examples/status.c

   1 /*
   2  * libgit2 "status" example - shows how to use the status APIs
   3  *
   4  * Written by the libgit2 contributors
   5  *
   6  * To the extent possible under law, the author(s) have dedicated all copyright
   7  * and related and neighboring rights to this software to the public domain
   8  * worldwide. This software is distributed without any warranty.
   9  *
  10  * You should have received a copy of the CC0 Public Domain Dedication along
  11  * with this software. If not, see
  12  * <http://creativecommons.org/publicdomain/zero/1.0/>.
  13  */
  14
  15 #include "common.h"
  16
  17 /**
  18  * This example demonstrates the use of the libgit2 status APIs,
  19  * particularly the `git_status_list` object, to roughly simulate the
  20  * output of running `git status`.  It serves as a simple example of
  21  * using those APIs to get basic status information.
  22  *
  23  * This does not have:
  24  *
  25  * - Robust error handling
  26  * - Colorized or paginated output formatting
  27  *
  28  * This does have:
  29  *
  30  * - Examples of translating command line arguments to the status
  31  *   options settings to mimic `git status` results.
  32  * - A sample status formatter that matches the default "long" format
  33  *   from `git status`
  34  * - A sample status formatter that matches the "short" format
  35  */
  36
  37 enum {
  38         FORMAT_DEFAULT   = 0,
  39         FORMAT_LONG      = 1,
  40         FORMAT_SHORT     = 2,
  41         FORMAT_PORCELAIN = 3,
  42 };
  43
  44 #define MAX_PATHSPEC 8
  45
  46 struct opts {
  47     git_status_options statusopt;
  48     char *repodir;
  49     char *pathspec[MAX_PATHSPEC];
  50     int npaths;
  51     int format;
  52     int zterm;
  53     int showbranch;
  54 };
  55
  56 static void parse_opts(struct opts *o, int argc, char *argv[]);
  57 static void show_branch(git_repository *repo, int format);
  58 static void print_long(git_status_list *status);
  59 static void print_short(git_repository *repo, git_status_list *status);
  60
  61 int main(int argc, char *argv[])
  62 {
  63         git_repository *repo = NULL;
  64         git_status_list *status;
  65         struct opts o = { GIT_STATUS_OPTIONS_INIT, "." };
  66
  67         git_threads_init();
  68
  69         o.statusopt.show  = GIT_STATUS_SHOW_INDEX_AND_WORKDIR;
  70         o.statusopt.flags = GIT_STATUS_OPT_INCLUDE_UNTRACKED |
  71                 GIT_STATUS_OPT_RENAMES_HEAD_TO_INDEX |
  72                 GIT_STATUS_OPT_SORT_CASE_SENSITIVELY;
  73
  74         parse_opts(&o, argc, argv);
  75
  76         /**
  77          * Try to open the repository at the given path (or at the current
  78          * directory if none was given).
  79          */
  80         check_lg2(git_repository_open_ext(&repo, o.repodir, 0, NULL),
  81                   "Could not open repository", o.repodir);
  82
  83         if (git_repository_is_bare(repo))
  84                 fatal("Cannot report status on bare repository",
  85                         git_repository_path(repo));
  86
  87         /**
  88          * Run status on the repository
  89          *
  90          * We use `git_status_list_new()` to generate a list of status
  91          * information which lets us iterate over it at our
  92          * convenience and extract the data we want to show out of
  93          * each entry.
  94          *
  95          * You can use `git_status_foreach()` or
  96          * `git_status_foreach_ext()` if you'd prefer to execute a
  97          * callback for each entry. The latter gives you more control
  98          * about what results are presented.
  99          */
 100         check_lg2(git_status_list_new(&status, repo, &o.statusopt),
 101                   "Could not get status", NULL);
 102
 103         if (o.showbranch)
 104                 show_branch(repo, o.format);
 105
 106         if (o.format == FORMAT_LONG)
 107                 print_long(status);
 108         else
 109                 print_short(repo, status);
 110
 111         git_status_list_free(status);
 112         git_repository_free(repo);
 113         git_threads_shutdown();
 114
 115         return 0;
 116 }
 117
 118 /**
 119  * If the user asked for the branch, let's show the short name of the
 120  * branch.
 121  */
 122 static void show_branch(git_repository *repo, int format)
 123 {
 124         int error = 0;
 125         const char *branch = NULL;
 126         git_reference *head = NULL;
 127
 128         error = git_repository_head(&head, repo);
 129
 130         if (error == GIT_EUNBORNBRANCH || error == GIT_ENOTFOUND)
 131                 branch = NULL;
 132         else if (!error) {
 133                 branch = git_reference_shorthand(head);
 134         } else
 135                 check_lg2(error, "failed to get current branch", NULL);
 136
 137         if (format == FORMAT_LONG)
 138                 printf("# On branch %s\n",
 139                         branch ? branch : "Not currently on any branch.");
 140         else
 141                 printf("## %s\n", branch ? branch : "HEAD (no branch)");
 142
 143         git_reference_free(head);
 144 }
 145
 146 /**
 147  * This function print out an output similar to git's status command
 148  * in long form, including the command-line hints.
