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632 lines (513 loc) · 15.8 KB
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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"
#include "diff.h"
#include "diff_patch.h"
#include "fileops.h"
#include "zstream.h"
#include "blob.h"
#include "delta.h"
#include "git2/sys/diff.h"
typedef struct {
git_diff *diff;
git_diff_format_t format;
git_diff_line_cb print_cb;
void *payload;
git_buf *buf;
uint32_t flags;
int oid_strlen;
git_diff_line line;
} diff_print_info;
static int diff_print_info_init(
diff_print_info *pi,
git_buf *out,
git_diff *diff,
git_diff_format_t format,
git_diff_line_cb cb,
void *payload)
{
pi->diff = diff;
pi->format = format;
pi->print_cb = cb;
pi->payload = payload;
pi->buf = out;
if (diff)
pi->flags = diff->opts.flags;
else
pi->flags = 0;
if (diff && diff->opts.id_abbrev != 0)
pi->oid_strlen = diff->opts.id_abbrev;
else if (!diff || !diff->repo)
pi->oid_strlen = GIT_ABBREV_DEFAULT;
else if (git_repository__cvar(
&pi->oid_strlen, diff->repo, GIT_CVAR_ABBREV) < 0)
return -1;
pi->oid_strlen += 1; /* for NUL byte */
if (pi->oid_strlen < 2)
pi->oid_strlen = 2;
else if (pi->oid_strlen > GIT_OID_HEXSZ + 1)
pi->oid_strlen = GIT_OID_HEXSZ + 1;
memset(&pi->line, 0, sizeof(pi->line));
pi->line.old_lineno = -1;
pi->line.new_lineno = -1;
pi->line.num_lines = 1;
return 0;
}
static char diff_pick_suffix(int mode)
{
if (S_ISDIR(mode))
return '/';
else if (GIT_PERMS_IS_EXEC(mode)) /* -V536 */
/* in git, modes are very regular, so we must have 0100755 mode */
return '*';
else
return ' ';
}
char git_diff_status_char(git_delta_t status)
{
char code;
switch (status) {
case GIT_DELTA_ADDED: code = 'A'; break;
case GIT_DELTA_DELETED: code = 'D'; break;
case GIT_DELTA_MODIFIED: code = 'M'; break;
case GIT_DELTA_RENAMED: code = 'R'; break;
case GIT_DELTA_COPIED: code = 'C'; break;
case GIT_DELTA_IGNORED: code = 'I'; break;
case GIT_DELTA_UNTRACKED: code = '?'; break;
default: code = ' '; break;
}
return code;
}
static int diff_print_one_name_only(
const git_diff_delta *delta, float progress, void *data)
{
diff_print_info *pi = data;
git_buf *out = pi->buf;
GIT_UNUSED(progress);
if ((pi->flags & GIT_DIFF_SHOW_UNMODIFIED) == 0 &&
delta->status == GIT_DELTA_UNMODIFIED)
return 0;
git_buf_clear(out);
git_buf_puts(out, delta->new_file.path);
git_buf_putc(out, '\n');
if (git_buf_oom(out))
return -1;
pi->line.origin = GIT_DIFF_LINE_FILE_HDR;
pi->line.content = git_buf_cstr(out);
pi->line.content_len = git_buf_len(out);
return pi->print_cb(delta, NULL, &pi->line, pi->payload);
}
static int diff_print_one_name_status(
const git_diff_delta *delta, float progress, void *data)
{
diff_print_info *pi = data;
git_buf *out = pi->buf;
char old_suffix, new_suffix, code = git_diff_status_char(delta->status);
int (*strcomp)(const char *, const char *) =
pi->diff ? pi->diff->strcomp : git__strcmp;
GIT_UNUSED(progress);
if ((pi->flags & GIT_DIFF_SHOW_UNMODIFIED) == 0 && code == ' ')
return 0;
old_suffix = diff_pick_suffix(delta->old_file.mode);
new_suffix = diff_pick_suffix(delta->new_file.mode);
