11 #include "git-compat-util.h"
14 # define PATH_MAX 4096
17 static const char git_usage[] =
18 "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
20 /* most gui terms set COLUMNS (although some don't export it) */
21 static int term_columns(void)
23 char *col_string = getenv("COLUMNS");
26 if (col_string && (n_cols = atoi(col_string)) > 0)
34 fprintf(stderr, "git: out of memory\n");
38 static inline void mput_char(char c, unsigned int num)
44 static struct cmdname {
48 static int cmdname_alloc, cmdname_cnt;
50 static void add_cmdname(const char *name, int len)
53 if (cmdname_alloc <= cmdname_cnt) {
54 cmdname_alloc = cmdname_alloc + 200;
55 cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
59 ent = malloc(sizeof(*ent) + len);
63 memcpy(ent->name, name, len);
65 cmdname[cmdname_cnt++] = ent;
68 static int cmdname_compare(const void *a_, const void *b_)
70 struct cmdname *a = *(struct cmdname **)a_;
71 struct cmdname *b = *(struct cmdname **)b_;
72 return strcmp(a->name, b->name);
75 static void pretty_print_string_list(struct cmdname **cmdname, int longest)
78 int space = longest + 1; /* min 1 SP between words */
79 int max_cols = term_columns() - 1; /* don't print *on* the edge */
83 cols = max_cols / space;
85 qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
87 for (i = 0; i < cmdname_cnt; ) {
91 for (c = cols; c && i < cmdname_cnt; i++) {
92 printf("%s", cmdname[i]->name);
95 mput_char(' ', space - cmdname[i]->len);
101 static void list_commands(const char *exec_path, const char *pattern)
103 unsigned int longest = 0;
106 DIR *dir = opendir(exec_path);
110 fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
114 dirlen = strlen(exec_path);
115 if (PATH_MAX - 20 < dirlen) {
116 fprintf(stderr, "git: insanely long exec-path '%s'\n",
121 memcpy(path, exec_path, dirlen);
122 path[dirlen++] = '/';
124 while ((de = readdir(dir)) != NULL) {
128 if (strncmp(de->d_name, "git-", 4))
130 strcpy(path+dirlen, de->d_name);
131 if (stat(path, &st) || /* stat, not lstat */
132 !S_ISREG(st.st_mode) ||
133 !(st.st_mode & S_IXUSR))
136 entlen = strlen(de->d_name);
137 if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
140 if (longest < entlen)
143 add_cmdname(de->d_name + 4, entlen-4);
147 printf("git commands available in '%s'\n", exec_path);
148 printf("----------------------------");
149 mput_char('-', strlen(exec_path));
151 pretty_print_string_list(cmdname, longest - 4);
156 static void cmd_usage(const char *exec_path, const char *fmt, ...)
157 __attribute__((__format__(__printf__, 2, 3), __noreturn__));
159 static void cmd_usage(const char *exec_path, const char *fmt, ...)
176 list_commands(exec_path, "git-*");
181 static void prepend_to_path(const char *dir, int len)
183 char *path, *old_path = getenv("PATH");
187 old_path = "/usr/local/bin:/usr/bin:/bin";
189 path_len = len + strlen(old_path) + 1;
191 path = malloc(path_len + 1);
193 memcpy(path, dir, len);
195 memcpy(path + len + 1, old_path, path_len - len);
197 setenv("PATH", path, 1);
200 static void show_man_page(char *git_cmd)
204 if (!strncmp(git_cmd, "git", 3))
207 int page_len = strlen(git_cmd) + 4;
209 page = malloc(page_len + 1);
210 strcpy(page, "git-");
211 strcpy(page + 4, git_cmd);
215 execlp("man", "man", page, NULL);
218 int main(int argc, char **argv, char **envp)
220 char git_command[PATH_MAX + 1];
221 char wd[PATH_MAX + 1];
222 int i, len, show_help = 0;
223 char *exec_path = getenv("GIT_EXEC_PATH");
225 getcwd(wd, PATH_MAX);
228 exec_path = GIT_EXEC_PATH;
230 for (i = 1; i < argc; i++) {
233 if (strncmp(arg, "--", 2))
238 if (!strncmp(arg, "exec-path", 9)) {
247 else if (!strcmp(arg, "version")) {
248 printf("git version %s\n", GIT_VERSION);
251 else if (!strcmp(arg, "help"))
254 cmd_usage(NULL, NULL);
257 if (i >= argc || show_help) {
259 cmd_usage(exec_path, NULL);
261 show_man_page(argv[i]);
264 if (*exec_path != '/') {
265 if (!getcwd(git_command, sizeof(git_command))) {
267 "git: cannot determine current directory");
270 len = strlen(git_command);
272 /* Trivial cleanup */
273 while (!strncmp(exec_path, "./", 2)) {
275 while (*exec_path == '/')
278 snprintf(git_command + len, sizeof(git_command) - len,
282 strcpy(git_command, exec_path);
283 len = strlen(git_command);
284 prepend_to_path(git_command, len);
286 len += snprintf(git_command + len, sizeof(git_command) - len,
288 if (sizeof(git_command) <= len) {
289 fprintf(stderr, "git: command name given is too long.\n");
293 /* execve() can only ever return if it fails */
294 execve(git_command, &argv[i], envp);
297 cmd_usage(exec_path, "'%s' is not a git-command", argv[i]);
299 fprintf(stderr, "Failed to run command '%s': %s\n",
300 git_command, strerror(errno));