diff.h

   1 /*
   2  * Copyright (C) 2005 Junio C Hamano
   3  */
   4 #ifndef DIFF_H
   5 #define DIFF_H
   6
   7 #include "tree-walk.h"
   8 #include "pathspec.h"
   9 #include "object.h"
  10 #include "oidset.h"
  11
  12 struct combine_diff_path;
  13 struct commit;
  14 struct diff_filespec;
  15 struct diff_options;
  16 struct diff_queue_struct;
  17 struct oid_array;
  18 struct option;
  19 struct repository;
  20 struct rev_info;
  21 struct strbuf;
  22 struct userdiff_driver;
  23
  24 typedef int (*pathchange_fn_t)(struct diff_options *options,
  25                  struct combine_diff_path *path);
  26
  27 typedef void (*change_fn_t)(struct diff_options *options,
  28                  unsigned old_mode, unsigned new_mode,
  29                  const struct object_id *old_oid,
  30                  const struct object_id *new_oid,
  31                  int old_oid_valid, int new_oid_valid,
  32                  const char *fullpath,
  33                  unsigned old_dirty_submodule, unsigned new_dirty_submodule);
  34
  35 typedef void (*add_remove_fn_t)(struct diff_options *options,
  36                     int addremove, unsigned mode,
  37                     const struct object_id *oid,
  38                     int oid_valid,
  39                     const char *fullpath, unsigned dirty_submodule);
  40
  41 typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
  42                 struct diff_options *options, void *data);
  43
  44 typedef struct strbuf *(*diff_prefix_fn_t)(struct diff_options *opt, void *data);
  45
  46 #define DIFF_FORMAT_RAW         0x0001
  47 #define DIFF_FORMAT_DIFFSTAT    0x0002
  48 #define DIFF_FORMAT_NUMSTAT     0x0004
  49 #define DIFF_FORMAT_SUMMARY     0x0008
  50 #define DIFF_FORMAT_PATCH       0x0010
  51 #define DIFF_FORMAT_SHORTSTAT   0x0020
  52 #define DIFF_FORMAT_DIRSTAT     0x0040
  53
  54 /* These override all above */
  55 #define DIFF_FORMAT_NAME        0x0100
  56 #define DIFF_FORMAT_NAME_STATUS 0x0200
  57 #define DIFF_FORMAT_CHECKDIFF   0x0400
  58
  59 /* Same as output_format = 0 but we know that -s flag was given
  60  * and we should not give default value to output_format.
  61  */
  62 #define DIFF_FORMAT_NO_OUTPUT   0x0800
  63
  64 #define DIFF_FORMAT_CALLBACK    0x1000
  65
  66 #define DIFF_FLAGS_INIT { 0 }
  67 struct diff_flags {
  68         unsigned recursive;
  69         unsigned tree_in_recursive;
  70         unsigned binary;
  71         unsigned text;
  72         unsigned full_index;
  73         unsigned silent_on_remove;
  74         unsigned find_copies_harder;
  75         unsigned follow_renames;
  76         unsigned rename_empty;
  77         unsigned has_changes;
  78         unsigned quick;
  79         unsigned no_index;
  80         unsigned allow_external;
  81         unsigned exit_with_status;
  82         unsigned reverse_diff;
  83         unsigned check_failed;
  84         unsigned relative_name;
  85         unsigned ignore_submodules;
  86         unsigned dirstat_cumulative;
  87         unsigned dirstat_by_file;
  88         unsigned allow_textconv;
  89         unsigned textconv_set_via_cmdline;
  90         unsigned diff_from_contents;
  91         unsigned dirty_submodules;
  92         unsigned ignore_untracked_in_submodules;
  93         unsigned ignore_dirty_submodules;
  94         unsigned override_submodule_config;
  95         unsigned dirstat_by_line;
  96         unsigned funccontext;
  97         unsigned default_follow_renames;
  98         unsigned stat_with_summary;
  99         unsigned suppress_diff_headers;
 100         unsigned dual_color_diffed_diffs;
 101         unsigned suppress_hunk_header_line_count;
 102 };
 103
 104 static inline void diff_flags_or(struct diff_flags *a,
 105                                  const struct diff_flags *b)
 106 {
 107         char *tmp_a = (char *)a;
 108         const char *tmp_b = (const char *)b;
 109         int i;
 110
 111         for (i = 0; i < sizeof(struct diff_flags); i++)
 112                 tmp_a[i] |= tmp_b[i];
 113 }
