revision.h

   1 #ifndef REVISION_H
   2 #define REVISION_H
   3
   4 #include "commit.h"
   5 #include "parse-options.h"
   6 #include "grep.h"
   7 #include "notes.h"
   8 #include "pretty.h"
   9 #include "diff.h"
  10 #include "commit-slab-decl.h"
  11
  12 /**
  13  * The revision walking API offers functions to build a list of revisions
  14  * and then iterate over that list.
  15  *
  16  * Calling sequence
  17  * ----------------
  18  *
  19  * The walking API has a given calling sequence: first you need to initialize
  20  * a rev_info structure, then add revisions to control what kind of revision
  21  * list do you want to get, finally you can iterate over the revision list.
  22  *
  23  */
  24
  25 /* Remember to update object flag allocation in object.h */
  26 #define SEEN            (1u<<0)
  27 #define UNINTERESTING   (1u<<1)
  28 #define TREESAME        (1u<<2)
  29 #define SHOWN           (1u<<3)
  30 #define TMP_MARK        (1u<<4) /* for isolated cases; clean after use */
  31 #define BOUNDARY        (1u<<5)
  32 #define CHILD_SHOWN     (1u<<6)
  33 #define ADDED           (1u<<7) /* Parents already parsed and added? */
  34 #define SYMMETRIC_LEFT  (1u<<8)
  35 #define PATCHSAME       (1u<<9)
  36 #define BOTTOM          (1u<<10)
  37
  38 /* WARNING: This is also used as REACHABLE in commit-graph.c. */
  39 #define PULL_MERGE      (1u<<15)
  40 /*
  41  * Indicates object was reached by traversal. i.e. not given by user on
  42  * command-line or stdin.
  43  * NEEDSWORK: NOT_USER_GIVEN doesn't apply to commits because we only support
  44  * filtering trees and blobs, but it may be useful to support filtering commits
  45  * in the future.
  46  */
  47 #define NOT_USER_GIVEN  (1u<<25)
  48 #define TRACK_LINEAR    (1u<<26)
  49 #define ALL_REV_FLAGS   (((1u<<11)-1) | NOT_USER_GIVEN | TRACK_LINEAR | PULL_MERGE)
  50
  51 #define TOPO_WALK_EXPLORED      (1u<<27)
  52 #define TOPO_WALK_INDEGREE      (1u<<28)
  53
  54 #define DECORATE_SHORT_REFS     1
  55 #define DECORATE_FULL_REFS      2
  56
  57 struct log_info;
  58 struct repository;
  59 struct rev_info;
  60 struct string_list;
  61 struct saved_parents;
  62 define_shared_commit_slab(revision_sources, char *);
  63
  64 struct rev_cmdline_info {
  65         unsigned int nr;
  66         unsigned int alloc;
  67         struct rev_cmdline_entry {
  68                 struct object *item;
  69                 const char *name;
  70                 enum {
  71                         REV_CMD_REF,
  72                         REV_CMD_PARENTS_ONLY,
  73                         REV_CMD_LEFT,
  74                         REV_CMD_RIGHT,
  75                         REV_CMD_MERGE_BASE,
  76                         REV_CMD_REV
  77                 } whence;
  78                 unsigned flags;
  79         } *rev;
  80 };
  81
  82 #define REVISION_WALK_WALK 0
  83 #define REVISION_WALK_NO_WALK_SORTED 1
  84 #define REVISION_WALK_NO_WALK_UNSORTED 2
  85
  86 struct oidset;
  87 struct topo_walk_info;
  88
  89 struct rev_info {
  90         /* Starting list */
  91         struct commit_list *commits;
  92         struct object_array pending;
  93         struct repository *repo;
  94
  95         /* Parents of shown commits */
  96         struct object_array boundary_commits;
  97
  98         /* The end-points specified by the end user */
  99         struct rev_cmdline_info cmdline;
 100
 101         /* excluding from --branches, --refs, etc. expansion */
 102         struct string_list *ref_excludes;
 103
 104         /* Basic information */
 105         const char *prefix;
 106         const char *def;
 107         struct pathspec prune_data;
 108
 109         /*
 110          * Whether the arguments parsed by setup_revisions() included any
 111          * "input" revisions that might still have yielded an empty pending
 112          * list (e.g., patterns like "--all" or "--glob").
