mirror of
https://github.com/git/git.git
synced 2024-11-24 18:33:43 +08:00
6b6dcfc297
Signed-off-by: Fredrik Kuivinen <freku045@student.liu.se> Signed-off-by: Junio C Hamano <junkio@cox.net>
692 lines
15 KiB
C
692 lines
15 KiB
C
#include "cache.h"
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#include "tag.h"
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#include "commit.h"
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int save_commit_buffer = 1;
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struct sort_node
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{
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/*
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* the number of children of the associated commit
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* that also occur in the list being sorted.
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*/
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unsigned int indegree;
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/*
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* reference to original list item that we will re-use
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* on output.
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*/
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struct commit_list * list_item;
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};
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const char *commit_type = "commit";
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enum cmit_fmt get_commit_format(const char *arg)
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{
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if (!*arg)
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return CMIT_FMT_DEFAULT;
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if (!strcmp(arg, "=raw"))
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return CMIT_FMT_RAW;
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if (!strcmp(arg, "=medium"))
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return CMIT_FMT_MEDIUM;
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if (!strcmp(arg, "=short"))
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return CMIT_FMT_SHORT;
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if (!strcmp(arg, "=full"))
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return CMIT_FMT_FULL;
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if (!strcmp(arg, "=fuller"))
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return CMIT_FMT_FULLER;
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if (!strcmp(arg, "=oneline"))
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return CMIT_FMT_ONELINE;
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die("invalid --pretty format");
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}
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static struct commit *check_commit(struct object *obj,
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const unsigned char *sha1,
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int quiet)
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{
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if (obj->type != commit_type) {
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if (!quiet)
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error("Object %s is a %s, not a commit",
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sha1_to_hex(sha1), obj->type);
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return NULL;
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}
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return (struct commit *) obj;
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}
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struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
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int quiet)
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{
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struct object *obj = deref_tag(parse_object(sha1), NULL, 0);
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if (!obj)
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return NULL;
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return check_commit(obj, sha1, quiet);
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}
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struct commit *lookup_commit_reference(const unsigned char *sha1)
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{
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return lookup_commit_reference_gently(sha1, 0);
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}
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struct commit *lookup_commit(const unsigned char *sha1)
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{
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struct object *obj = lookup_object(sha1);
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if (!obj) {
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struct commit *ret = xmalloc(sizeof(struct commit));
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memset(ret, 0, sizeof(struct commit));
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created_object(sha1, &ret->object);
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ret->object.type = commit_type;
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return ret;
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}
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if (!obj->type)
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obj->type = commit_type;
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return check_commit(obj, sha1, 0);
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}
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static unsigned long parse_commit_date(const char *buf)
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{
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unsigned long date;
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if (memcmp(buf, "author", 6))
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return 0;
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while (*buf++ != '\n')
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/* nada */;
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if (memcmp(buf, "committer", 9))
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return 0;
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while (*buf++ != '>')
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/* nada */;
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date = strtoul(buf, NULL, 10);
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if (date == ULONG_MAX)
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date = 0;
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return date;
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}
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static struct commit_graft {
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unsigned char sha1[20];
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int nr_parent;
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unsigned char parent[0][20]; /* more */
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} **commit_graft;
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static int commit_graft_alloc, commit_graft_nr;
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static int commit_graft_pos(const unsigned char *sha1)
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{
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int lo, hi;
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lo = 0;
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hi = commit_graft_nr;
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while (lo < hi) {
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int mi = (lo + hi) / 2;
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struct commit_graft *graft = commit_graft[mi];
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int cmp = memcmp(sha1, graft->sha1, 20);
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if (!cmp)
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return mi;
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if (cmp < 0)
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hi = mi;
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else
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lo = mi + 1;
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}
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return -lo - 1;
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}
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static void prepare_commit_graft(void)
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{
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char *graft_file = get_graft_file();
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FILE *fp = fopen(graft_file, "r");
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char buf[1024];
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if (!fp) {
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commit_graft = (struct commit_graft **) "hack";
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return;
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}
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while (fgets(buf, sizeof(buf), fp)) {
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/* The format is just "Commit Parent1 Parent2 ...\n" */
