зеркало из https://github.com/microsoft/git.git
702 строки
15 KiB
C
702 строки
15 KiB
C
/*
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* Copyright (C) 2006, Fredrik Kuivinen <freku045@student.liu.se>
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*/
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#include <assert.h>
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#include <time.h>
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#include <sys/time.h>
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#include <math.h>
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#include "cache.h"
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#include "refs.h"
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#include "tag.h"
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#include "commit.h"
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#include "tree.h"
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#include "blob.h"
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#include "diff.h"
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#include "revision.h"
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#define DEBUG 0
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static const char blame_usage[] = "[-c] [-l] [--] file [commit]\n"
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" -c, --compability Use the same output mode as git-annotate (Default: off)\n"
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" -l, --long Show long commit SHA1 (Default: off)\n"
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" -h, --help This message";
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static struct commit **blame_lines;
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static int num_blame_lines;
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static char* blame_contents;
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static int blame_len;
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struct util_info {
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int *line_map;
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unsigned char sha1[20]; /* blob sha, not commit! */
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char *buf;
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unsigned long size;
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int num_lines;
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// const char* path;
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};
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struct chunk {
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int off1, len1; // ---
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int off2, len2; // +++
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};
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struct patch {
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struct chunk *chunks;
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int num;
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};
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static void get_blob(struct commit *commit);
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/* Only used for statistics */
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static int num_get_patch = 0;
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static int num_commits = 0;
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static int patch_time = 0;
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#define TEMPFILE_PATH_LEN 60
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static struct patch *get_patch(struct commit *commit, struct commit *other)
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{
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struct patch *ret;
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struct util_info *info_c = (struct util_info *)commit->object.util;
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struct util_info *info_o = (struct util_info *)other->object.util;
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char tmp_path1[TEMPFILE_PATH_LEN], tmp_path2[TEMPFILE_PATH_LEN];
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char diff_cmd[TEMPFILE_PATH_LEN*2 + 20];
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struct timeval tv_start, tv_end;
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int fd;
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FILE *fin;
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char buf[1024];
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ret = xmalloc(sizeof(struct patch));
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ret->chunks = NULL;
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ret->num = 0;
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get_blob(commit);
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get_blob(other);
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gettimeofday(&tv_start, NULL);
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fd = git_mkstemp(tmp_path1, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
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if (fd < 0)
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die("unable to create temp-file: %s", strerror(errno));
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if (xwrite(fd, info_c->buf, info_c->size) != info_c->size)
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die("write failed: %s", strerror(errno));
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close(fd);
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fd = git_mkstemp(tmp_path2, TEMPFILE_PATH_LEN, "git-blame-XXXXXX");
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if (fd < 0)
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die("unable to create temp-file: %s", strerror(errno));
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if (xwrite(fd, info_o->buf, info_o->size) != info_o->size)
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die("write failed: %s", strerror(errno));
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close(fd);
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sprintf(diff_cmd, "diff -u0 %s %s", tmp_path1, tmp_path2);
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fin = popen(diff_cmd, "r");
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if (!fin)
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die("popen failed: %s", strerror(errno));
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while (fgets(buf, sizeof(buf), fin)) {
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struct chunk *chunk;
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char *start, *sp;
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if (buf[0] != '@' || buf[1] != '@')
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continue;
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if (DEBUG)
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printf("chunk line: %s", buf);
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ret->num++;
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ret->chunks = xrealloc(ret->chunks,
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sizeof(struct chunk) * ret->num);
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chunk = &ret->chunks[ret->num - 1];
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assert(!strncmp(buf, "@@ -", 4));
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start = buf + 4;
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sp = index(start, ' ');
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*sp = '\0';
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if (index(start, ',')) {
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int ret =
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sscanf(start, "%d,%d", &chunk->off1, &chunk->len1);
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assert(ret == 2);
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} else {
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int ret = sscanf(start, "%d", &chunk->off1);
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assert(ret == 1);
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chunk->len1 = 1;
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}
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*sp = ' ';
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start = sp + 1;
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sp = index(start, ' ');
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*sp = '\0';
