350 lines
6.7 KiB
C
350 lines
6.7 KiB
C
/*
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* rev-parse.c
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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#include "commit.h"
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#include "refs.h"
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#include "quote.h"
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#define DO_REVS 1
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#define DO_NOREV 2
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#define DO_FLAGS 4
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#define DO_NONFLAGS 8
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static int filter = ~0;
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static char *def = NULL;
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#define NORMAL 0
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#define REVERSED 1
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static int show_type = NORMAL;
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static int symbolic = 0;
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static int abbrev = 0;
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static int output_sq = 0;
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static int revs_count = 0;
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/*
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* Some arguments are relevant "revision" arguments,
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* others are about output format or other details.
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* This sorts it all out.
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*/
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static int is_rev_argument(const char *arg)
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{
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static const char *rev_args[] = {
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"--all",
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"--bisect",
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"--dense",
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"--header",
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"--max-age=",
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"--max-count=",
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"--min-age=",
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"--no-merges",
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"--objects",
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"--objects-edge",
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"--parents",
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"--pretty",
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"--sparse",
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"--topo-order",
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"--date-order",
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"--unpacked",
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NULL
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};
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const char **p = rev_args;
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/* accept -<digit>, like traditional "head" */
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if ((*arg == '-') && isdigit(arg[1]))
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return 1;
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for (;;) {
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const char *str = *p++;
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int len;
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if (!str)
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return 0;
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len = strlen(str);
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if (!strcmp(arg, str) ||
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(str[len-1] == '=' && !strncmp(arg, str, len)))
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return 1;
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}
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}
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/* Output argument as a string, either SQ or normal */
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static void show(const char *arg)
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{
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if (output_sq) {
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int sq = '\'', ch;
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putchar(sq);
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while ((ch = *arg++)) {
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if (ch == sq)
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fputs("'\\'", stdout);
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putchar(ch);
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}
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putchar(sq);
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putchar(' ');
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}
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else
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puts(arg);
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}
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/* Output a revision, only if filter allows it */
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static void show_rev(int type, const unsigned char *sha1, const char *name)
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{
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if (!(filter & DO_REVS))
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return;
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def = NULL;
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revs_count++;
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if (type != show_type)
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putchar('^');
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if (symbolic && name)
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show(name);
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else if (abbrev)
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show(find_unique_abbrev(sha1, abbrev));
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else
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show(sha1_to_hex(sha1));
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}
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/* Output a flag, only if filter allows it. */
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static int show_flag(char *arg)
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{
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if (!(filter & DO_FLAGS))
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return 0;
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if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) {
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show(arg);
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return 1;
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}
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return 0;
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}
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static void show_default(void)
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{
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char *s = def;
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if (s) {
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unsigned char sha1[20];
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def = NULL;
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if (!get_sha1(s, sha1)) {
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show_rev(NORMAL, sha1, s);
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return;
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}
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}
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}
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static int show_reference(const char *refname, const unsigned char *sha1)
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{
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show_rev(NORMAL, sha1, refname);
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return 0;
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}
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static void show_datestring(const char *flag, const char *datestr)
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{
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static char buffer[100];
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/* date handling requires both flags and revs */
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if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS))
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return;
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snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr));
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show(buffer);
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}
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static int show_file(const char *arg)
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{
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show_default();
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if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
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show(arg);
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return 1;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int i, as_is = 0, verify = 0;
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unsigned char sha1[20];
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const char *prefix = setup_git_directory();
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git_config(git_default_config);
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for (i = 1; i < argc; i++) {
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char *arg = argv[i];
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char *dotdot;
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if (as_is) {
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if (show_file(arg) && as_is < 2)
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verify_filename(prefix, arg);
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continue;
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}
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if (!strcmp(arg,"-n")) {
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if (++i >= argc)
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die("-n requires an argument");
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if ((filter & DO_FLAGS) && (filter & DO_REVS)) {
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show(arg);
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show(argv[i]);
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}
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continue;