 114
 115 #define DIFF_XDL_TST(opts, flag)    ((opts)->xdl_opts & XDF_##flag)
 116 #define DIFF_XDL_SET(opts, flag)    ((opts)->xdl_opts |= XDF_##flag)
 117 #define DIFF_XDL_CLR(opts, flag)    ((opts)->xdl_opts &= ~XDF_##flag)
 118
 119 #define DIFF_WITH_ALG(opts, flag)   (((opts)->xdl_opts & ~XDF_DIFF_ALGORITHM_MASK) | XDF_##flag)
 120
 121 enum diff_words_type {
 122         DIFF_WORDS_NONE = 0,
 123         DIFF_WORDS_PORCELAIN,
 124         DIFF_WORDS_PLAIN,
 125         DIFF_WORDS_COLOR
 126 };
 127
 128 enum diff_submodule_format {
 129         DIFF_SUBMODULE_SHORT = 0,
 130         DIFF_SUBMODULE_LOG,
 131         DIFF_SUBMODULE_INLINE_DIFF
 132 };
 133
 134 struct diff_options {
 135         const char *orderfile;
 136         const char *pickaxe;
 137         const char *single_follow;
 138         const char *a_prefix, *b_prefix;
 139         const char *line_prefix;
 140         size_t line_prefix_length;
 141         struct diff_flags flags;
 142
 143         /* diff-filter bits */
 144         unsigned int filter;
 145
 146         int use_color;
 147         int context;
 148         int interhunkcontext;
 149         int break_opt;
 150         int detect_rename;
 151         int irreversible_delete;
 152         int skip_stat_unmatch;
 153         int line_termination;
 154         int output_format;
 155         unsigned pickaxe_opts;
 156         int rename_score;
 157         int rename_limit;
 158         int needed_rename_limit;
 159         int degraded_cc_to_c;
 160         int show_rename_progress;
 161         int dirstat_permille;
 162         int setup;
 163         int abbrev;
 164         int ita_invisible_in_index;
 165 /* white-space error highlighting */
 166 #define WSEH_NEW (1<<12)
 167 #define WSEH_CONTEXT (1<<13)
 168 #define WSEH_OLD (1<<14)
 169         unsigned ws_error_highlight;
 170         const char *prefix;
 171         int prefix_length;
 172         const char *stat_sep;
 173         int xdl_opts;
 174
 175         /* see Documentation/diff-options.txt */
 176         char **anchors;
 177         size_t anchors_nr, anchors_alloc;
 178
 179         int stat_width;
 180         int stat_name_width;
 181         int stat_graph_width;
 182         int stat_count;
 183         const char *word_regex;
 184         enum diff_words_type word_diff;
 185         enum diff_submodule_format submodule_format;
 186
 187         struct oidset *objfind;
 188
 189         /* this is set by diffcore for DIFF_FORMAT_PATCH */
 190         int found_changes;
 191
 192         /* to support internal diff recursion by --follow hack*/
 193         int found_follow;
 194
 195         void (*set_default)(struct diff_options *);
 196
 197         FILE *file;
 198         int close_file;
 199
 200 #define OUTPUT_INDICATOR_NEW 0
 201 #define OUTPUT_INDICATOR_OLD 1
 202 #define OUTPUT_INDICATOR_CONTEXT 2
 203         char output_indicators[3];
 204
 205         struct pathspec pathspec;
 206         pathchange_fn_t pathchange;
 207         change_fn_t change;
 208         add_remove_fn_t add_remove;
 209         void *change_fn_data;
 210         diff_format_fn_t format_callback;
 211         void *format_callback_data;
 212         diff_prefix_fn_t output_prefix;
 213         void *output_prefix_data;
 214
 215         int diff_path_counter;
 216
 217         struct emitted_diff_symbols *emitted_symbols;
 218         enum {
 219                 COLOR_MOVED_NO = 0,
 220                 COLOR_MOVED_PLAIN = 1,
 221                 COLOR_MOVED_BLOCKS = 2,
 222                 COLOR_MOVED_ZEBRA = 3,
 223                 COLOR_MOVED_ZEBRA_DIM = 4,
 224         } color_moved;
 225         #define COLOR_MOVED_DEFAULT COLOR_MOVED_ZEBRA
 226         #define COLOR_MOVED_MIN_ALNUM_COUNT 20
 227
 228         /* XDF_WHITESPACE_FLAGS regarding block detection are set at 2, 3, 4 */
 229         #define COLOR_MOVED_WS_ALLOW_INDENTATION_CHANGE (1<<5)
 230         #define COLOR_MOVED_WS_ERROR (1<<0)
 231         unsigned color_moved_ws_handling;
 232
 233         struct repository *repo;
