#include <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
static void check(int error, const char *msg)
{
if (error) {
fprintf(stderr, "%s (%d)\n", msg, error);
exit(error);
}
}
static void usage(const char *msg, const char *arg)
{
if (msg && arg)
fprintf(stderr, "%s: %s\n", msg, arg);
else if (msg)
fprintf(stderr, "%s\n", msg);
fprintf(stderr, "usage: blame [options] [<commit range>] <path>\n");
fprintf(stderr, "\n");
fprintf(stderr, " <commit range> example: `HEAD~10..HEAD`, or `1234abcd`\n");
fprintf(stderr, " -L <n,m> process only line range n-m, counting from 1\n");
fprintf(stderr, " -M find line moves within and across files\n");
fprintf(stderr, " -C find line copies within and across files\n");
fprintf(stderr, "\n");
exit(1);
}
int main(int argc, char *argv[])
{
int i, line, break_on_null_hunk;
const char *path = NULL, *a;
const char *rawdata, *commitspec=NULL, *bare_args[3] = {0};
char spec[1024] = {0};
git_repository *repo = NULL;
git_revspec revspec = {0};
git_blame_options opts = GIT_BLAME_OPTIONS_INIT;
git_blame *blame = NULL;
git_blob *blob;
git_threads_init();
if (argc < 2) usage(NULL, NULL);
for (i=1; i<argc; i++) {
a = argv[i];
if (a[0] != '-') {
int i=0;
while (bare_args[i] && i < 3) ++i;
if (i >= 3)
usage("Invalid argument set", NULL);
bare_args[i] = a;
}
else if (!strcmp(a, "--"))
continue;
else if (!strcasecmp(a, "-M"))
opts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES;
else if (!strcasecmp(a, "-C"))
opts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES;
else if (!strcasecmp(a, "-L")) {
i++; a = argv[i];
if (i >= argc) check(-1, "Not enough arguments to -L");
check(sscanf(a, "%d,%d", &opts.min_line, &opts.max_line)-2, "-L format error");
}
else {
/* commit range */
if (commitspec) check(-1, "Only one commit spec allowed");
commitspec = a;
}
}
/* Handle the bare arguments */
if (!bare_args[0]) usage("Please specify a path", NULL);
path = bare_args[0];
if (bare_args[1]) {
/* <commitspec> <path> */
path = bare_args[1];
commitspec = bare_args[0];
}
if (bare_args[2]) {
/* <oldcommit> <newcommit> <path> */
path = bare_args[2];
sprintf(spec, "%s..%s", bare_args[0], bare_args[1]);
commitspec = spec;
}
/* Open the repo */
check(git_repository_open_ext(&repo, ".", 0, NULL), "Couldn't open repository");
/* Parse the end points */
if (commitspec) {
check(git_revparse(&revspec, repo, commitspec), "Couldn't parse commit spec");
if (revspec.flags & GIT_REVPARSE_SINGLE) {
git_oid_cpy(&opts.newest_commit, git_object_id(revspec.from));
git_object_free(revspec.from);
} else {
git_oid_cpy(&opts.oldest_commit, git_object_id(revspec.from));
git_oid_cpy(&opts.newest_commit, git_object_id(revspec.to));
git_object_free(revspec.from);
git_object_free(revspec.to);
}
}
/* Run the blame */
check(git_blame_file(&blame, repo, path, &opts), "Blame error");
/* Get the raw data for output */
if (git_oid_iszero(&opts.newest_commit))
strcpy(spec, "HEAD");
else
git_oid_tostr(spec, sizeof(spec), &opts.newest_commit);
strcat(spec, ":");
strcat(spec, path);
{
git_object *obj;
check(git_revparse_single(&obj, repo, spec), "Object lookup error");
check(git_blob_lookup(&blob, repo, git_object_id(obj)), "Blob lookup error");
git_object_free(obj);
}
rawdata = git_blob_rawcontent(blob);
/* Produce the output */
line = 1;
i = 0;
break_on_null_hunk = 0;
while (i < git_blob_rawsize(blob)) {
const char *eol = strchr(rawdata+i, '\n');
char oid[10] = {0};
const git_blame_hunk *hunk = git_blame_get_hunk_byline(blame, line);
if (break_on_null_hunk && !hunk) break;
if (hunk) {
break_on_null_hunk = 1;
char sig[128] = {0};
git_oid_tostr(oid, 10, &hunk->final_commit_id);
snprintf(sig, 30, "%s <%s>", hunk->final_signature->name, hunk->final_signature->email);
printf("%s ( %-30s %3d) %.*s\n",
oid,
sig,
line,
(int)(eol-rawdata-i),
rawdata+i);
}
i = eol - rawdata + 1;
line++;
}
/* Cleanup */
git_blob_free(blob);
git_blame_free(blame);
git_repository_free(repo);
git_threads_shutdown();
}
