read-cache.c: use xcalloc() not calloc()
[git/git.git] / git.c
1 #include <stdio.h>
2 #include <sys/types.h>
3 #include <sys/stat.h>
4 #include <dirent.h>
5 #include <unistd.h>
6 #include <stdlib.h>
7 #include <string.h>
8 #include <errno.h>
9 #include <limits.h>
10 #include <stdarg.h>
11 #include <sys/ioctl.h>
12 #include "git-compat-util.h"
13 #include "exec_cmd.h"
14 #include "common-cmds.h"
15
16 #include "cache.h"
17 #include "commit.h"
18 #include "diff.h"
19 #include "revision.h"
20 #include "log-tree.h"
21
22 #ifndef PATH_MAX
23 # define PATH_MAX 4096
24 #endif
25
26 static const char git_usage[] =
27 "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
28
29 /* most gui terms set COLUMNS (although some don't export it) */
30 static int term_columns(void)
31 {
32 char *col_string = getenv("COLUMNS");
33 int n_cols = 0;
34
35 if (col_string && (n_cols = atoi(col_string)) > 0)
36 return n_cols;
37
38 #ifdef TIOCGWINSZ
39 {
40 struct winsize ws;
41 if (!ioctl(1, TIOCGWINSZ, &ws)) {
42 if (ws.ws_col)
43 return ws.ws_col;
44 }
45 }
46 #endif
47
48 return 80;
49 }
50
51 static void oom(void)
52 {
53 fprintf(stderr, "git: out of memory\n");
54 exit(1);
55 }
56
57 static inline void mput_char(char c, unsigned int num)
58 {
59 while(num--)
60 putchar(c);
61 }
62
63 static struct cmdname {
64 size_t len;
65 char name[1];
66 } **cmdname;
67 static int cmdname_alloc, cmdname_cnt;
68
69 static void add_cmdname(const char *name, int len)
70 {
71 struct cmdname *ent;
72 if (cmdname_alloc <= cmdname_cnt) {
73 cmdname_alloc = cmdname_alloc + 200;
74 cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
75 if (!cmdname)
76 oom();
77 }
78 ent = malloc(sizeof(*ent) + len);
79 if (!ent)
80 oom();
81 ent->len = len;
82 memcpy(ent->name, name, len);
83 ent->name[len] = 0;
84 cmdname[cmdname_cnt++] = ent;
85 }
86
87 static int cmdname_compare(const void *a_, const void *b_)
88 {
89 struct cmdname *a = *(struct cmdname **)a_;
90 struct cmdname *b = *(struct cmdname **)b_;
91 return strcmp(a->name, b->name);
92 }
93
94 static void pretty_print_string_list(struct cmdname **cmdname, int longest)
95 {
96 int cols = 1, rows;
97 int space = longest + 1; /* min 1 SP between words */
98 int max_cols = term_columns() - 1; /* don't print *on* the edge */
99 int i, j;
100
101 if (space < max_cols)
102 cols = max_cols / space;
103 rows = (cmdname_cnt + cols - 1) / cols;
104
105 qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
106
107 for (i = 0; i < rows; i++) {
108 printf(" ");
109
110 for (j = 0; j < cols; j++) {
111 int n = j * rows + i;
112 int size = space;
113 if (n >= cmdname_cnt)
114 break;
115 if (j == cols-1 || n + rows >= cmdname_cnt)
116 size = 1;
117 printf("%-*s", size, cmdname[n]->name);
118 }
119 putchar('\n');
120 }
121 }
122
123 static void list_commands(const char *exec_path, const char *pattern)
124 {
125 unsigned int longest = 0;
126 char path[PATH_MAX];
127 int dirlen;
128 DIR *dir = opendir(exec_path);
129 struct dirent *de;
130
131 if (!dir) {
132 fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
133 exit(1);
134 }
135