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if (index(start, ',')) {
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int ret =
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sscanf(start, "%d,%d", &chunk->off2, &chunk->len2);
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assert(ret == 2);
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} else {
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int ret = sscanf(start, "%d", &chunk->off2);
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assert(ret == 1);
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chunk->len2 = 1;
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}
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*sp = ' ';
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if (chunk->len1 == 0)
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chunk->off1++;
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if (chunk->len2 == 0)
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chunk->off2++;
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if (chunk->off1 > 0)
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chunk->off1--;
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if (chunk->off2 > 0)
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chunk->off2--;
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assert(chunk->off1 >= 0);
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assert(chunk->off2 >= 0);
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}
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pclose(fin);
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unlink(tmp_path1);
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unlink(tmp_path2);
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gettimeofday(&tv_end, NULL);
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patch_time += 1000000 * (tv_end.tv_sec - tv_start.tv_sec) +
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tv_end.tv_usec - tv_start.tv_usec;
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num_get_patch++;
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return ret;
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}
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static void free_patch(struct patch *p)
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{
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free(p->chunks);
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free(p);
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}
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static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
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int baselen, const char *pathname,
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unsigned mode, int stage);
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static unsigned char blob_sha1[20];
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static int get_blob_sha1(struct tree *t, const char *pathname,
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unsigned char *sha1)
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{
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int i;
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const char *pathspec[2];
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pathspec[0] = pathname;
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pathspec[1] = NULL;
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memset(blob_sha1, 0, sizeof(blob_sha1));
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read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
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for (i = 0; i < 20; i++) {
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if (blob_sha1[i] != 0)
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break;
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}
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if (i == 20)
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return -1;
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memcpy(sha1, blob_sha1, 20);
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return 0;
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}
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static int get_blob_sha1_internal(unsigned char *sha1, const char *base,
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int baselen, const char *pathname,
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unsigned mode, int stage)
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{
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if (S_ISDIR(mode))
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return READ_TREE_RECURSIVE;
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memcpy(blob_sha1, sha1, 20);
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return -1;
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}
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static void get_blob(struct commit *commit)
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{
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struct util_info *info = commit->object.util;
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char type[20];
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if (info->buf)
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return;
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info->buf = read_sha1_file(info->sha1, type, &info->size);
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assert(!strcmp(type, "blob"));
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}
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/* For debugging only */
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static void print_patch(struct patch *p)
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{
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int i;
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printf("Num chunks: %d\n", p->num);
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for (i = 0; i < p->num; i++) {
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printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1,
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p->chunks[i].off2, p->chunks[i].len2);
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}
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}
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#if 0
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/* For debugging only */
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static void print_map(struct commit *cmit, struct commit *other)
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{
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struct util_info *util = cmit->object.util;
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struct util_info *util2 = other->object.util;
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int i;
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int max =
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util->num_lines >
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util2->num_lines ? util->num_lines : util2->num_lines;
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int num;
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for (i = 0; i < max; i++) {
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printf("i: %d ", i);
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num = -1;
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if (i < util->num_lines) {
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num = util->line_map[i];
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printf("%d\t", num);
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} else
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printf("\t");
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if (i < util2->num_lines) {
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int num2 = util2->line_map[i];
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printf("%d\t", num2);
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if (num != -1 && num2 != num)
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printf("---");
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} else
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printf("\t");
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printf("\n");
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}
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}
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#endif
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// p is a patch from commit to other.
