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