The eighth batch
[git.git] / diff.h
blobc8f3faea8aa9ad9d627ec61326d89cd8f2ea27c5
1 /*
2 * Copyright (C) 2005 Junio C Hamano
3 */
4 #ifndef DIFF_H
5 #define DIFF_H
7 #include "tree-walk.h"
8 #include "pathspec.h"
9 #include "object.h"
10 #include "oidset.h"
12 /**
13 * The diff API is for programs that compare two sets of files (e.g. two trees,
14 * one tree and the index) and present the found difference in various ways.
15 * The calling program is responsible for feeding the API pairs of files, one
16 * from the "old" set and the corresponding one from "new" set, that are
17 * different.
18 * The library called through this API is called diffcore, and is responsible
19 * for two things.
21 * - finding total rewrites (`-B`), renames (`-M`) and copies (`-C`), and
22 * changes that touch a string (`-S`), as specified by the caller.
24 * - outputting the differences in various formats, as specified by the caller.
26 * Calling sequence
27 * ----------------
29 * - Prepare `struct diff_options` to record the set of diff options, and then
30 * call `repo_diff_setup()` to initialize this structure. This sets up the
31 * vanilla default.
33 * - Fill in the options structure to specify desired output format, rename
34 * detection, etc. `diff_opt_parse()` can be used to parse options given
35 * from the command line in a way consistent with existing git-diff family
36 * of programs.
38 * - Call `diff_setup_done()`; this inspects the options set up so far for
39 * internal consistency and make necessary tweaking to it (e.g. if textual
40 * patch output was asked, recursive behaviour is turned on); the callback
41 * set_default in diff_options can be used to tweak this more.
43 * - As you find different pairs of files, call `diff_change()` to feed
44 * modified files, `diff_addremove()` to feed created or deleted files, or
45 * `diff_unmerge()` to feed a file whose state is 'unmerged' to the API.
46 * These are thin wrappers to a lower-level `diff_queue()` function that is
47 * flexible enough to record any of these kinds of changes.
49 * - Once you finish feeding the pairs of files, call `diffcore_std()`.
50 * This will tell the diffcore library to go ahead and do its work.
52 * - Calling `diff_flush()` will produce the output, it will call
53 * `diff_free()` to free any resources, e.g. those allocated in
54 * `diff_opt_parse()`.
56 * - Set `.no_free = 1` before calling `diff_flush()` to defer the
57 * freeing of allocated memory in diff_options. This is useful when
58 * `diff_flush()` is being called in a loop, rather than as a
59 * one-off. When setting `.no_free = 1` you must ensure that
60 * `diff_free()` is called at the end, either by flipping the flag
61 * before the last `diff_flush()` call, or by flipping it before
62 * calling `diff_free()` yourself.
65 struct combine_diff_path;
66 struct commit;
67 struct diff_filespec;
68 struct diff_options;
69 struct diff_queue_struct;
70 struct oid_array;
71 struct option;
72 struct repository;
73 struct rev_info;
74 struct strbuf;
75 struct userdiff_driver;
77 typedef int (*pathchange_fn_t)(struct diff_options *options,
78 struct combine_diff_path *path);
80 typedef void (*change_fn_t)(struct diff_options *options,
81 unsigned old_mode, unsigned new_mode,
82 const struct object_id *old_oid,
83 const struct object_id *new_oid,
84 int old_oid_valid, int new_oid_valid,
85 const char *fullpath,
86 unsigned old_dirty_submodule, unsigned new_dirty_submodule);
88 typedef void (*add_remove_fn_t)(struct diff_options *options,
89 int addremove, unsigned mode,
90 const struct object_id *oid,
91 int oid_valid,
92 const char *fullpath, unsigned dirty_submodule);
94 typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
95 struct diff_options *options, void *data);
97 typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);
99 #define DIFF_FORMAT_RAW 0x0001
100 #define DIFF_FORMAT_DIFFSTAT 0x0002
101 #define DIFF_FORMAT_NUMSTAT 0x0004
102 #define DIFF_FORMAT_SUMMARY 0x0008
103 #define DIFF_FORMAT_PATCH 0x0010
104 #define DIFF_FORMAT_SHORTSTAT 0x0020
105 #define DIFF_FORMAT_DIRSTAT 0x0040
107 /* These override all above */
108 #define DIFF_FORMAT_NAME 0x0100
109 #define DIFF_FORMAT_NAME_STATUS 0x0200
110 #define DIFF_FORMAT_CHECKDIFF 0x0400
112 /* Same as output_format = 0 but we know that -s flag was given
113 * and we should not give default value to output_format.
