From: Junio C Hamano <junkio@cox.net>
Date: Thu, 2 Mar 2006 23:10:05 +0000 (-0800)
Subject: Merge part of 'lt/rev-list' into 'fk/blame'
X-Git-Tag: v1.3.0-rc1~56^2~1
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=c40610422e1157e71dbc3c1a2f9e19bbe117962f;p=git.git

Merge part of 'lt/rev-list' into 'fk/blame'

Now blame will depend on the new revision walker infrastructure,
we need to make it depend on earlier parts of Linus' rev-list
topic branch, hence this merge.

Signed-off-by: Junio C Hamano <junkio@cox.net>
---

c40610422e1157e71dbc3c1a2f9e19bbe117962f
diff --cc blame.c
index 1e655466a,000000000..dbce7e2c5
mode 100644,000000..100644
--- a/blame.c
+++ b/blame.c
@@@ -1,443 -1,0 +1,442 @@@
 +#include <assert.h>
 +
 +#include "cache.h"
 +#include "refs.h"
 +#include "tag.h"
 +#include "commit.h"
 +#include "tree.h"
 +#include "blob.h"
- #include "epoch.h"
 +#include "diff.h"
 +
 +#define DEBUG 0
 +
 +struct commit** blame_lines;
 +int num_blame_lines;
 +
 +struct util_info
 +{
 +    int* line_map;
 +    int num_lines;
 +    unsigned char sha1[20]; /* blob sha, not commit! */
 +    char* buf;
 +    unsigned long size;
 +//    const char* path;
 +};
 +
 +struct chunk
 +{
 +    int off1, len1; // ---
 +    int off2, len2; // +++
 +};
 +
 +struct patch
 +{
 +    struct chunk* chunks;
 +    int num;
 +};
 +
 +static void get_blob(struct commit* commit);
 +
 +int num_get_patch = 0;
 +int num_commits = 0;
 +
 +struct patch* get_patch(struct commit* commit, struct commit* other)
 +{
 +    struct patch* ret = xmalloc(sizeof(struct patch));
 +    ret->chunks = NULL;
 +    ret->num = 0;
 +
 +    struct util_info* info_c = (struct util_info*) commit->object.util;
 +    struct util_info* info_o = (struct util_info*) other->object.util;
 +
 +    if(!memcmp(info_c->sha1, info_o->sha1, 20))
 +        return ret;
 +
 +    get_blob(commit);
 +    get_blob(other);
 +
 +    FILE* fout = fopen("/tmp/git-blame-tmp1", "w");
 +    if(!fout)
 +        die("fopen tmp1 failed: %s", strerror(errno));
 +
 +    if(fwrite(info_c->buf, info_c->size, 1, fout) != 1)
 +        die("fwrite 1 failed: %s", strerror(errno));
 +    fclose(fout);
 +
 +    fout = fopen("/tmp/git-blame-tmp2", "w");
 +    if(!fout)
 +        die("fopen tmp2 failed: %s", strerror(errno));
 +
 +    if(fwrite(info_o->buf, info_o->size, 1, fout) != 1)
 +        die("fwrite 2 failed: %s", strerror(errno));
 +    fclose(fout);
 +
 +    FILE* fin = popen("diff -u0 /tmp/git-blame-tmp1 /tmp/git-blame-tmp2", "r");
 +    if(!fin)
 +        die("popen failed: %s", strerror(errno));
 +
 +    char buf[1024];
 +    while(fgets(buf, sizeof(buf), fin)) {
 +        if(buf[0] != '@' || buf[1] != '@')
 +            continue;
 +
 +        if(DEBUG)
 +            printf("chunk line: %s", buf);
 +        ret->num++;
 +        ret->chunks = xrealloc(ret->chunks, sizeof(struct chunk)*ret->num);
 +        struct chunk* chunk = &ret->chunks[ret->num-1];
 +
 +        assert(!strncmp(buf, "@@ -", 4));
