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#include <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
void check(int error, const char *message)
{
if (error) {
fprintf(stderr, "%s (%d)\n", message, error);
exit(1);
}
}
int resolve_to_tree(git_repository *repo, const char *identifier, git_tree **tree)
{
int err = 0;
size_t len = strlen(identifier);
git_oid oid;
git_object *obj = NULL;
/* try to resolve as OID */
if (git_oid_fromstrn(&oid, identifier, len) == 0)
git_object_lookup_prefix(&obj, repo, &oid, len, GIT_OBJ_ANY);
/* try to resolve as reference */
if (obj == NULL) {
git_reference *ref, *resolved;
if (git_reference_lookup(&ref, repo, identifier) == 0) {
git_reference_resolve(&resolved, ref);
git_reference_free(ref);
if (resolved) {
git_object_lookup(&obj, repo, git_reference_oid(resolved), GIT_OBJ_ANY);
git_reference_free(resolved);
}
}
}
if (obj == NULL)
return GIT_ENOTFOUND;
switch (git_object_type(obj)) {
case GIT_OBJ_TREE:
*tree = (git_tree *)obj;
break;
case GIT_OBJ_COMMIT:
err = git_commit_tree(tree, (git_commit *)obj);
git_object_free(obj);
break;
default:
err = GIT_ENOTFOUND;
}
return err;
}
char *colors[] = {
"\033[m", /* reset */
"\033[1m", /* bold */
"\033[31m", /* red */
"\033[32m", /* green */
"\033[36m" /* cyan */
};
int printer(void *data, char usage, const char *line)
{
int *last_color = data, color = 0;
if (*last_color >= 0) {
switch (usage) {
case GIT_DIFF_LINE_ADDITION: color = 3; break;
case GIT_DIFF_LINE_DELETION: color = 2; break;
case GIT_DIFF_LINE_ADD_EOFNL: color = 3; break;
case GIT_DIFF_LINE_DEL_EOFNL: color = 2; break;
case GIT_DIFF_LINE_FILE_HDR: color = 1; break;
case GIT_DIFF_LINE_HUNK_HDR: color = 4; break;
default: color = 0;
}
if (color != *last_color) {
if (*last_color == 1 || color == 1)
fputs(colors[0], stdout);
fputs(colors[color], stdout);
*last_color = color;
}
}
fputs(line, stdout);
return 0;
}
int main(int argc, char *argv[])
{
char path[GIT_PATH_MAX];
git_repository *repo = NULL;
git_tree *a, *b;
git_diff_options opts = {0};
git_diff_list *diff;
char *dir = ".";
int color = -1;
if (argc != 3) {
fprintf(stderr, "usage: diff <tree-oid> <tree-oid>\n");
exit(1);
}
check(git_repository_discover(path, sizeof(path), dir, 0, "/"),
"Could not discover repository");
check(git_repository_open(&repo, path),
"Could not open repository");
check(resolve_to_tree(repo, argv[1], &a), "Looking up first tree");
check(resolve_to_tree(repo, argv[2], &b), "Looking up second tree");
check(git_diff_tree_to_tree(repo, &opts, a, b, &diff), "Generating diff");
fputs(colors[0], stdout);
check(git_diff_print_compact(diff, &color, printer), "Displaying diff summary");
fprintf(stdout, "--\n");
color = 0;
check(git_diff_print_patch(diff, &color, printer), "Displaying diff");
fputs(colors[0], stdout);
git_diff_list_free(diff);
git_tree_free(a);
git_tree_free(b);
git_repository_free(repo);
return 0;
}
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