summaryrefslogtreecommitdiff
path: root/help.c
blob: 9d7ad6f3194086a9b7b313ee5d29634d2f221b28 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/*
 * builtin-help.c
 *
 * Builtin help-related commands (help, usage, version)
 */
#include "cache.h"
#include "builtin.h"
#include "exec_cmd.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;
}
 
static inline void mput_char(char c, unsigned int num)
{
	while(num--)
		putchar(c);
}
 
static struct cmdnames {
	int alloc;
	int cnt;
	struct cmdname {
		size_t len;
		char name[1];
	} **names;
} main_cmds, other_cmds;
 
static void add_cmdname(struct cmdnames *cmds, const char *name, int len)
{
	struct cmdname *ent = xmalloc(sizeof(*ent) + len);
 
	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 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;
}
 
static 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 = (cmds->cnt + cols - 1) / 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 unsigned int list_commands_in_dir(struct cmdnames *cmds,
					 const char *path)
{
	unsigned int longest = 0;
	const char *prefix = "git-";
	int prefix_len = strlen(prefix);
	DIR *dir = opendir(path);
	struct dirent *de;
 
	if (!dir || chdir(path))
		return 0;
 
	while ((de = readdir(dir)) != NULL) {
		struct stat st;
		int entlen;
 
		if (prefixcmp(de->d_name, prefix))
			continue;
 
		if (stat(de->d_name, &st) || /* stat, not lstat */
		    !S_ISREG(st.st_mode) ||
		    !(st.st_mode & S_IXUSR))
			continue;
 
		entlen = strlen(de->d_name) - prefix_len;
		if (has_extension(de->d_name, ".exe"))
			entlen -= 4;
 
		if (longest < entlen)
			longest = entlen;
 
		add_cmdname(cmds, de->d_name + prefix_len, entlen);
	}
	closedir(dir);
 
	return longest;
}
 
static void list_commands(void)
{
	unsigned int longest = 0;
	unsigned int len;
	const char *env_path = getenv("PATH");
	char *paths, *path, *colon;
	const char *exec_path = git_exec_path();
 
	if (exec_path)
		longest = list_commands_in_dir(&main_cmds, exec_path);
 
	if (!env_path) {
		fprintf(stderr, "PATH not set\n");
		exit(1);
	}
 
	path = paths = xstrdup(env_path);
	while (1) {
		if ((colon = strchr(path, ':')))
			*colon = 0;
 
		len = list_commands_in_dir(&other_cmds, path);
		if (len > longest)
			longest = len;
 
		if (!colon)
			break;
		path = colon + 1;
	}
	free(paths);
 
	qsort(main_cmds.names, main_cmds.cnt,
	      sizeof(*main_cmds.names), cmdname_compare);
	uniq(&main_cmds);
 
	qsort(other_cmds.names, other_cmds.cnt,
	      sizeof(*other_cmds.names), cmdname_compare);
	uniq(&other_cmds);
	exclude_cmds(&other_cmds, &main_cmds);
 
	if (main_cmds.cnt) {
		printf("available git commands in '%s'\n", exec_path);
		printf("----------------------------");
		mput_char('-', strlen(exec_path));
		putchar('\n');
		pretty_print_string_list(&main_cmds, longest);
		putchar('\n');
	}
 
	if (other_cmds.cnt) {
		printf("git commands available from elsewhere on your $PATH\n");
		printf("---------------------------------------------------\n");
		pretty_print_string_list(&other_cmds, longest);
		putchar('\n');
	}
}
 
void list_common_cmds_help(void)
{
	int i, longest = 0;
 
	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
		if (longest < strlen(common_cmds[i].name))
			longest = strlen(common_cmds[i].name);
	}
 
	puts("The most commonly used git commands are:");
	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
		printf("   %s   ", common_cmds[i].name);
		mput_char(' ', longest - strlen(common_cmds[i].name));
		puts(common_cmds[i].help);
	}
}
 
static const char *cmd_to_page(const char *git_cmd)
{
	if (!git_cmd)
		return "git";
	else if (!prefixcmp(git_cmd, "git"))
		return git_cmd;
	else {
		int page_len = strlen(git_cmd) + 4;
		char *p = xmalloc(page_len + 1);
		strcpy(p, "git-");
		strcpy(p + 4, git_cmd);
		p[page_len] = 0;
		return p;
	}
}
 
static void setup_man_path(void)
{
	struct strbuf new_path;
	const char *old_path = getenv("MANPATH");
 
	strbuf_init(&new_path, 0);
 
	/* We should always put ':' after our path. If there is no
	 * old_path, the ':' at the end will let 'man' to try
	 * system-wide paths after ours to find the manual page. If
	 * there is old_path, we need ':' as delimiter. */
	strbuf_addstr(&new_path, GIT_MAN_PATH);
	strbuf_addch(&new_path, ':');
	if (old_path)
		strbuf_addstr(&new_path, old_path);
 
	setenv("MANPATH", new_path.buf, 1);
 
	strbuf_release(&new_path);
}
 
static void show_man_page(const char *git_cmd)
{
	const char *page = cmd_to_page(git_cmd);
	setup_man_path();
	execlp("man", "man", page, NULL);
}
 
static void show_info_page(const char *git_cmd)
{
	const char *page = cmd_to_page(git_cmd);
	execlp("info", "info", "gitman", page, NULL);
}
 
static void show_html_page(const char *git_cmd)
{
	const char *page = cmd_to_page(git_cmd);
	execl_git_cmd("browse-help", page, NULL);
}
 
void help_unknown_cmd(const char *cmd)
{
	fprintf(stderr, "git: '%s' is not a git-command. See 'git --help'.\n", cmd);
	exit(1);
}
 
int cmd_version(int argc, const char **argv, const char *prefix)
{
	printf("git version %s\n", git_version_string);
	return 0;
}
 
int cmd_help(int argc, const char **argv, const char *prefix)
{
	const char *help_cmd = argv[1];
 
	if (argc < 2) {
		printf("usage: %s\n\n", git_usage_string);
		list_common_cmds_help();
		exit(0);
	}
 
	if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
		printf("usage: %s\n\n", git_usage_string);
		list_commands();
	}
 
	else if (!strcmp(help_cmd, "--web") || !strcmp(help_cmd, "-w")) {
		show_html_page(argc > 2 ? argv[2] : NULL);
	}
 
	else if (!strcmp(help_cmd, "--info") || !strcmp(help_cmd, "-i")) {
		show_info_page(argc > 2 ? argv[2] : NULL);
	}
 
	else
		show_man_page(help_cmd);
 
	return 0;
}