1 /*
2 * builtin-help.c
3 *
4 * Builtin help-related commands (help, usage, version)
5 */
6 #include "cache.h"
7 #include "builtin.h"
8 #include "exec_cmd.h"
9 #include "common-cmds.h"
11 /* most GUI terminals set COLUMNS (although some don't export it) */
12 static int term_columns(void)
13 {
14 char *col_string = getenv("COLUMNS");
15 int n_cols;
17 if (col_string && (n_cols = atoi(col_string)) > 0)
18 return n_cols;
20 #ifdef TIOCGWINSZ
21 {
22 struct winsize ws;
23 if (!ioctl(1, TIOCGWINSZ, &ws)) {
24 if (ws.ws_col)
25 return ws.ws_col;
26 }
27 }
28 #endif
30 return 80;
31 }
33 static inline void mput_char(char c, unsigned int num)
34 {
35 while(num--)
36 putchar(c);
37 }
39 static struct cmdnames {
40 int alloc;
41 int cnt;
42 struct cmdname {
43 size_t len;
44 char name[1];
45 } **names;
46 } main_cmds, other_cmds;
48 static void add_cmdname(struct cmdnames *cmds, const char *name, int len)
49 {
50 struct cmdname *ent = xmalloc(sizeof(*ent) + len);
52 ent->len = len;
53 memcpy(ent->name, name, len);
54 ent->name[len] = 0;
56 ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
57 cmds->names[cmds->cnt++] = ent;
58 }
60 static int cmdname_compare(const void *a_, const void *b_)
61 {
62 struct cmdname *a = *(struct cmdname **)a_;
63 struct cmdname *b = *(struct cmdname **)b_;
64 return strcmp(a->name, b->name);
65 }
67 static void uniq(struct cmdnames *cmds)
68 {
69 int i, j;
71 if (!cmds->cnt)
72 return;
74 for (i = j = 1; i < cmds->cnt; i++)
75 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
76 cmds->names[j++] = cmds->names[i];
78 cmds->cnt = j;
79 }
81 static void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
82 {
83 int ci, cj, ei;
84 int cmp;
86 ci = cj = ei = 0;
87 while (ci < cmds->cnt && ei < excludes->cnt) {
88 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
89 if (cmp < 0)
90 cmds->names[cj++] = cmds->names[ci++];
91 else if (cmp == 0)
92 ci++, ei++;
93 else if (cmp > 0)
94 ei++;
95 }
97 while (ci < cmds->cnt)
98 cmds->names[cj++] = cmds->names[ci++];
100 cmds->cnt = cj;
101 }
103 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
104 {
105 int cols = 1, rows;
106 int space = longest + 1; /* min 1 SP between words */
107 int max_cols = term_columns() - 1; /* don't print *on* the edge */
108 int i, j;
110 if (space < max_cols)
111 cols = max_cols / space;
112 rows = (cmds->cnt + cols - 1) / cols;
114 for (i = 0; i < rows; i++) {
115 printf(" ");
117 for (j = 0; j < cols; j++) {
118 int n = j * rows + i;
119 int size = space;
120 if (n >= cmds->cnt)
121 break;
122 if (j == cols-1 || n + rows >= cmds->cnt)
123 size = 1;
124 printf("%-*s", size, cmds->names[n]->name);
125 }
126 putchar('\n');
127 }
128 }
130 static unsigned int list_commands_in_dir(struct cmdnames *cmds,
131 const char *path)
132 {
133 unsigned int longest = 0;
134 const char *prefix = "git-";
135 int prefix_len = strlen(prefix);
136 DIR *dir = opendir(path);
137 struct dirent *de;
139 if (!dir || chdir(path))
140 return 0;
142 while ((de = readdir(dir)) != NULL) {
143 struct stat st;
144 int entlen;
146 if (prefixcmp(de->d_name, prefix))
147 continue;
149 if (stat(de->d_name, &st) || /* stat, not lstat */
150 !S_ISREG(st.st_mode) ||
151 !(st.st_mode & S_IXUSR))
152 continue;
154 entlen = strlen(de->d_name) - prefix_len;
155 if (has_extension(de->d_name, ".exe"))
156 entlen -= 4;
158 if (longest < entlen)
159 longest = entlen;
161 add_cmdname(cmds, de->d_name + prefix_len, entlen);
162 }
163 closedir(dir);
165 return longest;
166 }
168 static void list_commands(void)
169 {
170 unsigned int longest = 0;
171 unsigned int len;
172 const char *env_path = getenv("PATH");
173 char *paths, *path, *colon;
174 const char *exec_path = git_exec_path();
176 if (exec_path)
177 longest = list_commands_in_dir(&main_cmds, exec_path);
179 if (!env_path) {
180 fprintf(stderr, "PATH not set\n");
181 exit(1);
182 }
184 path = paths = xstrdup(env_path);