 +
 +        char* start = buf+4;
 +        char* sp = index(start, ' ');
 +        *sp = '\0';
 +        if(index(start, ',')) {
 +            int ret = sscanf(start, "%d,%d", &chunk->off1, &chunk->len1);
 +            assert(ret == 2);
 +        } else {
 +            int ret = sscanf(start, "%d", &chunk->off1);
 +            assert(ret == 1);
 +            chunk->len1 = 1;
 +        }
 +        *sp = ' ';
 +
 +        start = sp+1;
 +        sp = index(start, ' ');
 +        *sp = '\0';
 +        if(index(start, ',')) {
 +            int ret = sscanf(start, "%d,%d", &chunk->off2, &chunk->len2);
 +            assert(ret == 2);
 +        } else {
 +            int ret = sscanf(start, "%d", &chunk->off2);
 +            assert(ret == 1);
 +            chunk->len2 = 1;
 +        }
 +        *sp = ' ';
 +
 +        if(chunk->off1 > 0)
 +            chunk->off1 -= 1;
 +        if(chunk->off2 > 0)
 +            chunk->off2 -= 1;
 +
 +        assert(chunk->off1 >= 0);
 +        assert(chunk->off2 >= 0);
 +    }
 +    fclose(fin);
 +
 +    num_get_patch++;
 +    return ret;
 +}
 +
 +void free_patch(struct patch* p)
 +{
 +    free(p->chunks);
 +    free(p);
 +}
 +
 +static int get_blob_sha1_internal(unsigned char *sha1, const char *base, int baselen,
 +                                  const char *pathname, unsigned mode, int stage);
 +
 +
 +static unsigned char blob_sha1[20];
 +static int get_blob_sha1(struct tree* t, const char* pathname, unsigned char* sha1)
 +{
 +    const char *pathspec[2];
 +    pathspec[0] = pathname;
 +    pathspec[1] = NULL;
 +    memset(blob_sha1, 0, sizeof(blob_sha1));
 +    read_tree_recursive(t, "", 0, 0, pathspec, get_blob_sha1_internal);
 +
 +    int i;
 +    for(i = 0; i < 20; i++) {
 +        if(blob_sha1[i] != 0)
 +            break;
 +    }
 +
 +    if(i == 20)
 +        return -1;
 +
 +    memcpy(sha1, blob_sha1, 20);
 +    return 0;
 +}
 +
 +static int get_blob_sha1_internal(unsigned char *sha1, const char *base, int baselen,
 +                                  const char *pathname, unsigned mode, int stage)
 +{
 +//    printf("Got blob: %s base: '%s' baselen: %d pathname: '%s' mode: %o stage: %d\n",
 +//           sha1_to_hex(sha1), base, baselen, pathname, mode, stage);
 +
 +    if(S_ISDIR(mode))
 +        return READ_TREE_RECURSIVE;
 +
 +    memcpy(blob_sha1, sha1, 20);
 +    return -1;
 +}
 +
 +static void get_blob(struct commit* commit)
 +{
 +    struct util_info* info = commit->object.util;
 +    char type[20];
 +
 +    if(info->buf)
 +        return;
 +
 +    info->buf = read_sha1_file(info->sha1, type, &info->size);
 +    assert(!strcmp(type, "blob"));
 +}
 +
 +void print_patch(struct patch* p)
 +{
 +    printf("Num chunks: %d\n", p->num);
 +    int i;
 +    for(i = 0; i < p->num; i++) {
 +        printf("%d,%d %d,%d\n", p->chunks[i].off1, p->chunks[i].len1, p->chunks[i].off2, p->chunks[i].len2);
 +    }
 +}
 +
 +
 +// p is a patch from commit to other.