115 #define DIFF_FORMAT_NO_OUTPUT 0x0800
117 #define DIFF_FORMAT_CALLBACK 0x1000
119 #define DIFF_FLAGS_INIT { 0 }
120 struct diff_flags {
123 * Tells if tree traversal done by tree-diff should recursively descend
124 * into a tree object pair that are different in preimage and postimage set.
126 unsigned recursive;
127 unsigned tree_in_recursive;
129 /* Affects the way how a file that is seemingly binary is treated. */
130 unsigned binary;
131 unsigned text;
134 * Tells the patch output format not to use abbreviated object names on the
135 * "index" lines.
137 unsigned full_index;
139 /* Affects if diff-files shows removed files. */
140 unsigned silent_on_remove;
143 * Tells the diffcore library that the caller is feeding unchanged
144 * filepairs to allow copies from unmodified files be detected.
146 unsigned find_copies_harder;
148 unsigned follow_renames;
149 unsigned rename_empty;
151 /* Internal; used for optimization to see if there is any change. */
152 unsigned has_changes;
154 unsigned quick;
157 * Tells diff-files that the input is not tracked files but files in random
158 * locations on the filesystem.
160 unsigned no_index;
163 * Tells output routine that it is Ok to call user specified patch output
164 * routine. Plumbing disables this to ensure stable output.
166 unsigned allow_external;
169 * For communication between the calling program and the options parser;
170 * tell the calling program to signal the presence of difference using
171 * program exit code.
173 unsigned exit_with_status;
176 * Tells the library that the calling program is feeding the filepairs
177 * reversed; `one` is two, and `two` is one.
179 unsigned reverse_diff;
181 unsigned check_failed;
182 unsigned relative_name;
183 unsigned ignore_submodules;
184 unsigned dirstat_cumulative;
185 unsigned dirstat_by_file;
186 unsigned allow_textconv;
187 unsigned textconv_set_via_cmdline;
188 unsigned diff_from_contents;
189 unsigned dirty_submodules;
190 unsigned ignore_untracked_in_submodules;
191 unsigned ignore_submodule_set;
192 unsigned ignore_dirty_submodules;
193 unsigned override_submodule_config;
194 unsigned dirstat_by_line;
195 unsigned funccontext;
196 unsigned default_follow_renames;
197 unsigned stat_with_summary;
198 unsigned suppress_diff_headers;
199 unsigned dual_color_diffed_diffs;
200 unsigned suppress_hunk_header_line_count;
203 static inline void diff_flags_or(struct diff_flags *a,
204 const struct diff_flags *b)
206 char *tmp_a = (char *)a;
207 const char *tmp_b = (const char *)b;
208 int i;
210 for (i = 0; i < sizeof(struct diff_flags); i++)
211 tmp_a[i] |= tmp_b[i];
214 #define DIFF_XDL_TST(opts, flag) ((opts)->xdl_opts & XDF_##flag)
215 #define DIFF_XDL_SET(opts, flag) ((opts)->xdl_opts |= XDF_##flag)
216 #define DIFF_XDL_CLR(opts, flag) ((opts)->xdl_opts &= ~XDF_##flag)
218 #define DIFF_WITH_ALG(opts, flag) (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)
220 enum diff_words_type {
221 DIFF_WORDS_NONE = 0,
222 DIFF_WORDS_PORCELAIN,
223 DIFF_WORDS_PLAIN,
224 DIFF_WORDS_COLOR
227 enum diff_submodule_format {
228 DIFF_SUBMODULE_SHORT = 0,
229 DIFF_SUBMODULE_LOG,
230 DIFF_SUBMODULE_INLINE_DIFF
234 * the set of options the calling program wants to affect the operation of
235 * diffcore library with.