136 dirlen = strlen(exec_path);
137 if (PATH_MAX - 20 < dirlen) {
138 fprintf(stderr, "git: insanely long exec-path '%s'\n",
139 exec_path);
140 exit(1);
141 }
142
143 memcpy(path, exec_path, dirlen);
144 path[dirlen++] = '/';
145
146 while ((de = readdir(dir)) != NULL) {
147 struct stat st;
148 int entlen;
149
150 if (strncmp(de->d_name, "git-", 4))
151 continue;
152 strcpy(path+dirlen, de->d_name);
153 if (stat(path, &st) || /* stat, not lstat */
154 !S_ISREG(st.st_mode) ||
155 !(st.st_mode & S_IXUSR))
156 continue;
157
158 entlen = strlen(de->d_name);
159 if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
160 entlen -= 4;
161
162 if (longest < entlen)
163 longest = entlen;
164
165 add_cmdname(de->d_name + 4, entlen-4);
166 }
167 closedir(dir);
168
169 printf("git commands available in '%s'\n", exec_path);
170 printf("----------------------------");
171 mput_char('-', strlen(exec_path));
172 putchar('\n');
173 pretty_print_string_list(cmdname, longest - 4);
174 putchar('\n');
175 }
176
177 static void list_common_cmds_help(void)
178 {
179 int i, longest = 0;
180
181 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
182 if (longest < strlen(common_cmds[i].name))
183 longest = strlen(common_cmds[i].name);
184 }
185
186 puts("The most commonly used git commands are:");
187 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
188 printf(" %s", common_cmds[i].name);
189 mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
190 puts(common_cmds[i].help);
191 }
192 puts("(use 'git help -a' to get a list of all installed git commands)");
193 }
194
195 #ifdef __GNUC__
196 static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
197 __attribute__((__format__(__printf__, 3, 4), __noreturn__));
198 #endif
199 static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
200 {
201 if (fmt) {
202 va_list ap;
203
204 va_start(ap, fmt);
205 printf("git: ");
206 vprintf(fmt, ap);
207 va_end(ap);
208 putchar('\n');
209 }
210 else
211 puts(git_usage);
212
213 if (exec_path) {
214 putchar('\n');
215 if (show_all)
216 list_commands(exec_path, "git-*");
217 else
218 list_common_cmds_help();
219 }
220
221 exit(1);
222 }
223
224 static void prepend_to_path(const char *dir, int len)
225 {
226 char *path, *old_path = getenv("PATH");
227 int path_len = len;
228
229 if (!old_path)
230 old_path = "/usr/local/bin:/usr/bin:/bin";
231
232 path_len = len + strlen(old_path) + 1;
233
234 path = malloc(path_len + 1);
235
236 memcpy(path, dir, len);
237 path[len] = ':';
238 memcpy(path + len + 1, old_path, path_len - len);
239
240 setenv("PATH", path, 1);
241 }
242
243 static void show_man_page(const char *git_cmd)
244 {
245 const char *page;
246
247 if (!strncmp(git_cmd, "git", 3))
248 page = git_cmd;
249 else {
250 int page_len = strlen(git_cmd) + 4;
251 char *p = malloc(page_len + 1);
252 strcpy(p, "git-");
253 strcpy(p + 4, git_cmd);
254 p[page_len] = 0;
255 page = p;
256 }
257
258 execlp("man", "man", page, NULL);
259 }
260
261 static int cmd_version(int argc, const char **argv, char **envp)
262 {
263 printf("git version %s\n", GIT_VERSION);
264 return 0;
