Merge branch 'maint'
[git] / help.c
1 #include "cache.h"
2 #include "builtin.h"
3 #include "exec_cmd.h"
4 #include "help.h"
5
6 /* most GUI terminals set COLUMNS (although some don't export it) */
7 static int term_columns(void)
8 {
9         char *col_string = getenv("COLUMNS");
10         int n_cols;
11
12         if (col_string && (n_cols = atoi(col_string)) > 0)
13                 return n_cols;
14
15 #ifdef TIOCGWINSZ
16         {
17                 struct winsize ws;
18                 if (!ioctl(1, TIOCGWINSZ, &ws)) {
19                         if (ws.ws_col)
20                                 return ws.ws_col;
21                 }
22         }
23 #endif
24
25         return 80;
26 }
27
28 void add_cmdname(struct cmdnames *cmds, const char *name, int len)
29 {
30         struct cmdname *ent = xmalloc(sizeof(*ent) + len + 1);
31
32         ent->len = len;
33         memcpy(ent->name, name, len);
34         ent->name[len] = 0;
35
36         ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
37         cmds->names[cmds->cnt++] = ent;
38 }
39
40 static int cmdname_compare(const void *a_, const void *b_)
41 {
42         struct cmdname *a = *(struct cmdname **)a_;
43         struct cmdname *b = *(struct cmdname **)b_;
44         return strcmp(a->name, b->name);
45 }
46
47 static void uniq(struct cmdnames *cmds)
48 {
49         int i, j;
50
51         if (!cmds->cnt)
52                 return;
53
54         for (i = j = 1; i < cmds->cnt; i++)
55                 if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
56                         cmds->names[j++] = cmds->names[i];
57
58         cmds->cnt = j;
59 }
60
61 void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes)
62 {
63         int ci, cj, ei;
64         int cmp;
65
66         ci = cj = ei = 0;
67         while (ci < cmds->cnt && ei < excludes->cnt) {
68                 cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
69                 if (cmp < 0)
70                         cmds->names[cj++] = cmds->names[ci++];
71                 else if (cmp == 0)
72                         ci++, ei++;
73                 else if (cmp > 0)
74                         ei++;
75         }
76
77         while (ci < cmds->cnt)
78                 cmds->names[cj++] = cmds->names[ci++];
79
80         cmds->cnt = cj;
81 }
82
83 static void pretty_print_string_list(struct cmdnames *cmds, int longest)
84 {
85         int cols = 1, rows;
86         int space = longest + 1; /* min 1 SP between words */
87         int max_cols = term_columns() - 1; /* don't print *on* the edge */
88         int i, j;
89
90         if (space < max_cols)
91                 cols = max_cols / space;
92         rows = (cmds->cnt + cols - 1) / cols;
93
94         for (i = 0; i < rows; i++) {
95                 printf("  ");
96
97                 for (j = 0; j < cols; j++) {
98                         int n = j * rows + i;
99                         int size = space;
100                         if (n >= cmds->cnt)
101                                 break;
102                         if (j == cols-1 || n + rows >= cmds->cnt)
103                                 size = 1;
104                         printf("%-*s", size, cmds->names[n]->name);
105                 }
106                 putchar('\n');
107         }
108 }
109
110 static int is_executable(const char *name)
111 {
112         struct stat st;
113
114         if (stat(name, &st) || /* stat, not lstat */
115             !S_ISREG(st.st_mode))
116                 return 0;
117
118 #ifdef __MINGW32__
119         /* cannot trust the executable bit, peek into the file instead */
120         char buf[3] = { 0 };
121         int n;
122         int fd = open(name, O_RDONLY);
123         st.st_mode &= ~S_IXUSR;
124         if (fd >= 0) {
125                 n = read(fd, buf, 2);
126                 if (n == 2)
127                         /* DOS executables start with "MZ" */
128                         if (!strcmp(buf, "#!") || !strcmp(buf, "MZ"))
129                                 st.st_mode |= S_IXUSR;
130                 close(fd);
131         }
132 #endif
133         return st.st_mode & S_IXUSR;
134 }
135
136 static void list_commands_in_dir(struct cmdnames *cmds,
137                                          const char *path,
138                                          const char *prefix)
139 {
