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https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
This basically does a few things that are sadly somewhat interdependent, and nontrivial to split out - get rid of "struct log_tree_opt" The fields in "log_tree_opt" are moved into "struct rev_info", and all users of log_tree_opt are changed to use the rev_info struct instead. - add the parsing for the log_tree_opt arguments to "setup_revision()" - make setup_revision set a flag (revs->diff) if the diff-related arguments were used. This allows "git log" to decide whether it wants to show diffs or not. - make setup_revision() also initialize the diffopt part of rev_info (which we had from before, but we just didn't initialize it) - make setup_revision() do all the "finishing touches" on it all (it will do the proper flag combination logic, and call "diff_setup_done()") Now, that was the easy and straightforward part. The slightly more involved part is that some of the programs that want to use the new-and-improved rev_info parsing don't actually want _commits_, they may want tree'ish arguments instead. That meant that I had to change setup_revision() to parse the arguments not into the "revs->commits" list, but into the "revs->pending_objects" list. Then, when we do "prepare_revision_walk()", we walk that list, and create the sorted commit list from there. This actually cleaned some stuff up, but it's the less obvious part of the patch, and re-organized the "revision.c" logic somewhat. It actually paves the way for splitting argument parsing _entirely_ out of "revision.c", since now the argument parsing really is totally independent of the commit walking: that didn't use to be true, since there was lots of overlap with get_commit_reference() handling etc, now the _only_ overlap is the shared (and trivial) "add_pending_object()" thing. However, I didn't do that file split, just because I wanted the diff itself to be smaller, and show the actual changes more clearly. If this gets accepted, I'll do further cleanups then - that includes the file split, but also using the new infrastructure to do a nicer "git diff" etc. Even in this form, it actually ends up removing more lines than it adds. It's nice to note how simple and straightforward this makes the built-in "git log" command, even though it continues to support all the diff flags too. It doesn't get much simpler that this. I think this is worth merging soonish, because it does allow for future cleanup and even more sharing of code. However, it obviously touches "revision.c", which is subtle. I've tested that it passes all the tests we have, and it passes my "looks sane" detector, but somebody else should also give it a good look-over. [jc: squashed the original and three "oops this too" updates, with another fix-up.] Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
469 lines
10 KiB
C
469 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 "diff.h"
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#include "revision.h"
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#include "log-tree.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(void)
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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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const char *commit_prefix = "commit ";
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int shown = 0;
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argc = setup_revisions(argc, argv, &rev, "HEAD");
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if (argc > 1)
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die("unrecognized argument: %s", argv[1]);
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rev.no_commit_id = 1;
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if (rev.commit_format == CMIT_FMT_ONELINE)
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commit_prefix = "";
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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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if (shown && rev.diff && rev.commit_format != CMIT_FMT_ONELINE)
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putchar('\n');
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fputs(commit_prefix, stdout);
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if (rev.abbrev_commit && rev.abbrev)
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fputs(find_unique_abbrev(commit->object.sha1, rev.abbrev),
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stdout);
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else
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fputs(sha1_to_hex(commit->object.sha1), stdout);
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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 (rev.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(rev.commit_format, commit, ~0, buf,
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LOGSIZE, rev.abbrev);
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printf("%s\n", buf);
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if (rev.diff)
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log_tree_commit(&rev, commit);
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shown = 1;
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free(commit->buffer);
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commit->buffer = NULL;
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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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