185 while (1) {
186 if ((colon = strchr(path, ':')))
187 *colon = 0;
189 len = list_commands_in_dir(&other_cmds, path);
190 if (len > longest)
191 longest = len;
193 if (!colon)
194 break;
195 path = colon + 1;
196 }
197 free(paths);
199 qsort(main_cmds.names, main_cmds.cnt,
200 sizeof(*main_cmds.names), cmdname_compare);
201 uniq(&main_cmds);
203 qsort(other_cmds.names, other_cmds.cnt,
204 sizeof(*other_cmds.names), cmdname_compare);
205 uniq(&other_cmds);
206 exclude_cmds(&other_cmds, &main_cmds);
208 if (main_cmds.cnt) {
209 printf("available git commands in '%s'\n", exec_path);
210 printf("----------------------------");
211 mput_char('-', strlen(exec_path));
212 putchar('\n');
213 pretty_print_string_list(&main_cmds, longest);
214 putchar('\n');
215 }
217 if (other_cmds.cnt) {
218 printf("git commands available from elsewhere on your $PATH\n");
219 printf("---------------------------------------------------\n");
220 pretty_print_string_list(&other_cmds, longest);
221 putchar('\n');
222 }
223 }
225 void list_common_cmds_help(void)
226 {
227 int i, longest = 0;
229 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
230 if (longest < strlen(common_cmds[i].name))
231 longest = strlen(common_cmds[i].name);
232 }
234 puts("The most commonly used git commands are:");
235 for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
236 printf(" %s ", common_cmds[i].name);
237 mput_char(' ', longest - strlen(common_cmds[i].name));
238 puts(common_cmds[i].help);
239 }
240 }
242 static const char *cmd_to_page(const char *git_cmd)
243 {
244 if (!git_cmd)
245 return "git";
246 else if (!prefixcmp(git_cmd, "git"))
247 return git_cmd;
248 else {
249 int page_len = strlen(git_cmd) + 4;
250 char *p = xmalloc(page_len + 1);
251 strcpy(p, "git-");
252 strcpy(p + 4, git_cmd);
253 p[page_len] = 0;
254 return p;
255 }
256 }
258 static void setup_man_path(void)
259 {
260 struct strbuf new_path;
261 const char *old_path = getenv("MANPATH");
263 strbuf_init(&new_path, 0);
265 /* We should always put ':' after our path. If there is no
266 * old_path, the ':' at the end will let 'man' to try
267 * system-wide paths after ours to find the manual page. If
268 * there is old_path, we need ':' as delimiter. */
269 strbuf_addstr(&new_path, GIT_MAN_PATH);
270 strbuf_addch(&new_path, ':');
271 if (old_path)
272 strbuf_addstr(&new_path, old_path);
274 setenv("MANPATH", new_path.buf, 1);
276 strbuf_release(&new_path);
277 }
279 static void show_man_page(const char *git_cmd)
280 {
281 const char *page = cmd_to_page(git_cmd);
282 setup_man_path();
283 execlp("man", "man", page, NULL);
284 }
286 static void show_info_page(const char *git_cmd)
287 {
288 const char *page = cmd_to_page(git_cmd);
289 setenv("INFOPATH", GIT_INFO_PATH, 1);
290 execlp("info", "info", "gitman", page, NULL);
291 }
293 static void show_html_page(const char *git_cmd)
294 {
295 const char *page = cmd_to_page(git_cmd);
296 execl_git_cmd("browse-help", page, NULL);
297 }
299 void help_unknown_cmd(const char *cmd)
300 {
301 fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
302 exit(1);
303 }
305 int cmd_version(int argc, const char **argv, const char *prefix)
306 {
307 printf("git version %s\n", git_version_string);
308 return 0;
309 }
311 int cmd_help(int argc, const char **argv, const char *prefix)
312 {
313 const char *help_cmd = argv[1];
315 if (argc < 2) {
316 printf("usage: %s\n\n", git_usage_string);
317 list_common_cmds_help();
318 exit(0);
319 }
321 if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
322 printf("usage: %s\n\n", git_usage_string);
323 list_commands();
324 }
326 else if (!strcmp(help_cmd, "--web") || !strcmp(help_cmd, "-w")) {
327 show_html_page(argc > 2 ? argv[2] : NULL);
328 }
330 else if (!strcmp(help_cmd, "--info") || !strcmp(help_cmd, "-i")) {
331 show_info_page(argc > 2 ? argv[2] : NULL);
332 }
334 else
335 show_man_page(help_cmd);
337 return 0;
338 }