265 }
266
267 static int cmd_help(int argc, const char **argv, char **envp)
268 {
269 const char *help_cmd = argv[1];
270 if (!help_cmd)
271 cmd_usage(0, git_exec_path(), NULL);
272 else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
273 cmd_usage(1, git_exec_path(), NULL);
274 else
275 show_man_page(help_cmd);
276 return 0;
277 }
278
279 #define LOGSIZE (65536)
280
281 static int cmd_log(int argc, const char **argv, char **envp)
282 {
283 struct rev_info rev;
284 struct commit *commit;
285 char *buf = xmalloc(LOGSIZE);
286 static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
287 int abbrev = DEFAULT_ABBREV;
288 int abbrev_commit = 0;
289 const char *commit_prefix = "commit ";
290 struct log_tree_opt opt;
291 int shown = 0;
292 int do_diff = 0;
293 int full_diff = 0;
294
295 init_log_tree_opt(&opt);
296 argc = setup_revisions(argc, argv, &rev, "HEAD");
297 while (1 < argc) {
298 const char *arg = argv[1];
299 if (!strncmp(arg, "--pretty", 8)) {
300 commit_format = get_commit_format(arg + 8);
301 if (commit_format == CMIT_FMT_ONELINE)
302 commit_prefix = "";
303 }
304 else if (!strcmp(arg, "--no-abbrev")) {
305 abbrev = 0;
306 }
307 else if (!strcmp(arg, "--abbrev")) {
308 abbrev = DEFAULT_ABBREV;
309 }
310 else if (!strcmp(arg, "--abbrev-commit")) {
311 abbrev_commit = 1;
312 }
313 else if (!strncmp(arg, "--abbrev=", 9)) {
314 abbrev = strtoul(arg + 9, NULL, 10);
315 if (abbrev && abbrev < MINIMUM_ABBREV)
316 abbrev = MINIMUM_ABBREV;
317 else if (40 < abbrev)
318 abbrev = 40;
319 }
320 else if (!strcmp(arg, "--full-diff")) {
321 do_diff = 1;
322 full_diff = 1;
323 }
324 else {
325 int cnt = log_tree_opt_parse(&opt, argv+1, argc-1);
326 if (0 < cnt) {
327 do_diff = 1;
328 argv += cnt;
329 argc -= cnt;
330 continue;
331 }
332 die("unrecognized argument: %s", arg);
333 }
334
335 argc--; argv++;
336 }
337
338 if (do_diff) {
339 opt.diffopt.abbrev = abbrev;
340 opt.verbose_header = 0;
341 opt.always_show_header = 0;
342 opt.no_commit_id = 1;
343 if (opt.combine_merges)
344 opt.ignore_merges = 0;
345 if (opt.dense_combined_merges)
346 opt.diffopt.output_format = DIFF_FORMAT_PATCH;
347 if (!full_diff && rev.prune_data)
348 diff_tree_setup_paths(rev.prune_data, &opt.diffopt);
349 diff_setup_done(&opt.diffopt);
350 }
351
352 prepare_revision_walk(&rev);
353 setup_pager();
354 while ((commit = get_revision(&rev)) != NULL) {
355 if (shown && do_diff && commit_format != CMIT_FMT_ONELINE)
356 putchar('\n');
357 fputs(commit_prefix, stdout);
358 if (abbrev_commit && abbrev)
359 fputs(find_unique_abbrev(commit->object.sha1, abbrev),
360 stdout);
361 else
362 fputs(sha1_to_hex(commit->object.sha1), stdout);
363 if (rev.parents) {
364 struct commit_list *parents = commit->parents;
365 while (parents) {
366 struct object *o = &(parents->item->object);
367 parents = parents->next;
368 if (o->flags & TMP_MARK)
369 continue;
370 printf(" %s", sha1_to_hex(o->sha1));
371 o->flags |= TMP_MARK;
372 }
373 /* TMP_MARK is a general purpose flag that can
374 * be used locally, but the user should clean
375 * things up after it is done with them.
