Code

Merge branch 'jc/name' into next
[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"
16 #include "cache.h"
17 #include "commit.h"
18 #include "revision.h"
20 #ifndef PATH_MAX
21 # define PATH_MAX 4096
22 #endif
24 static const char git_usage[] =
25         "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
27 /* most gui terms set COLUMNS (although some don't export it) */
28 static int term_columns(void)
29 {
30         char *col_string = getenv("COLUMNS");
31         int n_cols = 0;
33         if (col_string && (n_cols = atoi(col_string)) > 0)
34                 return n_cols;
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
46         return 80;
47 }
49 static void oom(void)
50 {
51         fprintf(stderr, "git: out of memory\n");
52         exit(1);
53 }
55 static inline void mput_char(char c, unsigned int num)
56 {
57         while(num--)
58                 putchar(c);
59 }
61 static struct cmdname {
62         size_t len;
63         char name[1];
64 } **cmdname;
65 static int cmdname_alloc, cmdname_cnt;
67 static 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 }
85 static 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 }
92 static 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;
99         if (space < max_cols)
100                 cols = max_cols / space;
101         rows = (cmdname_cnt + cols - 1) / cols;
103         qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
105         for (i = 0; i < rows; i++) {
106                 printf("  ");
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         }
121 static void list_commands(const char *exec_path, const char *pattern)
123         unsigned int longest = 0;
124         char path[PATH_MAX];
125         int dirlen;
126         DIR *dir = opendir(exec_path);
127         struct dirent *de;
129         if (!dir) {
130                 fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
131                 exit(1);
132         }
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         }
141         memcpy(path, exec_path, dirlen);
142         path[dirlen++] = '/';
144         while ((de = readdir(dir)) != NULL) {
145                 struct stat st;
146                 int entlen;
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;
156                 entlen = strlen(de->d_name);
157                 if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
158                         entlen -= 4;
160                 if (longest < entlen)
161                         longest = entlen;
163                 add_cmdname(de->d_name + 4, entlen-4);
164         }
165         closedir(dir);
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');
175 static void list_common_cmds_help()
177         int i, longest = 0;
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         }
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)");
193 #ifdef __GNUC__
194 static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
195         __attribute__((__format__(__printf__, 3, 4), __noreturn__));
196 #endif
197 static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
199         if (fmt) {
200                 va_list ap;
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);
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         }
219         exit(1);
222 static void prepend_to_path(const char *dir, int len)
224         char *path, *old_path = getenv("PATH");
225         int path_len = len;
227         if (!old_path)
228                 old_path = "/usr/local/bin:/usr/bin:/bin";
230         path_len = len + strlen(old_path) + 1;
232         path = malloc(path_len + 1);
234         memcpy(path, dir, len);
235         path[len] = ':';
236         memcpy(path + len + 1, old_path, path_len - len);
238         setenv("PATH", path, 1);
241 static void show_man_page(const char *git_cmd)
243         const char *page;
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         }
256         execlp("man", "man", page, NULL);
259 static int cmd_version(int argc, const char **argv, char **envp)
261         printf("git version %s\n", GIT_VERSION);
262         return 0;
265 static int cmd_help(int argc, const char **argv, char **envp)
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;
277 #define LOGSIZE (65536)
279 static int cmd_log(int argc, const char **argv, char **envp)
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         int show_parents = 0;
287         const char *commit_prefix = "commit ";
289         argc = setup_revisions(argc, argv, &rev, "HEAD");
290         while (1 < argc) {
291                 const char *arg = argv[1];
292                 if (!strncmp(arg, "--pretty", 8)) {
293                         commit_format = get_commit_format(arg + 8);
294                         if (commit_format == CMIT_FMT_ONELINE)
295                                 commit_prefix = "";
296                 }
297                 else if (!strcmp(arg, "--parents")) {
298                         show_parents = 1;
299                 }
300                 else if (!strcmp(arg, "--no-abbrev")) {
301                         abbrev = 0;
302                 }
303                 else if (!strncmp(arg, "--abbrev=", 9)) {
304                         abbrev = strtoul(arg + 9, NULL, 10);
305                         if (abbrev && abbrev < MINIMUM_ABBREV)
306                                 abbrev = MINIMUM_ABBREV;
307                         else if (40 < abbrev)
308                                 abbrev = 40;
309                 }
310                 else
311                         die("unrecognized argument: %s", arg);
312                 argc--; argv++;
313         }
315         prepare_revision_walk(&rev);
316         setup_pager();
317         while ((commit = get_revision(&rev)) != NULL) {
318                 printf("%s%s", commit_prefix,
319                        sha1_to_hex(commit->object.sha1));
320                 if (show_parents) {
321                         struct commit_list *parents = commit->parents;
322                         while (parents) {
323                                 struct object *o = &(parents->item->object);
324                                 parents = parents->next;
325                                 if (o->flags & TMP_MARK)
326                                         continue;
327                                 printf(" %s", sha1_to_hex(o->sha1));
328                                 o->flags |= TMP_MARK;
329                         }
330                         /* TMP_MARK is a general purpose flag that can
331                          * be used locally, but the user should clean
332                          * things up after it is done with them.
