| #include "cache.h" |
| #include "builtin.h" |
| #include "exec_cmd.h" |
| #include "levenshtein.h" |
| #include "help.h" |
| #include "common-cmds.h" |
| |
| /* most GUI terminals set COLUMNS (although some don't export it) */ |
| static int term_columns(void) |
| { |
| char *col_string = getenv("COLUMNS"); |
| int n_cols; |
| |
| if (col_string && (n_cols = atoi(col_string)) > 0) |
| return n_cols; |
| |
| #ifdef TIOCGWINSZ |
| { |
| struct winsize ws; |
| if (!ioctl(1, TIOCGWINSZ, &ws)) { |
| if (ws.ws_col) |
| return ws.ws_col; |
| } |
| } |
| #endif |
| |
| return 80; |
| } |
| |
| void add_cmdname(struct cmdnames *cmds, const char *name, int len) |
| { |
| struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1); |
| |
| ent->len = len; |
| memcpy(ent->name, name, len); |
| ent->name[len] = 0; |
| |
| ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc); |
| cmds->names[cmds->cnt++] = ent; |
| } |
| |
| static void clean_cmdnames(struct cmdnames *cmds) |
| { |
| int i; |
| for (i = 0; i < cmds->cnt; ++i) |
| free(cmds->names[i]); |
| free(cmds->names); |
| cmds->cnt = 0; |
| cmds->alloc = 0; |
| } |
| |
| static int cmdname_compare(const void *a_, const void *b_) |
| { |
| struct cmdname *a = *(struct cmdname **)a_; |
| struct cmdname *b = *(struct cmdname **)b_; |
| return strcmp(a->name, b->name); |
| } |
| |
| static void uniq(struct cmdnames *cmds) |
| { |
| int i, j; |
| |
| if (!cmds->cnt) |
| return; |
| |
| for (i = j = 1; i < cmds->cnt; i++) |
| if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name)) |
| cmds->names[j++] = cmds->names[i]; |
| |
| cmds->cnt = j; |
| } |
| |
| void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes) |
| { |
| int ci, cj, ei; |
| int cmp; |
| |
| ci = cj = ei = 0; |
| while (ci < cmds->cnt && ei < excludes->cnt) { |
| cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name); |
| if (cmp < 0) |
| cmds->names[cj++] = cmds->names[ci++]; |
| else if (cmp == 0) |
| ci++, ei++; |
| else if (cmp > 0) |
| ei++; |
| } |
| |
| while (ci < cmds->cnt) |
| cmds->names[cj++] = cmds->names[ci++]; |
| |
| cmds->cnt = cj; |
| } |
| |
| static void pretty_print_string_list(struct cmdnames *cmds, int longest) |
| { |
| int cols = 1, rows; |
| int space = longest + 1; /* min 1 SP between words */ |
| int max_cols = term_columns() - 1; /* don't print *on* the edge */ |
| int i, j; |
| |
| if (space < max_cols) |
| cols = max_cols / space; |
| rows = DIV_ROUND_UP(cmds->cnt, cols); |
| |
| for (i = 0; i < rows; i++) { |
| printf(" "); |
| |
| for (j = 0; j < cols; j++) { |
| int n = j * rows + i; |
| int size = space; |
| if (n >= cmds->cnt) |
| break; |
| if (j == cols-1 || n + rows >= cmds->cnt) |
| size = 1; |
| printf("%-*s", size, cmds->names[n]->name); |
| } |
| putchar('\n'); |
| } |
| } |
| |
| static int is_executable(const char *name) |
| { |
| struct stat st; |
| |
| if (stat(name, &st) || /* stat, not lstat */ |
| !S_ISREG(st.st_mode)) |
| return 0; |
| |
| #ifdef WIN32 |
| { /* cannot trust the executable bit, peek into the file instead */ |
| char buf[3] = { 0 }; |
| int n; |
| int fd = open(name, O_RDONLY); |
| st.st_mode &= ~S_IXUSR; |
| if (fd >= 0) { |
| n = read(fd, buf, 2); |
| if (n == 2) |
| /* DOS executables start with "MZ" */ |
| if (!strcmp(buf, "#!") || !strcmp(buf, "MZ")) |
| st.st_mode |= S_IXUSR; |
| close(fd); |
| } |
| } |
| #endif |
| return st.st_mode & S_IXUSR; |
| } |
| |
| static void list_commands_in_dir(struct cmdnames *cmds, |
| const char *path, |
| const char *prefix) |
| { |
| int prefix_len; |
| DIR *dir = opendir(path); |
| struct dirent *de; |
| struct strbuf buf = STRBUF_INIT; |
| int len; |
| |
| if (!dir) |
| return; |