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int len = strlen(buf);
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int i;
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struct commit_graft *graft = NULL;
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if (buf[len-1] == '\n')
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buf[--len] = 0;
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if (buf[0] == '#')
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continue;
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if ((len + 1) % 41) {
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bad_graft_data:
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error("bad graft data: %s", buf);
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free(graft);
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continue;
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}
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i = (len + 1) / 41 - 1;
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graft = xmalloc(sizeof(*graft) + 20 * i);
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graft->nr_parent = i;
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if (get_sha1_hex(buf, graft->sha1))
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goto bad_graft_data;
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for (i = 40; i < len; i += 41) {
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if (buf[i] != ' ')
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goto bad_graft_data;
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if (get_sha1_hex(buf + i + 1, graft->parent[i/41]))
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goto bad_graft_data;
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}
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i = commit_graft_pos(graft->sha1);
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if (0 <= i) {
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error("duplicate graft data: %s", buf);
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free(graft);
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continue;
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}
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i = -i - 1;
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if (commit_graft_alloc <= ++commit_graft_nr) {
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commit_graft_alloc = alloc_nr(commit_graft_alloc);
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commit_graft = xrealloc(commit_graft,
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sizeof(*commit_graft) *
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commit_graft_alloc);
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}
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if (i < commit_graft_nr)
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memmove(commit_graft + i + 1,
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commit_graft + i,
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(commit_graft_nr - i - 1) *
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sizeof(*commit_graft));
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commit_graft[i] = graft;
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}
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fclose(fp);
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}
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static struct commit_graft *lookup_commit_graft(const unsigned char *sha1)
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{
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int pos;
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if (!commit_graft)
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prepare_commit_graft();
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pos = commit_graft_pos(sha1);
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if (pos < 0)
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return NULL;
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return commit_graft[pos];
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}
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int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size)
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{
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char *bufptr = buffer;
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unsigned char parent[20];
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struct commit_list **pptr;
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struct commit_graft *graft;
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unsigned n_refs = 0;
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if (item->object.parsed)
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return 0;
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item->object.parsed = 1;
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if (memcmp(bufptr, "tree ", 5))
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return error("bogus commit object %s", sha1_to_hex(item->object.sha1));
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if (get_sha1_hex(bufptr + 5, parent) < 0)
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return error("bad tree pointer in commit %s",
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sha1_to_hex(item->object.sha1));
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item->tree = lookup_tree(parent);
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if (item->tree)
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n_refs++;
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bufptr += 46; /* "tree " + "hex sha1" + "\n" */
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pptr = &item->parents;
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graft = lookup_commit_graft(item->object.sha1);
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while (!memcmp(bufptr, "parent ", 7)) {
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struct commit *new_parent;
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if (get_sha1_hex(bufptr + 7, parent) || bufptr[47] != '\n')
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return error("bad parents in commit %s", sha1_to_hex(item->object.sha1));
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bufptr += 48;
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if (graft)
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continue;
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new_parent = lookup_commit(parent);
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if (new_parent) {
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pptr = &commit_list_insert(new_parent, pptr)->next;
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n_refs++;
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}
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}
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if (graft) {
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int i;
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struct commit *new_parent;
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for (i = 0; i < graft->nr_parent; i++) {
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new_parent = lookup_commit(graft->parent[i]);
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if (!new_parent)
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continue;
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pptr = &commit_list_insert(new_parent, pptr)->next;
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n_refs++;
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}
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}
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item->date = parse_commit_date(bufptr);
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if (track_object_refs) {
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unsigned i = 0;
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struct commit_list *p;
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struct object_refs *refs = alloc_object_refs(n_refs);
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if (item->tree)
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refs->ref[i++] = &item->tree->object;
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for (p = item->parents; p; p = p->next)
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refs->ref[i++] = &p->item->object;
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set_object_refs(&item->object, refs);
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}
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return 0;
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}
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int parse_commit(struct commit *item)
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{
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char type[20];
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void *buffer;
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unsigned long size;
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int ret;
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if (item->object.parsed)
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return 0;
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buffer = read_sha1_file(item->object.sha1, type, &size);
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if (!buffer)