 +void fill_line_map(struct commit* commit, struct commit* other, struct patch* p)
 +{
 +    int num_lines = ((struct util_info*) commit->object.util)->num_lines;
 +    int* line_map = ((struct util_info*) commit->object.util)->line_map;
 +    int num_lines2 = ((struct util_info*) other->object.util)->num_lines;
 +    int* line_map2 = ((struct util_info*) other->object.util)->line_map;
 +    int cur_chunk = 0;
 +    int i1, i2;
 +
 +    if(p->num && DEBUG)
 +        print_patch(p);
 +
 +    for(i1 = 0; i1 < num_lines; i1++)
 +        line_map[i1] = -1;
 +
 +    if(DEBUG)
 +        printf("num lines 1: %d num lines 2: %d\n", num_lines, num_lines2);
 +
 +    for(i1 = 0, i2 = 0; i1 < num_lines; i1++, i2++) {
 +        if(DEBUG > 1)
 +            printf("%d %d\n", i1, i2);
 +
 +        if(i2 >= num_lines2)
 +            break;
 +
 +        line_map[i1] = line_map2[i2];
 +
 +        struct chunk* chunk = NULL;
 +        if(cur_chunk < p->num)
 +            chunk = &p->chunks[cur_chunk];
 +
 +        if(chunk && chunk->off1 == i1) {
 +            i2 = chunk->off2;
 +
 +            if(chunk->len1 > 0)
 +                i1 += chunk->len1-1;
 +            if(chunk->len2 > 0)
 +                i2 += chunk->len2-1;
 +            cur_chunk++;
 +        }
 +    }
 +}
 +
 +int map_line(struct commit* commit, int line)
 +{
 +    struct util_info* info = commit->object.util;
 +    assert(line >= 0 && line < info->num_lines);
 +    return info->line_map[line];
 +}
 +
 +int fill_util_info(struct commit* commit, const char* path)
 +{
 +    if(commit->object.util)
 +        return 0;
 +
 +    struct util_info* util = xmalloc(sizeof(struct util_info));
 +    util->buf = NULL;
 +    util->size = 0;
 +    util->num_lines = -1;
 +    util->line_map = NULL;
 +
 +    commit->object.util = util;
 +
 +    if(get_blob_sha1(commit->tree, path, util->sha1))
 +        return -1;
 +
 +    return 0;
 +}
 +
 +void alloc_line_map(struct commit* commit)
 +{
 +    struct util_info* util = commit->object.util;
 +
 +    if(util->line_map)
 +        return;
 +
 +    get_blob(commit);
 +
 +    int i;
 +    util->num_lines = 0;
 +    for(i = 0; i < util->size; i++) {
 +        if(util->buf[i] == '\n')
 +            util->num_lines++;
 +    }
 +    util->line_map = xmalloc(sizeof(int)*util->num_lines);
 +}
 +
 +void copy_line_map(struct commit* dst, struct commit* src)
 +{
 +    struct util_info* u_dst = dst->object.util;
 +    struct util_info* u_src = src->object.util;
 +
 +    u_dst->line_map = u_src->line_map;
 +    u_dst->num_lines = u_src->num_lines;
 +    u_dst->buf = u_src->buf;
 +    u_dst->size = u_src->size;
 +}
 +
 +void process_commits(struct commit_list* list, const char* path)
 +{
 +    int i;
 +
 +    while(list) {
 +        struct commit* commit = pop_commit(&list);
 +        struct commit_list* parents;
 +        struct util_info* info;
 +
 +        info = commit->object.util;
 +        num_commits++;
 +        if(DEBUG)
 +            printf("\nProcessing commit: %d %s\n", num_commits, sha1_to_hex(commit->object.sha1));
 +        for(parents = commit->parents;
 +            parents != NULL; parents = parents->next) {
 +            struct commit* parent = parents->item;
 +
 +            if(parse_commit(parent) < 0)
 +                die("parse_commit error");
 +
 +            if(DEBUG)
 +                printf("parent: %s\n", sha1_to_hex(parent->object.sha1));
 +
 +            if(fill_util_info(parent, path))
 +                continue;
 +
 +            // Temporarily assign everything to the parent.