 149  */
 150 static void print_long(git_status_list *status)
 151 {
 152         size_t i, maxi = git_status_list_entrycount(status);
 153         const git_status_entry *s;
 154         int header = 0, changes_in_index = 0;
 155         int changed_in_workdir = 0, rm_in_workdir = 0;
 156         const char *old_path, *new_path;
 157
 158         /** Print index changes. */
 159
 160         for (i = 0; i < maxi; ++i) {
 161                 char *istatus = NULL;
 162
 163                 s = git_status_byindex(status, i);
 164
 165                 if (s->status == GIT_STATUS_CURRENT)
 166                         continue;
 167
 168                 if (s->status & GIT_STATUS_WT_DELETED)
 169                         rm_in_workdir = 1;
 170
 171                 if (s->status & GIT_STATUS_INDEX_NEW)
 172                         istatus = "new file: ";
 173                 if (s->status & GIT_STATUS_INDEX_MODIFIED)
 174                         istatus = "modified: ";
 175                 if (s->status & GIT_STATUS_INDEX_DELETED)
 176                         istatus = "deleted:  ";
 177                 if (s->status & GIT_STATUS_INDEX_RENAMED)
 178                         istatus = "renamed:  ";
 179                 if (s->status & GIT_STATUS_INDEX_TYPECHANGE)
 180                         istatus = "typechange:";
 181
 182                 if (istatus == NULL)
 183                         continue;
 184
 185                 if (!header) {
 186                         printf("# Changes to be committed:\n");
 187                         printf("#   (use \"git reset HEAD <file>...\" to unstage)\n");
 188                         printf("#\n");
 189                         header = 1;
 190                 }
 191
 192                 old_path = s->head_to_index->old_file.path;
 193                 new_path = s->head_to_index->new_file.path;
 194
 195                 if (old_path && new_path && strcmp(old_path, new_path))
 196                         printf("#\t%s  %s -> %s\n", istatus, old_path, new_path);
 197                 else
 198                         printf("#\t%s  %s\n", istatus, old_path ? old_path : new_path);
 199         }
 200
 201         if (header) {
 202                 changes_in_index = 1;
 203                 printf("#\n");
 204         }
 205         header = 0;
 206
 207         /** Print workdir changes to tracked files. */
 208
 209         for (i = 0; i < maxi; ++i) {
 210                 char *wstatus = NULL;
 211
 212                 s = git_status_byindex(status, i);
 213
 214                 /**
 215                  * With `GIT_STATUS_OPT_INCLUDE_UNMODIFIED` (not used in this example)
 216                  * `index_to_workdir` may not be `NULL` even if there are
 217                  * no differences, in which case it will be a `GIT_DELTA_UNMODIFIED`.
 218                  */
 219                 if (s->status == GIT_STATUS_CURRENT || s->index_to_workdir == NULL)
 220                         continue;
 221
 222                 /** Print out the output since we know the file has some changes */
 223                 if (s->status & GIT_STATUS_WT_MODIFIED)
 224                         wstatus = "modified: ";
 225                 if (s->status & GIT_STATUS_WT_DELETED)
 226                         wstatus = "deleted:  ";
 227                 if (s->status & GIT_STATUS_WT_RENAMED)
 228                         wstatus = "renamed:  ";
 229                 if (s->status & GIT_STATUS_WT_TYPECHANGE)
 230                         wstatus = "typechange:";
 231
 232                 if (wstatus == NULL)
 233                         continue;
 234
 235                 if (!header) {
 236                         printf("# Changes not staged for commit:\n");
 237                         printf("#   (use \"git add%s <file>...\" to update what will be committed)\n", rm_in_workdir ? "/rm" : "");
 238                         printf("#   (use \"git checkout -- <file>...\" to discard changes in working directory)\n");
 239                         printf("#\n");
 240                         header = 1;
 241                 }
 242
 243                 old_path = s->index_to_workdir->old_file.path;
 244                 new_path = s->index_to_workdir->new_file.path;
 245
 246                 if (old_path && new_path && strcmp(old_path, new_path))
 247                         printf("#\t%s  %s -> %s\n", wstatus, old_path, new_path);
 248                 else
 249                         printf("#\t%s  %s\n", wstatus, old_path ? old_path : new_path);
 250         }
 251
 252         if (header) {
 253                 changed_in_workdir = 1;
 254                 printf("#\n");
 255         }
 256
 257         /** Print untracked files. */
 258
 259         header = 0;
 260
 261         for (i = 0; i < maxi; ++i) {
 262                 s = git_status_byindex(status, i);
 263
 264                 if (s->status == GIT_STATUS_WT_NEW) {
 265
 266                         if (!header) {
 267                                 printf("# Untracked files:\n");
