diff options
Diffstat (limited to 'builtin-rev-parse.c')
| -rw-r--r-- | builtin-rev-parse.c | 398 |
1 files changed, 398 insertions, 0 deletions
diff --git a/builtin-rev-parse.c b/builtin-rev-parse.c new file mode 100644 index 0000000..37addb2 --- /dev/null +++ b/builtin-rev-parse.c @@ -0,0 +1,398 @@ +/* + * rev-parse.c + * + * Copyright (C) Linus Torvalds, 2005 + */ +#include "cache.h" +#include "commit.h" +#include "refs.h" +#include "quote.h" +#include "builtin.h" + +#define DO_REVS 1 +#define DO_NOREV 2 +#define DO_FLAGS 4 +#define DO_NONFLAGS 8 +static int filter = ~0; + +static const char *def; + +#define NORMAL 0 +#define REVERSED 1 +static int show_type = NORMAL; +static int symbolic; +static int abbrev; +static int output_sq; + +static int revs_count; + +/* + * Some arguments are relevant "revision" arguments, + * others are about output format or other details. + * This sorts it all out. + */ +static int is_rev_argument(const char *arg) +{ + static const char *rev_args[] = { + "--all", + "--bisect", + "--dense", + "--branches", + "--header", + "--max-age=", + "--max-count=", + "--min-age=", + "--no-merges", + "--objects", + "--objects-edge", + "--parents", + "--pretty", + "--remotes", + "--sparse", + "--tags", + "--topo-order", + "--date-order", + "--unpacked", + NULL + }; + const char **p = rev_args; + + /* accept -<digit>, like traditional "head" */ + if ((*arg == '-') && isdigit(arg[1])) + return 1; + + for (;;) { + const char *str = *p++; + int len; + if (!str) + return 0; + len = strlen(str); + if (!strcmp(arg, str) || + (str[len-1] == '=' && !strncmp(arg, str, len))) + return 1; + } +} + +/* Output argument as a string, either SQ or normal */ +static void show(const char *arg) +{ + if (output_sq) { + int sq = '\'', ch; + + putchar(sq); + while ((ch = *arg++)) { + if (ch == sq) + fputs("'\\'", stdout); + putchar(ch); + } + putchar(sq); + putchar(' '); + } + else + puts(arg); +} + +/* Output a revision, only if filter allows it */ +static void show_rev(int type, const unsigned char *sha1, const char *name) +{ + if (!(filter & DO_REVS)) + return; + def = NULL; + revs_count++; + + if (type != show_type) + putchar('^'); + if (symbolic && name) + show(name); + else if (abbrev) + show(find_unique_abbrev(sha1, abbrev)); + else + show(sha1_to_hex(sha1)); +} + +/* Output a flag, only if filter allows it. */ +static int show_flag(const char *arg) +{ + if (!(filter & DO_FLAGS)) + return 0; + if (filter & (is_rev_argument(arg) ? DO_REVS : DO_NOREV)) { + show(arg); + return 1; + } + return 0; +} + +static void show_default(void) +{ + const char *s = def; + + if (s) { + unsigned char sha1[20]; + + def = NULL; + if (!get_sha1(s, sha1)) { + show_rev(NORMAL, sha1, s); + return; + } + } +} + +static int show_reference(const char *refname, const unsigned char *sha1, int flag, void *cb_data) +{ + show_rev(NORMAL, sha1, refname); + return 0; +} + +static void show_datestring(const char *flag, const char *datestr) +{ + static char buffer[100]; + + /* date handling requires both flags and revs */ + if ((filter & (DO_FLAGS | DO_REVS)) != (DO_FLAGS | DO_REVS)) + return; + snprintf(buffer, sizeof(buffer), "%s%lu", flag, approxidate(datestr)); + show(buffer); +} + +static int show_file(const char *arg) +{ + show_default(); + if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) { + show(arg); + return 1; + } + return 0; +} + +static int try_difference(const char *arg) +{ + char *dotdot; + unsigned char sha1[20]; + unsigned char end[20]; + const char *next; + const char *this; + int symmetric; + + if (!(dotdot = strstr(arg, ".."))) + return 0; + next = dotdot + 2; + this = arg; + symmetric = (*next == '.'); + + *dotdot = 0; + next += symmetric; + + if (!