git_buf_clear(out);
if (delta->old_file.path != delta->new_file.path &&
strcomp(delta->old_file.path,delta->new_file.path) != 0)
git_buf_printf(out, "%c\t%s%c %s%c\n", code,
delta->old_file.path, old_suffix, delta->new_file.path, new_suffix);
else if (delta->old_file.mode != delta->new_file.mode &&
delta->old_file.mode != 0 && delta->new_file.mode != 0)
git_buf_printf(out, "%c\t%s%c %s%c\n", code,
delta->old_file.path, old_suffix, delta->new_file.path, new_suffix);
else if (old_suffix != ' ')
git_buf_printf(out, "%c\t%s%c\n", code, delta->old_file.path, old_suffix);
else
git_buf_printf(out, "%c\t%s\n", code, delta->old_file.path);
if (git_buf_oom(out))
return -1;
pi->line.origin = GIT_DIFF_LINE_FILE_HDR;
pi->line.content = git_buf_cstr(out);
pi->line.content_len = git_buf_len(out);
return pi->print_cb(delta, NULL, &pi->line, pi->payload);
}
static int diff_print_one_raw(
const git_diff_delta *delta, float progress, void *data)
{
diff_print_info *pi = data;
git_buf *out = pi->buf;
char code = git_diff_status_char(delta->status);
char start_oid[GIT_OID_HEXSZ+1], end_oid[GIT_OID_HEXSZ+1];
GIT_UNUSED(progress);
if ((pi->flags & GIT_DIFF_SHOW_UNMODIFIED) == 0 && code == ' ')
return 0;
git_buf_clear(out);
git_oid_tostr(start_oid, pi->oid_strlen, &delta->old_file.id);
git_oid_tostr(end_oid, pi->oid_strlen, &delta->new_file.id);
git_buf_printf(
out, (pi->oid_strlen <= GIT_OID_HEXSZ) ?
":%06o %06o %s... %s... %c" : ":%06o %06o %s %s %c",
delta->old_file.mode, delta->new_file.mode, start_oid, end_oid, code);
if (delta->similarity > 0)
git_buf_printf(out, "%03u", delta->similarity);
if (delta->old_file.path != delta->new_file.path)
git_buf_printf(
out, "\t%s %s\n", delta->old_file.path, delta->new_file.path);
else
git_buf_printf(
out, "\t%s\n", delta->old_file.path ?
delta->old_file.path : delta->new_file.path);
if (git_buf_oom(out))
return -1;
pi->line.origin = GIT_DIFF_LINE_FILE_HDR;
pi->line.content = git_buf_cstr(out);
pi->line.content_len = git_buf_len(out);
return pi->print_cb(delta, NULL, &pi->line, pi->payload);
}
static int diff_print_oid_range(
git_buf *out, const git_diff_delta *delta, int oid_strlen)
{
char start_oid[GIT_OID_HEXSZ+1], end_oid[GIT_OID_HEXSZ+1];
git_oid_tostr(start_oid, oid_strlen, &delta->old_file.id);
git_oid_tostr(end_oid, oid_strlen, &delta->new_file.id);
/* TODO: Match git diff more closely */
if (delta->old_file.mode == delta->new_file.mode) {
git_buf_printf(out, "index %s..%s %o\n",
start_oid, end_oid, delta->old_file.mode);
} else {
if (delta->old_file.mode == 0) {
git_buf_printf(out, "new file mode %o\n", delta->new_file.mode);
} else if (delta->new_file.mode == 0) {
git_buf_printf(out, "deleted file mode %o\n", delta->old_file.mode);
} else {
git_buf_printf(out, "old mode %o\n", delta->old_file.mode);
git_buf_printf(out, "new mode %o\n", delta->new_file.mode);
}
git_buf_printf(out, "index %s..%s\n", start_oid, end_oid);
}
return git_buf_oom(out) ? -1 : 0;
}
static int diff_delta_format_with_paths(
git_buf *out,
const git_diff_delta *delta,
const char *oldpfx,
