Fix silly typo in new builtin grep
[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 "git-compat-util.h"
12 #include "exec_cmd.h"
13
14 #include "builtin.h"
15
16 static void prepend_to_path(const char *dir, int len)
17 {
18 char *path, *old_path = getenv("PATH");
19 int path_len = len;
20
21 if (!old_path)
22 old_path = "/usr/local/bin:/usr/bin:/bin";
23
24 path_len = len + strlen(old_path) + 1;
25
26 path = malloc(path_len + 1);
27
28 memcpy(path, dir, len);
29 path[len] = ':';
30 memcpy(path + len + 1, old_path, path_len - len);
31
32 setenv("PATH", path, 1);
33 }
34
35 const char git_version_string[] = GIT_VERSION;
36
37 static void handle_internal_command(int argc, const char **argv, char **envp)
38 {
39 const char *cmd = argv[0];
40 static struct cmd_struct {
41 const char *cmd;
42 int (*fn)(int, const char **, char **);
43 } commands[] = {
44 { "version", cmd_version },
45 { "help", cmd_help },
46 { "log", cmd_log },
47 { "whatchanged", cmd_whatchanged },
48 { "show", cmd_show },
49 { "grep", cmd_grep },
50 };
51 int i;
52
53 /* Turn "git cmd --help" into "git help cmd" */
54 if (argc > 1 && !strcmp(argv[1], "--help")) {
55 argv[1] = argv[0];
56 argv[0] = cmd = "help";
57 }
58
59 for (i = 0; i < ARRAY_SIZE(commands); i++) {
60 struct cmd_struct *p = commands+i;
61 if (strcmp(p->cmd, cmd))
62 continue;
63 exit(p->fn(argc, argv, envp));
64 }
65 }
66
67 int main(int argc, const char **argv, char **envp)
68 {
69 const char *cmd = argv[0];
70 char *slash = strrchr(cmd, '/');
71 char git_command[PATH_MAX + 1];
72 const char *exec_path = NULL;
73
74 /*
75 * Take the basename of argv[0] as the command
76 * name, and the dirname as the default exec_path
77 * if it's an absolute path and we don't have
78 * anything better.
79 */
80 if (slash) {
81 *slash++ = 0;
82 if (*cmd == '/')
83 exec_path = cmd;
84 cmd = slash;
85 }
86
87 /*
88 * "git-xxxx" is the same as "git xxxx", but we obviously:
89 *
90 * - cannot take flags in between the "git" and the "xxxx".
91 * - cannot execute it externally (since it would just do
92 * the same thing over again)
93 *
94 * So we just directly call the internal command handler, and
95 * die if that one cannot handle it.
96 */
97 if (!strncmp(cmd, "git-", 4)) {
98 cmd += 4;
99 argv[0] = cmd;
100 handle_internal_command(argc, argv, envp);
101 die("cannot handle %s internally", cmd);
102 }
103
104 /* Default command: "help" */
105 cmd = "help";
106
107 /* Look for flags.. */
108 while (argc > 1) {
109 cmd = *++argv;
110 argc--;
111
112 if (strncmp(cmd, "--", 2))
113 break;
114
115 cmd += 2;
116
117 /*
118 * For legacy reasons, the "version" and "help"
119 * commands can be written with "--" prepended
120 * to make them look like flags.
121 */
122 if (!strcmp(cmd, "help"))
123 break;
124 if (!strcmp(cmd, "version"))
125 break;
126
127 /*
128 * Check remaining flags (which by now must be
129 * "--exec-path", but maybe we will accept
130 * other arguments some day)
131 */
132 if (!strncmp(cmd, "exec-path", 9)) {
133 cmd += 9;
134 if (*cmd == '=') {
135 git_set_exec_path(cmd + 1);
136 continue;
137 }
138 puts(git_exec_path());
139 exit(0);
140 }
141 cmd_usage(0, NULL, NULL);
142 }
143 argv[0] = cmd;
144
145 /*
146 * We search for git commands in the following order:
147 * - git_exec_path()
148 * - the path of the "git" command if we could find it
149 * in $0
150 * - the regular PATH.
151 */
152 if (exec_path)
153 prepend_to_path(exec_path, strlen(exec_path));
154 exec_path = git_exec_path();
155 prepend_to_path(exec_path, strlen(exec_path));
156
157 /* See if it's an internal command */
158 handle_internal_command(argc, argv, envp);
159
160 /* .. then try the external ones */
161 execv_git_cmd(argv);
162
163 if (errno == ENOENT)
164 cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
165
166 fprintf(stderr, "Failed to run command '%s': %s\n",
167 git_command, strerror(errno));
168
169 return 1;
170 }