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return error("Could not read %s",
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sha1_to_hex(item->object.sha1));
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if (strcmp(type, commit_type)) {
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free(buffer);
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return error("Object %s not a commit",
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sha1_to_hex(item->object.sha1));
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}
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ret = parse_commit_buffer(item, buffer, size);
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if (save_commit_buffer && !ret) {
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item->buffer = buffer;
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return 0;
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}
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free(buffer);
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return ret;
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}
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struct commit_list *commit_list_insert(struct commit *item, struct commit_list **list_p)
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{
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struct commit_list *new_list = xmalloc(sizeof(struct commit_list));
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new_list->item = item;
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new_list->next = *list_p;
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*list_p = new_list;
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return new_list;
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}
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void free_commit_list(struct commit_list *list)
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{
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while (list) {
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struct commit_list *temp = list;
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list = temp->next;
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free(temp);
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}
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}
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struct commit_list * insert_by_date(struct commit *item, struct commit_list **list)
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{
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struct commit_list **pp = list;
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struct commit_list *p;
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while ((p = *pp) != NULL) {
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if (p->item->date < item->date) {
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break;
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}
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pp = &p->next;
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}
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return commit_list_insert(item, pp);
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}
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void sort_by_date(struct commit_list **list)
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{
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struct commit_list *ret = NULL;
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while (*list) {
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insert_by_date((*list)->item, &ret);
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*list = (*list)->next;
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}
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*list = ret;
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}
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struct commit *pop_most_recent_commit(struct commit_list **list,
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unsigned int mark)
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{
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struct commit *ret = (*list)->item;
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struct commit_list *parents = ret->parents;
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struct commit_list *old = *list;
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*list = (*list)->next;
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free(old);
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while (parents) {
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struct commit *commit = parents->item;
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parse_commit(commit);
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if (!(commit->object.flags & mark)) {
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commit->object.flags |= mark;
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insert_by_date(commit, list);
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}
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parents = parents->next;
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}
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return ret;
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}
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void clear_commit_marks(struct commit *commit, unsigned int mark)
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{
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struct commit_list *parents;
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parents = commit->parents;
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commit->object.flags &= ~mark;
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while (parents) {
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struct commit *parent = parents->item;
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if (parent && parent->object.parsed &&
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(parent->object.flags & mark))
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clear_commit_marks(parent, mark);
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parents = parents->next;
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}
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}
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/*
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* Generic support for pretty-printing the header
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*/
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static int get_one_line(const char *msg, unsigned long len)
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{
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int ret = 0;
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while (len--) {
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char c = *msg++;
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ret++;
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if (c == '\n')
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break;
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if (!c)
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return 0;
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}
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return ret;
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}
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static int add_user_info(const char *what, enum cmit_fmt fmt, char *buf, const char *line)
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{
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char *date;
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int namelen;
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unsigned long time;
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int tz, ret;
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const char *filler = " ";
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if (fmt == CMIT_FMT_ONELINE)
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return 0;
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date = strchr(line, '>');
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if (!date)
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return 0;
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namelen = ++date - line;
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time = strtoul(date, &date, 10);
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tz = strtol(date, NULL, 10);
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ret = sprintf(buf, "%s: %.*s%.*s\n", what,
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(fmt == CMIT_FMT_FULLER) ? 4 : 0,
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filler, namelen, line);
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switch (fmt) {
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case CMIT_FMT_MEDIUM:
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ret += sprintf(buf + ret, "Date: %s\n", show_date(time, tz));
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break;
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case CMIT_FMT_FULLER:
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ret += sprintf(buf + ret, "%sDate: %s\n", what, show_date(time, tz));
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break;
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default:
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/* notin' */
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break;