const char *newpfx,
const char *template)
{
const char *oldpath = delta->old_file.path;
const char *newpath = delta->new_file.path;
if (git_oid_iszero(&delta->old_file.id)) {
oldpfx = "";
oldpath = "/dev/null";
}
if (git_oid_iszero(&delta->new_file.id)) {
newpfx = "";
newpath = "/dev/null";
}
return git_buf_printf(out, template, oldpfx, oldpath, newpfx, newpath);
}
int git_diff_delta__format_file_header(
git_buf *out,
const git_diff_delta *delta,
const char *oldpfx,
const char *newpfx,
int oid_strlen)
{
if (!oldpfx)
oldpfx = DIFF_OLD_PREFIX_DEFAULT;
if (!newpfx)
newpfx = DIFF_NEW_PREFIX_DEFAULT;
if (!oid_strlen)
oid_strlen = GIT_ABBREV_DEFAULT + 1;
git_buf_clear(out);
git_buf_printf(out, "diff --git %s%s %s%s\n",
oldpfx, delta->old_file.path, newpfx, delta->new_file.path);
GITERR_CHECK_ERROR(diff_print_oid_range(out, delta, oid_strlen));
if ((delta->flags & GIT_DIFF_FLAG_BINARY) == 0)
diff_delta_format_with_paths(
out, delta, oldpfx, newpfx, "--- %s%s\n+++ %s%s\n");
return git_buf_oom(out) ? -1 : 0;
}
static int print_binary_hunk(diff_print_info *pi, git_blob *old, git_blob *new)
{
git_buf deflate = GIT_BUF_INIT, delta = GIT_BUF_INIT, *out = NULL;
const void *old_data, *new_data;
git_off_t old_data_len, new_data_len;
unsigned long delta_data_len, inflated_len;
const char *out_type = "literal";
char *scan, *end;
int error;
old_data = old ? git_blob_rawcontent(old) : NULL;
new_data = new ? git_blob_rawcontent(new) : NULL;
old_data_len = old ? git_blob_rawsize(old) : 0;
new_data_len = new ? git_blob_rawsize(new) : 0;
/* The git_delta function accepts unsigned long only */
if (!git__is_ulong(old_data_len) || !git__is_ulong(new_data_len))
return GIT_EBUFS;
out = &deflate;
inflated_len = (unsigned long)new_data_len;
if ((error = git_zstream_deflatebuf(
out, new_data, (size_t)new_data_len)) < 0)
goto done;
/* The git_delta function accepts unsigned long only */
if (!git__is_ulong((git_off_t)deflate.size)) {
error = GIT_EBUFS;
goto done;
}
if (old && new) {
void *delta_data = git_delta(
old_data, (unsigned long)old_data_len,
new_data, (unsigned long)new_data_len,
&delta_data_len, (unsigned long)deflate.size);
if (delta_data) {
error = git_zstream_deflatebuf(
&delta, delta_data, (size_t)delta_data_len);
git__free(delta_data);
if (error < 0)
goto done;
if (delta.size < deflate.size) {
out = δ
out_type = "delta";
inflated_len = delta_data_len;
}
}
}
git_buf_printf(pi->buf, "%s %lu\n", out_type, inflated_len);
pi->line.num_lines++;
for (scan = out->ptr, end = out->ptr + out->size; scan < end; ) {
size_t chunk_len = end - scan;
if (chunk_len > 52)
chunk_len = 52;
if (chunk_len <= 26)
git_buf_putc(pi->buf, (char)chunk_len + 'A' - 1);
else
git_buf_putc(pi->buf, (char)chunk_len - 26 + 'a' - 1);
git_buf_put_base85(pi->buf, scan, chunk_len);
git_buf_putc(pi->buf, '\n');
if (git_buf_oom(pi->buf)) {
error = -1;
goto done;
}
scan += chunk_len;
pi->line.num_lines++;
}
done:
git_buf_free(&deflate);
git_buf_free(&delta);
return error;
}
/* git diff --binary 8d7523f~2 8d7523f~1 */
static int diff_print_patch_file_binary(