 113          */
 114         int rev_input_given;
 115
 116         /*
 117          * Whether we read from stdin due to the --stdin option.
 118          */
 119         int read_from_stdin;
 120
 121         /* topo-sort */
 122         enum rev_sort_order sort_order;
 123
 124         unsigned int early_output;
 125
 126         unsigned int    ignore_missing:1,
 127                         ignore_missing_links:1;
 128
 129         /* Traversal flags */
 130         unsigned int    dense:1,
 131                         prune:1,
 132                         no_walk:2,
 133                         remove_empty_trees:1,
 134                         simplify_history:1,
 135                         show_pulls:1,
 136                         topo_order:1,
 137                         simplify_merges:1,
 138                         simplify_by_decoration:1,
 139                         single_worktree:1,
 140                         tag_objects:1,
 141                         tree_objects:1,
 142                         blob_objects:1,
 143                         verify_objects:1,
 144                         edge_hint:1,
 145                         edge_hint_aggressive:1,
 146                         limited:1,
 147                         unpacked:1,
 148                         boundary:2,
 149                         count:1,
 150                         left_right:1,
 151                         left_only:1,
 152                         right_only:1,
 153                         rewrite_parents:1,
 154                         print_parents:1,
 155                         show_decorations:1,
 156                         reverse:1,
 157                         reverse_output_stage:1,
 158                         cherry_pick:1,
 159                         cherry_mark:1,
 160                         bisect:1,
 161                         ancestry_path:1,
 162                         first_parent_only:1,
 163                         line_level_traverse:1,
 164                         tree_blobs_in_commit_order:1,
 165
 166                         /*
 167                          * Blobs are shown without regard for their existence.
 168                          * But not so for trees: unless exclude_promisor_objects
 169                          * is set and the tree in question is a promisor object;
 170                          * OR ignore_missing_links is set, the revision walker
 171                          * dies with a "bad tree object HASH" message when
 172                          * encountering a missing tree. For callers that can
 173                          * handle missing trees and want them to be filterable
 174                          * and showable, set this to true. The revision walker
 175                          * will filter and show such a missing tree as usual,
 176                          * but will not attempt to recurse into this tree
 177                          * object.
 178                          */
 179                         do_not_die_on_missing_tree:1,
 180
 181                         /* for internal use only */
 182                         exclude_promisor_objects:1;
 183
 184         /* Diff flags */
 185         unsigned int    diff:1,
 186                         full_diff:1,
 187                         show_root_diff:1,
 188                         no_commit_id:1,
 189                         verbose_header:1,
 190                         ignore_merges:1,
 191                         combine_merges:1,
 192                         combined_all_paths:1,
 193                         dense_combined_merges:1,
 194                         always_show_header:1;
 195
 196         /* Format info */
 197         int             show_notes;
 198         unsigned int    shown_one:1,
 199                         shown_dashes:1,
 200                         show_merge:1,
 201                         show_notes_given:1,
 202                         show_signature:1,
 203                         pretty_given:1,
 204                         abbrev_commit:1,
 205                         abbrev_commit_given:1,
 206                         zero_commit:1,
 207                         use_terminator:1,
 208                         missing_newline:1,
 209                         date_mode_explicit:1,
 210                         preserve_subject:1,
 211                         encode_email_headers:1;
 212         unsigned int    disable_stdin:1;
 213         /* --show-linear-break */
 214         unsigned int    track_linear:1,
 215                         track_first_time:1,
 216                         linear:1;
 217
 218         struct date_mode date_mode;
 219         int             expand_tabs_in_log; /* unset if negative */
 220         int             expand_tabs_in_log_default;
 221
 222         unsigned int    abbrev;