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}
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return ret;
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}
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static int is_empty_line(const char *line, int len)
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{
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while (len && isspace(line[len-1]))
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len--;
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return !len;
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}
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static int add_merge_info(enum cmit_fmt fmt, char *buf, const struct commit *commit, int abbrev)
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{
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struct commit_list *parent = commit->parents;
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int offset;
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if ((fmt == CMIT_FMT_ONELINE) || !parent || !parent->next)
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return 0;
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offset = sprintf(buf, "Merge:");
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while (parent) {
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struct commit *p = parent->item;
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const char *hex = abbrev
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? find_unique_abbrev(p->object.sha1, abbrev)
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: sha1_to_hex(p->object.sha1);
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char *dots = (abbrev && strlen(hex) != 40) ? "..." : "";
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parent = parent->next;
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offset += sprintf(buf + offset, " %s%s", hex, dots);
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}
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buf[offset++] = '\n';
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return offset;
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}
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unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *commit, unsigned long len, char *buf, unsigned long space, int abbrev)
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{
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int hdr = 1, body = 0;
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unsigned long offset = 0;
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int indent = (fmt == CMIT_FMT_ONELINE) ? 0 : 4;
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int parents_shown = 0;
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const char *msg = commit->buffer;
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for (;;) {
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const char *line = msg;
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int linelen = get_one_line(msg, len);
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if (!linelen)
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break;
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/*
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* We want some slop for indentation and a possible
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* final "...". Thus the "+ 20".
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*/
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if (offset + linelen + 20 > space) {
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memcpy(buf + offset, " ...\n", 8);
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offset += 8;
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break;
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}
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msg += linelen;
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len -= linelen;
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if (hdr) {
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if (linelen == 1) {
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hdr = 0;
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if (fmt != CMIT_FMT_ONELINE)
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buf[offset++] = '\n';
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continue;
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}
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if (fmt == CMIT_FMT_RAW) {
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memcpy(buf + offset, line, linelen);
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offset += linelen;
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continue;
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}
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if (!memcmp(line, "parent ", 7)) {
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if (linelen != 48)
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die("bad parent line in commit");
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continue;
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}
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if (!parents_shown) {
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offset += add_merge_info(fmt, buf + offset,
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commit, abbrev);
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parents_shown = 1;
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continue;
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}
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/*
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* MEDIUM == DEFAULT shows only author with dates.
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* FULL shows both authors but not dates.
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* FULLER shows both authors and dates.
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*/
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if (!memcmp(line, "author ", 7))
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offset += add_user_info("Author", fmt,
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buf + offset,
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line + 7);
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if (!memcmp(line, "committer ", 10) &&
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(fmt == CMIT_FMT_FULL || fmt == CMIT_FMT_FULLER))
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offset += add_user_info("Commit", fmt,
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buf + offset,
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line + 10);
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continue;
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}
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if (is_empty_line(line, linelen)) {
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if (!body)
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continue;
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if (fmt == CMIT_FMT_SHORT)
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break;
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} else {
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body = 1;
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}
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memset(buf + offset, ' ', indent);
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memcpy(buf + offset + indent, line, linelen);
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offset += linelen + indent;
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if (fmt == CMIT_FMT_ONELINE)
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break;
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}
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if (fmt == CMIT_FMT_ONELINE) {
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/* We do not want the terminating newline */
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if (buf[offset - 1] == '\n')
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offset--;
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}
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else {
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/* Make sure there is an EOLN */
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if (buf[offset - 1] != '\n')
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buf[offset++] = '\n';
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}
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buf[offset] = '\0';
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return offset;
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}
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struct commit *pop_commit(struct commit_list **stack)
|
|
{
|
|
struct commit_list *top = *stack;
|
|
struct commit *item = top ? top->item : NULL;
|
|
|
|
if (top) {
|
|
*stack = top->next;
|
|
free(top);
|
|
}
|
|
return item;
|
|
}
|
|
|
|
int count_parents(struct commit * commit)
|
|
{
|
|
int count = 0;
|
|
struct commit_list * parents = commit->parents;
|
|
for (count=0;parents; parents=parents->next,count++)
|
|
;
|
|
return count;
|
|
}
|
|
|
|
void topo_sort_default_setter(struct commit *c, void *data)
|
|
{
|
|
c->object.util = data;
|
|
}
|
|
|
|
void *topo_sort_default_getter(struct commit *c)
|
|
{
|
|
return c->object.util;
|
|
}
|
|
|
|
/*
|
|
* Performs an in-place topological sort on the list supplied.
