help.con commit Merge git://repo.or.cz/git-gui (1500f7b)
   1#include "cache.h"
   2#include "builtin.h"
   3#include "exec_cmd.h"
   4#include "levenshtein.h"
   5#include "help.h"
   6
   7/* most GUI terminals set COLUMNS (although some don't export it) */
   8static int term_columns(void)
   9{
  10        char *col_string = getenv("COLUMNS");
  11        int n_cols;
  12
  13        if (col_string && (n_cols = atoi(col_string)) > 0)
  14                return n_cols;
  15
  16#ifdef TIOCGWINSZ
  17        {
  18                struct winsize ws;
  19                if (!ioctl(1, TIOCGWINSZ, &ws)) {
  20                        if (ws.ws_col)
  21                                return ws.ws_col;
  22                }
  23        }
  24#endif
  25
  26        return 80;
  27}
  28
  29void add_cmdname(struct cmdnames *cmds, const char *name, int len)
  30{
  31        struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);
  32
  33        ent->len = len;
  34        memcpy(ent->name, name, len);
  35        ent->name[len] = 0;
  36
  37        ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
  38        cmds->names[cmds->cnt++] = ent;
  39}
  40
  41static void clean_cmdnames(struct cmdnames *cmds)
  42{
  43        int i;
  44        for (i = 0; i < cmds->cnt; ++i)
  45                free(cmds->names[i]);
  46        free(cmds->names);
  47        cmds->cnt = 0;
  48        cmds->alloc = 0;
  49}
  50
  51static int cmdname_compare(const void *a_, const void *b_)
  52{
  53        struct cmdname *a = *(struct cmdname **)a_;
  54        struct cmdname *b = *(struct cmdname **)b_;
  55        return strcmp(a->name, b->name);
  56}
  57
  58static void uniq(struct cmdnames *cmds)
  59{
  60        int i, j;
  61
  62        if (!cmds->cnt)
  63                return;
  64
  65        for (i = j = 1; i < cmds->cnt; i++)
  66                if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
  67                        cmds->names[j++] = cmds->names[i];
  68
  69        cmds->cnt = j;
  70}
  71
  72void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
  73{
  74        int ci, cj, ei;
  75        int cmp;
  76
  77        ci = cj = ei = 0;
  78        while (ci < cmds->cnt && ei < excludes->cnt) {
  79                cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
  80                if (cmp < 0)
  81                        cmds->names[cj++] = cmds->names[ci++];
  82                else if (cmp == 0)
  83                        ci++, ei++;
  84                else if (cmp > 0)
  85                        ei++;
  86        }
  87
  88        while (ci < cmds->cnt)
  89                cmds->names[cj++] = cmds->names[ci++];
  90
  91        cmds->cnt = cj;
  92}
  93
  94static void pretty_print_string_list(struct cmdnames *cmds, int longest)
  95{
  96        int cols = 1, rows;
  97        int space = longest + 1; /* min 1 SP between words */
  98        int max_cols = term_columns() - 1; /* don't print *on* the edge */
  99        int i, j;
 100
 101        if (space < max_cols)
 102                cols = max_cols / space;
 103        rows = (cmds->cnt + cols - 1) / cols;
 104
 105        for (i = 0; i < rows; i++) {
 106                printf("  ");
 107
 108                for (j = 0; j < cols; j++) {
 109                        int n = j * rows + i;
 110                        int size = space;
 111                        if (n >= cmds->cnt)
 112                                break;
 113                        if (j == cols-1 || n + rows >= cmds->cnt)
 114                                size = 1;
 115                        printf("%-*s", size, cmds->names[n]->name);
 116                }
 117                putchar('\n');
 118        }
 119}
 120
 121static int is_executable(const char *name)
 122{
 123        struct stat st;
 124
 125        if (stat(name, &st) || /* stat, not lstat */
 126            !S_ISREG(st.st_mode))
 127                return 0;
 128
 129#ifdef __MINGW32__
 130        /* cannot trust the executable bit, peek into the file instead */
 131        char buf[3] = { 0 };