 268                                 printf("#   (use \"git add <file>...\" to include in what will be committed)\n");
 269                                 printf("#\n");
 270                                 header = 1;
 271                         }
 272
 273                         printf("#\t%s\n", s->index_to_workdir->old_file.path);
 274                 }
 275         }
 276
 277         header = 0;
 278
 279         /** Print ignored files. */
 280
 281         for (i = 0; i < maxi; ++i) {
 282                 s = git_status_byindex(status, i);
 283
 284                 if (s->status == GIT_STATUS_IGNORED) {
 285
 286                         if (!header) {
 287                                 printf("# Ignored files:\n");
 288                                 printf("#   (use \"git add -f <file>...\" to include in what will be committed)\n");
 289                                 printf("#\n");
 290                                 header = 1;
 291                         }
 292
 293                         printf("#\t%s\n", s->index_to_workdir->old_file.path);
 294                 }
 295         }
 296
 297         if (!changes_in_index && changed_in_workdir)
 298                 printf("no changes added to commit (use \"git add\" and/or \"git commit -a\")\n");
 299 }
 300
 301 /**
 302  * This version of the output prefixes each path with two status
 303  * columns and shows submodule status information.
 304  */
 305 static void print_short(git_repository *repo, git_status_list *status)
 306 {
 307         size_t i, maxi = git_status_list_entrycount(status);
 308         const git_status_entry *s;
 309         char istatus, wstatus;
 310         const char *extra, *a, *b, *c;
 311
 312         for (i = 0; i < maxi; ++i) {
 313                 s = git_status_byindex(status, i);
 314
 315                 if (s->status == GIT_STATUS_CURRENT)
 316                         continue;
 317
 318                 a = b = c = NULL;
 319                 istatus = wstatus = ' ';
 320                 extra = "";
 321
 322                 if (s->status & GIT_STATUS_INDEX_NEW)
 323                         istatus = 'A';
 324                 if (s->status & GIT_STATUS_INDEX_MODIFIED)
 325                         istatus = 'M';
 326                 if (s->status & GIT_STATUS_INDEX_DELETED)
 327                         istatus = 'D';
 328                 if (s->status & GIT_STATUS_INDEX_RENAMED)
 329                         istatus = 'R';
 330                 if (s->status & GIT_STATUS_INDEX_TYPECHANGE)
 331                         istatus = 'T';
 332
 333                 if (s->status & GIT_STATUS_WT_NEW) {
 334                         if (istatus == ' ')
 335                                 istatus = '?';
 336                         wstatus = '?';
 337                 }
 338                 if (s->status & GIT_STATUS_WT_MODIFIED)
 339                         wstatus = 'M';
 340                 if (s->status & GIT_STATUS_WT_DELETED)
 341                         wstatus = 'D';
 342                 if (s->status & GIT_STATUS_WT_RENAMED)
 343                         wstatus = 'R';
 344                 if (s->status & GIT_STATUS_WT_TYPECHANGE)
 345                         wstatus = 'T';
 346
 347                 if (s->status & GIT_STATUS_IGNORED) {
 348                         istatus = '!';
 349                         wstatus = '!';
 350                 }
 351
 352                 if (istatus == '?' && wstatus == '?')
 353                         continue;
 354
 355                 /**
 356                  * A commit in a tree is how submodules are stored, so
 357                  * let's go take a look at its status.
 358                  */
 359                 if (s->index_to_workdir &&
 360                         s->index_to_workdir->new_file.mode == GIT_FILEMODE_COMMIT)
 361                 {
 362                         git_submodule *sm = NULL;
 363                         unsigned int smstatus = 0;
 364
 365                         if (!git_submodule_lookup(
 366                                         &sm, repo, s->index_to_workdir->new_file.path) &&
 367                                 !git_submodule_status(&smstatus, sm))
 368                         {
 369                                 if (smstatus & GIT_SUBMODULE_STATUS_WD_MODIFIED)
 370                                         extra = " (new commits)";
 371                                 else if (smstatus & GIT_SUBMODULE_STATUS_WD_INDEX_MODIFIED)
 372                                         extra = " (modified content)";
 373                                 else if (smstatus & GIT_SUBMODULE_STATUS_WD_WD_MODIFIED)
 374                                         extra = " (modified content)";
 375                                 else if (smstatus & GIT_SUBMODULE_STATUS_WD_UNTRACKED)
 376                                         extra = " (untracked content)";
 377                         }
 378                 }
 379
 380                 /**
 381                  * Now that we have all the information, it's time to format the output.