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static void fill_line_map(struct commit *commit, struct commit *other,
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struct patch *p)
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{
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struct util_info *util = commit->object.util;
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struct util_info *util2 = other->object.util;
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int *map = util->line_map;
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int *map2 = util2->line_map;
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int cur_chunk = 0;
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int i1, i2;
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if (p->num && DEBUG)
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print_patch(p);
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if (DEBUG)
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printf("num lines 1: %d num lines 2: %d\n", util->num_lines,
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util2->num_lines);
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for (i1 = 0, i2 = 0; i1 < util->num_lines; i1++, i2++) {
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struct chunk *chunk = NULL;
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if (cur_chunk < p->num)
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chunk = &p->chunks[cur_chunk];
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if (chunk && chunk->off1 == i1) {
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if (DEBUG && i2 != chunk->off2)
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printf("i2: %d off2: %d\n", i2, chunk->off2);
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assert(i2 == chunk->off2);
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i1--;
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i2--;
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if (chunk->len1 > 0)
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i1 += chunk->len1;
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if (chunk->len2 > 0)
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i2 += chunk->len2;
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cur_chunk++;
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} else {
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if (i2 >= util2->num_lines)
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break;
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if (map[i1] != map2[i2] && map[i1] != -1) {
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if (DEBUG)
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printf("map: i1: %d %d %p i2: %d %d %p\n",
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i1, map[i1],
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i1 != -1 ? blame_lines[map[i1]] : NULL,
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i2, map2[i2],
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i2 != -1 ? blame_lines[map2[i2]] : NULL);
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if (map2[i2] != -1 &&
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blame_lines[map[i1]] &&
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!blame_lines[map2[i2]])
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map[i1] = map2[i2];
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}
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if (map[i1] == -1 && map2[i2] != -1)
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map[i1] = map2[i2];
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}
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if (DEBUG > 1)
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printf("l1: %d l2: %d i1: %d i2: %d\n",
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map[i1], map2[i2], i1, i2);
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}
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}
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static int map_line(struct commit *commit, int line)
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{
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struct util_info *info = commit->object.util;
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assert(line >= 0 && line < info->num_lines);
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return info->line_map[line];
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}
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static int fill_util_info(struct commit *commit, const char *path)
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{
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struct util_info *util;
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if (commit->object.util)
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return 0;
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util = xmalloc(sizeof(struct util_info));
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if (get_blob_sha1(commit->tree, path, util->sha1)) {
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free(util);
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return 1;
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} else {
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util->buf = NULL;
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util->size = 0;
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util->line_map = NULL;
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util->num_lines = -1;
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commit->object.util = util;
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return 0;
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}
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}
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static void alloc_line_map(struct commit *commit)
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{
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struct util_info *util = commit->object.util;
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int i;
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if (util->line_map)
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return;
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get_blob(commit);
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util->num_lines = 0;
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for (i = 0; i < util->size; i++) {
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if (util->buf[i] == '\n')
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util->num_lines++;
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}
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if(util->buf[util->size - 1] != '\n')
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util->num_lines++;
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util->line_map = xmalloc(sizeof(int) * util->num_lines);
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for (i = 0; i < util->num_lines; i++)
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util->line_map[i] = -1;
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}
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static void init_first_commit(struct commit* commit, const char* filename)
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{
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struct util_info* util;
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int i;
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if (fill_util_info(commit, filename))
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die("fill_util_info failed");
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alloc_line_map(commit);
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util = commit->object.util;
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for (i = 0; i < util->num_lines; i++)
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util->line_map[i] = i;
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}
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static void process_commits(struct rev_info *rev, const char *path,
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struct commit** initial)
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{
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int i;
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struct util_info* util;
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int lines_left;
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int *blame_p;
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int *new_lines;