 132        int n;
 133        int fd = open(name, O_RDONLY);
 134        st.st_mode &= ~S_IXUSR;
 135        if (fd >= 0) {
 136                n = read(fd, buf, 2);
 137                if (n == 2)
 138                        /* DOS executables start with "MZ" */
 139                        if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
 140                                st.st_mode |= S_IXUSR;
 141                close(fd);
 142        }
 143#endif
 144        return st.st_mode & S_IXUSR;
 145}
 146
 147static void list_commands_in_dir(struct cmdnames *cmds,
 148                                         const char *path,
 149                                         const char *prefix)
 150{
 151        int prefix_len;
 152        DIR *dir = opendir(path);
 153        struct dirent *de;
 154        struct strbuf buf = STRBUF_INIT;
 155        int len;
 156
 157        if (!dir)
 158                return;
 159        if (!prefix)
 160                prefix = "git-";
 161        prefix_len = strlen(prefix);
 162
 163        strbuf_addf(&buf, "%s/", path);
 164        len = buf.len;
 165
 166        while ((de = readdir(dir)) != NULL) {
 167                int entlen;
 168
 169                if (prefixcmp(de->d_name, prefix))
 170                        continue;
 171
 172                strbuf_setlen(&buf, len);
 173                strbuf_addstr(&buf, de->d_name);
 174                if (!is_executable(buf.buf))
 175                        continue;
 176
 177                entlen = strlen(de->d_name) - prefix_len;
 178                if (has_extension(de->d_name, ".exe"))
 179                        entlen -= 4;
 180
 181                add_cmdname(cmds, de->d_name + prefix_len, entlen);
 182        }
 183        closedir(dir);
 184        strbuf_release(&buf);
 185}
 186
 187void load_command_list(const char *prefix,
 188                struct cmdnames *main_cmds,
 189                struct cmdnames *other_cmds)
 190{
 191        const char *env_path = getenv("PATH");
 192        const char *exec_path = git_exec_path();
 193
 194        if (exec_path) {
 195                list_commands_in_dir(main_cmds, exec_path, prefix);
 196                qsort(main_cmds->names, main_cmds->cnt,
 197                      sizeof(*main_cmds->names), cmdname_compare);
 198                uniq(main_cmds);
 199        }
 200
 201        if (env_path) {
 202                char *paths, *path, *colon;
 203                path = paths = xstrdup(env_path);
 204                while (1) {
 205                        if ((colon = strchr(path, PATH_SEP)))
 206                                *colon = 0;
 207
 208                        list_commands_in_dir(other_cmds, path, prefix);
 209
 210                        if (!colon)
 211                                break;
 212                        path = colon + 1;
 213                }
 214                free(paths);
 215
 216                qsort(other_cmds->names, other_cmds->cnt,
 217                      sizeof(*other_cmds->names), cmdname_compare);
 218                uniq(other_cmds);
 219        }
 220        exclude_cmds(other_cmds, main_cmds);
 221}
 222
 223void list_commands(const char *title, struct cmdnames *main_cmds,
 224                   struct cmdnames *other_cmds)
 225{
 226        int i, longest = 0;
 227
 228        for (i = 0; i < main_cmds->cnt; i++)
 229                if (longest < main_cmds->names[i]->len)
 230                        longest = main_cmds->names[i]->len;
 231        for (i = 0; i < other_cmds->cnt; i++)
 232                if (longest < other_cmds->names[i]->len)
 233                        longest = other_cmds->names[i]->len;
 234
 235        if (main_cmds->cnt) {
 236                const char *exec_path = git_exec_path();
 237                printf("available %s in '%s'\n", title, exec_path);
 238                printf("----------------");
 239                mput_char('-', strlen(title) + strlen(exec_path));
 240                putchar('\n');
 241                pretty_print_string_list(main_cmds, longest);
 242                putchar('\n');
