Merge branch 'master' into lt/logopt
[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_wc(int argc, const char **argv, char **envp,
282                       struct rev_info *rev)
283 {
284         struct commit *commit;
285         char *buf = xmalloc(LOGSIZE);
286         const char *commit_prefix = "commit ";
287         int shown = 0;
288
289         if (argc > 1)
290                 die("unrecognized argument: %s", argv[1]);
291         if (rev->commit_format == CMIT_FMT_ONELINE)
292                 commit_prefix = "";
293
294         prepare_revision_walk(rev);
295         setup_pager();
296         while ((commit = get_revision(rev)) != NULL) {
297                 if (shown && rev->diff &&
298                     rev->commit_format != CMIT_FMT_ONELINE)
299                         putchar('\n');
300                 fputs(commit_prefix, stdout);
301                 if (rev->abbrev_commit && rev->abbrev)
302                         fputs(find_unique_abbrev(commit->object.sha1,
303                                                  rev->abbrev),
304                               stdout);
305                 else
306                         fputs(sha1_to_hex(commit->object.sha1), stdout);
307                 if (rev->parents) {
308                         struct commit_list *parents = commit->parents;
309                         while (parents) {
310                                 struct object *o = &(parents->item->object);
311                                 parents = parents->next;
312                                 if (o->flags & TMP_MARK)
313                                         continue;
314                                 printf(" %s", sha1_to_hex(o->sha1));
315                                 o->flags |= TMP_MARK;
316                         }
317                         /* TMP_MARK is a general purpose flag that can
318                          * be used locally, but the user should clean
319                          * things up after it is done with them.
320                          */
321                         for (parents = commit->parents;
322                              parents;
323                              parents = parents->next)
324                                 parents->item->object.flags &= ~TMP_MARK;
325                 }
326                 if (rev->commit_format == CMIT_FMT_ONELINE)
327                         putchar(' ');
328                 else
329                         putchar('\n');
330                 pretty_print_commit(rev->commit_format, commit, ~0, buf,
331                                     LOGSIZE, rev->abbrev);
332                 printf("%s\n", buf);
333                 if (rev->diff) {
334                         printf("---\n");
335                         log_tree_commit(rev, commit);
336                 }
337                 shown = 1;
338                 free(commit->buffer);
339                 commit->buffer = NULL;
340         }
341         free(buf);
342         return 0;
343 }
344
345 static int cmd_wc(int argc, const char **argv, char **envp)
346 {
347         struct rev_info rev;
348
349         init_revisions(&rev);
350         rev.abbrev = DEFAULT_ABBREV;
351         rev.no_commit_id = 1;
352         rev.commit_format = CMIT_FMT_DEFAULT;
353         rev.diff = 1;
354         rev.diffopt.recursive = 1;
355         argc = setup_revisions(argc, argv, &rev, "HEAD");
356         return cmd_log_wc(argc, argv, envp, &rev);
357 }
358
359 static int cmd_show(int argc, const char **argv, char **envp)
360 {
361         struct rev_info rev;
362
363         init_revisions(&rev);
364         rev.diff = 1;
365         rev.ignore_merges = 0;
366         rev.combine_merges = 1;
367         rev.dense_combined_merges = 1;
368         rev.abbrev = DEFAULT_ABBREV;
369         rev.commit_format = CMIT_FMT_DEFAULT;
370         rev.diffopt.recursive = 1;
371         rev.no_walk = 1;
372         argc = setup_revisions(argc, argv, &rev, "HEAD");
373         return cmd_log_wc(argc, argv, envp, &rev);
374 }
375
376 static int cmd_log(int argc, const char **argv, char **envp)
377 {
378         struct rev_info rev;
379
380         init_revisions(&rev);
381         rev.abbrev = DEFAULT_ABBREV;
382         rev.no_commit_id = 1;
383         rev.commit_format = CMIT_FMT_DEFAULT;
384         argc = setup_revisions(argc, argv, &rev, "HEAD");
385         return cmd_log_wc(argc, argv, envp, &rev);
386 }
387
388 static void handle_internal_command(int argc, const char **argv, char **envp)
389 {
390         const char *cmd = argv[0];
391         static struct cmd_struct {