237 struct diff_options {
238 const char *orderfile;
241 * "--rotate-to=<file>" would start showing at <file> and when
242 * the output reaches the end, wrap around by default.
243 * Setting skip_instead_of_rotate to true stops the output at the
244 * end, effectively discarding the earlier part of the output
245 * before <file>'s diff (this is used to implement the
246 * "--skip-to=<file>" option).
248 * When rotate_to_strict is set, it is an error if there is no
249 * <file> in the diff. Otherwise, the output starts at the
250 * path that is the same as, or first path that sorts after,
251 * <file>. Because it is unreasonable to require the exact
252 * match for "git log -p --rotate-to=<file>" (i.e. not all
253 * commit would touch that single <file>), "git log" sets it
254 * to false. "git diff" sets it to true to detect an error
255 * in the command line option.
257 const char *rotate_to;
258 int skip_instead_of_rotate;
259 int rotate_to_strict;
262 * A constant string (can and typically does contain newlines to look for
263 * a block of text, not just a single line) to filter out the filepairs
264 * that do not change the number of strings contained in its preimage and
265 * postimage of the diff_queue.
267 const char *pickaxe;
269 /* -I<regex> */
270 regex_t **ignore_regex;
271 size_t ignore_regex_nr, ignore_regex_alloc;
273 const char *single_follow;
274 const char *a_prefix, *b_prefix;
275 const char *line_prefix;
276 size_t line_prefix_length;
279 * collection of boolean options that affects the operation, but some do
280 * not have anything to do with the diffcore library.
282 struct diff_flags flags;
284 /* diff-filter bits */
285 unsigned int filter;
287 int use_color;
289 /* Number of context lines to generate in patch output. */
290 int context;
292 int interhunkcontext;
294 /* Affects the way detection logic for complete rewrites, renames and
295 * copies.
297 int break_opt;
298 int detect_rename;
300 int irreversible_delete;
301 int skip_stat_unmatch;
302 int line_termination;
304 /* The output format used when `diff_flush()` is run. */
305 int output_format;
307 unsigned pickaxe_opts;
309 /* Affects the way detection logic for complete rewrites, renames and
310 * copies.
312 int rename_score;
313 int rename_limit;
315 int needed_rename_limit;
316 int degraded_cc_to_c;
317 int show_rename_progress;
318 int dirstat_permille;
319 int setup;
321 /* Number of hexdigits to abbreviate raw format output to. */
322 int abbrev;
324 /* If non-zero, then stop computing after this many changes. */
325 int max_changes;
327 int ita_invisible_in_index;
328 /* white-space error highlighting */
329 #define WSEH_NEW (1<<12)
330 #define WSEH_CONTEXT (1<<13)
331 #define WSEH_OLD (1<<14)
332 unsigned ws_error_highlight;
333 const char *prefix;
334 int prefix_length;
335 const char *stat_sep;
336 int xdl_opts;
338 /* see Documentation/diff-options.txt */
339 char **anchors;
340 size_t anchors_nr, anchors_alloc;
342 int stat_width;
343 int stat_name_width;
344 int stat_graph_width;
345 int stat_count;
346 const char *word_regex;
347 enum diff_words_type word_diff;
348 enum diff_submodule_format submodule_format;
350 struct oidset *objfind;
352 /* this is set by diffcore for DIFF_FORMAT_PATCH */
353 int found_changes;
355 /* to support internal diff recursion by --follow hack*/
356 int found_follow;
358 /* Callback which allows tweaking the options in diff_setup_done(). */
359 void (*set_default)(struct diff_options *);
361 FILE *file;
362 int close_file;
364 #define OUTPUT_INDICATOR_NEW 0
365 #define OUTPUT_INDICATOR_OLD 1
366 #define OUTPUT_INDICATOR_CONTEXT 2
367 char output_indicators[3];
369 struct pathspec pathspec;
370 pathchange_fn_t pathchange;
371 change_fn_t change;
372 add_remove_fn_t add_remove;
373 void *change_fn_data;
374 diff_format_fn_t format_callback;
375 void *format_callback_data;
376 diff_prefix_fn_t output_prefix;
377 void *output_prefix_data;
379 int diff_path_counter;