*next) + next = "HEAD"; + if (dotdot == arg) + this = "HEAD"; + if (!get_sha1(this, sha1) && !get_sha1(next, end)) { + show_rev(NORMAL, end, next); + show_rev(symmetric ? NORMAL : REVERSED, sha1, this); + if (symmetric) { + struct commit_list *exclude; + struct commit *a, *b; + a = lookup_commit_reference(sha1); + b = lookup_commit_reference(end); + exclude = get_merge_bases(a, b, 1); + while (exclude) { + struct commit_list *n = exclude->next; + show_rev(REVERSED, + exclude->item->object.sha1,NULL); + free(exclude); + exclude = n; + } + } + return 1; + } + *dotdot = '.'; + return 0; +} + +int cmd_rev_parse(int argc, const char **argv, const char *prefix) +{ + int i, as_is = 0, verify = 0; + unsigned char sha1[20]; + + git_config(git_default_config); + + for (i = 1; i < argc; i++) { + const char *arg = argv[i]; + + if (as_is) { + if (show_file(arg) && as_is < 2) + verify_filename(prefix, arg); + continue; + } + if (!strcmp(arg,"-n")) { + if (++i >= argc) + die("-n requires an argument"); + if ((filter & DO_FLAGS) && (filter & DO_REVS)) { + show(arg); + show(argv[i]); + } + continue; + } + if (!prefixcmp(arg, "-n")) { + if ((filter & DO_FLAGS) && (filter & DO_REVS)) + show(arg); + continue; + } + + if (*arg == '-') { + if (!strcmp(arg, "--")) { + as_is = 2; + /* Pass on the "--" if we show anything but files.. */ + if (filter & (DO_FLAGS | DO_REVS)) + show_file(arg); + continue; + } + if (!strcmp(arg, "--default")) { + def = argv[i+1]; + i++; + continue; + } + if (!strcmp(arg, "--revs-only")) { + filter &= ~DO_NOREV; + continue; + } + if (!strcmp(arg, "--no-revs")) { + filter &= ~DO_REVS; + continue; + } + if (!strcmp(arg, "--flags")) { + filter &= ~DO_NONFLAGS; + continue; + } + if (!strcmp(arg, "--no-flags")) { + filter &= ~DO_FLAGS; + continue; + } + if (!strcmp(arg, "--verify")) { + filter &= ~(DO_FLAGS|DO_NOREV); + verify = 1; + continue; + } + if (!strcmp(arg, "--short") || + !prefixcmp(arg, "--short=")) { + filter &= ~(DO_FLAGS|DO_NOREV); + verify = 1; + abbrev = DEFAULT_ABBREV; + if (arg[7] == '=') + abbrev = strtoul(arg + 8, NULL, 10); + if (abbrev < MINIMUM_ABBREV) + abbrev = MINIMUM_ABBREV; + else if (40 <= abbrev) + abbrev = 40; + continue; + } + if (!strcmp(arg, "--sq")) { + output_sq = 1; + continue; + } + if (!strcmp(arg, "--not")) { + show_type ^= REVERSED; + continue; + } + if (!strcmp(arg, "--symbolic")) { + symbolic = 1; + continue; + } + if (!strcmp(arg, "--all")) { + for_each_ref(show_reference, NULL); + continue; + } + if (!strcmp(arg, "--branches")) { + for_each_branch_ref(show_reference, NULL); + continue; + } + if (!strcmp(arg, "--tags")) { + for_each_tag_ref(show_reference, NULL); + continue; + } + if (!strcmp(arg, "--remotes")) { + for_each_remote_ref(show_reference, NULL); + continue; + } + if (!strcmp(arg, "--show-prefix")) { + if (prefix) + puts(prefix); + continue; + } + if (!strcmp(arg, "--show-cdup")) { + const char *pfx = prefix; + while (pfx) { + pfx = strchr(pfx, '/'); + if (pfx) { + pfx++; + printf("../"); + } + } + putchar('\n'); + continue; + } + if (!strcmp(arg, "--git-dir")) { + const char *gitdir = getenv(GIT_DIR_ENVIRONMENT); + static char cwd[PATH_MAX]; + if (gitdir) { + puts(gitdir); + continue; + } + if (!prefix) { + puts(".git"); + continue; + } + if (!getcwd(cwd, PATH_MAX)) + die("unable to get current working directory"); + printf("%s/.git\n", cwd); + continue; + } + if (!strcmp(arg, "--is-inside-git-dir")) { + printf("%s\n", is_inside_git_dir() ? "true" + : "false"); + continue; + } + if (!prefixcmp(arg, "--since=")) { + show_datestring("--max-age=", arg+8); + continue; + } + if (!prefixcmp(arg, "--after=")) { + show_datestring("--max-age=", arg+8); + continue; + } + if (!prefixcmp(arg, "--before=")) { + show_datestring("--min-age=", arg+9); + continue; + } + if (!prefixcmp(arg, "--until=")) { + show_datestring("--min-age=", arg+8); + continue; + } + if (show_flag(arg) && verify) + die("Needed a single revision"); + continue; + } + + /* Not a flag argument */ + if (try_difference(arg)) + continue; + if (!get_sha1(arg, sha1)) { + show_rev(NORMAL, sha1, arg); + continue; + } + if (*arg == '^' && !get_sha1(arg+1, sha1)) { + show_rev(REVERSED, sha1, arg+1); + continue; + } + as_is = 1; + if (!show_file(arg)) + continue; + if (verify) + die("Needed a single revision"); + verify_filename(prefix, arg); + } + show_default(); + if (verify && revs_count != 1) + die("Needed a single revision"); + return 0; +} |