diff_print_info *pi, const git_diff_delta *delta,
const char *oldpfx, const char *newpfx)
{
git_blob *old = NULL, *new = NULL;
const git_oid *old_id, *new_id;
int error;
size_t pre_binary_size;
if ((pi->flags & GIT_DIFF_SHOW_BINARY) == 0)
goto noshow;
pre_binary_size = pi->buf->size;
git_buf_printf(pi->buf, "GIT binary patch\n");
pi->line.num_lines++;
old_id = (delta->status != GIT_DELTA_ADDED) ? &delta->old_file.id : NULL;
new_id = (delta->status != GIT_DELTA_DELETED) ? &delta->new_file.id : NULL;
if (old_id && (error = git_blob_lookup(&old, pi->diff->repo, old_id)) < 0)
goto done;
if (new_id && (error = git_blob_lookup(&new, pi->diff->repo,new_id)) < 0)
goto done;
if ((error = print_binary_hunk(pi, old, new)) < 0 ||
(error = git_buf_putc(pi->buf, '\n')) < 0 ||
(error = print_binary_hunk(pi, new, old)) < 0)
{
if (error == GIT_EBUFS) {
giterr_clear();
git_buf_truncate(pi->buf, pre_binary_size);
goto noshow;
}
}
pi->line.num_lines++;
done:
git_blob_free(old);
git_blob_free(new);
return error;
noshow:
pi->line.num_lines = 1;
return diff_delta_format_with_paths(
pi->buf, delta, oldpfx, newpfx,
"Binary files %s%s and %s%s differ\n");
}
static int diff_print_patch_file(
const git_diff_delta *delta, float progress, void *data)
{
int error;
diff_print_info *pi = data;
const char *oldpfx =
pi->diff ? pi->diff->opts.old_prefix : DIFF_OLD_PREFIX_DEFAULT;
const char *newpfx =
pi->diff ? pi->diff->opts.new_prefix : DIFF_NEW_PREFIX_DEFAULT;
bool binary = !!(delta->flags & GIT_DIFF_FLAG_BINARY);
bool show_binary = !!(pi->flags & GIT_DIFF_SHOW_BINARY);
int oid_strlen = binary && show_binary ?
GIT_OID_HEXSZ + 1 : pi->oid_strlen;
GIT_UNUSED(progress);
if (S_ISDIR(delta->new_file.mode) ||
delta->status == GIT_DELTA_UNMODIFIED ||
delta->status == GIT_DELTA_IGNORED ||
(delta->status == GIT_DELTA_UNTRACKED &&
(pi->flags & GIT_DIFF_SHOW_UNTRACKED_CONTENT) == 0))
return 0;
if ((error = git_diff_delta__format_file_header(
pi->buf, delta, oldpfx, newpfx, oid_strlen)) < 0)
return error;
pi->line.origin = GIT_DIFF_LINE_FILE_HDR;
pi->line.content = git_buf_cstr(pi->buf);
pi->line.content_len = git_buf_len(pi->buf);
if ((error = pi->print_cb(delta, NULL, &pi->line, pi->payload)) != 0)
return error;
if (!binary)
return 0;
git_buf_clear(pi->buf);
if ((error = diff_print_patch_file_binary(pi, delta, oldpfx, newpfx)) < 0)
return error;
pi->line.origin = GIT_DIFF_LINE_BINARY;
pi->line.content = git_buf_cstr(pi->buf);
pi->line.content_len = git_buf_len(pi->buf);
return pi->print_cb(delta, NULL, &pi->line, pi->payload);
}
static int diff_print_patch_hunk(
const git_diff_delta *d,
const git_diff_hunk *h,
void *data)
{
diff_print_info *pi = data;
if (S_ISDIR(d->new_file.mode))
return 0;
pi->line.origin = GIT_DIFF_LINE_HUNK_HDR;
pi->line.content = h->header;
pi->line.content_len = h->header_len;
return pi->print_cb(d, h, &pi->line, pi->payload);
}
static int diff_print_patch_line(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
const git_diff_line *line,
void *data)
{
diff_print_info *pi = data;
if (S_ISDIR(delta->new_file.mode))