381 struct emitted_diff_symbols *emitted_symbols;
382 enum {
383 COLOR_MOVED_NO = 0,
384 COLOR_MOVED_PLAIN = 1,
385 COLOR_MOVED_BLOCKS = 2,
386 COLOR_MOVED_ZEBRA = 3,
387 COLOR_MOVED_ZEBRA_DIM = 4,
388 } color_moved;
389 #define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
390 #define COLOR_MOVED_MIN_ALNUM_COUNT 20
392 /* XDF_WHITESPACE_FLAGS regarding block detection are set at 2, 3, 4 */
393 #define COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE (1<<5)
394 #define COLOR_MOVED_WS_ERROR (1<<0)
395 unsigned color_moved_ws_handling;
397 struct repository *repo;
398 struct option *parseopts;
400 int no_free;
403 unsigned diff_filter_bit(char status);
405 void diff_emit_submodule_del(struct diff_options *o, const char *line);
406 void diff_emit_submodule_add(struct diff_options *o, const char *line);
407 void diff_emit_submodule_untracked(struct diff_options *o, const char *path);
408 void diff_emit_submodule_modified(struct diff_options *o, const char *path);
409 void diff_emit_submodule_header(struct diff_options *o, const char *header);
410 void diff_emit_submodule_error(struct diff_options *o, const char *err);
411 void diff_emit_submodule_pipethrough(struct diff_options *o,
412 const char *line, int len);
414 struct diffstat_t {
415 int nr;
416 int alloc;
417 struct diffstat_file {
418 char *from_name;
419 char *name;
420 char *print_name;
421 const char *comments;
422 unsigned is_unmerged:1;
423 unsigned is_binary:1;
424 unsigned is_renamed:1;
425 unsigned is_interesting:1;
426 uintmax_t added, deleted;
427 } **files;
430 enum color_diff {
431 DIFF_RESET = 0,
432 DIFF_CONTEXT = 1,
433 DIFF_METAINFO = 2,
434 DIFF_FRAGINFO = 3,
435 DIFF_FILE_OLD = 4,
436 DIFF_FILE_NEW = 5,
437 DIFF_COMMIT = 6,
438 DIFF_WHITESPACE = 7,
439 DIFF_FUNCINFO = 8,
440 DIFF_FILE_OLD_MOVED = 9,
441 DIFF_FILE_OLD_MOVED_ALT = 10,
442 DIFF_FILE_OLD_MOVED_DIM = 11,
443 DIFF_FILE_OLD_MOVED_ALT_DIM = 12,
444 DIFF_FILE_NEW_MOVED = 13,
445 DIFF_FILE_NEW_MOVED_ALT = 14,
446 DIFF_FILE_NEW_MOVED_DIM = 15,
447 DIFF_FILE_NEW_MOVED_ALT_DIM = 16,
448 DIFF_CONTEXT_DIM = 17,
449 DIFF_FILE_OLD_DIM = 18,
450 DIFF_FILE_NEW_DIM = 19,
451 DIFF_CONTEXT_BOLD = 20,
452 DIFF_FILE_OLD_BOLD = 21,
453 DIFF_FILE_NEW_BOLD = 22,
456 const char *diff_get_color(int diff_use_color, enum color_diff ix);
457 #define diff_get_color_opt(o, ix) \
458 diff_get_color((o)->use_color, ix)
461 const char *diff_line_prefix(struct diff_options *);
464 extern const char mime_boundary_leader[];
466 struct combine_diff_path *diff_tree_paths(
467 struct combine_diff_path *p, const struct object_id *oid,
468 const struct object_id **parents_oid, int nparent,
469 struct strbuf *base, struct diff_options *opt);
470 void diff_tree_oid(const struct object_id *old_oid,
471 const struct object_id *new_oid,
472 const char *base, struct diff_options *opt);
473 void diff_root_tree_oid(const struct object_id *new_oid, const char *base,
474 struct diff_options *opt);
476 struct combine_diff_path {
477 struct combine_diff_path *next;
478 char *path;
479 unsigned int mode;
480 struct object_id oid;
481 struct combine_diff_parent {
482 char status;
483 unsigned int mode;
484 struct object_id oid;
485 struct strbuf path;
486 } parent[FLEX_ARRAY];
488 #define combine_diff_path_size(n, l) \
489 st_add4(sizeof(struct combine_diff_path), (l), 1, \
490 st_mult(sizeof(struct combine_diff_parent), (n)))
492 void show_combined_diff(struct combine_diff_path *elem, int num_parent,
493 struct rev_info *);
495 void diff_tree_combined(const struct object_id *oid, const struct oid_array *parents, struct rev_info *rev);
497 void diff_tree_combined_merge(const struct commit *commit, struct rev_info *rev);
499 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
501 int diff_can_quit_early(struct diff_options *);
503 void diff_addremove(struct diff_options *,
504 int addremove,
505 unsigned mode,
506 const struct object_id *oid,
507 int oid_valid,
508 const char *fullpath, unsigned dirty_submodule);