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int new_lines_len;
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struct commit* commit = get_revision(rev);
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assert(commit);
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init_first_commit(commit, path);
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util = commit->object.util;
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num_blame_lines = util->num_lines;
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blame_lines = xmalloc(sizeof(struct commit *) * num_blame_lines);
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blame_contents = util->buf;
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blame_len = util->size;
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for (i = 0; i < num_blame_lines; i++)
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blame_lines[i] = NULL;
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lines_left = num_blame_lines;
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blame_p = xmalloc(sizeof(int) * num_blame_lines);
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new_lines = xmalloc(sizeof(int) * num_blame_lines);
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do {
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struct commit_list *parents;
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int num_parents;
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struct util_info *util;
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if (DEBUG)
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printf("\nProcessing commit: %d %s\n", num_commits,
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sha1_to_hex(commit->object.sha1));
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if (lines_left == 0)
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return;
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num_commits++;
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memset(blame_p, 0, sizeof(int) * num_blame_lines);
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new_lines_len = 0;
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num_parents = 0;
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for (parents = commit->parents;
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parents != NULL; parents = parents->next)
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num_parents++;
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if(num_parents == 0)
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*initial = commit;
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if(fill_util_info(commit, path))
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continue;
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alloc_line_map(commit);
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util = commit->object.util;
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for (parents = commit->parents;
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parents != NULL; parents = parents->next) {
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struct commit *parent = parents->item;
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struct patch *patch;
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if (parse_commit(parent) < 0)
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die("parse_commit error");
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if (DEBUG)
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printf("parent: %s\n",
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sha1_to_hex(parent->object.sha1));
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if(fill_util_info(parent, path)) {
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num_parents--;
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continue;
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}
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patch = get_patch(parent, commit);
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alloc_line_map(parent);
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fill_line_map(parent, commit, patch);
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for (i = 0; i < patch->num; i++) {
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int l;
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for (l = 0; l < patch->chunks[i].len2; l++) {
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int mapped_line =
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map_line(commit, patch->chunks[i].off2 + l);
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if (mapped_line != -1) {
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blame_p[mapped_line]++;
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if (blame_p[mapped_line] == num_parents)
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new_lines[new_lines_len++] = mapped_line;
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}
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}
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}
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free_patch(patch);
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}
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if (DEBUG)
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printf("parents: %d\n", num_parents);
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for (i = 0; i < new_lines_len; i++) {
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int mapped_line = new_lines[i];
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if (blame_lines[mapped_line] == NULL) {
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blame_lines[mapped_line] = commit;
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lines_left--;
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if (DEBUG)
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printf("blame: mapped: %d i: %d\n",
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mapped_line, i);
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}
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}
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} while ((commit = get_revision(rev)) != NULL);
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}
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struct commit_info
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{
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char* author;
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char* author_mail;
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unsigned long author_time;
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char* author_tz;
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};
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static void get_commit_info(struct commit* commit, struct commit_info* ret)
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{
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int len;
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char* tmp;
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static char author_buf[1024];
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tmp = strstr(commit->buffer, "\nauthor ") + 8;
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len = index(tmp, '\n') - tmp;
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ret->author = author_buf;
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memcpy(ret->author, tmp, len);
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tmp = ret->author;
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tmp += len;
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*tmp = 0;
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while(*tmp != ' ')
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tmp--;
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ret->author_tz = tmp+1;
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*tmp = 0;
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while(*tmp != ' ')
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tmp--;
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ret->author_time = strtoul(tmp, NULL, 10);
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*tmp = 0;
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while(*tmp != ' ')
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tmp--;
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ret->author_mail = tmp + 1;
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*tmp = 0;
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}
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static const char* format_time(unsigned long time, const char* tz_str)