 223         enum cmit_fmt   commit_format;
 224         struct log_info *loginfo;
 225         int             nr, total;
 226         const char      *mime_boundary;
 227         const char      *patch_suffix;
 228         int             numbered_files;
 229         int             reroll_count;
 230         char            *message_id;
 231         struct ident_split from_ident;
 232         struct string_list *ref_message_ids;
 233         int             add_signoff;
 234         const char      *extra_headers;
 235         const char      *log_reencode;
 236         const char      *subject_prefix;
 237         int             no_inline;
 238         int             show_log_size;
 239         struct string_list *mailmap;
 240
 241         /* Filter by commit log message */
 242         struct grep_opt grep_filter;
 243         /* Negate the match of grep_filter */
 244         int invert_grep;
 245
 246         /* Display history graph */
 247         struct git_graph *graph;
 248
 249         /* special limits */
 250         int skip_count;
 251         int max_count;
 252         timestamp_t max_age;
 253         timestamp_t min_age;
 254         int min_parents;
 255         int max_parents;
 256         int (*include_check)(struct commit *, void *);
 257         void *include_check_data;
 258
 259         /* diff info for patches and for paths limiting */
 260         struct diff_options diffopt;
 261         struct diff_options pruning;
 262
 263         struct reflog_walk_info *reflog_info;
 264         struct decoration children;
 265         struct decoration merge_simplification;
 266         struct decoration treesame;
 267
 268         /* notes-specific options: which refs to show */
 269         struct display_notes_opt notes_opt;
 270
 271         /* interdiff */
 272         const struct object_id *idiff_oid1;
 273         const struct object_id *idiff_oid2;
 274         const char *idiff_title;
 275
 276         /* range-diff */
 277         const char *rdiff1;
 278         const char *rdiff2;
 279         int creation_factor;
 280         const char *rdiff_title;
 281
 282         /* commit counts */
 283         int count_left;
 284         int count_right;
 285         int count_same;
 286
 287         /* line level range that we are chasing */
 288         struct decoration line_log_data;
 289
 290         /* copies of the parent lists, for --full-diff display */
 291         struct saved_parents *saved_parents_slab;
 292
 293         struct commit_list *previous_parents;
 294         const char *break_bar;
 295
 296         struct revision_sources *sources;
 297
 298         struct topo_walk_info *topo_walk_info;
 299 };
 300
 301 int ref_excluded(struct string_list *, const char *path);
 302 void clear_ref_exclusion(struct string_list **);
 303 void add_ref_exclusion(struct string_list **, const char *exclude);
 304
 305
 306 #define REV_TREE_SAME           0
 307 #define REV_TREE_NEW            1       /* Only new files */
 308 #define REV_TREE_OLD            2       /* Only files removed */
 309 #define REV_TREE_DIFFERENT      3       /* Mixed changes */
 310
 311 /* revision.c */
 312 typedef void (*show_early_output_fn_t)(struct rev_info *, struct commit_list *);
 313 extern volatile show_early_output_fn_t show_early_output;
 314
 315 struct setup_revision_opt {
 316         const char *def;
 317         void (*tweak)(struct rev_info *, struct setup_revision_opt *);
 318         const char *submodule;  /* TODO: drop this and use rev_info->repo */
 319         unsigned int    assume_dashdash:1,
 320                         allow_exclude_promisor_objects:1;
 321         unsigned revarg_opt;
 322 };
 323
 324 #ifndef NO_THE_REPOSITORY_COMPATIBILITY_MACROS
 325 #define init_revisions(revs, prefix) repo_init_revisions(the_repository, revs, prefix)
 326 #endif
 327
 328 /**
 329  * Initialize a rev_info structure with default values. The third parameter may
 330  * be NULL or can be prefix path, and then the `.prefix` variable will be set
 331  * to it. This is typically the first function you want to call when you want
 332  * to deal with a revision list. After calling this function, you are free to
 333  * customize options, like set `.ignore_merges` to 0 if you don't want to
 334  * ignore merges, and so on.
 335  */
 336 void repo_init_revisions(struct repository *r,
 337                          struct rev_info *revs,
 338                          const char *prefix);
 339
 340 /**
 341  * Parse revision information, filling in the `rev_info` structure, and
 342  * removing the used arguments from the argument list. Returns the number
 343  * of arguments left that weren't recognized, which are also moved to the
 344  * head of the argument list. The last parameter is used in case no
 345  * parameter given by the first two arguments.