510 void diff_change(struct diff_options *,
511 unsigned mode1, unsigned mode2,
512 const struct object_id *old_oid,
513 const struct object_id *new_oid,
514 int old_oid_valid, int new_oid_valid,
515 const char *fullpath,
516 unsigned dirty_submodule1, unsigned dirty_submodule2);
518 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
520 void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat,
521 struct diff_queue_struct *q);
522 void free_diffstat_info(struct diffstat_t *diffstat);
524 #define DIFF_SETUP_REVERSE 1
525 #define DIFF_SETUP_USE_SIZE_CACHE 4
528 * Poor man's alternative to parse-option, to allow both stuck form
529 * (--option=value) and separate form (--option value).
531 int parse_long_opt(const char *opt, const char **argv,
532 const char **optarg);
534 int git_diff_basic_config(const char *var, const char *value, void *cb);
535 int git_diff_heuristic_config(const char *var, const char *value, void *cb);
536 void init_diff_ui_defaults(void);
537 int git_diff_ui_config(const char *var, const char *value, void *cb);
538 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
539 #define diff_setup(diffopts) repo_diff_setup(the_repository, diffopts)
540 #endif
541 void repo_diff_setup(struct repository *, struct diff_options *);
542 int diff_opt_parse(struct diff_options *, const char **, int, const char *);
543 void diff_setup_done(struct diff_options *);
544 int git_config_rename(const char *var, const char *value);
546 #define DIFF_DETECT_RENAME 1
547 #define DIFF_DETECT_COPY 2
549 #define DIFF_PICKAXE_ALL 1
550 #define DIFF_PICKAXE_REGEX 2
552 #define DIFF_PICKAXE_KIND_S 4 /* traditional plumbing counter */
553 #define DIFF_PICKAXE_KIND_G 8 /* grep in the patch */
554 #define DIFF_PICKAXE_KIND_OBJFIND 16 /* specific object IDs */
556 #define DIFF_PICKAXE_KINDS_MASK (DIFF_PICKAXE_KIND_S | \
557 DIFF_PICKAXE_KIND_G | \
558 DIFF_PICKAXE_KIND_OBJFIND)
560 #define DIFF_PICKAXE_IGNORE_CASE 32
562 void diffcore_std(struct diff_options *);
563 void diffcore_fix_diff_index(void);
565 #define COMMON_DIFF_OPTIONS_HELP \
566 "\ncommon diff options:\n" \
567 " -z output diff-raw with lines terminated with NUL.\n" \
568 " -p output patch format.\n" \
569 " -u synonym for -p.\n" \
570 " --patch-with-raw\n" \
571 " output both a patch and the diff-raw format.\n" \
572 " --stat show diffstat instead of patch.\n" \
573 " --numstat show numeric diffstat instead of patch.\n" \
574 " --patch-with-stat\n" \
575 " output a patch and prepend its diffstat.\n" \
576 " --name-only show only names of changed files.\n" \
577 " --name-status show names and status of changed files.\n" \
578 " --full-index show full object name on index lines.\n" \
579 " --abbrev=<n> abbreviate object names in diff-tree header and diff-raw.\n" \
580 " -R swap input file pairs.\n" \
581 " -B detect complete rewrites.\n" \
582 " -M detect renames.\n" \
583 " -C detect copies.\n" \
584 " --find-copies-harder\n" \
585 " try unchanged files as candidate for copy detection.\n" \
586 " -l<n> limit rename attempts up to <n> paths.\n" \
587 " -O<file> reorder diffs according to the <file>.\n" \
588 " -S<string> find filepair whose only one side contains the string.\n" \
589 " --pickaxe-all\n" \
590 " show all files diff when -S is used and hit is found.\n" \
591 " -a --text treat all files as text.\n"
593 int diff_queue_is_empty(void);
594 void diff_flush(struct diff_options*);
595 void diff_free(struct diff_options*);
596 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);
598 /* diff-raw status letters */
599 #define DIFF_STATUS_ADDED 'A'
600 #define DIFF_STATUS_COPIED 'C'
601 #define DIFF_STATUS_DELETED 'D'
602 #define DIFF_STATUS_MODIFIED 'M'
603 #define DIFF_STATUS_RENAMED 'R'
604 #define DIFF_STATUS_TYPE_CHANGED 'T'
605 #define DIFF_STATUS_UNKNOWN 'X'
606 #define DIFF_STATUS_UNMERGED 'U'
608 /* these are not diff-raw status letters proper, but used by
609 * diffcore-filter insn to specify additional restrictions.