| if (!prefix) |
| prefix = "git-"; |
| prefix_len = strlen(prefix); |
| |
| strbuf_addf(&buf, "%s/", path); |
| len = buf.len; |
| |
| while ((de = readdir(dir)) != NULL) { |
| int entlen; |
| |
| if (prefixcmp(de->d_name, prefix)) |
| continue; |
| |
| strbuf_setlen(&buf, len); |
| strbuf_addstr(&buf, de->d_name); |
| if (!is_executable(buf.buf)) |
| continue; |
| |
| entlen = strlen(de->d_name) - prefix_len; |
| if (has_extension(de->d_name, ".exe")) |
| entlen -= 4; |
| |
| add_cmdname(cmds, de->d_name + prefix_len, entlen); |
| } |
| closedir(dir); |
| strbuf_release(&buf); |
| } |
| |
| void load_command_list(const char *prefix, |
| struct cmdnames *main_cmds, |
| struct cmdnames *other_cmds) |
| { |
| const char *env_path = getenv("PATH"); |
| const char *exec_path = git_exec_path(); |
| |
| if (exec_path) { |
| list_commands_in_dir(main_cmds, exec_path, prefix); |
| qsort(main_cmds->names, main_cmds->cnt, |
| sizeof(*main_cmds->names), cmdname_compare); |
| uniq(main_cmds); |
| } |
| |
| if (env_path) { |
| char *paths, *path, *colon; |
| path = paths = xstrdup(env_path); |
| while (1) { |
| if ((colon = strchr(path, PATH_SEP))) |
| *colon = 0; |
| if (!exec_path || strcmp(path, exec_path)) |
| list_commands_in_dir(other_cmds, path, prefix); |
| |
| if (!colon) |
| break; |
| path = colon + 1; |
| } |
| free(paths); |
| |
| qsort(other_cmds->names, other_cmds->cnt, |
| sizeof(*other_cmds->names), cmdname_compare); |
| uniq(other_cmds); |
| } |
| exclude_cmds(other_cmds, main_cmds); |
| } |
| |
| void list_commands(const char *title, struct cmdnames *main_cmds, |
| struct cmdnames *other_cmds) |
| { |
| int i, longest = 0; |
| |
| for (i = 0; i < main_cmds->cnt; i++) |
| if (longest < main_cmds->names[i]->len) |
| longest = main_cmds->names[i]->len; |
| for (i = 0; i < other_cmds->cnt; i++) |
| if (longest < other_cmds->names[i]->len) |
| longest = other_cmds->names[i]->len; |
| |
| if (main_cmds->cnt) { |
| const char *exec_path = git_exec_path(); |
| printf("available %s in '%s'\n", title, exec_path); |
| printf("----------------"); |
| mput_char('-', strlen(title) + strlen(exec_path)); |
| putchar('\n'); |
| pretty_print_string_list(main_cmds, longest); |
| putchar('\n'); |
| } |
| |
| if (other_cmds->cnt) { |
| printf("%s available from elsewhere on your $PATH\n", title); |
| printf("---------------------------------------"); |
| mput_char('-', strlen(title)); |
| putchar('\n'); |
| pretty_print_string_list(other_cmds, longest); |
| putchar('\n'); |
| } |
| } |
| |
| int is_in_cmdlist(struct cmdnames *c, const char *s) |
| { |
| int i; |
| for (i = 0; i < c->cnt; i++) |
| if (!strcmp(s, c->names[i]->name)) |
| return 1; |
| return 0; |
| } |
| |
| static int autocorrect; |
| static struct cmdnames aliases; |
| |
| static int git_unknown_cmd_config(const char *var, const char *value, void *cb) |
| { |
| if (!strcmp(var, "help.autocorrect")) |
| autocorrect = git_config_int(var,value); |
| /* Also use aliases for command lookup */ |
| if (!prefixcmp(var, "alias.")) |
| add_cmdname(&aliases, var + 6, strlen(var + 6)); |
| |
| return git_default_config(var, value, cb); |
| } |
| |
| static int levenshtein_compare(const void *p1, const void *p2) |
| { |
| const struct cmdname *const *c1 = p1, *const *c2 = p2; |
| const char *s1 = (*c1)->name, *s2 = (*c2)->name; |
| int l1 = (*c1)->len; |
| int l2 = (*c2)->len; |
| return l1 != l2 ? l1 - l2 : strcmp(s1, s2); |
| } |
| |
| static void add_cmd_list(struct cmdnames *cmds, struct cmdnames *old) |
| { |
| int i; |
| ALLOC_GROW(cmds->names, cmds->cnt + old->cnt, cmds->alloc); |
| |
| for (i = 0; i < old->cnt; i++) |
| cmds->names[cmds->cnt++] = old->names[i]; |
| free(old->names); |