 346  */
 347 int setup_revisions(int argc, const char **argv, struct rev_info *revs,
 348                     struct setup_revision_opt *);
 349
 350 void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ctx,
 351                         const struct option *options,
 352                         const char * const usagestr[]);
 353 #define REVARG_CANNOT_BE_FILENAME 01
 354 #define REVARG_COMMITTISH 02
 355 int handle_revision_arg(const char *arg, struct rev_info *revs,
 356                         int flags, unsigned revarg_opt);
 357
 358 /**
 359  * Reset the flags used by the revision walking api. You can use this to do
 360  * multiple sequential revision walks.
 361  */
 362 void reset_revision_walk(void);
 363
 364 /**
 365  * Prepares the rev_info structure for a walk. You should check if it returns
 366  * any error (non-zero return code) and if it does not, you can start using
 367  * get_revision() to do the iteration.
 368  */
 369 int prepare_revision_walk(struct rev_info *revs);
 370
 371 /**
 372  * Takes a pointer to a `rev_info` structure and iterates over it, returning a
 373  * `struct commit *` each time you call it. The end of the revision list is
 374  * indicated by returning a NULL pointer.
 375  */
 376 struct commit *get_revision(struct rev_info *revs);
 377
 378 const char *get_revision_mark(const struct rev_info *revs,
 379                               const struct commit *commit);
 380 void put_revision_mark(const struct rev_info *revs,
 381                        const struct commit *commit);
 382
 383 void mark_parents_uninteresting(struct commit *commit);
 384 void mark_tree_uninteresting(struct repository *r, struct tree *tree);
 385 void mark_trees_uninteresting_sparse(struct repository *r, struct oidset *trees);
 386
 387 void show_object_with_name(FILE *, struct object *, const char *);
 388
 389 /**
 390  * This function can be used if you want to add commit objects as revision
 391  * information. You can use the `UNINTERESTING` object flag to indicate if
 392  * you want to include or exclude the given commit (and commits reachable
 393  * from the given commit) from the revision list.
 394  *
 395  * NOTE: If you have the commits as a string list then you probably want to
 396  * use setup_revisions(), instead of parsing each string and using this
 397  * function.
 398  */
 399 void add_pending_object(struct rev_info *revs,
 400                         struct object *obj, const char *name);
 401
 402 void add_pending_oid(struct rev_info *revs,
 403                      const char *name, const struct object_id *oid,
 404                      unsigned int flags);
 405
 406 void add_head_to_pending(struct rev_info *);
 407 void add_reflogs_to_pending(struct rev_info *, unsigned int flags);
 408 void add_index_objects_to_pending(struct rev_info *, unsigned int flags);
 409
 410 enum commit_action {
 411         commit_ignore,
 412         commit_show,
 413         commit_error
 414 };
 415
 416 enum commit_action get_commit_action(struct rev_info *revs,
 417                                      struct commit *commit);
 418 enum commit_action simplify_commit(struct rev_info *revs,
 419                                    struct commit *commit);
 420
 421 enum rewrite_result {
 422         rewrite_one_ok,
 423         rewrite_one_noparents,
 424         rewrite_one_error
 425 };
 426
 427 typedef enum rewrite_result (*rewrite_parent_fn_t)(struct rev_info *revs, struct commit **pp);
 428
 429 int rewrite_parents(struct rev_info *revs,
 430                     struct commit *commit,
 431                     rewrite_parent_fn_t rewrite_parent);
 432
 433 /*
 434  * The log machinery saves the original parent list so that
 435  * get_saved_parents() can later tell what the real parents of the
 436  * commits are, when commit->parents has been modified by history
 437  * simpification.
 438  *
 439  * get_saved_parents() will transparently return commit->parents if
 440  * history simplification is off.
 441  */
 442 struct commit_list *get_saved_parents(struct rev_info *revs, const struct commit *commit);
 443
 444 #endif