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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
/*
* This example demonstrates the use of the libgit2 diff APIs to
* create `git_diff` objects and display them, emulating a number of
* core Git `diff` command line options.
*
* This covers on a portion of the core Git diff options and doesn't
* have particularly good error handling, but it should show most of
* the core libgit2 diff APIs, including various types of diffs and
* how to do renaming detection and patch formatting.
*/
static const char *colors[] = {
"\033[m", /* reset */
"\033[1m", /* bold */
"\033[31m", /* red */
"\033[32m", /* green */
"\033[36m" /* cyan */
};
/* this implements very rudimentary colorized output */
static int color_printer(
const git_diff_delta*, const git_diff_hunk*, const git_diff_line*, void*);
/* the 'opts' struct captures all the various parsed command line options */
struct opts {
git_diff_options diffopts;
git_diff_find_options findopts;
int color;
int cached;
git_diff_format_t format;
const char *treeish1;
const char *treeish2;
const char *dir;
};
static void parse_opts(struct opts *o, int argc, char *argv[]);
int main(int argc, char *argv[])
{
git_repository *repo = NULL;
git_tree *t1 = NULL, *t2 = NULL;
git_diff *diff;
struct opts o = {
GIT_DIFF_OPTIONS_INIT, GIT_DIFF_FIND_OPTIONS_INIT,
-1, 0, GIT_DIFF_FORMAT_PATCH, NULL, NULL, "."
};
git_threads_init();
parse_opts(&o, argc, argv);
check_lg2(git_repository_open_ext(&repo, o.dir, 0, NULL),
"Could not open repository", o.dir);
/* Possible argument patterns:
* <sha1> <sha2>
* <sha1> --cached
* <sha1>
* --cached
* nothing
*
* Currently ranged arguments like <sha1>..<sha2> and <sha1>...<sha2>
* are not supported in this example
*/
if (o.treeish1)
treeish_to_tree(&t1, repo, o.treeish1);
if (o.treeish2)
treeish_to_tree(&t2, repo, o.treeish2);
if (t1 && t2)
check_lg2(
git_diff_tree_to_tree(&diff, repo, t1, t2, &o.diffopts),
"diff trees", NULL);
else if (t1 && o.cached)
check_lg2(
git_diff_tree_to_index(&diff, repo, t1, NULL, &o.diffopts),
"diff tree to index", NULL);
else if (t1)
check_lg2(
git_diff_tree_to_workdir_with_index(&diff, repo, t1, &o.diffopts),
"diff tree to working directory", NULL);
else if (o.cached) {
treeish_to_tree(&t1, repo, "HEAD");
check_lg2(
git_diff_tree_to_index(&diff, repo, t1, NULL, &o.diffopts),
"diff tree to index", NULL);
}
else
check_lg2(
git_diff_index_to_workdir(&diff, repo, NULL, &o.diffopts),
"diff index to working directory", NULL);
/* apply rename and copy detection if requested */
if ((o.findopts.flags & GIT_DIFF_FIND_ALL) != 0)
check_lg2(
git_diff_find_similar(diff, &o.findopts),
"finding renames and copies", NULL);
/* generate simple output using libgit2 display helper */
if (o.color >= 0)
fputs(colors[0], stdout);
check_lg2(
git_diff_print(diff, o.format, color_printer, &o.color),
"displaying diff", NULL);
if (o.color >= 0)
fputs(colors[0], stdout);
/* cleanup before exiting */
git_diff_free(diff);
git_tree_free(t1);
git_tree_free(t2);
git_repository_free(repo);
git_threads_shutdown();
return 0;
}
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);
}
static int color_printer(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
const git_diff_line *line,
void *data)
{
int *last_color = data, color = 0;
(void)delta; (void)hunk;
if (*last_color >= 0) {
switch (line->origin) {
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: break;
}
if (color != *last_color) {
if (*last_color == 1 || color == 1)
fputs(colors[0], stdout);
fputs(colors[color], stdout);
*last_color = color;
}
}
return diff_output(delta, hunk, line, stdout);
}
static void parse_opts(struct opts *o, int argc, char *argv[])
{
struct args_info args = ARGS_INFO_INIT;
/* parse arguments as copied from git-diff */
for (args.pos = 1; args.pos < argc; ++args.pos) {
const char *a = argv[args.pos];
if (a[0] != '-') {
if (o->treeish1 == NULL)
o->treeish1 = a;
else if (o->treeish2 == NULL)
o->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"))
o->format = GIT_DIFF_FORMAT_PATCH;
else if (!strcmp(a, "--cached"))
o->cached = 1;
else if (!strcmp(a, "--name-only"))
o->format = GIT_DIFF_FORMAT_NAME_ONLY;
else if (!strcmp(a, "--name-status"))
o->format = GIT_DIFF_FORMAT_NAME_STATUS;
else if (!strcmp(a, "--raw"))
o->format = GIT_DIFF_FORMAT_RAW;
else if (!strcmp(a, "--color"))
o->color = 0;
else if (!strcmp(a, "--no-color"))
o->color = -1;
else if (!strcmp(a, "-R"))
o->diffopts.flags |= GIT_DIFF_REVERSE;
else if (!strcmp(a, "-a") || !strcmp(a, "--text"))
o->diffopts.flags |= GIT_DIFF_FORCE_TEXT;
else if (!strcmp(a, "--ignore-space-at-eol"))
o->diffopts.flags |= GIT_DIFF_IGNORE_WHITESPACE_EOL;
else if (!strcmp(a, "-b") || !strcmp(a, "--ignore-space-change"))
o->diffopts.flags |= GIT_DIFF_IGNORE_WHITESPACE_CHANGE;
else if (!strcmp(a, "-w") || !strcmp(a, "--ignore-all-space"))
o->diffopts.flags |= GIT_DIFF_IGNORE_WHITESPACE;
else if (!strcmp(a, "--ignored"))
o->diffopts.flags |= GIT_DIFF_INCLUDE_IGNORED;
else if (!strcmp(a, "--untracked"))
o->diffopts.flags |= GIT_DIFF_INCLUDE_UNTRACKED;
else if (match_uint16_arg(
&o->findopts.rename_threshold, &args, "-M") ||
match_uint16_arg(
&o->findopts.rename_threshold, &args, "--find-renames"))
o->findopts.flags |= GIT_DIFF_FIND_RENAMES;
else if (match_uint16_arg(
&o->findopts.copy_threshold, &args, "-C") ||
match_uint16_arg(
&o->findopts.copy_threshold, &args, "--find-copies"))
o->findopts.flags |= GIT_DIFF_FIND_COPIES;
else if (!strcmp(a, "--find-copies-harder"))
o->findopts.flags |= GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED;
else if (is_prefixed(a, "-B") || is_prefixed(a, "--break-rewrites"))
/* TODO: parse thresholds */
o->findopts.flags |= GIT_DIFF_FIND_REWRITES;
else if (!match_uint16_arg(
&o->diffopts.context_lines, &args, "-U") &&
!match_uint16_arg(
&o->diffopts.context_lines, &args, "--unified") &&
!match_uint16_arg(
&o->diffopts.interhunk_lines, &args, "--inter-hunk-context") &&
!match_str_arg(&o->diffopts.old_prefix, &args, "--src-prefix") &&
!match_str_arg(&o->diffopts.new_prefix, &args, "--dst-prefix") &&
!match_str_arg(&o->dir, &args, "--git-dir"))
usage("Unknown command line argument", a);
}
}
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