#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 <path> [options] [<commit range>]\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 fine 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;
char *path = NULL, *a;
const char *rawdata, *commitspec=NULL;
git_repository *repo = NULL;
git_revspec revspec = {0};
git_blame_options opts = GIT_BLAME_OPTIONS_INIT;
git_blame *blame = NULL;
git_commit *commit;
git_tree *tree;
git_tree_entry *entry;
git_blob *blob;
if (argc < 2) usage(NULL, NULL);
path = argv[1];
for (i=2; i<argc; i++) {
a = argv[i];
if (!strcmp(a, "-M"))
opts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES;
else if (!strcmp(a, "-C"))
opts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES;
else if (!strncmp(a, "-L", 3)) {
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;
}
}
/* 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)) {
git_object *obj;
check(git_revparse_single(&obj, repo, "HEAD"), "Can't find HEAD");
git_oid_cpy(&opts.newest_commit, git_object_id(obj));
git_object_free(obj);
}
check(git_commit_lookup(&commit, repo, &opts.newest_commit), "Commit lookup error");
check(git_commit_tree(&tree, commit), "Commit tree lookup error");
check(git_tree_entry_bypath(&entry, tree, path), "Tree entry lookup error");
check(git_blob_lookup(&blob, repo, git_tree_entry_id(entry)), "Blob lookup error");
rawdata = git_blob_rawcontent(blob);
/* Produce the output */
i = 1;
while (rawdata[0]) {
const char *eol = strchr(rawdata, '\n');
char oid[10] = {0};
const git_blame_hunk *hunk = git_blame_get_hunk_byline(blame, i);
git_commit *hunkcommit;
const git_signature *sig;
git_oid_tostr(oid, 10, &hunk->final_commit_id);
check(git_commit_lookup(&hunkcommit, repo, &hunk->final_commit_id), "Commit lookup error");
sig = git_commit_author(hunkcommit);
printf("%s ( %-30s %3d) %.*s\n",
oid,
sig->name,
i,
(int)(eol-rawdata),
rawdata);
git_commit_free(hunkcommit);
rawdata = eol+1;
i++;
}
/* Cleanup */
git_blob_free(blob);
git_tree_entry_free(entry);
git_tree_free(tree);
git_commit_free(commit);
git_blame_free(blame);
git_repository_free(repo);
}
