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