 234         struct option *parseopts;
 235 };
 236
 237 unsigned diff_filter_bit(char status);
 238
 239 void diff_emit_submodule_del(struct diff_options *o, const char *line);
 240 void diff_emit_submodule_add(struct diff_options *o, const char *line);
 241 void diff_emit_submodule_untracked(struct diff_options *o, const char *path);
 242 void diff_emit_submodule_modified(struct diff_options *o, const char *path);
 243 void diff_emit_submodule_header(struct diff_options *o, const char *header);
 244 void diff_emit_submodule_error(struct diff_options *o, const char *err);
 245 void diff_emit_submodule_pipethrough(struct diff_options *o,
 246                                      const char *line, int len);
 247
 248 struct diffstat_t {
 249         int nr;
 250         int alloc;
 251         struct diffstat_file {
 252                 char *from_name;
 253                 char *name;
 254                 char *print_name;
 255                 const char *comments;
 256                 unsigned is_unmerged:1;
 257                 unsigned is_binary:1;
 258                 unsigned is_renamed:1;
 259                 unsigned is_interesting:1;
 260                 uintmax_t added, deleted;
 261         } **files;
 262 };
 263
 264 enum color_diff {
 265         DIFF_RESET = 0,
 266         DIFF_CONTEXT = 1,
 267         DIFF_METAINFO = 2,
 268         DIFF_FRAGINFO = 3,
 269         DIFF_FILE_OLD = 4,
 270         DIFF_FILE_NEW = 5,
 271         DIFF_COMMIT = 6,
 272         DIFF_WHITESPACE = 7,
 273         DIFF_FUNCINFO = 8,
 274         DIFF_FILE_OLD_MOVED = 9,
 275         DIFF_FILE_OLD_MOVED_ALT = 10,
 276         DIFF_FILE_OLD_MOVED_DIM = 11,
 277         DIFF_FILE_OLD_MOVED_ALT_DIM = 12,
 278         DIFF_FILE_NEW_MOVED = 13,
 279         DIFF_FILE_NEW_MOVED_ALT = 14,
 280         DIFF_FILE_NEW_MOVED_DIM = 15,
 281         DIFF_FILE_NEW_MOVED_ALT_DIM = 16,
 282         DIFF_CONTEXT_DIM = 17,
 283         DIFF_FILE_OLD_DIM = 18,
 284         DIFF_FILE_NEW_DIM = 19,
 285         DIFF_CONTEXT_BOLD = 20,
 286         DIFF_FILE_OLD_BOLD = 21,
 287         DIFF_FILE_NEW_BOLD = 22,
 288 };
 289 const char *diff_get_color(int diff_use_color, enum color_diff ix);
 290 #define diff_get_color_opt(o, ix) \
 291         diff_get_color((o)->use_color, ix)
 292
 293
 294 const char *diff_line_prefix(struct diff_options *);
 295
 296
 297 extern const char mime_boundary_leader[];
 298
 299 struct combine_diff_path *diff_tree_paths(
 300         struct combine_diff_path *p, const struct object_id *oid,
 301         const struct object_id **parents_oid, int nparent,
 302         struct strbuf *base, struct diff_options *opt);
 303 int diff_tree_oid(const struct object_id *old_oid,
 304                   const struct object_id *new_oid,
 305                   const char *base, struct diff_options *opt);
 306 int diff_root_tree_oid(const struct object_id *new_oid, const char *base,
 307                        struct diff_options *opt);
 308
 309 struct combine_diff_path {
 310         struct combine_diff_path *next;
 311         char *path;
 312         unsigned int mode;
 313         struct object_id oid;
 314         struct combine_diff_parent {
 315                 char status;
 316                 unsigned int mode;
 317                 struct object_id oid;
 318                 struct strbuf path;
 319         } parent[FLEX_ARRAY];
 320 };
 321 #define combine_diff_path_size(n, l) \
 322         st_add4(sizeof(struct combine_diff_path), (l), 1, \
 323                 st_mult(sizeof(struct combine_diff_parent), (n)))
 324
 325 void show_combined_diff(struct combine_diff_path *elem, int num_parent,
 326                         int dense, struct rev_info *);
 327
 328 void diff_tree_combined(const struct object_id *oid, const struct oid_array *parents, int dense, struct rev_info *rev);
 329
 330 void diff_tree_combined_merge(const struct commit *commit, int dense, struct rev_info *rev);
 331
 332 void diff_set_mnemonic_prefix(struct diff_options *options, const char *a, const char *b);
 333
 334 int diff_can_quit_early(struct diff_options *);
