зеркало из https://github.com/microsoft/git.git
152 строки
3.1 KiB
C
152 строки
3.1 KiB
C
#define _XOPEN_SOURCE /* glibc2 needs this */
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#define _BSD_SOURCE /* for tm.tm_gmtoff */
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#include <time.h>
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#include <ctype.h>
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#include "cache.h"
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#include "revision.h"
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/*
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* revision.h leaves the low 16 bits of the "flags" field of the
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* revision data structure unused. We use it for a "reachable from
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* this commit <N>" bitmask.
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*/
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#define MAX_COMMITS 16
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static int show_edges = 0;
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static int basemask = 0;
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static void read_cache_file(const char *path)
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{
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FILE *file = fopen(path, "r");
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char line[500];
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if (!file)
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die("bad revtree cache file (%s)", path);
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while (fgets(line, sizeof(line), file)) {
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unsigned long date;
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unsigned char sha1[20];
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struct revision *rev;
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const char *buf;
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if (sscanf(line, "%lu", &date) != 1)
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break;
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buf = strchr(line, ' ');
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if (!buf)
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break;
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if (get_sha1_hex(buf+1, sha1))
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break;
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rev = lookup_rev(sha1);
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rev->flags |= SEEN;
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rev->date = date;
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/* parents? */
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while ((buf = strchr(buf+1, ' ')) != NULL) {
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unsigned char parent[20];
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if (get_sha1_hex(buf + 1, parent))
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break;
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add_relationship(rev, parent);
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}
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}
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fclose(file);
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}
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/*
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* Some revisions are less interesting than others.
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*
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* For example, if we use a cache-file, that one may contain
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* revisions that were never used. They are never interesting.
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*
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* And sometimes we're only interested in "edge" commits, ie
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* places where the marking changes between parent and child.
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*/
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static int interesting(struct revision *rev)
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{
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unsigned mask = marked(rev);
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if (!mask)
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return 0;
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if (show_edges) {
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struct parent *p = rev->parent;
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while (p) {
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if (mask != marked(p->parent))
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return 1;
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p = p->next;
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}
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return 0;
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}
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if (mask & basemask)
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return 0;
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return 1;
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}
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/*
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* Usage: rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id2>]
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*
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* The cache-file can be quite important for big trees. This is an
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* expensive operation if you have to walk the whole chain of
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* parents in a tree with a long revision history.
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*/
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int main(int argc, char **argv)
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{
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int i;
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int nr = 0;
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unsigned char sha1[MAX_COMMITS][20];
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/*
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* First - pick up all the revisions we can (both from
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* caches and from commit file chains).
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*/
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for (i = 1; i < argc ; i++) {
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char *arg = argv[i];
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if (!strcmp(arg, "--cache")) {
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read_cache_file(argv[2]);
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i++;
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continue;
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}
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if (!strcmp(arg, "--edges")) {
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show_edges = 1;
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continue;
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}
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if (arg[0] == '^') {
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arg++;
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basemask |= 1<<nr;
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}
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if (nr >= MAX_COMMITS || get_sha1_hex(arg, sha1[nr]))
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usage("rev-tree [--edges] [--cache <cache-file>] <commit-id> [<commit-id>]");
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parse_commit(sha1[nr]);
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nr++;
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}
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/*
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* Now we have the maximal tree. Walk the different sha files back to the root.
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*/
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for (i = 0; i < nr; i++)
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mark_reachable(lookup_rev(sha1[i]), 1 << i);
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/*
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* Now print out the results..
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*/
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for (i = 0; i < nr_revs; i++) {
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struct revision *rev = revs[i];
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struct parent *p;
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if (!interesting(rev))
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continue;
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printf("%lu %s:%d", rev->date, sha1_to_hex(rev->sha1), marked(rev));
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p = rev->parent;
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while (p) {
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printf(" %s:%d", sha1_to_hex(p->parent->sha1), marked(p->parent));
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p = p->next;
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}
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printf("\n");
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}
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return 0;
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}
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