diff --stat: do not do its own three-dashes.
[git/git.git] / git.c
CommitLineData
8e49d503 1#include <stdio.h>
7dbc2c04
JH
2#include <sys/types.h>
3#include <sys/stat.h>
4#include <dirent.h>
8e49d503
AE
5#include <unistd.h>
6#include <stdlib.h>
7#include <string.h>
8#include <errno.h>
9#include <limits.h>
10#include <stdarg.h>
ea77e675 11#include <sys/ioctl.h>
4050c0df 12#include "git-compat-util.h"
77cb17e9 13#include "exec_cmd.h"
a87cd02c 14#include "common-cmds.h"
8e49d503 15
70b006b9
LT
16#include "cache.h"
17#include "commit.h"
52b70d56 18#include "diff.h"
c4e05b1a 19#include "revision.h"
52b70d56 20#include "log-tree.h"
70b006b9 21
8e49d503
AE
22#ifndef PATH_MAX
23# define PATH_MAX 4096
24#endif
25
26static const char git_usage[] =
27 "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
28
8e49d503
AE
29/* most gui terms set COLUMNS (although some don't export it) */
30static 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
ea77e675
LT
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
8e49d503
AE
48 return 80;
49}
50
7dbc2c04
JH
51static void oom(void)
52{
53 fprintf(stderr, "git: out of memory\n");
54 exit(1);
55}
56
8e49d503
AE
57static inline void mput_char(char c, unsigned int num)
58{
59 while(num--)
60 putchar(c);
61}
62
7dbc2c04
JH
63static struct cmdname {
64 size_t len;
65 char name[1];
66} **cmdname;
67static int cmdname_alloc, cmdname_cnt;
68
69static 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;
f9039f30
JH
82 memcpy(ent->name, name, len);
83 ent->name[len] = 0;
7dbc2c04
JH
84 cmdname[cmdname_cnt++] = ent;
85}
86
87static 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
94static void pretty_print_string_list(struct cmdname **cmdname, int longest)
8e49d503 95{
112d0baf 96 int cols = 1, rows;
8e49d503
AE
97 int space = longest + 1; /* min 1 SP between words */
98 int max_cols = term_columns() - 1; /* don't print *on* the edge */
112d0baf 99 int i, j;
8e49d503
AE
100
101 if (space < max_cols)
102 cols = max_cols / space;
112d0baf 103 rows = (cmdname_cnt + cols - 1) / cols;
8e49d503 104
7dbc2c04
JH
105 qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
106
112d0baf 107 for (i = 0; i < rows; i++) {
8e49d503
AE
108 printf(" ");
109
112d0baf
LT
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);
8e49d503
AE
118 }
119 putchar('\n');
120 }
121}
122
123static void list_commands(const char *exec_path, const char *pattern)
124{
7dbc2c04
JH
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));
8e49d503
AE
133 exit(1);
134 }
135
7dbc2c04
JH
136 dirlen = strlen(exec_path);
137 if (PATH_MAX - 20 < dirlen) {
138 fprintf(stderr, "git: insanely long exec-path '%s'\n",
139 exec_path);
8e49d503
AE
140 exit(1);
141 }
142
7dbc2c04
JH
143 memcpy(path, exec_path, dirlen);
144 path[dirlen++] = '/';
145
146 while ((de = readdir(dir)) != NULL) {
147 struct stat st;
148 int entlen;
8e49d503 149
7dbc2c04
JH
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))
8e49d503
AE
156 continue;
157
7dbc2c04 158 entlen = strlen(de->d_name);
f9039f30
JH
159 if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
160 entlen -= 4;
8e49d503 161
7dbc2c04
JH
162 if (longest < entlen)
163 longest = entlen;
164
165 add_cmdname(de->d_name + 4, entlen-4);
8e49d503 166 }
7dbc2c04 167 closedir(dir);
8e49d503
AE
168
169 printf("git commands available in '%s'\n", exec_path);
170 printf("----------------------------");
171 mput_char('-', strlen(exec_path));
172 putchar('\n');
7dbc2c04 173 pretty_print_string_list(cmdname, longest - 4);
8e49d503
AE
174 putchar('\n');
175}
176
ec26b4d6 177static void list_common_cmds_help(void)
a87cd02c
FK
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
8e49d503 195#ifdef __GNUC__
a87cd02c
FK
196static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
197 __attribute__((__format__(__printf__, 3, 4), __noreturn__));
8e49d503 198#endif
a87cd02c 199static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
8e49d503
AE
