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/*

* libgit2 "blame" example - shows how to use the blame API

*

* Written by the libgit2 contributors

*

* To the extent possible under law, the author(s) have dedicated all copyright

* and related and neighboring rights to this software to the public domain

* worldwide. This software is distributed without any warranty.

*

* You should have received a copy of the CC0 Public Domain Dedication along

* with this software. If not, see

* <http://creativecommons.org/publicdomain/zero/1.0/>.

*/

#include "common.h"

#ifdef _MSC_VER

#define snprintf sprintf_s

#define strcasecmp strcmpi

#endif

/**

* This example demonstrates how to invoke the libgit2 blame API to roughly

* simulate the output of `git blame` and a few of its command line arguments.

*/

struct opts {

char *path;

char *commitspec;

int C;

int M;

int start_line;

int end_line;

int F;

};

static void parse_opts(struct opts *o, int argc, char *argv[]);

int main(int argc, char *argv[])

{

int line, break_on_null_hunk;

size_t i, rawsize;

char spec[1024] = {0};

struct opts o = {0};

const char *rawdata;

git_repository *repo = NULL;

git_revspec revspec = {0};

git_blame_options blameopts = GIT_BLAME_OPTIONS_INIT;

git_blame *blame = NULL;

git_blob *blob;

git_object *obj;

git_libgit2_init();

parse_opts(&o, argc, argv);

if (o.M) blameopts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_MOVES;

if (o.C) blameopts.flags |= GIT_BLAME_TRACK_COPIES_SAME_COMMIT_COPIES;

if (o.F) blameopts.flags |= GIT_BLAME_FIRST_PARENT;

/** Open the repository. */

check_lg2(git_repository_open_ext(&repo, ".", 0, NULL), "Couldn't open repository", NULL);

/**

* The commit range comes in "commitish" form. Use the rev-parse API to

* nail down the end points.

*/

if (o.commitspec) {

check_lg2(git_revparse(&revspec, repo, o.commitspec), "Couldn't parse commit spec", NULL);

if (revspec.flags & GIT_REVPARSE_SINGLE) {

git_oid_cpy(&blameopts.newest_commit, git_object_id(revspec.from));

git_object_free(revspec.from);

} else {

git_oid_cpy(&blameopts.oldest_commit, git_object_id(revspec.from));

git_oid_cpy(&blameopts.newest_commit, git_object_id(revspec.to));

git_object_free(revspec.from);

git_object_free(revspec.to);

}

}

/** Run the blame. */

check_lg2(git_blame_file(&blame, repo, o.path, &blameopts), "Blame error", NULL);

/**

* Get the raw data inside the blob for output. We use the

* `commitish:path/to/file.txt` format to find it.

*/

if (git_oid_iszero(&blameopts.newest_commit))

strcpy(spec, "HEAD");

else

git_oid_tostr(spec, sizeof(spec), &blameopts.newest_commit);

strcat(spec, ":");

strcat(spec, o.path);

check_lg2(git_revparse_single(&obj, repo, spec), "Object lookup error", NULL);

check_lg2(git_blob_lookup(&blob, repo, git_object_id(obj)), "Blob lookup error", NULL);

git_object_free(obj);

rawdata = git_blob_rawcontent(blob);

rawsize = git_blob_rawsize(blob);

/** Produce the output. */

line = 1;

i = 0;

break_on_null_hunk = 0;

while (i < rawsize) {

const char *eol = memchr(rawdata + i, '\n', rawsize - i);

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) {

char sig[128] = {0};

break_on_null_hunk = 1;

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 = (int)(eol - rawdata + 1);

line++;

}

/** Cleanup. */

git_blob_free(blob);

git_blame_free(blame);

git_repository_free(repo);

git_libgit2_shutdown();

return 0;

}

/** Tell the user how to make this thing work. */

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, " -F follow only the first parent commits\n");

fprintf(stderr, "\n");

exit(1);

}

/** Parse the arguments. */

static void parse_opts(struct opts *o, int argc, char *argv[])

{

int i;

char *bare_args[3] = {0};

if (argc < 2) usage(NULL, NULL);

for (i=1; i<argc; i++) {

char *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"))

o->M = 1;

else if (!strcasecmp(a, "-C"))

o->C = 1;

else if (!strcasecmp(a, "-F"))

o->F = 1;

else if (!strcasecmp(a, "-L")) {

i++; a = argv[i];

if (i >= argc) fatal("Not enough arguments to -L", NULL);

check_lg2(sscanf(a, "%d,%d", &o->start_line, &o->end_line)-2, "-L format error", NULL);

}

else {

/* commit range */

if (o->commitspec) fatal("Only one commit spec allowed", NULL);

o->commitspec = a;

}

}

/* Handle the bare arguments */

if (!bare_args[0]) usage("Please specify a path", NULL);

o->path = bare_args[0];

if (bare_args[1]) {

/* <commitspec> <path> */

o->path = bare_args[1];

o->commitspec = bare_args[0];

}

if (bare_args[2]) {

/* <oldcommit> <newcommit> <path> */

char spec[128] = {0};

o->path = bare_args[2];

sprintf(spec, "%s..%s", bare_args[0], bare_args[1]);

o->commitspec = spec;

}

}