| old->cnt = 0; |
| old->names = NULL; |
| } |
| |
| /* An empirically derived magic number */ |
| #define SIMILARITY_FLOOR 7 |
| #define SIMILAR_ENOUGH(x) ((x) < SIMILARITY_FLOOR) |
| |
| static const char bad_interpreter_advice[] = |
| N_("'%s' appears to be a git command, but we were not\n" |
| "able to execute it. Maybe git-%s is broken?"); |
| |
| const char *help_unknown_cmd(const char *cmd) |
| { |
| int i, n, best_similarity = 0; |
| struct cmdnames main_cmds, other_cmds; |
| |
| memset(&main_cmds, 0, sizeof(main_cmds)); |
| memset(&other_cmds, 0, sizeof(other_cmds)); |
| memset(&aliases, 0, sizeof(aliases)); |
| |
| git_config(git_unknown_cmd_config, NULL); |
| |
| load_command_list("git-", &main_cmds, &other_cmds); |
| |
| add_cmd_list(&main_cmds, &aliases); |
| add_cmd_list(&main_cmds, &other_cmds); |
| qsort(main_cmds.names, main_cmds.cnt, |
| sizeof(main_cmds.names), cmdname_compare); |
| uniq(&main_cmds); |
| |
| /* This abuses cmdname->len for levenshtein distance */ |
| for (i = 0, n = 0; i < main_cmds.cnt; i++) { |
| int cmp = 0; /* avoid compiler stupidity */ |
| const char *candidate = main_cmds.names[i]->name; |
| |
| /* |
| * An exact match means we have the command, but |
| * for some reason exec'ing it gave us ENOENT; probably |
| * it's a bad interpreter in the #! line. |
| */ |
| if (!strcmp(candidate, cmd)) |
| die(_(bad_interpreter_advice), cmd, cmd); |
| |
| /* Does the candidate appear in common_cmds list? */ |
| while (n < ARRAY_SIZE(common_cmds) && |
| (cmp = strcmp(common_cmds[n].name, candidate)) < 0) |
| n++; |
| if ((n < ARRAY_SIZE(common_cmds)) && !cmp) { |
| /* Yes, this is one of the common commands */ |
| n++; /* use the entry from common_cmds[] */ |
| if (!prefixcmp(candidate, cmd)) { |
| /* Give prefix match a very good score */ |
| main_cmds.names[i]->len = 0; |
| continue; |
| } |
| } |
| |
| main_cmds.names[i]->len = |
| levenshtein(cmd, candidate, 0, 2, 1, 4) + 1; |
| } |
| |
| qsort(main_cmds.names, main_cmds.cnt, |
| sizeof(*main_cmds.names), levenshtein_compare); |
| |
| if (!main_cmds.cnt) |
| die ("Uh oh. Your system reports no Git commands at all."); |
| |
| /* skip and count prefix matches */ |
| for (n = 0; n < main_cmds.cnt && !main_cmds.names[n]->len; n++) |
| ; /* still counting */ |
| |
| if (main_cmds.cnt <= n) { |
| /* prefix matches with everything? that is too ambiguous */ |
| best_similarity = SIMILARITY_FLOOR + 1; |
| } else { |
| /* count all the most similar ones */ |
| for (best_similarity = main_cmds.names[n++]->len; |
| (n < main_cmds.cnt && |
| best_similarity == main_cmds.names[n]->len); |
| n++) |
| ; /* still counting */ |
| } |
| if (autocorrect && n == 1 && SIMILAR_ENOUGH(best_similarity)) { |
| const char *assumed = main_cmds.names[0]->name; |
| main_cmds.names[0] = NULL; |
| clean_cmdnames(&main_cmds); |
| fprintf(stderr, "WARNING: You called a Git command named '%s', " |
| "which does not exist.\n" |
| "Continuing under the assumption that you meant '%s'\n", |
| cmd, assumed); |
| if (autocorrect > 0) { |
| fprintf(stderr, "in %0.1f seconds automatically...\n", |
| (float)autocorrect/10.0); |
| poll(NULL, 0, autocorrect * 100); |
| } |
| return assumed; |
| } |
| |
| fprintf(stderr, "git: '%s' is not a git command. See 'git --help'.\n", cmd); |
| |
| if (SIMILAR_ENOUGH(best_similarity)) { |
| fprintf(stderr, "\nDid you mean %s?\n", |
| n < 2 ? "this": "one of these"); |
| |
| for (i = 0; i < n; i++) |
| fprintf(stderr, "\t%s\n", main_cmds.names[i]->name); |
| } |
| |
| exit(1); |
| } |
| |
| int cmd_version(int argc, const char **argv, const char *prefix) |
| { |
| printf("git version %s\n", git_version_string); |
| return 0; |
| } |