Allow an alias to start with "-p"
[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>
4050c0df 11#include "git-compat-util.h"
77cb17e9 12#include "exec_cmd.h"
2b11e317 13#include "cache.h"
575ba9d6 14#include "quote.h"
8e49d503 15
70827b15 16#include "builtin.h"
8e49d503
AE
17
18static void prepend_to_path(const char *dir, int len)
19{
554fe20d
TH
20 const char *old_path = getenv("PATH");
21 char *path;
8e49d503
AE
22 int path_len = len;
23
24 if (!old_path)
7dbc2c04 25 old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503
AE
26
27 path_len = len + strlen(old_path) + 1;
28
29 path = malloc(path_len + 1);
8e49d503
AE
30
31 memcpy(path, dir, len);
32 path[len] = ':';
33 memcpy(path + len + 1, old_path, path_len - len);
34
35 setenv("PATH", path, 1);
36}
37
4ab243a9
JS
38static int handle_options(const char*** argv, int* argc)
39{
40 int handled = 0;
41
42 while (*argc > 0) {
43 const char *cmd = (*argv)[0];
44 if (cmd[0] != '-')
45 break;
46
47 if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
48 setup_pager();
49 } else
50 die ("Unknown option: %s", cmd);
51
52 (*argv)++;
53 (*argc)--;
54 handled++;
55 }
56 return handled;
57}
58
2b11e317
JS
59static const char *alias_command;
60static char *alias_string = NULL;
61
62static int git_alias_config(const char *var, const char *value)
63{
64 if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
65 alias_string = strdup(value);
66 }
67 return 0;
68}
69
70static int split_cmdline(char *cmdline, const char ***argv)
71{
72 int src, dst, count = 0, size = 16;
73 char quoted = 0;
74
75 *argv = malloc(sizeof(char*) * size);
76
77 /* split alias_string */
78 (*argv)[count++] = cmdline;
79 for (src = dst = 0; cmdline[src];) {
80 char c = cmdline[src];
81 if (!quoted && isspace(c)) {
82 cmdline[dst++] = 0;
83 while (cmdline[++src]
84 && isspace(cmdline[src]))
85 ; /* skip */
86 if (count >= size) {
87 size += 16;
88 *argv = realloc(*argv, sizeof(char*) * size);
89 }
90 (*argv)[count++] = cmdline + dst;
91 } else if(!quoted && (c == '\'' || c == '"')) {
92 quoted = c;
93 src++;
94 } else if (c == quoted) {
95 quoted = 0;
96 src++;
97 } else {
98 if (c == '\\' && quoted != '\'') {
99 src++;
100 c = cmdline[src];
101 if (!c) {
102 free(*argv);
103 *argv = NULL;
104 return error("cmdline ends with \\");
105 }
106 }
107 cmdline[dst++] = c;
108 src++;
109 }
110 }
111
112 cmdline[dst] = 0;
113
114 if (quoted) {
115 free(*argv);
116 *argv = NULL;
117 return error("unclosed quote");
118 }
119
120 return count;
121}
122
123static int handle_alias(int *argcp, const char ***argv)
124{
47e5c0ca 125 int nongit = 0, ret = 0, saved_errno = errno;
2b11e317
JS
126 const char *subdir;
127
128 subdir = setup_git_directory_gently(&nongit);
129 if (!nongit) {
4ab243a9 130 int count, option_count;
2b11e317
JS
131 const char** new_argv;
132
133 alias_command = (*argv)[0];
134 git_config(git_alias_config);
135 if (alias_string) {
136
137 count = split_cmdline(alias_string, &new_argv);
4ab243a9
JS
138 option_count = handle_options(&new_argv, &count);
139 memmove(new_argv - option_count, new_argv,
140 count * sizeof(char *));
141 new_argv -= option_count;
2b11e317
JS
142
143 if (count < 1)
144 die("empty alias for %s", alias_command);
145
146 if (!strcmp(alias_command, new_argv[0]))
147 die("recursive alias: %s", alias_command);
148
575ba9d6
ML
149 if (getenv("GIT_TRACE")) {
150 int i;
151 fprintf(stderr, "trace: alias expansion: %s =>",
152 alias_command);
153 for (i = 0; i < count; ++i) {
154 fputc(' ', stderr);
155 sq_quote_print(stderr, new_argv[i]);
156 }
157 fputc('\n', stderr);