 382                  */
 383
 384                 if (s->head_to_index) {
 385                         a = s->head_to_index->old_file.path;
 386                         b = s->head_to_index->new_file.path;
 387                 }
 388                 if (s->index_to_workdir) {
 389                         if (!a)
 390                                 a = s->index_to_workdir->old_file.path;
 391                         if (!b)
 392                                 b = s->index_to_workdir->old_file.path;
 393                         c = s->index_to_workdir->new_file.path;
 394                 }
 395
 396                 if (istatus == 'R') {
 397                         if (wstatus == 'R')
 398                                 printf("%c%c %s %s %s%s\n", istatus, wstatus, a, b, c, extra);
 399                         else
 400                                 printf("%c%c %s %s%s\n", istatus, wstatus, a, b, extra);
 401                 } else {
 402                         if (wstatus == 'R')
 403                                 printf("%c%c %s %s%s\n", istatus, wstatus, a, c, extra);
 404                         else
 405                                 printf("%c%c %s%s\n", istatus, wstatus, a, extra);
 406                 }
 407         }
 408
 409         for (i = 0; i < maxi; ++i) {
 410                 s = git_status_byindex(status, i);
 411
 412                 if (s->status == GIT_STATUS_WT_NEW)
 413                         printf("?? %s\n", s->index_to_workdir->old_file.path);
 414         }
 415 }
 416
 417 /**
 418  * Parse options that git's status command supports.
 419  */
 420 static void parse_opts(struct opts *o, int argc, char *argv[])
 421 {
 422         struct args_info args = ARGS_INFO_INIT;
 423
 424         for (args.pos = 1; args.pos < argc; ++args.pos) {
 425                 char *a = argv[args.pos];
 426
 427                 if (a[0] != '-') {
 428                         if (o->npaths < MAX_PATHSPEC)
 429                                 o->pathspec[o->npaths++] = a;
 430                         else
 431                                 fatal("Example only supports a limited pathspec", NULL);
 432                 }
 433                 else if (!strcmp(a, "-s") || !strcmp(a, "--short"))
 434                         o->format = FORMAT_SHORT;
 435                 else if (!strcmp(a, "--long"))
 436                         o->format = FORMAT_LONG;
 437                 else if (!strcmp(a, "--porcelain"))
 438                         o->format = FORMAT_PORCELAIN;
 439                 else if (!strcmp(a, "-b") || !strcmp(a, "--branch"))
 440                         o->showbranch = 1;
 441                 else if (!strcmp(a, "-z")) {
 442                         o->zterm = 1;
 443                         if (o->format == FORMAT_DEFAULT)
 444                                 o->format = FORMAT_PORCELAIN;
 445                 }
 446                 else if (!strcmp(a, "--ignored"))
 447                         o->statusopt.flags |= GIT_STATUS_OPT_INCLUDE_IGNORED;
 448                 else if (!strcmp(a, "-uno") ||
 449                                  !strcmp(a, "--untracked-files=no"))
 450                         o->statusopt.flags &= ~GIT_STATUS_OPT_INCLUDE_UNTRACKED;
 451                 else if (!strcmp(a, "-unormal") ||
 452                                  !strcmp(a, "--untracked-files=normal"))
 453                         o->statusopt.flags |= GIT_STATUS_OPT_INCLUDE_UNTRACKED;
 454                 else if (!strcmp(a, "-uall") ||
 455                                  !strcmp(a, "--untracked-files=all"))
 456                         o->statusopt.flags |= GIT_STATUS_OPT_INCLUDE_UNTRACKED |
 457                                 GIT_STATUS_OPT_RECURSE_UNTRACKED_DIRS;
 458                 else if (!strcmp(a, "--ignore-submodules=all"))
 459                         o->statusopt.flags |= GIT_STATUS_OPT_EXCLUDE_SUBMODULES;
 460                 else if (!strncmp(a, "--git-dir=", strlen("--git-dir=")))
 461                         o->repodir = a + strlen("--git-dir=");
 462                 else
 463                         check_lg2(-1, "Unsupported option", a);
 464         }
 465
 466         if (o->format == FORMAT_DEFAULT)
 467                 o->format = FORMAT_LONG;
 468         if (o->format == FORMAT_LONG)
 469                 o->showbranch = 1;
 470         if (o->npaths > 0) {
 471                 o->statusopt.pathspec.strings = o->pathspec;
 472                 o->statusopt.pathspec.count   = o->npaths;
 473         }
 474 }