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
a87cd02c
FK
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 }
8e49d503
AE
220
221 exit(1);
222}
223
224static 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)
7dbc2c04 230 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
231
232 path_len = len + strlen(old_path) + 1;
233
234 path = malloc(path_len + 1);
8e49d503
AE
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
9201c707 243static void show_man_page(const char *git_cmd)
97fc6c5f 244{
9201c707 245 const char *page;
97fc6c5f
AE
246
247 if (!strncmp(git_cmd, "git", 3))
248 page = git_cmd;
249 else {
250 int page_len = strlen(git_cmd) + 4;
9201c707
JH
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;
97fc6c5f
AE
256 }
257
7dbc2c04 258 execlp("man", "man", page, NULL);
97fc6c5f
AE
259}
260
9201c707 261static int cmd_version(int argc, const char **argv, char **envp)
231af832
LT
262{
263 printf("git version %s\n", GIT_VERSION);
264 return 0;
265}
266
9201c707 267static int cmd_help(int argc, const char **argv, char **envp)
231af832 268{
9201c707 269 const char *help_cmd = argv[1];
231af832 270 if (!help_cmd)
a87cd02c
FK
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);
231af832
LT
276 return 0;
277}
278
70b006b9
LT
279#define LOGSIZE (65536)
280
9201c707 281static int cmd_log(int argc, const char **argv, char **envp)
70b006b9
LT
282{
283 struct rev_info rev;
284 struct commit *commit;
285 char *buf = xmalloc(LOGSIZE);
7ae0b0cb
JH
286 static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
287 int abbrev = DEFAULT_ABBREV;
f0853837 288 int abbrev_commit = 0;
7ae0b0cb 289 const char *commit_prefix = "commit ";
52b70d56 290 struct log_tree_opt opt;
477f2b41 291 int shown = 0;
52b70d56 292 int do_diff = 0;
477f2b41 293 int full_diff = 0;
70b006b9 294
52b70d56 295 init_log_tree_opt(&opt);
70b006b9 296 argc = setup_revisions(argc, argv, &rev, "HEAD");
7ae0b0cb 297 while (1 < argc) {
9201c707 298 const char *arg = argv[1];
64bc6e3d 299 if (!strncmp(arg, "--pretty", 8)) {
7ae0b0cb
JH
300 commit_format = get_commit_format(arg + 8);
301 if (commit_format == CMIT_FMT_ONELINE)
302 commit_prefix = "";
303 }
7ae0b0cb
JH
304 else if (!strcmp(arg, "--no-abbrev")) {
305 abbrev = 0;
306 }
f0853837
JH
307 else if (!strcmp(arg, "--abbrev")) {
308 abbrev = DEFAULT_ABBREV;
309 }
310 else if (!strcmp(arg, "--abbrev-commit")) {
311 abbrev_commit = 1;
312 }
7ae0b0cb
JH
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 }
477f2b41
JH
320 else if (!strcmp(arg, "--full-diff")) {
321 do_diff = 1;
322 full_diff = 1;
323 }
52b70d56
JH
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 }
7ae0b0cb 332 die("unrecognized argument: %s", arg);
52b70d56
JH
333 }
334
7ae0b0cb
JH
335 argc--; argv++;
336 }
477f2b41 337
52b70d56
JH
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 (opt.diffopt.output_format == DIFF_FORMAT_PATCH)
348 opt.diffopt.recursive = 1;
477f2b41
JH
349 if (!full_diff && rev.prune_data)
350 diff_tree_setup_paths(rev.prune_data, &opt.diffopt);
52b70d56
JH
351 diff_setup_done(&opt.diffopt);
352 }
7ae0b0cb 353
70b006b9
LT
354 prepare_revision_walk(&rev);
355 setup_pager();
356 while ((commit = get_revision(&rev)) != NULL) {
d5335242 357 if (shown && do_diff && commit_format != CMIT_FMT_ONELINE)
477f2b41 358 putchar('\n');
f0853837
JH
359 fputs(commit_prefix, stdout);
360 if (abbrev_commit && abbrev)
361 fputs(find_unique_abbrev(commit->object.sha1, abbrev),
362 stdout);
363 else
364 fputs(sha1_to_hex(commit->object.sha1), stdout);
7b0c9966 365 if (rev.parents) {
7ae0b0cb
JH
366 struct commit_list *parents = commit->parents;
367 while (parents) {
368 struct object *o = &(parents->item->object);
369 parents = parents->next;
370 if (o->flags & TMP_MARK)
371 continue;
372 printf(" %s", sha1_to_hex(o->sha1));
373 o->flags |= TMP_MARK;
374 }
375 /* TMP_MARK is a general purpose flag that can
376 * be used locally, but the user should clean
377 * things up after it is done with them.