158 fflush(stderr);
159 }
160
d5b9e6cf
ML
161 new_argv = realloc(new_argv, sizeof(char*) *
162 (count + *argcp + 1));
2b11e317 163 /* insert after command name */
d5b9e6cf
ML
164 memcpy(new_argv + count, *argv + 1,
165 sizeof(char*) * *argcp);
166 new_argv[count+*argcp] = NULL;
2b11e317
JS
167
168 *argv = new_argv;
169 *argcp += count - 1;
170
171 ret = 1;
172 }
173 }
174
175 if (subdir)
176 chdir(subdir);
177
47e5c0ca
JS
178 errno = saved_errno;
179
2b11e317
JS
180 return ret;
181}
182
70827b15 183const char git_version_string[] = GIT_VERSION;
5b84f4d8 184
9201c707 185static void handle_internal_command(int argc, const char **argv, char **envp)
231af832
LT
186{
187 const char *cmd = argv[0];
188 static struct cmd_struct {
189 const char *cmd;
9201c707 190 int (*fn)(int, const char **, char **);
231af832
LT
191 } commands[] = {
192 { "version", cmd_version },
193 { "help", cmd_help },
70b006b9 194 { "log", cmd_log },
70827b15 195 { "whatchanged", cmd_whatchanged },
ba1d4505 196 { "show", cmd_show },
755225de 197 { "push", cmd_push },
68563738 198 { "format-patch", cmd_format_patch },
c7432087 199 { "count-objects", cmd_count_objects },
8ab99476 200 { "diff", cmd_diff },
5010cb5f 201 { "grep", cmd_grep },
d9b814cc 202 { "rm", cmd_rm },
0d781539 203 { "add", cmd_add },
5fb61b8d 204 { "rev-list", cmd_rev_list },
c3c8835f 205 { "init-db", cmd_init_db },
52ba03cb 206 { "get-tar-commit-id", cmd_get_tar_commit_id },
21754264 207 { "upload-tar", cmd_upload_tar },
0864f264 208 { "check-ref-format", cmd_check_ref_format },
aae01bda 209 { "ls-files", cmd_ls_files },
56d1398a 210 { "ls-tree", cmd_ls_tree },
d147e501 211 { "tar-tree", cmd_tar_tree },
6d96ac18 212 { "read-tree", cmd_read_tree },
ac6245e3 213 { "commit-tree", cmd_commit_tree },
51ce34b9 214 { "apply", cmd_apply },
e8cc9cd9
PE
215 { "show-branch", cmd_show_branch },
216 { "diff-files", cmd_diff_files },
217 { "diff-index", cmd_diff_index },
218 { "diff-stages", cmd_diff_stages },
f81daefe 219 { "diff-tree", cmd_diff_tree },
895f10c3 220 { "cat-file", cmd_cat_file },
8ed05fb5 221 { "rev-parse", cmd_rev_parse },
e690e843 222 { "write-tree", cmd_write_tree },
34488e3c 223 { "mailsplit", cmd_mailsplit },
7499c996 224 { "mailinfo", cmd_mailinfo },
fefe81c9 225 { "stripspace", cmd_stripspace },
854b4629 226 { "update-index", cmd_update_index },
00449f99 227 { "update-ref", cmd_update_ref },
ba84a797
LT
228 { "fmt-merge-msg", cmd_fmt_merge_msg },
229 { "prune", cmd_prune },
231af832
LT
230 };
231 int i;
232
1cd95087
LT
233 /* Turn "git cmd --help" into "git help cmd" */
234 if (argc > 1 && !strcmp(argv[1], "--help")) {
235 argv[1] = argv[0];
236 argv[0] = cmd = "help";
237 }
238
231af832
LT
239 for (i = 0; i < ARRAY_SIZE(commands); i++) {
240 struct cmd_struct *p = commands+i;
241 if (strcmp(p->cmd, cmd))
242 continue;
575ba9d6
ML
243
244 if (getenv("GIT_TRACE")) {
245 int i;
246 fprintf(stderr, "trace: built-in: git");
247 for (i = 0; i < argc; ++i) {
248 fputc(' ', stderr);
249 sq_quote_print(stderr, argv[i]);
250 }
251 putc('\n', stderr);
252 fflush(stderr);
253 }
254
231af832
LT
255 exit(p->fn(argc, argv, envp));
256 }
257}
258
9201c707 259int main(int argc, const char **argv, char **envp)
8e49d503 260{
9201c707 261 const char *cmd = argv[0];
231af832 262 char *slash = strrchr(cmd, '/');
231af832 263 const char *exec_path = NULL;
a025463b 264 int done_alias = 0;
231af832
LT
265
266 /*
267 * Take the basename of argv[0] as the command
268 * name, and the dirname as the default exec_path
269 * if it's an absolute path and we don't have
270 * anything better.
