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#include <stdio.h>
#include <git2.h>
#include <stdlib.h>
#include <string.h>
static void check(int error, const char *message)
{
if (error) {
fprintf(stderr, "%s (%d)\n", message, error);
exit(1);
}
}
static int resolve_to_tree(
git_repository *repo, const char *identifier, git_tree **tree)
{
int err = 0;
git_object *obj = NULL;
if ((err = git_revparse_single(&obj, repo, identifier)) < 0)
return err;
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 */
};
static int printer(
const git_diff_delta *delta,
const git_diff_range *range,
char usage,
const char *line,
size_t line_len,
void *data)
{
int *last_color = data, color = 0;
(void)delta; (void)range; (void)line_len;
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;
}
static int check_uint16_param(const char *arg, const char *pattern, uint16_t *val)
{
size_t len = strlen(pattern);
uint16_t strval;
char *endptr = NULL;
if (strncmp(arg, pattern, len))
return 0;
strval = strtoul(arg + len, &endptr, 0);
if (endptr == arg)
return 0;
*val = strval;
return 1;
}
static int check_str_param(const char *arg, const char *pattern, const char **val)
{
size_t len = strlen(pattern);
if (strncmp(arg, pattern, len))
return 0;
*val = (const char *)(arg + len);
return 1;
}
static void usage(const char *message, const char *arg)
{
if (message && arg)
fprintf(stderr, "%s: %s\n", message, arg);
else if (message)
fprintf(stderr, "%s\n", message);
fprintf(stderr, "usage: diff [<tree-oid> [<tree-oid>]]\n");
exit(1);
}
int main(int argc, char *argv[])
{
git_repository *repo = NULL;
git_tree *t1 = NULL, *t2 = NULL;
git_diff_options opts = GIT_DIFF_OPTIONS_INIT;
git_diff_list *diff;
int i, color = -1, compact = 0, cached = 0;
char *a, *dir = ".", *treeish1 = NULL, *treeish2 = NULL;
/* parse arguments as copied from git-diff */
for (i = 1; i < argc; ++i) {
a = argv[i];
if (a[0] != '-') {
if (treeish1 == NULL)
treeish1 = a;
else if (treeish2 == NULL)
treeish2 = a;
else
usage("Only one or two tree identifiers can be provided", NULL);
}
else if (!strcmp(a, "-p") || !strcmp(a, "-u") ||
!strcmp(a, "--patch"))
compact = 0;
else if (!strcmp(a, "--cached"))
cached = 1;
else if (!strcmp(a, "--name-status"))
compact = 1;
else if (!strcmp(a, "--color"))
color = 0;
else if (!strcmp(a, "--no-color"))
color = -1;
else if (!strcmp(a, "-R"))
opts.flags |= GIT_DIFF_REVERSE;
else if (!strcmp(a, "-a") || !strcmp(a, "--text"))
opts.flags |= GIT_DIFF_FORCE_TEXT;
else if (!strcmp(a, "--ignore-space-at-eol"))
opts.flags |= GIT_DIFF_IGNORE_WHITESPACE_EOL;
else if (!strcmp(a, "-b") || !strcmp(a, "--ignore-space-change"))
opts.flags |= GIT_DIFF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(a, "-w") || !strcmp(a, "--ignore-all-space"))
opts.flags |= GIT_DIFF_IGNORE_WHITESPACE;
else if (!strcmp(a, "--ignored"))
opts.flags |= GIT_DIFF_INCLUDE_IGNORED;
else if (!strcmp(a, "--untracked"))
opts.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
else if (!check_uint16_param(a, "-U", &opts.context_lines) &&
!check_uint16_param(a, "--unified=", &opts.context_lines) &&
!check_uint16_param(a, "--inter-hunk-context=",
&opts.interhunk_lines) &&
!check_str_param(a, "--src-prefix=", &opts.old_prefix) &&
!check_str_param(a, "--dst-prefix=", &opts.new_prefix))
usage("Unknown arg", a);
}
/* open repo */
check(git_repository_open_ext(&repo, dir, 0, NULL),
"Could not open repository");
if (treeish1)
check(resolve_to_tree(repo, treeish1, &t1), "Looking up first tree");
if (treeish2)
check(resolve_to_tree(repo, treeish2, &t2), "Looking up second tree");
/* <sha1> <sha2> */
/* <sha1> --cached */
/* <sha1> */
/* --cached */
/* nothing */
if (t1 && t2)
check(git_diff_tree_to_tree(&diff, repo, t1, t2, &opts), "Diff");
else if (t1 && cached)
check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");
else if (t1) {
git_diff_list *diff2;
check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");
check(git_diff_index_to_workdir(&diff2, repo, NULL, &opts), "Diff");
check(git_diff_merge(diff, diff2), "Merge diffs");
git_diff_list_free(diff2);
}
else if (cached) {
check(resolve_to_tree(repo, "HEAD", &t1), "looking up HEAD");
check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");
}
else
check(git_diff_index_to_workdir(&diff, repo, NULL, &opts), "Diff");
if (color >= 0)
fputs(colors[0], stdout);
if (compact)
check(git_diff_print_compact(diff, printer, &color), "Displaying diff");
else
check(git_diff_print_patch(diff, printer, &color), "Displaying diff");
if (color >= 0)
fputs(colors[0], stdout);
git_diff_list_free(diff);
git_tree_free(t1);
git_tree_free(t2);
git_repository_free(repo);
return 0;
}
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