378 */
379 for (parents = commit->parents;
380 parents;
381 parents = parents->next)
382 parents->item->object.flags &= ~TMP_MARK;
383 }
384 if (commit_format == CMIT_FMT_ONELINE)
385 putchar(' ');
386 else
387 putchar('\n');
388 pretty_print_commit(commit_format, commit, ~0, buf,
389 LOGSIZE, abbrev);
70b006b9 390 printf("%s\n", buf);
6f4780f9
JH
391 if (do_diff) {
392 printf("---\n");
52b70d56 393 log_tree_commit(&opt, commit);
6f4780f9 394 }
477f2b41 395 shown = 1;
f43ba60e
LT
396 free(commit->buffer);
397 commit->buffer = NULL;
70b006b9
LT
398 }
399 free(buf);
400 return 0;
401}
402
9201c707 403static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
404{
405 const char *cmd = argv[0];
406 static struct cmd_struct {
407 const char *cmd;
9201c707 408 int (*fn)(int, const char **, char **);
231af832
LT
409 } commands[] = {
410 { "version", cmd_version },
411 { "help", cmd_help },
70b006b9 412 { "log", cmd_log },
231af832
LT
413 };
414 int i;
415
416 for (i = 0; i < ARRAY_SIZE(commands); i++) {
417 struct cmd_struct *p = commands+i;
418 if (strcmp(p->cmd, cmd))
419 continue;
420 exit(p->fn(argc, argv, envp));
421 }
422}
423
9201c707 424int main(int argc, const char **argv, char **envp)
8e49d503 425{
9201c707 426 const char *cmd = argv[0];
231af832 427 char *slash = strrchr(cmd, '/');
8e49d503 428 char git_command[PATH_MAX + 1];
231af832
LT
429 const char *exec_path = NULL;
430
431 /*
432 * Take the basename of argv[0] as the command
433 * name, and the dirname as the default exec_path
434 * if it's an absolute path and we don't have
435 * anything better.
436 */
437 if (slash) {
438 *slash++ = 0;
439 if (*cmd == '/')
440 exec_path = cmd;
441 cmd = slash;
442 }
8e49d503 443
231af832
LT
444 /*
445 * "git-xxxx" is the same as "git xxxx", but we obviously:
446 *
447 * - cannot take flags in between the "git" and the "xxxx".
448 * - cannot execute it externally (since it would just do
449 * the same thing over again)
450 *
451 * So we just directly call the internal command handler, and
452 * die if that one cannot handle it.
453 */
454 if (!strncmp(cmd, "git-", 4)) {
455 cmd += 4;
456 argv[0] = cmd;
457 handle_internal_command(argc, argv, envp);
458 die("cannot handle %s internally", cmd);
459 }
8e49d503 460
231af832
LT
461 /* Default command: "help" */
462 cmd = "help";
8e49d503 463
231af832
LT
464 /* Look for flags.. */
465 while (argc > 1) {
466 cmd = *++argv;
467 argc--;
da6bf70e 468
231af832 469 if (strncmp(cmd, "--", 2))
8e49d503
AE
470 break;
471
231af832
LT
472 cmd += 2;
473
474 /*
475 * For legacy reasons, the "version" and "help"
476 * commands can be written with "--" prepended
477 * to make them look like flags.
478 */
479 if (!strcmp(cmd, "help"))
480 break;
481 if (!strcmp(cmd, "version"))
482 break;
8e49d503 483
231af832
LT
484 /*
485 * Check remaining flags (which by now must be
486 * "--exec-path", but maybe we will accept
487 * other arguments some day)
488 */
489 if (!strncmp(cmd, "exec-path", 9)) {
490 cmd += 9;
491 if (*cmd == '=') {
492 git_set_exec_path(cmd + 1);
493 continue;
8e49d503 494 }
231af832 495 puts(git_exec_path());
8e49d503
AE
496 exit(0);
497 }
a87cd02c 498 cmd_usage(0, NULL, NULL);
97fc6c5f 499 }
231af832
LT
500 argv[0] = cmd;
501
502 /*
503 * We search for git commands in the following order:
504 * - git_exec_path()
505 * - the path of the "git" command if we could find it
506 * in $0
507 * - the regular PATH.
508 */
509 if (exec_path)
510 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
511 exec_path = git_exec_path();
512 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 513
231af832
LT
514 /* See if it's an internal command */
515 handle_internal_command(argc, argv, envp);
516
517 /* .. then try the external ones */
518 execv_git_cmd(argv);
10b15b86
AR
519
520 if (errno == ENOENT)
a87cd02c 521 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
10b15b86
AR
522
523 fprintf(stderr, "Failed to run command '%s': %s\n",
524 git_command, strerror(errno));
8e49d503
AE
525
526 return 1;
527}