 335
 336 void diff_addremove(struct diff_options *,
 337                     int addremove,
 338                     unsigned mode,
 339                     const struct object_id *oid,
 340                     int oid_valid,
 341                     const char *fullpath, unsigned dirty_submodule);
 342
 343 void diff_change(struct diff_options *,
 344                  unsigned mode1, unsigned mode2,
 345                  const struct object_id *old_oid,
 346                  const struct object_id *new_oid,
 347                  int old_oid_valid, int new_oid_valid,
 348                  const char *fullpath,
 349                  unsigned dirty_submodule1, unsigned dirty_submodule2);
 350
 351 struct diff_filepair *diff_unmerge(struct diff_options *, const char *path);
 352
 353 void compute_diffstat(struct diff_options *options, struct diffstat_t *diffstat,
 354                       struct diff_queue_struct *q);
 355 void free_diffstat_info(struct diffstat_t *diffstat);
 356
 357 #define DIFF_SETUP_REVERSE              1
 358 #define DIFF_SETUP_USE_SIZE_CACHE       4
 359
 360 /*
 361  * Poor man's alternative to parse-option, to allow both stuck form
 362  * (--option=value) and separate form (--option value).
 363  */
 364 int parse_long_opt(const char *opt, const char **argv,
 365                    const char **optarg);
 366
 367 int git_diff_basic_config(const char *var, const char *value, void *cb);
 368 int git_diff_heuristic_config(const char *var, const char *value, void *cb);
 369 void init_diff_ui_defaults(void);
 370 int git_diff_ui_config(const char *var, const char *value, void *cb);
 371 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 372 #define diff_setup(diffopts) repo_diff_setup(the_repository, diffopts)
 373 #endif
 374 void repo_diff_setup(struct repository *, struct diff_options *);
 375 int diff_opt_parse(struct diff_options *, const char **, int, const char *);
 376 void diff_setup_done(struct diff_options *);
 377 int git_config_rename(const char *var, const char *value);
 378
 379 #define DIFF_DETECT_RENAME      1
 380 #define DIFF_DETECT_COPY        2
 381
 382 #define DIFF_PICKAXE_ALL        1
 383 #define DIFF_PICKAXE_REGEX      2
 384
 385 #define DIFF_PICKAXE_KIND_S     4 /* traditional plumbing counter */
 386 #define DIFF_PICKAXE_KIND_G     8 /* grep in the patch */
 387 #define DIFF_PICKAXE_KIND_OBJFIND       16 /* specific object IDs */
 388
 389 #define DIFF_PICKAXE_KINDS_MASK (DIFF_PICKAXE_KIND_S | \
 390                                  DIFF_PICKAXE_KIND_G | \
 391                                  DIFF_PICKAXE_KIND_OBJFIND)
 392
 393 #define DIFF_PICKAXE_IGNORE_CASE        32
 394
 395 void diffcore_std(struct diff_options *);
 396 void diffcore_fix_diff_index(void);
 397
 398 #define COMMON_DIFF_OPTIONS_HELP \
 399 "\ncommon diff options:\n" \
 400 "  -z            output diff-raw with lines terminated with NUL.\n" \
 401 "  -p            output patch format.\n" \
 402 "  -u            synonym for -p.\n" \
 403 "  --patch-with-raw\n" \
 404 "                output both a patch and the diff-raw format.\n" \
 405 "  --stat        show diffstat instead of patch.\n" \
 406 "  --numstat     show numeric diffstat instead of patch.\n" \
 407 "  --patch-with-stat\n" \
 408 "                output a patch and prepend its diffstat.\n" \
 409 "  --name-only   show only names of changed files.\n" \
 410 "  --name-status show names and status of changed files.\n" \
 411 "  --full-index  show full object name on index lines.\n" \
 412 "  --abbrev=<n>  abbreviate object names in diff-tree header and diff-raw.\n" \
 413 "  -R            swap input file pairs.\n" \
 414 "  -B            detect complete rewrites.\n" \
 415 "  -M            detect renames.\n" \
 416 "  -C            detect copies.\n" \
 417 "  --find-copies-harder\n" \
 418 "                try unchanged files as candidate for copy detection.\n" \
 419 "  -l<n>         limit rename attempts up to <n> paths.\n" \
 420 "  -O<file>      reorder diffs according to the <file>.\n" \