333                          */
334                         for (parents = commit->parents;
335                              parents;
336                              parents = parents->next)
337                                 parents->item->object.flags &= ~TMP_MARK;
338                 }
339                 if (commit_format == CMIT_FMT_ONELINE)
340                         putchar(' ');
341                 else
342                         putchar('\n');
343                 pretty_print_commit(commit_format, commit, ~0, buf,
344                                     LOGSIZE, abbrev);
345                 printf("%s\n", buf);
346         }
347         free(buf);
348         return 0;
351 static void handle_internal_command(int argc, const char **argv, char **envp)
353         const char *cmd = argv[0];
354         static struct cmd_struct {
355                 const char *cmd;
356                 int (*fn)(int, const char **, char **);
357         } commands[] = {
358                 { "version", cmd_version },
359                 { "help", cmd_help },
360                 { "log", cmd_log },
361         };
362         int i;
364         for (i = 0; i < ARRAY_SIZE(commands); i++) {
365                 struct cmd_struct *p = commands+i;
366                 if (strcmp(p->cmd, cmd))
367                         continue;
368                 exit(p->fn(argc, argv, envp));
369         }
372 int main(int argc, const char **argv, char **envp)
374         const char *cmd = argv[0];
375         char *slash = strrchr(cmd, '/');
376         char git_command[PATH_MAX + 1];
377         const char *exec_path = NULL;
379         /*
380          * Take the basename of argv[0] as the command
381          * name, and the dirname as the default exec_path
382          * if it's an absolute path and we don't have
383          * anything better.
384          */
385         if (slash) {
386                 *slash++ = 0;
387                 if (*cmd == '/')
388                         exec_path = cmd;
389                 cmd = slash;
390         }
392         /*
393          * "git-xxxx" is the same as "git xxxx", but we obviously:
394          *
395          *  - cannot take flags in between the "git" and the "xxxx".
396          *  - cannot execute it externally (since it would just do
397          *    the same thing over again)
398          *
399          * So we just directly call the internal command handler, and
400          * die if that one cannot handle it.
401          */
402         if (!strncmp(cmd, "git-", 4)) {
403                 cmd += 4;
404                 argv[0] = cmd;
405                 handle_internal_command(argc, argv, envp);
406                 die("cannot handle %s internally", cmd);
407         }
409         /* Default command: "help" */
410         cmd = "help";
412         /* Look for flags.. */
413         while (argc > 1) {
414                 cmd = *++argv;
415                 argc--;
417                 if (strncmp(cmd, "--", 2))
418                         break;
420                 cmd += 2;
422                 /*
423                  * For legacy reasons, the "version" and "help"
424                  * commands can be written with "--" prepended
425                  * to make them look like flags.
426                  */
427                 if (!strcmp(cmd, "help"))
428                         break;
429                 if (!strcmp(cmd, "version"))
430                         break;
432                 /*
433                  * Check remaining flags (which by now must be
434                  * "--exec-path", but maybe we will accept
435                  * other arguments some day)
436                  */
437                 if (!strncmp(cmd, "exec-path", 9)) {
438                         cmd += 9;
439                         if (*cmd == '=') {
440                                 git_set_exec_path(cmd + 1);
441                                 continue;
442                         }
443                         puts(git_exec_path());
444                         exit(0);
445                 }
446                 cmd_usage(0, NULL, NULL);
447         }
448         argv[0] = cmd;
450         /*
451          * We search for git commands in the following order:
452          *  - git_exec_path()
453          *  - the path of the "git" command if we could find it
454          *    in $0
455          *  - the regular PATH.
456          */
457         if (exec_path)
458                 prepend_to_path(exec_path, strlen(exec_path));
459         exec_path = git_exec_path();
460         prepend_to_path(exec_path, strlen(exec_path));
462         /* See if it's an internal command */
463         handle_internal_command(argc, argv, envp);
465         /* .. then try the external ones */
466         execv_git_cmd(argv);
468         if (errno == ENOENT)
469                 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
471         fprintf(stderr, "Failed to run command '%s': %s\n",
472                 git_command, strerror(errno));
474         return 1;