mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Not only do we do it in both rev-list.c and git.c, the revision walking code will soon want to know whether we should rewrite parenthood information or not. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
472 lines
10 KiB
C
472 lines
10 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <sys/ioctl.h>
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#include "git-compat-util.h"
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#include "exec_cmd.h"
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#include "common-cmds.h"
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#include "cache.h"
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#include "commit.h"
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#include "revision.h"
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#ifndef PATH_MAX
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# define PATH_MAX 4096
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#endif
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static const char git_usage[] =
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"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
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/* most gui terms set COLUMNS (although some don't export it) */
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static int term_columns(void)
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{
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char *col_string = getenv("COLUMNS");
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int n_cols = 0;
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if (col_string && (n_cols = atoi(col_string)) > 0)
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return n_cols;
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#ifdef TIOCGWINSZ
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{
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struct winsize ws;
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if (!ioctl(1, TIOCGWINSZ, &ws)) {
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if (ws.ws_col)
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return ws.ws_col;
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}
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}
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#endif
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return 80;
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}
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static void oom(void)
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{
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fprintf(stderr, "git: out of memory\n");
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exit(1);
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}
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static inline void mput_char(char c, unsigned int num)
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{
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while(num--)
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putchar(c);
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}
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static struct cmdname {
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size_t len;
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char name[1];
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} **cmdname;
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static int cmdname_alloc, cmdname_cnt;
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static void add_cmdname(const char *name, int len)
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{
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struct cmdname *ent;
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if (cmdname_alloc <= cmdname_cnt) {
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cmdname_alloc = cmdname_alloc + 200;
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cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
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if (!cmdname)
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oom();
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}
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ent = malloc(sizeof(*ent) + len);
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if (!ent)
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oom();
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ent->len = len;
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memcpy(ent->name, name, len);
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ent->name[len] = 0;
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cmdname[cmdname_cnt++] = ent;
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}
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static int cmdname_compare(const void *a_, const void *b_)
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{
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struct cmdname *a = *(struct cmdname **)a_;
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struct cmdname *b = *(struct cmdname **)b_;
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return strcmp(a->name, b->name);
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}
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static void pretty_print_string_list(struct cmdname **cmdname, int longest)
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{
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int cols = 1, rows;
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int space = longest + 1; /* min 1 SP between words */
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int max_cols = term_columns() - 1; /* don't print *on* the edge */
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int i, j;
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if (space < max_cols)
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cols = max_cols / space;
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rows = (cmdname_cnt + cols - 1) / cols;
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qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
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for (i = 0; i < rows; i++) {
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printf(" ");
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for (j = 0; j < cols; j++) {
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int n = j * rows + i;
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int size = space;
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if (n >= cmdname_cnt)
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break;
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if (j == cols-1 || n + rows >= cmdname_cnt)
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size = 1;
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printf("%-*s", size, cmdname[n]->name);
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}
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putchar('\n');
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}
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}
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static void list_commands(const char *exec_path, const char *pattern)
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{
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unsigned int longest = 0;
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char path[PATH_MAX];
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int dirlen;
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DIR *dir = opendir(exec_path);
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struct dirent *de;
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if (!dir) {
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fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
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exit(1);
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}
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dirlen = strlen(exec_path);
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if (PATH_MAX - 20 < dirlen) {
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fprintf(stderr, "git: insanely long exec-path '%s'\n",
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exec_path);
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exit(1);
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}
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memcpy(path, exec_path, dirlen);
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path[dirlen++] = '/';
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while ((de = readdir(dir)) != NULL) {
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struct stat st;
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int entlen;
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if (strncmp(de->d_name, "git-", 4))
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continue;
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strcpy(path+dirlen, de->d_name);
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if (stat(path, &st) || /* stat, not lstat */
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!S_ISREG(st.st_mode) ||
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!(st.st_mode & S_IXUSR))
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continue;
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entlen = strlen(de->d_name);
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if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
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entlen -= 4;
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if (longest < entlen)
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longest = entlen;
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add_cmdname(de->d_name + 4, entlen-4);
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}
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closedir(dir);
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printf("git commands available in '%s'\n", exec_path);
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printf("----------------------------");
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mput_char('-', strlen(exec_path));
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putchar('\n');
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pretty_print_string_list(cmdname, longest - 4);
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putchar('\n');
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}
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static void list_common_cmds_help()
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{
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int i, longest = 0;
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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if (longest < strlen(common_cmds[i].name))
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longest = strlen(common_cmds[i].name);
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}
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puts("The most commonly used git commands are:");
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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printf(" %s", common_cmds[i].name);
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mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
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puts(common_cmds[i].help);
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}
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puts("(use 'git help -a' to get a list of all installed git commands)");
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}
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#ifdef __GNUC__
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static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
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__attribute__((__format__(__printf__, 3, 4), __noreturn__));
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#endif
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static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
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{
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if (fmt) {
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va_list ap;
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va_start(ap, fmt);
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printf("git: ");
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vprintf(fmt, ap);
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va_end(ap);
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putchar('\n');
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}
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else
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puts(git_usage);
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if (exec_path) {
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putchar('\n');
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if (show_all)
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list_commands(exec_path, "git-*");
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else
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list_common_cmds_help();
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}
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exit(1);
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}
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static void prepend_to_path(const char *dir, int len)
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{
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char *path, *old_path = getenv("PATH");
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int path_len = len;
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if (!old_path)
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old_path = "/usr/local/bin:/usr/bin:/bin";