 421 "  -S<string>    find filepair whose only one side contains the string.\n" \
 422 "  --pickaxe-all\n" \
 423 "                show all files diff when -S is used and hit is found.\n" \
 424 "  -a  --text    treat all files as text.\n"
 425
 426 int diff_queue_is_empty(void);
 427 void diff_flush(struct diff_options*);
 428 void diff_warn_rename_limit(const char *varname, int needed, int degraded_cc);
 429
 430 /* diff-raw status letters */
 431 #define DIFF_STATUS_ADDED               'A'
 432 #define DIFF_STATUS_COPIED              'C'
 433 #define DIFF_STATUS_DELETED             'D'
 434 #define DIFF_STATUS_MODIFIED            'M'
 435 #define DIFF_STATUS_RENAMED             'R'
 436 #define DIFF_STATUS_TYPE_CHANGED        'T'
 437 #define DIFF_STATUS_UNKNOWN             'X'
 438 #define DIFF_STATUS_UNMERGED            'U'
 439
 440 /* these are not diff-raw status letters proper, but used by
 441  * diffcore-filter insn to specify additional restrictions.
 442  */
 443 #define DIFF_STATUS_FILTER_AON          '*'
 444 #define DIFF_STATUS_FILTER_BROKEN       'B'
 445
 446 /*
 447  * This is different from find_unique_abbrev() in that
 448  * it stuffs the result with dots for alignment.
 449  */
 450 const char *diff_aligned_abbrev(const struct object_id *sha1, int);
 451
 452 /* do not report anything on removed paths */
 453 #define DIFF_SILENT_ON_REMOVED 01
 454 /* report racily-clean paths as modified */
 455 #define DIFF_RACY_IS_MODIFIED 02
 456 int run_diff_files(struct rev_info *revs, unsigned int option);
 457 int run_diff_index(struct rev_info *revs, int cached);
 458
 459 int do_diff_cache(const struct object_id *, struct diff_options *);
 460 int diff_flush_patch_id(struct diff_options *, struct object_id *, int, int);
 461 void flush_one_hunk(struct object_id *result, git_hash_ctx *ctx);
 462
 463 int diff_result_code(struct diff_options *, int);
 464
 465 int diff_no_index(struct rev_info *,
 466                   int implicit_no_index, int, const char **);
 467
 468 int index_differs_from(struct repository *r, const char *def,
 469                        const struct diff_flags *flags,
 470                        int ita_invisible_in_index);
 471
 472 /*
 473  * Fill the contents of the filespec "df", respecting any textconv defined by
 474  * its userdiff driver.  The "driver" parameter must come from a
 475  * previous call to get_textconv(), and therefore should either be NULL or have
 476  * textconv enabled.
 477  *
 478  * Note that the memory ownership of the resulting buffer depends on whether
 479  * the driver field is NULL. If it is, then the memory belongs to the filespec
 480  * struct. If it is non-NULL, then "outbuf" points to a newly allocated buffer
 481  * that should be freed by the caller.
 482  */
 483 size_t fill_textconv(struct repository *r,
 484                      struct userdiff_driver *driver,
 485                      struct diff_filespec *df,
 486                      char **outbuf);
 487
 488 /*
 489  * Look up the userdiff driver for the given filespec, and return it if
 490  * and only if it has textconv enabled (otherwise return NULL). The result
 491  * can be passed to fill_textconv().
 492  */
 493 struct userdiff_driver *get_textconv(struct repository *r,
 494                                      struct diff_filespec *one);
 495
 496 /*
 497  * Prepare diff_filespec and convert it using diff textconv API
 498  * if the textconv driver exists.
 499  * Return 1 if the conversion succeeds, 0 otherwise.
 500  */
 501 int textconv_object(struct repository *repo,
 502                     const char *path,
 503                     unsigned mode,
 504                     const struct object_id *oid, int oid_valid,
 505                     char **buf, unsigned long *buf_size);
 506
 507 int parse_rename_score(const char **cp_p);
 508
 509 long parse_algorithm_value(const char *value);
 510
 511 void print_stat_summary(FILE *fp, int files,
 512                         int insertions, int deletions);
 513 void setup_diff_pager(struct diff_options *);
 514
 515 #endif /* DIFF_H */