392                 const char *cmd;
393                 int (*fn)(int, const char **, char **);
394         } commands[] = {
395                 { "version", cmd_version },
396                 { "help", cmd_help },
397                 { "log", cmd_log },
398                 { "whatchanged", cmd_wc },
399                 { "show", cmd_show },
400         };
401         int i;
402
403         /* Turn "git cmd --help" into "git help cmd" */
404         if (argc > 1 && !strcmp(argv[1], "--help")) {
405                 argv[1] = argv[0];
406                 argv[0] = cmd = "help";
407         }
408
409         for (i = 0; i < ARRAY_SIZE(commands); i++) {
410                 struct cmd_struct *p = commands+i;
411                 if (strcmp(p->cmd, cmd))
412                         continue;
413                 exit(p->fn(argc, argv, envp));
414         }
415 }
416
417 int main(int argc, const char **argv, char **envp)
418 {
419         const char *cmd = argv[0];
420         char *slash = strrchr(cmd, '/');
421         char git_command[PATH_MAX + 1];
422         const char *exec_path = NULL;
423
424         /*
425          * Take the basename of argv[0] as the command
426          * name, and the dirname as the default exec_path
427          * if it's an absolute path and we don't have
428          * anything better.
429          */
430         if (slash) {
431                 *slash++ = 0;
432                 if (*cmd == '/')
433                         exec_path = cmd;
434                 cmd = slash;
435         }
436
437         /*
438          * "git-xxxx" is the same as "git xxxx", but we obviously:
439          *
440          *  - cannot take flags in between the "git" and the "xxxx".
441          *  - cannot execute it externally (since it would just do
442          *    the same thing over again)
443          *
444          * So we just directly call the internal command handler, and
445          * die if that one cannot handle it.
446          */
447         if (!strncmp(cmd, "git-", 4)) {
448                 cmd += 4;
449                 argv[0] = cmd;
450                 handle_internal_command(argc, argv, envp);
451                 die("cannot handle %s internally", cmd);
452         }
453
454         /* Default command: "help" */
455         cmd = "help";
456
457         /* Look for flags.. */
458         while (argc > 1) {
459                 cmd = *++argv;
460                 argc--;
461
462                 if (strncmp(cmd, "--", 2))
463                         break;
464
465                 cmd += 2;
466
467                 /*
468                  * For legacy reasons, the "version" and "help"
469                  * commands can be written with "--" prepended
470                  * to make them look like flags.
471                  */
472                 if (!strcmp(cmd, "help"))
473                         break;
474                 if (!strcmp(cmd, "version"))
475                         break;
476
477                 /*
478                  * Check remaining flags (which by now must be
479                  * "--exec-path", but maybe we will accept
480                  * other arguments some day)
481                  */
482                 if (!strncmp(cmd, "exec-path", 9)) {
483                         cmd += 9;
484                         if (*cmd == '=') {
485                                 git_set_exec_path(cmd + 1);
486                                 continue;
487                         }
488                         puts(git_exec_path());
489                         exit(0);
490                 }
491                 cmd_usage(0, NULL, NULL);
492         }
493         argv[0] = cmd;
494
495         /*
496          * We search for git commands in the following order:
497          *  - git_exec_path()
498          *  - the path of the "git" command if we could find it
499          *    in $0
500          *  - the regular PATH.
501          */
502         if (exec_path)
503                 prepend_to_path(exec_path, strlen(exec_path));
504         exec_path = git_exec_path();
505         prepend_to_path(exec_path, strlen(exec_path));
506
507         /* See if it's an internal command */
508         handle_internal_command(argc, argv, envp);
509
510         /* .. then try the external ones */
511         execv_git_cmd(argv);
512
513         if (errno == ENOENT)
514                 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
515
516         fprintf(stderr, "Failed to run command '%s': %s\n",
517                 git_command, strerror(errno));
518
519         return 1;
520 }