 +            int num_blame = 0;
 +            for(i = 0; i < num_blame_lines; i++) {
 +                if(blame_lines[i] == commit) {
 +                    num_blame++;
 +                    blame_lines[i] = parent;
 +                }
 +            }
 +
 +            if(num_blame == 0)
 +                continue;
 +
 +            struct patch* patch = get_patch(parent, commit);
 +            if(patch->num == 0) {
 +                copy_line_map(parent, commit);
 +            } else {
 +                alloc_line_map(parent);
 +                fill_line_map(parent, commit, patch);
 +            }
 +
 +            for(i = 0; i < patch->num; i++) {
 +                int l;
 +                for(l = 0; l < patch->chunks[i].len2; l++) {
 +                    int mapped_line = map_line(commit, patch->chunks[i].off2 + l);
 +                    if(mapped_line != -1 && blame_lines[mapped_line] == parent)
 +                        blame_lines[mapped_line] = commit;
 +                }
 +            }
 +            free_patch(patch);
 +        }
 +    }
 +}
 +
 +#define SEEN 1
 +struct commit_list* get_commit_list(struct commit* commit, const char* pathname)
 +{
 +    struct commit_list* ret = NULL;
 +    struct commit_list* process = NULL;
 +    unsigned char sha1[20];
 +
 +    commit_list_insert(commit, &process);
 +
 +    while(process) {
 +        struct commit* com = pop_commit(&process);
 +        if(com->object.flags & SEEN)
 +            continue;
 +
 +        com->object.flags |= SEEN;
 +        commit_list_insert(com, &ret);
 +        struct commit_list* parents;
 +
 +        parse_commit(com);
 +
 +        for(parents = com->parents;
 +            parents != NULL; parents = parents->next) {
 +            struct commit* parent = parents->item;
 +
 +            parse_commit(parent);
 +
 +            if(!get_blob_sha1(parent->tree, pathname, sha1))
 +                commit_list_insert(parent, &process);
 +        }
 +    }
 +
 +    return ret;
 +}
 +
 +int main(int argc, const char **argv)
 +{
 +    unsigned char sha1[20];
 +    struct commit *commit;
 +    const char* filename;
 +    int i;
 +
 +    setup_git_directory();
 +
 +    if (argc != 3)
 +        die("Usage: blame commit-ish file");
 +
 +    if (get_sha1(argv[1], sha1))
 +        die("get_sha1 failed");
 +
 +    commit = lookup_commit_reference(sha1);
 +
 +    filename = argv[2];
 +
 +    struct commit_list* list = get_commit_list(commit, filename);
 +    sort_in_topological_order(&list, 1);
 +
 +    if(fill_util_info(commit, filename)) {
 +        printf("%s not found in %s\n", filename, argv[1]);
 +        return 0;
 +    }
 +    alloc_line_map(commit);
 +
 +    struct util_info* util = commit->object.util;
 +    num_blame_lines = util->num_lines;
 +    blame_lines = xmalloc(sizeof(struct commit*)*num_blame_lines);
 +
 +
 +    for(i = 0; i < num_blame_lines; i++) {
 +        blame_lines[i] = commit;
 +
 +        ((struct util_info*) commit->object.util)->line_map[i] = i;
 +    }
 +
 +    process_commits(list, filename);
 +
 +    for(i = 0; i < num_blame_lines; i++) {
 +        printf("%d %s\n", i+1-1, sha1_to_hex(blame_lines[i]->object.sha1));
 +//        printf("%d %s\n", i+1-1, find_unique_abbrev(blame_lines[i]->object.sha1, 6));
 +    }
 +
 +    if(DEBUG) {
 +        printf("num get patch: %d\n", num_get_patch);
 +        printf("num commits: %d\n", num_commits);
 +    }
 +
 +    return 0;
 +}