140         int prefix_len;
141         DIR *dir = opendir(path);
142         struct dirent *de;
143         struct strbuf buf = STRBUF_INIT;
144         int len;
145
146         if (!dir)
147                 return;
148         if (!prefix)
149                 prefix = "git-";
150         prefix_len = strlen(prefix);
151
152         strbuf_addf(&buf, "%s/", path);
153         len = buf.len;
154
155         while ((de = readdir(dir)) != NULL) {
156                 int entlen;
157
158                 if (prefixcmp(de->d_name, prefix))
159                         continue;
160
161                 strbuf_setlen(&buf, len);
162                 strbuf_addstr(&buf, de->d_name);
163                 if (!is_executable(buf.buf))
164                         continue;
165
166                 entlen = strlen(de->d_name) - prefix_len;
167                 if (has_extension(de->d_name, ".exe"))
168                         entlen -= 4;
169
170                 add_cmdname(cmds, de->d_name + prefix_len, entlen);
171         }
172         closedir(dir);
173         strbuf_release(&buf);
174 }
175
176 void load_command_list(const char *prefix,
177                 struct cmdnames *main_cmds,
178                 struct cmdnames *other_cmds)
179 {
180         const char *env_path = getenv("PATH");
181         const char *exec_path = git_exec_path();
182
183         if (exec_path) {
184                 list_commands_in_dir(main_cmds, exec_path, prefix);
185                 qsort(main_cmds->names, main_cmds->cnt,
186                       sizeof(*main_cmds->names), cmdname_compare);
187                 uniq(main_cmds);
188         }
189
190         if (env_path) {
191                 char *paths, *path, *colon;
192                 path = paths = xstrdup(env_path);
193                 while (1) {
194                         if ((colon = strchr(path, PATH_SEP)))
195                                 *colon = 0;
196
197                         list_commands_in_dir(other_cmds, path, prefix);
198
199                         if (!colon)
200                                 break;
201                         path = colon + 1;
202                 }
203                 free(paths);
204
205                 qsort(other_cmds->names, other_cmds->cnt,
206                       sizeof(*other_cmds->names), cmdname_compare);
207                 uniq(other_cmds);
208         }
209         exclude_cmds(other_cmds, main_cmds);
210 }
211
212 void list_commands(const char *title, struct cmdnames *main_cmds,
213                    struct cmdnames *other_cmds)
214 {
215         int i, longest = 0;
216
217         for (i = 0; i < main_cmds->cnt; i++)
218                 if (longest < main_cmds->names[i]->len)
219                         longest = main_cmds->names[i]->len;
220         for (i = 0; i < other_cmds->cnt; i++)
221                 if (longest < other_cmds->names[i]->len)
222                         longest = other_cmds->names[i]->len;
223
224         if (main_cmds->cnt) {
225                 const char *exec_path = git_exec_path();
226                 printf("available %s in '%s'\n", title, exec_path);
227                 printf("----------------");
228                 mput_char('-', strlen(title) + strlen(exec_path));
229                 putchar('\n');
230                 pretty_print_string_list(main_cmds, longest);
231                 putchar('\n');
232         }
233
234         if (other_cmds->cnt) {
235                 printf("%s available from elsewhere on your $PATH\n", title);
236                 printf("---------------------------------------");
237                 mput_char('-', strlen(title));
238                 putchar('\n');
239                 pretty_print_string_list(other_cmds, longest);
240                 putchar('\n');
241         }
242 }
243
244 int is_in_cmdlist(struct cmdnames *c, const char *s)
245 {
246         int i;
247         for (i = 0; i < c->cnt; i++)
248                 if (!strcmp(s, c->names[i]->name))
249                         return 1;
250         return 0;
251 }
252
253 void help_unknown_cmd(const char *cmd)
254 {
255         fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
256         exit(1);
257 }
258
259 int cmd_version(int argc, const char **argv, const char *prefix)
260 {
261         printf("git version %s\n", git_version_string);
262         return 0;
263 }