|
|
*/
|
|
void sort_in_topological_order(struct commit_list ** list, int lifo)
|
|
{
|
|
sort_in_topological_order_fn(list, lifo, topo_sort_default_setter,
|
|
topo_sort_default_getter);
|
|
}
|
|
|
|
void sort_in_topological_order_fn(struct commit_list ** list, int lifo,
|
|
topo_sort_set_fn_t setter,
|
|
topo_sort_get_fn_t getter)
|
|
{
|
|
struct commit_list * next = *list;
|
|
struct commit_list * work = NULL, **insert;
|
|
struct commit_list ** pptr = list;
|
|
struct sort_node * nodes;
|
|
struct sort_node * next_nodes;
|
|
int count = 0;
|
|
|
|
/* determine the size of the list */
|
|
while (next) {
|
|
next = next->next;
|
|
count++;
|
|
}
|
|
|
|
if (!count)
|
|
return;
|
|
/* allocate an array to help sort the list */
|
|
nodes = xcalloc(count, sizeof(*nodes));
|
|
/* link the list to the array */
|
|
next_nodes = nodes;
|
|
next=*list;
|
|
while (next) {
|
|
next_nodes->list_item = next;
|
|
setter(next->item, next_nodes);
|
|
next_nodes++;
|
|
next = next->next;
|
|
}
|
|
/* update the indegree */
|
|
next=*list;
|
|
while (next) {
|
|
struct commit_list * parents = next->item->parents;
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *) getter(parent);
|
|
|
|
if (pn)
|
|
pn->indegree++;
|
|
parents=parents->next;
|
|
}
|
|
next=next->next;
|
|
}
|
|
/*
|
|
* find the tips
|
|
*
|
|
* tips are nodes not reachable from any other node in the list
|
|
*
|
|
* the tips serve as a starting set for the work queue.
|
|
*/
|
|
next=*list;
|
|
insert = &work;
|
|
while (next) {
|
|
struct sort_node * node = (struct sort_node *) getter(next->item);
|
|
|
|
if (node->indegree == 0) {
|
|
insert = &commit_list_insert(next->item, insert)->next;
|
|
}
|
|
next=next->next;
|
|
}
|
|
|
|
/* process the list in topological order */
|
|
if (!lifo)
|
|
sort_by_date(&work);
|
|
while (work) {
|
|
struct commit * work_item = pop_commit(&work);
|
|
struct sort_node * work_node = (struct sort_node *) getter(work_item);
|
|
struct commit_list * parents = work_item->parents;
|
|
|
|
while (parents) {
|
|
struct commit * parent=parents->item;
|
|
struct sort_node * pn = (struct sort_node *) getter(parent);
|
|
|
|
if (pn) {
|
|
/*
|
|
* parents are only enqueued for emission
|
|
* when all their children have been emitted thereby
|
|
* guaranteeing topological order.
|
|
*/
|
|
pn->indegree--;
|
|
if (!pn->indegree) {
|
|
if (!lifo)
|
|
insert_by_date(parent, &work);
|
|
else
|
|
commit_list_insert(parent, &work);
|
|
}
|
|
}
|
|
parents=parents->next;
|
|
}
|
|
/*
|
|
* work_item is a commit all of whose children
|
|
* have already been emitted. we can emit it now.
|
|
*/
|
|
*pptr = work_node->list_item;
|
|
pptr = &(*pptr)->next;
|
|
*pptr = NULL;
|
|
setter(work_item, NULL);
|
|
}
|
|
free(nodes);
|
|
}
|