376 */
377 for (parents = commit->parents;
378 parents;
379 parents = parents->next)
380 parents->item->object.flags &= ~TMP_MARK;
381 }
382 if (commit_format == CMIT_FMT_ONELINE)
383 putchar(' ');
384 else
385 putchar('\n');
386 pretty_print_commit(commit_format, commit, ~0, buf,
387 LOGSIZE, abbrev);
388 printf("%s\n", buf);
389 if (do_diff) {
390 printf("---\n");
391 log_tree_commit(&opt, commit);
392 }
393 shown = 1;
394 free(commit->buffer);
395 commit->buffer = NULL;
396 }
397 free(buf);
398 return 0;
399 }
400
401 static void handle_internal_command(int argc, const char **argv, char **envp)
402 {
403 const char *cmd = argv[0];
404 static struct cmd_struct {
405 const char *cmd;
406 int (*fn)(int, const char **, char **);
407 } commands[] = {
408 { "version", cmd_version },
409 { "help", cmd_help },
410 { "log", cmd_log },
411 };
412 int i;
413
414 /* Turn "git cmd --help" into "git help cmd" */
415 if (argc > 1 && !strcmp(argv[1], "--help")) {
416 argv[1] = argv[0];
417 argv[0] = cmd = "help";
418 }
419
420 for (i = 0; i < ARRAY_SIZE(commands); i++) {
421 struct cmd_struct *p = commands+i;
422 if (strcmp(p->cmd, cmd))
423 continue;
424 exit(p->fn(argc, argv, envp));
425 }
426 }
427
428 int main(int argc, const char **argv, char **envp)
429 {
430 const char *cmd = argv[0];
431 char *slash = strrchr(cmd, '/');
432 char git_command[PATH_MAX + 1];
433 const char *exec_path = NULL;
434
435 /*
436 * Take the basename of argv[0] as the command
437 * name, and the dirname as the default exec_path
438 * if it's an absolute path and we don't have
439 * anything better.
440 */
441 if (slash) {
442 *slash++ = 0;
443 if (*cmd == '/')
444 exec_path = cmd;
445 cmd = slash;
446 }
447
448 /*
449 * "git-xxxx" is the same as "git xxxx", but we obviously:
450 *
451 * - cannot take flags in between the "git" and the "xxxx".
452 * - cannot execute it externally (since it would just do
453 * the same thing over again)
454 *
455 * So we just directly call the internal command handler, and
456 * die if that one cannot handle it.
457 */
458 if (!strncmp(cmd, "git-", 4)) {
459 cmd += 4;
460 argv[0] = cmd;
461 handle_internal_command(argc, argv, envp);
462 die("cannot handle %s internally", cmd);
463 }
464
465 /* Default command: "help" */
466 cmd = "help";
467
468 /* Look for flags.. */
469 while (argc > 1) {
470 cmd = *++argv;
471 argc--;
472
473 if (strncmp(cmd, "--", 2))
474 break;
475
476 cmd += 2;
477
478 /*
479 * For legacy reasons, the "version" and "help"
480 * commands can be written with "--" prepended
481 * to make them look like flags.
482 */
483 if (!strcmp(cmd, "help"))
484 break;
485 if (!strcmp(cmd, "version"))
486 break;
487
488 /*
489 * Check remaining flags (which by now must be
490 * "--exec-path", but maybe we will accept
491 * other arguments some day)
492 */
493 if (!strncmp(cmd, "exec-path", 9)) {
494 cmd += 9;
495 if (*cmd == '=') {
496 git_set_exec_path(cmd + 1);
497 continue;
498 }
499 puts(git_exec_path());
500 exit(0);
501 }
502 cmd_usage(0, NULL, NULL);
503 }
504 argv[0] = cmd;
505
506 /*
507 * We search for git commands in the following order:
508 * - git_exec_path()
509 * - the path of the "git" command if we could find it
510 * in $0
511 * - the regular PATH.
512 */
513 if (exec_path)
514 prepend_to_path(exec_path, strlen(exec_path));
515 exec_path = git_exec_path();
516 prepend_to_path(exec_path, strlen(exec_path));
517
518 /* See if it's an internal command */
519 handle_internal_command(argc, argv, envp);
520
521 /* .. then try the external ones */
522 execv_git_cmd(argv);
523
524 if (errno == ENOENT)
525 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
526
527 fprintf(stderr, "Failed to run command '%s': %s\n",
528 git_command, strerror(errno));
529
530 return 1;
531 }