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{
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static char time_buf[128];
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time_t t = time;
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int minutes, tz;
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struct tm *tm;
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tz = atoi(tz_str);
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minutes = tz < 0 ? -tz : tz;
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minutes = (minutes / 100)*60 + (minutes % 100);
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minutes = tz < 0 ? -minutes : minutes;
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t = time + minutes * 60;
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tm = gmtime(&t);
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strftime(time_buf, sizeof(time_buf), "%Y-%m-%d %H:%M:%S ", tm);
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strcat(time_buf, tz_str);
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return time_buf;
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}
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int main(int argc, const char **argv)
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{
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int i;
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struct commit *initial = NULL;
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unsigned char sha1[20];
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const char *filename = NULL, *commit = NULL;
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char filename_buf[256];
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int sha1_len = 8;
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int compability = 0;
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int options = 1;
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int num_args;
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const char* args[10];
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struct rev_info rev;
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|
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struct commit_info ci;
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const char *buf;
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int max_digits;
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|
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const char* prefix = setup_git_directory();
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|
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for(i = 1; i < argc; i++) {
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if(options) {
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if(!strcmp(argv[i], "-h") ||
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!strcmp(argv[i], "--help"))
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usage(blame_usage);
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else if(!strcmp(argv[i], "-l") ||
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!strcmp(argv[i], "--long")) {
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sha1_len = 40;
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continue;
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} else if(!strcmp(argv[i], "-c") ||
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!strcmp(argv[i], "--compability")) {
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compability = 1;
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continue;
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|
} else if(!strcmp(argv[i], "--")) {
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options = 0;
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|
continue;
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|
} else if(argv[i][0] == '-')
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usage(blame_usage);
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else
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options = 0;
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}
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|
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|
if(!options) {
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if(!filename)
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filename = argv[i];
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else if(!commit)
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|
commit = argv[i];
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else
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usage(blame_usage);
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}
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}
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|
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if(!filename)
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|
usage(blame_usage);
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if(!commit)
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commit = "HEAD";
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|
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if(prefix)
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sprintf(filename_buf, "%s%s", prefix, filename);
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else
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strcpy(filename_buf, filename);
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filename = filename_buf;
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|
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|
{
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|
struct commit* c;
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|
if (get_sha1(commit, sha1))
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die("get_sha1 failed, commit '%s' not found", commit);
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c = lookup_commit_reference(sha1);
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|
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if (fill_util_info(c, filename)) {
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|
printf("%s not found in %s\n", filename, commit);
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|
return 1;
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|
}
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|
}
|
|
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|
num_args = 0;
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|
args[num_args++] = NULL;
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|
args[num_args++] = "--topo-order";
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|
args[num_args++] = "--remove-empty";
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|
args[num_args++] = commit;
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|
args[num_args++] = "--";
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|
args[num_args++] = filename;
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|
args[num_args] = NULL;
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|
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|
setup_revisions(num_args, args, &rev, "HEAD");
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|
prepare_revision_walk(&rev);
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|
process_commits(&rev, filename, &initial);
|
|
|
|
buf = blame_contents;
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|
for (max_digits = 1, i = 10; i <= num_blame_lines + 1; max_digits++)
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|
i *= 10;
|
|
|
|
for (i = 0; i < num_blame_lines; i++) {
|
|
struct commit *c = blame_lines[i];
|
|
if (!c)
|
|
c = initial;
|
|
|
|
get_commit_info(c, &ci);
|
|
fwrite(sha1_to_hex(c->object.sha1), sha1_len, 1, stdout);
|
|
if(compability)
|
|
printf("\t(%10s\t%10s\t%d)", ci.author,
|
|
format_time(ci.author_time, ci.author_tz), i+1);
|
|
else
|
|
printf(" (%-15.15s %10s %*d) ", ci.author,
|
|
format_time(ci.author_time, ci.author_tz),
|
|
max_digits, i+1);
|
|
|
|
if(i == num_blame_lines - 1) {
|
|
fwrite(buf, blame_len - (buf - blame_contents),
|
|
1, stdout);
|
|
if(blame_contents[blame_len-1] != '\n')
|
|
putc('\n', stdout);
|
|
} else {
|
|
char* next_buf = index(buf, '\n') + 1;
|
|
fwrite(buf, next_buf - buf, 1, stdout);
|
|
buf = next_buf;
|
|
}
|
|
}
|
|
|
|
if (DEBUG) {
|
|
printf("num get patch: %d\n", num_get_patch);
|
|
printf("num commits: %d\n", num_commits);
|
|
printf("patch time: %f\n", patch_time / 1000000.0);
|
|
printf("initial: %s\n", sha1_to_hex(initial->object.sha1));
|
|
}
|
|
|
|
return 0;
|
|
}
|