch_id(struct diff_options *, struct object_id *, 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 */