return 0;
return pi->print_cb(delta, hunk, line, pi->payload);
}
/* print a git_diff to an output callback */
int git_diff_print(
git_diff *diff,
git_diff_format_t format,
git_diff_line_cb print_cb,
void *payload)
{
int error;
git_buf buf = GIT_BUF_INIT;
diff_print_info pi;
git_diff_file_cb print_file = NULL;
git_diff_hunk_cb print_hunk = NULL;
git_diff_line_cb print_line = NULL;
switch (format) {
case GIT_DIFF_FORMAT_PATCH:
print_file = diff_print_patch_file;
print_hunk = diff_print_patch_hunk;
print_line = diff_print_patch_line;
break;
case GIT_DIFF_FORMAT_PATCH_HEADER:
print_file = diff_print_patch_file;
break;
case GIT_DIFF_FORMAT_RAW:
print_file = diff_print_one_raw;
break;
case GIT_DIFF_FORMAT_NAME_ONLY:
print_file = diff_print_one_name_only;
break;
case GIT_DIFF_FORMAT_NAME_STATUS:
print_file = diff_print_one_name_status;
break;
default:
giterr_set(GITERR_INVALID, "Unknown diff output format (%d)", format);
return -1;
}
if (!(error = diff_print_info_init(
&pi, &buf, diff, format, print_cb, payload)))
{
error = git_diff_foreach(
diff, print_file, print_hunk, print_line, &pi);
if (error) /* make sure error message is set */
giterr_set_after_callback_function(error, "git_diff_print");
}
git_buf_free(&buf);
return error;
}
/* print a git_patch to an output callback */
int git_patch_print(
git_patch *patch,
git_diff_line_cb print_cb,
void *payload)
{
int error;
git_buf temp = GIT_BUF_INIT;
diff_print_info pi;
assert(patch && print_cb);
if (!(error = diff_print_info_init(
&pi, &temp, git_patch__diff(patch),
GIT_DIFF_FORMAT_PATCH, print_cb, payload)))
{
error = git_patch__invoke_callbacks(
patch, diff_print_patch_file, diff_print_patch_hunk,
diff_print_patch_line, &pi);
if (error) /* make sure error message is set */
giterr_set_after_callback_function(error, "git_patch_print");
}
git_buf_free(&temp);
return error;
}
int git_diff_print_callback__to_buf(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
const git_diff_line *line,
void *payload)
{
git_buf *output = payload;
GIT_UNUSED(delta); GIT_UNUSED(hunk);
if (!output) {
giterr_set(GITERR_INVALID, "Buffer pointer must be provided");
return -1;
}
if (line->origin == GIT_DIFF_LINE_ADDITION ||
line->origin == GIT_DIFF_LINE_DELETION ||
line->origin == GIT_DIFF_LINE_CONTEXT)
git_buf_putc(output, line->origin);
return git_buf_put(output, line->content, line->content_len);
}
int git_diff_print_callback__to_file_handle(
const git_diff_delta *delta,
const git_diff_hunk *hunk,
const git_diff_line *line,
void *payload)
{
FILE *fp = payload ? payload : stdout;
GIT_UNUSED(delta); GIT_UNUSED(hunk);
if (line->origin == GIT_DIFF_LINE_CONTEXT ||
line->origin == GIT_DIFF_LINE_ADDITION ||
line->origin == GIT_DIFF_LINE_DELETION)
fputc(line->origin, fp);
fwrite(line->content, 1, line->content_len, fp);
return 0;
}
/* print a git_patch to a git_buf */
int git_patch_to_buf(git_buf *out, git_patch *patch)
{
assert(out && patch);
git_buf_sanitize(out);
return git_patch_print(patch, git_diff_print_callback__to_buf, out);
}
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