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path_len = len + strlen(old_path) + 1;
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path = malloc(path_len + 1);
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memcpy(path, dir, len);
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path[len] = ':';
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memcpy(path + len + 1, old_path, path_len - len);
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setenv("PATH", path, 1);
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}
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static void show_man_page(const char *git_cmd)
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{
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const char *page;
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if (!strncmp(git_cmd, "git", 3))
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page = git_cmd;
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else {
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int page_len = strlen(git_cmd) + 4;
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char *p = malloc(page_len + 1);
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strcpy(p, "git-");
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strcpy(p + 4, git_cmd);
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p[page_len] = 0;
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page = p;
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}
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execlp("man", "man", page, NULL);
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}
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static int cmd_version(int argc, const char **argv, char **envp)
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{
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printf("git version %s\n", GIT_VERSION);
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return 0;
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}
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static int cmd_help(int argc, const char **argv, char **envp)
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{
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const char *help_cmd = argv[1];
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if (!help_cmd)
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cmd_usage(0, git_exec_path(), NULL);
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else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
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cmd_usage(1, git_exec_path(), NULL);
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else
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show_man_page(help_cmd);
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return 0;
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}
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#define LOGSIZE (65536)
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static int cmd_log(int argc, const char **argv, char **envp)
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{
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struct rev_info rev;
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struct commit *commit;
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char *buf = xmalloc(LOGSIZE);
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static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
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int abbrev = DEFAULT_ABBREV;
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const char *commit_prefix = "commit ";
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argc = setup_revisions(argc, argv, &rev, "HEAD");
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while (1 < argc) {
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const char *arg = argv[1];
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if (!strncmp(arg, "--pretty", 8)) {
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commit_format = get_commit_format(arg + 8);
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if (commit_format == CMIT_FMT_ONELINE)
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commit_prefix = "";
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}
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else if (!strcmp(arg, "--no-abbrev")) {
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abbrev = 0;
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}
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else if (!strncmp(arg, "--abbrev=", 9)) {
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abbrev = strtoul(arg + 9, NULL, 10);
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if (abbrev && abbrev < MINIMUM_ABBREV)
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abbrev = MINIMUM_ABBREV;
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else if (40 < abbrev)
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abbrev = 40;
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}
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else
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die("unrecognized argument: %s", arg);
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argc--; argv++;
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}
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prepare_revision_walk(&rev);
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setup_pager();
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while ((commit = get_revision(&rev)) != NULL) {
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printf("%s%s", commit_prefix,
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sha1_to_hex(commit->object.sha1));
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if (rev.parents) {
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struct commit_list *parents = commit->parents;
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while (parents) {
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struct object *o = &(parents->item->object);
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parents = parents->next;
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if (o->flags & TMP_MARK)
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continue;
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printf(" %s", sha1_to_hex(o->sha1));
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o->flags |= TMP_MARK;
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}
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/* TMP_MARK is a general purpose flag that can
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* be used locally, but the user should clean
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* things up after it is done with them.
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*/
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for (parents = commit->parents;
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parents;
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parents = parents->next)
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parents->item->object.flags &= ~TMP_MARK;
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}
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if (commit_format == CMIT_FMT_ONELINE)
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putchar(' ');
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else
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putchar('\n');
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pretty_print_commit(commit_format, commit, ~0, buf,
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LOGSIZE, abbrev);
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printf("%s\n", buf);
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}
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free(buf);
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return 0;
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}
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static void handle_internal_command(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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static struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, char **);
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} commands[] = {
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{ "version", cmd_version },
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{ "help", cmd_help },
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{ "log", cmd_log },
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};
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int i;
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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if (strcmp(p->cmd, cmd))
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continue;
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exit(p->fn(argc, argv, envp));
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}
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}
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int main(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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char *slash = strrchr(cmd, '/');
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char git_command[PATH_MAX + 1];
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const char *exec_path = NULL;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if it's an absolute path and we don't have
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* anything better.
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*/
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if (slash) {
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*slash++ = 0;
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if (*cmd == '/')
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exec_path = cmd;
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!strncmp(cmd, "git-", 4)) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv, envp);
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die("cannot handle %s internally", cmd);
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}
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/* Default command: "help" */
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cmd = "help";
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/* Look for flags.. */
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while (argc > 1) {
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cmd = *++argv;
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argc--;
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if (strncmp(cmd, "--", 2))
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break;
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cmd += 2;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "help"))
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break;
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if (!strcmp(cmd, "version"))
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break;
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/*
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* Check remaining flags (which by now must be
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* "--exec-path", but maybe we will accept
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* other arguments some day)
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*/
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if (!strncmp(cmd, "exec-path", 9)) {
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cmd += 9;
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if (*cmd == '=') {
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git_set_exec_path(cmd + 1);
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continue;
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}
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puts(git_exec_path());
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exit(0);
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}
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cmd_usage(0, NULL, NULL);
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}
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argv[0] = cmd;
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/*
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* We search for git commands in the following order:
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* - git_exec_path()
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* - the path of the "git" command if we could find it
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* in $0
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* - the regular PATH.
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*/
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if (exec_path)
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prepend_to_path(exec_path, strlen(exec_path));
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exec_path = git_exec_path();
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prepend_to_path(exec_path, strlen(exec_path));
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/* See if it's an internal command */
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handle_internal_command(argc, argv, envp);
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/* .. then try the external ones */
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execv_git_cmd(argv);
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if (errno == ENOENT)
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cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
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fprintf(stderr, "Failed to run command '%s': %s\n",
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git_command, strerror(errno));
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return 1;
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}
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