271 */
272 if (slash) {
273 *slash++ = 0;
274 if (*cmd == '/')
275 exec_path = cmd;
276 cmd = slash;
277 }
8e49d503 278
231af832
LT
279 /*
280 * "git-xxxx" is the same as "git xxxx", but we obviously:
281 *
282 * - cannot take flags in between the "git" and the "xxxx".
283 * - cannot execute it externally (since it would just do
284 * the same thing over again)
285 *
286 * So we just directly call the internal command handler, and
287 * die if that one cannot handle it.
288 */
289 if (!strncmp(cmd, "git-", 4)) {
290 cmd += 4;
291 argv[0] = cmd;
292 handle_internal_command(argc, argv, envp);
293 die("cannot handle %s internally", cmd);
294 }
8e49d503 295
231af832
LT
296 /* Default command: "help" */
297 cmd = "help";
8e49d503 298
231af832
LT
299 /* Look for flags.. */
300 while (argc > 1) {
4ab243a9 301 argv++;
231af832 302 argc--;
da6bf70e 303
4ab243a9
JS
304 handle_options(&argv, &argc);
305
306 cmd = *argv;
85fb65ed 307
231af832 308 if (strncmp(cmd, "--", 2))
8e49d503
AE
309 break;
310
231af832
LT
311 cmd += 2;
312
313 /*
314 * For legacy reasons, the "version" and "help"
315 * commands can be written with "--" prepended
316 * to make them look like flags.
317 */
318 if (!strcmp(cmd, "help"))
319 break;
320 if (!strcmp(cmd, "version"))
321 break;
8e49d503 322
231af832
LT
323 /*
324 * Check remaining flags (which by now must be
325 * "--exec-path", but maybe we will accept
326 * other arguments some day)
327 */
328 if (!strncmp(cmd, "exec-path", 9)) {
329 cmd += 9;
330 if (*cmd == '=') {
331 git_set_exec_path(cmd + 1);
332 continue;
8e49d503 333 }
231af832 334 puts(git_exec_path());
8e49d503
AE
335 exit(0);
336 }
a87cd02c 337 cmd_usage(0, NULL, NULL);
97fc6c5f 338 }
231af832
LT
339 argv[0] = cmd;
340
341 /*
342 * We search for git commands in the following order:
343 * - git_exec_path()
344 * - the path of the "git" command if we could find it
345 * in $0
346 * - the regular PATH.
347 */
348 if (exec_path)
349 prepend_to_path(exec_path, strlen(exec_path));
77cb17e9
MO
350 exec_path = git_exec_path();
351 prepend_to_path(exec_path, strlen(exec_path));
8e49d503 352
a025463b
JH
353 while (1) {
354 /* See if it's an internal command */
355 handle_internal_command(argc, argv, envp);
2b11e317 356
a025463b
JH
357 /* .. then try the external ones */
358 execv_git_cmd(argv);
231af832 359
a025463b
JH
360 /* It could be an alias -- this works around the insanity
361 * of overriding "git log" with "git show" by having
362 * alias.log = show
363 */
364 if (done_alias || !handle_alias(&argc, &argv))
365 break;
366 done_alias = 1;
367 }
10b15b86
AR
368
369 if (errno == ENOENT)
a87cd02c 370 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
10b15b86
AR
371
372 fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871 373 cmd, strerror(errno));
8e49d503
AE
374
375 return 1;
376}