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