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}
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if (!strncmp(arg,"-n",2)) {
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if ((filter & DO_FLAGS) && (filter & DO_REVS))
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show(arg);
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continue;
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}
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if (*arg == '-') {
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if (!strcmp(arg, "--")) {
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as_is = 2;
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/* Pass on the "--" if we show anything but files.. */
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if (filter & (DO_FLAGS | DO_REVS))
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show_file(arg);
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continue;
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}
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if (!strcmp(arg, "--default")) {
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def = argv[i+1];
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i++;
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continue;
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}
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if (!strcmp(arg, "--revs-only")) {
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filter &= ~DO_NOREV;
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continue;
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}
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if (!strcmp(arg, "--no-revs")) {
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filter &= ~DO_REVS;
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continue;
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}
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if (!strcmp(arg, "--flags")) {
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filter &= ~DO_NONFLAGS;
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continue;
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}
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if (!strcmp(arg, "--no-flags")) {
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filter &= ~DO_FLAGS;
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continue;
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}
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if (!strcmp(arg, "--verify")) {
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filter &= ~(DO_FLAGS|DO_NOREV);
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verify = 1;
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continue;
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}
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if (!strcmp(arg, "--short") ||
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!strncmp(arg, "--short=", 8)) {
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filter &= ~(DO_FLAGS|DO_NOREV);
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verify = 1;
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abbrev = DEFAULT_ABBREV;
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if (arg[7] == '=')
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abbrev = strtoul(arg + 8, NULL, 10);
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if (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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continue;
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}
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if (!strcmp(arg, "--sq")) {
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output_sq = 1;
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continue;
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}
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if (!strcmp(arg, "--not")) {
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show_type ^= REVERSED;
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continue;
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}
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if (!strcmp(arg, "--symbolic")) {
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symbolic = 1;
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continue;
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}
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if (!strcmp(arg, "--all")) {
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for_each_ref(show_reference);
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continue;
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}
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if (!strcmp(arg, "--show-prefix")) {
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if (prefix)
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puts(prefix);
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continue;
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}
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if (!strcmp(arg, "--show-cdup")) {
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const char *pfx = prefix;
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while (pfx) {
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pfx = strchr(pfx, '/');
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if (pfx) {
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pfx++;
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printf("../");
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}
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}
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putchar('\n');
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continue;
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}
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if (!strcmp(arg, "--git-dir")) {
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const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
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static char cwd[PATH_MAX];
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if (gitdir) {
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puts(gitdir);
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continue;
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}
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if (!prefix) {
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puts(".git");
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continue;
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}
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if (!getcwd(cwd, PATH_MAX))
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die("unable to get current working directory");
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printf("%s/.git\n", cwd);
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continue;
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}
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if (!strncmp(arg, "--since=", 8)) {
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show_datestring("--max-age=", arg+8);
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continue;
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}
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if (!strncmp(arg, "--after=", 8)) {
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show_datestring("--max-age=", arg+8);
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continue;
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}
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if (!strncmp(arg, "--before=", 9)) {
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show_datestring("--min-age=", arg+9);
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continue;
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}
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if (!strncmp(arg, "--until=", 8)) {
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show_datestring("--min-age=", arg+8);
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continue;
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}
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if (show_flag(arg) && verify)
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die("Needed a single revision");
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continue;
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}
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/* Not a flag argument */
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dotdot = strstr(arg, "..");
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if (dotdot) {
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unsigned char end[20];
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char *next = dotdot + 2;
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char *this = arg;
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*dotdot = 0;
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if (!*next)
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next = "HEAD";
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if (dotdot == arg)
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this = "HEAD";
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if (!get_sha1(this, sha1) && !get_sha1(next, end)) {
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show_rev(NORMAL, end, next);
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show_rev(REVERSED, sha1, this);
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continue;
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}
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*dotdot = '.';
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}
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if (!get_sha1(arg, sha1)) {
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show_rev(NORMAL, sha1, arg);
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continue;
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}
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if (*arg == '^' && !get_sha1(arg+1, sha1)) {
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show_rev(REVERSED, sha1, arg+1);
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continue;
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}
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as_is = 1;
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if (!show_file(arg))
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continue;
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if (verify)
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die("Needed a single revision");
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verify_filename(prefix, arg);
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}
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show_default();
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if (verify && revs_count != 1)
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die("Needed a single revision");
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return 0;
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}
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