Skip to content
This repository
tag: v1.5.0.2
Fetching contributors…

Cannot retrieve contributors at this time

file 231 lines (194 sloc) 4.881 kb
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
/*
* builtin-help.c
*
* Builtin help-related commands (help, usage, version)
*/
#include "cache.h"
#include "builtin.h"
#include "exec_cmd.h"
#include "common-cmds.h"
#include <sys/ioctl.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 void oom(void)
{
fprintf(stderr, "git: out of memory\n");
exit(1);
}

static inline void mput_char(char c, unsigned int num)
{
while(num--)
putchar(c);
}

static struct cmdname {
size_t len;
char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;

static void add_cmdname(const char *name, int len)
{
struct cmdname *ent;
if (cmdname_alloc <= cmdname_cnt) {
cmdname_alloc = cmdname_alloc + 200;
cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
if (!cmdname)
oom();
}
ent = malloc(sizeof(*ent) + len);
if (!ent)
oom();
ent->len = len;
memcpy(ent->name, name, len);
ent->name[len] = 0;
cmdname[cmdname_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 pretty_print_string_list(struct cmdname **cmdname, 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 = (cmdname_cnt + cols - 1) / cols;

qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);

for (i = 0; i < rows; i++) {
printf(" ");

for (j = 0; j < cols; j++) {
int n = j * rows + i;
int size = space;
if (n >= cmdname_cnt)
break;
if (j == cols-1 || n + rows >= cmdname_cnt)
size = 1;
printf("%-*s", size, cmdname[n]->name);
}
putchar('\n');
}
}

static void list_commands(const char *exec_path, const char *pattern)
{
unsigned int longest = 0;
char path[PATH_MAX];
int dirlen;
DIR *dir = opendir(exec_path);
struct dirent *de;

if (!dir) {
fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
exit(1);
}

dirlen = strlen(exec_path);
if (PATH_MAX - 20 < dirlen) {
fprintf(stderr, "git: insanely long exec-path '%s'\n",
exec_path);
exit(1);
}

memcpy(path, exec_path, dirlen);
path[dirlen++] = '/';

while ((de = readdir(dir)) != NULL) {
struct stat st;
int entlen;

if (strncmp(de->d_name, "git-", 4))
continue;
strcpy(path+dirlen, de->d_name);
if (stat(path, &st) || /* stat, not lstat */
!S_ISREG(st.st_mode) ||
!(st.st_mode & S_IXUSR))
continue;

entlen = strlen(de->d_name);
if (has_extension(de->d_name, ".exe"))
entlen -= 4;

if (longest < entlen)
longest = entlen;

add_cmdname(de->d_name + 4, entlen-4);
}
closedir(dir);

printf("git commands available in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(cmdname, longest - 4);
putchar('\n');
}

static 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);
}
puts("(use 'git help -a' to get a list of all installed git commands)");
}

static void show_man_page(const char *git_cmd)
{
const char *page;

if (!strncmp(git_cmd, "git", 3))
page = 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;
page = p;
}

execlp("man", "man", page, NULL);
}

void help_unknown_cmd(const char *cmd)
{
printf("git: '%s' is not a git-command\n\n", cmd);
list_common_cmds_help();
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 = argc > 1 ? argv[1] : NULL;
const char *exec_path = git_exec_path();

if (!help_cmd) {
printf("usage: %s\n\n", git_usage_string);
list_common_cmds_help();
exit(1);
}

else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
printf("usage: %s\n\n", git_usage_string);
if(exec_path)
list_commands(exec_path, "git-*");
exit(1);
}

else
show_man_page(help_cmd);

return 0;
}
Something went wrong with that request. Please try again.