611 #define DIFF_STATUS_FILTER_AON '*'
612 #define DIFF_STATUS_FILTER_BROKEN 'B'
615 * This is different from find_unique_abbrev() in that
616 * it stuffs the result with dots for alignment.
618 const char *diff_aligned_abbrev(const struct object_id *sha1, int);
620 void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb);
622 /* do not report anything on removed paths */
623 #define DIFF_SILENT_ON_REMOVED 01
624 /* report racily-clean paths as modified */
625 #define DIFF_RACY_IS_MODIFIED 02
626 int run_diff_files(struct rev_info *revs, unsigned int option);
628 #define DIFF_INDEX_CACHED 01
629 #define DIFF_INDEX_MERGE_BASE 02
630 int run_diff_index(struct rev_info *revs, unsigned int option);
632 int do_diff_cache(const struct object_id *, struct diff_options *);
633 int diff_flush_patch_id(struct diff_options *, struct object_id *, int, int);
634 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx);
636 int diff_result_code(struct diff_options *, int);
638 int diff_no_index(struct rev_info *,
639 int implicit_no_index, int, const char **);
641 int index_differs_from(struct repository *r, const char *def,
642 const struct diff_flags *flags,
643 int ita_invisible_in_index);
646 * Emit an interdiff of two object ID's to 'diff_options.file' optionally
647 * indented by 'indent' spaces.
649 void show_interdiff(const struct object_id *, const struct object_id *,
650 int indent, struct diff_options *);
653 * Fill the contents of the filespec "df", respecting any textconv defined by
654 * its userdiff driver. The "driver" parameter must come from a
655 * previous call to get_textconv(), and therefore should either be NULL or have
656 * textconv enabled.
658 * Note that the memory ownership of the resulting buffer depends on whether
659 * the driver field is NULL. If it is, then the memory belongs to the filespec
660 * struct. If it is non-NULL, then "outbuf" points to a newly allocated buffer
661 * that should be freed by the caller.
663 size_t fill_textconv(struct repository *r,
664 struct userdiff_driver *driver,
665 struct diff_filespec *df,
666 char **outbuf);
669 * Look up the userdiff driver for the given filespec, and return it if
670 * and only if it has textconv enabled (otherwise return NULL). The result
671 * can be passed to fill_textconv().
673 struct userdiff_driver *get_textconv(struct repository *r,
674 struct diff_filespec *one);
677 * Prepare diff_filespec and convert it using diff textconv API
678 * if the textconv driver exists.
679 * Return 1 if the conversion succeeds, 0 otherwise.
681 int textconv_object(struct repository *repo,
682 const char *path,
683 unsigned mode,
684 const struct object_id *oid, int oid_valid,
685 char **buf, unsigned long *buf_size);
687 int parse_rename_score(const char **cp_p);
689 long parse_algorithm_value(const char *value);
691 void print_stat_summary(FILE *fp, int files,
692 int insertions, int deletions);
693 void setup_diff_pager(struct diff_options *);
695 #endif /* DIFF_H */