 243        }
 244
 245        if (other_cmds->cnt) {
 246                printf("%s available from elsewhere on your $PATH\n", title);
 247                printf("---------------------------------------");
 248                mput_char('-', strlen(title));
 249                putchar('\n');
 250                pretty_print_string_list(other_cmds, longest);
 251                putchar('\n');
 252        }
 253}
 254
 255int is_in_cmdlist(struct cmdnames *c, const char *s)
 256{
 257        int i;
 258        for (i = 0; i < c->cnt; i++)
 259                if (!strcmp(s, c->names[i]->name))
 260                        return 1;
 261        return 0;
 262}
 263
 264static int autocorrect;
 265
 266static int git_unknown_cmd_config(const char *var, const char *value, void *cb)
 267{
 268        if (!strcmp(var, "help.autocorrect"))
 269                autocorrect = git_config_int(var,value);
 270
 271        return git_default_config(var, value, cb);
 272}
 273
 274static int levenshtein_compare(const void *p1, const void *p2)
 275{
 276        const struct cmdname *const *c1 = p1, *const *c2 = p2;
 277        const char *s1 = (*c1)->name, *s2 = (*c2)->name;
 278        int l1 = (*c1)->len;
 279        int l2 = (*c2)->len;
 280        return l1 != l2 ? l1 - l2 : strcmp(s1, s2);
 281}
 282
 283const char *help_unknown_cmd(const char *cmd)
 284{
 285        int i, n, best_similarity = 0;
 286        struct cmdnames main_cmds, other_cmds;
 287
 288        memset(&main_cmds, 0, sizeof(main_cmds));
 289        memset(&other_cmds, 0, sizeof(main_cmds));
 290
 291        git_config(git_unknown_cmd_config, NULL);
 292
 293        load_command_list("git-", &main_cmds, &other_cmds);
 294
 295        ALLOC_GROW(main_cmds.names, main_cmds.cnt + other_cmds.cnt,
 296                   main_cmds.alloc);
 297        memcpy(main_cmds.names + main_cmds.cnt, other_cmds.names,
 298               other_cmds.cnt * sizeof(other_cmds.names[0]));
 299        main_cmds.cnt += other_cmds.cnt;
 300        free(other_cmds.names);
 301
 302        /* This reuses cmdname->len for similarity index */
 303        for (i = 0; i < main_cmds.cnt; ++i)
 304                main_cmds.names[i]->len =
 305                        levenshtein(cmd, main_cmds.names[i]->name, 0, 2, 1, 4);
 306
 307        qsort(main_cmds.names, main_cmds.cnt,
 308              sizeof(*main_cmds.names), levenshtein_compare);
 309
 310        if (!main_cmds.cnt)
 311                die ("Uh oh. Your system reports no Git commands at all.");
 312
 313        best_similarity = main_cmds.names[0]->len;
 314        n = 1;
 315        while (n < main_cmds.cnt && best_similarity == main_cmds.names[n]->len)
 316                ++n;
 317        if (autocorrect && n == 1) {
 318                const char *assumed = main_cmds.names[0]->name;
 319                main_cmds.names[0] = NULL;
 320                clean_cmdnames(&main_cmds);
 321                fprintf(stderr, "WARNING: You called a Git program named '%s', "
 322                        "which does not exist.\n"
 323                        "Continuing under the assumption that you meant '%s'\n",
 324                        cmd, assumed);
 325                if (autocorrect > 0) {
 326                        fprintf(stderr, "in %0.1f seconds automatically...\n",
 327                                (float)autocorrect/10.0);
 328                        poll(NULL, 0, autocorrect * 100);
 329                }
 330                return assumed;
 331        }
 332
 333        fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
 334
 335        if (best_similarity < 6) {
 336                fprintf(stderr, "\nDid you mean %s?\n",
 337                        n < 2 ? "this": "one of these");
 338
 339                for (i = 0; i < n; i++)
 340                        fprintf(stderr, "\t%s\n", main_cmds.names[i]->name);
 341        }
 342
 343        exit(1);
 344}
 345
 346int cmd_version(int argc, const char **argv, const char *prefix)
 347{
 348        printf("git version %s\n", git_version_string);
 349        return 0;
 350}