11 # define PATH_MAX 4096
14 static const char git_usage[] =
15 "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
20 struct string_list *next;
23 /* most gui terms set COLUMNS (although some don't export it) */
24 static int term_columns(void)
26 char *col_string = getenv("COLUMNS");
29 if (col_string && (n_cols = atoi(col_string)) > 0)
35 static inline void mput_char(char c, unsigned int num)
41 static void pretty_print_string_list(struct string_list *list, int longest)
44 int space = longest + 1; /* min 1 SP between words */
45 int max_cols = term_columns() - 1; /* don't print *on* the edge */
48 cols = max_cols / space;
54 for (c = cols; c && list; list = list->next) {
55 printf("%s", list->str);
58 mput_char(' ', space - list->len);
64 static void list_commands(const char *exec_path, const char *pattern)
66 struct string_list *list = NULL, *tail = NULL;
67 unsigned int longest = 0, i;
70 if (chdir(exec_path) < 0) {
71 printf("git: '%s': %s\n", exec_path, strerror(errno));
75 i = glob(pattern, 0, NULL, &gl);
78 puts("Out of memory when running glob()");
81 printf("'%s': Read error: %s\n", exec_path, strerror(errno));
84 printf("No git commands available in '%s'.\n", exec_path);
85 printf("Do you need to specify --exec-path or set GIT_EXEC_PATH?\n");
89 for (i = 0; i < gl.gl_pathc; i++) {
90 int len = strlen(gl.gl_pathv[i] + 4);
92 if (access(gl.gl_pathv[i], X_OK))
99 tail = list = malloc(sizeof(struct string_list));
101 tail->next = malloc(sizeof(struct string_list));
105 tail->str = gl.gl_pathv[i] + 4;
109 printf("git commands available in '%s'\n", exec_path);
110 printf("----------------------------");
111 mput_char('-', strlen(exec_path));
113 pretty_print_string_list(list, longest);
118 static void usage(const char *exec_path, const char *fmt, ...)
119 __attribute__((__format__(__printf__, 2, 3), __noreturn__));
121 static void usage(const char *exec_path, const char *fmt, ...)
138 list_commands(exec_path, "git-*");
143 static void prepend_to_path(const char *dir, int len)
145 char *path, *old_path = getenv("PATH");
149 old_path = "/bin:/usr/bin:.";
151 path_len = len + strlen(old_path) + 1;
153 path = malloc(path_len + 1);
154 path[path_len + 1] = '\0';
156 memcpy(path, dir, len);
158 memcpy(path + len + 1, old_path, path_len - len);
160 setenv("PATH", path, 1);
163 /* has anyone seen 'man' installed anywhere else than in /usr/bin? */
164 #define PATH_TO_MAN "/usr/bin/man"
165 static void show_man_page(char *git_cmd)
169 if (!strncmp(git_cmd, "git", 3))
172 int page_len = strlen(git_cmd) + 4;
174 page = malloc(page_len + 1);
175 strcpy(page, "git-");
176 strcpy(page + 4, git_cmd);
180 execlp(PATH_TO_MAN, "man", page, NULL);
183 int main(int argc, char **argv, char **envp)
185 char git_command[PATH_MAX + 1];
186 char wd[PATH_MAX + 1];
187 int i, len, show_help = 0;
188 char *exec_path = getenv("GIT_EXEC_PATH");
190 getcwd(wd, PATH_MAX);
193 exec_path = GIT_EXEC_PATH;
195 for (i = 1; i < argc; i++) {
198 if (strncmp(arg, "--", 2))
203 if (!strncmp(arg, "exec-path", 9)) {
212 else if (!strcmp(arg, "version")) {
213 printf("git version %s\n", GIT_VERSION);
216 else if (!strcmp(arg, "help"))
222 if (i >= argc || show_help) {
224 usage(exec_path, NULL);
226 show_man_page(argv[i]);
229 /* allow relative paths, but run with exact */
230 if (chdir(exec_path)) {
231 printf("git: '%s': %s\n", exec_path, strerror(errno));
235 getcwd(git_command, sizeof(git_command));
238 len = strlen(git_command);
239 prepend_to_path(git_command, len);
241 strncat(&git_command[len], "/git-", sizeof(git_command) - len);
243 strncat(&git_command[len], argv[i], sizeof(git_command) - len);
245 if (access(git_command, X_OK))
246 usage(exec_path, "'%s' is not a git-command", argv[i]);
248 /* execve() can only ever return if it fails */
249 execve(git_command, &argv[i], envp);
250 printf("Failed to run command '%s': %s\n", git_command, strerror(errno));