git-commit-vandalism/diff-no-index.c
Jeff King 287ab28bfa diff: reuse diff setup for --no-index case
When "--no-index" is in effect (or implied by the arguments), git-diff
jumps early to a special code path to perform that diff. This means we
miss out on some settings like enabling --ext-diff and --textconv by
default.

Let's jump to the no-index path _after_ we've done more setup on
rev.diffopt. Since some of the options don't affect us (e.g., items
related to the index), let's re-order the setup into two blocks (see the
in-code comments).

Note that we also need to stop re-initializing the diffopt struct in
diff_no_index(). This should not be necessary, as it will already have
been initialized by cmd_diff() (and there are no other callers). That in
turn lets us drop the "repository" argument from diff_no_index (which
never made much sense, since the whole point is that you don't need a
repository).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-24 07:08:34 -08:00

303 lines
6.8 KiB
C

/*
* "diff --no-index" support
* Copyright (c) 2007 by Johannes Schindelin
* Copyright (c) 2008 by Junio C Hamano
*/
#include "cache.h"
#include "color.h"
#include "commit.h"
#include "blob.h"
#include "tag.h"
#include "diff.h"
#include "diffcore.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"
#include "string-list.h"
#include "dir.h"
static int read_directory_contents(const char *path, struct string_list *list)
{
DIR *dir;
struct dirent *e;
if (!(dir = opendir(path)))
return error("Could not open directory %s", path);
while ((e = readdir(dir)))
if (!is_dot_or_dotdot(e->d_name))
string_list_insert(list, e->d_name);
closedir(dir);
return 0;
}
/*
* This should be "(standard input)" or something, but it will
* probably expose many more breakages in the way no-index code
* is bolted onto the diff callchain.
*/
static const char file_from_standard_input[] = "-";
static int get_mode(const char *path, int *mode)
{
struct stat st;
if (!path || !strcmp(path, "/dev/null"))
*mode = 0;
#ifdef GIT_WINDOWS_NATIVE
else if (!strcasecmp(path, "nul"))
*mode = 0;
#endif
else if (path == file_from_standard_input)
*mode = create_ce_mode(0666);
else if (lstat(path, &st))
return error("Could not access '%s'", path);
else
*mode = st.st_mode;
return 0;
}
static int populate_from_stdin(struct diff_filespec *s)
{
struct strbuf buf = STRBUF_INIT;
size_t size = 0;
if (strbuf_read(&buf, 0, 0) < 0)
return error_errno("error while reading from stdin");
s->should_munmap = 0;
s->data = strbuf_detach(&buf, &size);
s->size = size;
s->should_free = 1;
s->is_stdin = 1;
return 0;
}
static struct diff_filespec *noindex_filespec(const char *name, int mode)
{
struct diff_filespec *s;
if (!name)
name = "/dev/null";
s = alloc_filespec(name);
fill_filespec(s, &null_oid, 0, mode);
if (name == file_from_standard_input)
populate_from_stdin(s);
return s;
}
static int queue_diff(struct diff_options *o,
const char *name1, const char *name2)
{
int mode1 = 0, mode2 = 0;
if (get_mode(name1, &mode1) || get_mode(name2, &mode2))
return -1;
if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) {
struct diff_filespec *d1, *d2;
if (S_ISDIR(mode1)) {
/* 2 is file that is created */
d1 = noindex_filespec(NULL, 0);
d2 = noindex_filespec(name2, mode2);
name2 = NULL;
mode2 = 0;
} else {
/* 1 is file that is deleted */
d1 = noindex_filespec(name1, mode1);
d2 = noindex_filespec(NULL, 0);
name1 = NULL;
mode1 = 0;
}
/* emit that file */
diff_queue(&diff_queued_diff, d1, d2);
/* and then let the entire directory be created or deleted */
}
if (S_ISDIR(mode1) || S_ISDIR(mode2)) {
struct strbuf buffer1 = STRBUF_INIT;
struct strbuf buffer2 = STRBUF_INIT;
struct string_list p1 = STRING_LIST_INIT_DUP;
struct string_list p2 = STRING_LIST_INIT_DUP;
int i1, i2, ret = 0;
size_t len1 = 0, len2 = 0;
if (name1 && read_directory_contents(name1, &p1))
return -1;
if (name2 && read_directory_contents(name2, &p2)) {
string_list_clear(&p1, 0);
return -1;
}
if (name1) {
strbuf_addstr(&buffer1, name1);
strbuf_complete(&buffer1, '/');
len1 = buffer1.len;
}
if (name2) {
strbuf_addstr(&buffer2, name2);
strbuf_complete(&buffer2, '/');
len2 = buffer2.len;
}
for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) {
const char *n1, *n2;
int comp;
strbuf_setlen(&buffer1, len1);
strbuf_setlen(&buffer2, len2);
if (i1 == p1.nr)
comp = 1;
else if (i2 == p2.nr)
comp = -1;
else
comp = strcmp(p1.items[i1].string, p2.items[i2].string);
if (comp > 0)
n1 = NULL;
else {
strbuf_addstr(&buffer1, p1.items[i1++].string);
n1 = buffer1.buf;
}
if (comp < 0)
n2 = NULL;
else {
strbuf_addstr(&buffer2, p2.items[i2++].string);
n2 = buffer2.buf;
}
ret = queue_diff(o, n1, n2);
}
string_list_clear(&p1, 0);
string_list_clear(&p2, 0);
strbuf_release(&buffer1);
strbuf_release(&buffer2);
return ret;
} else {
struct diff_filespec *d1, *d2;
if (o->flags.reverse_diff) {
SWAP(mode1, mode2);
SWAP(name1, name2);
}
d1 = noindex_filespec(name1, mode1);
d2 = noindex_filespec(name2, mode2);
diff_queue(&diff_queued_diff, d1, d2);
return 0;
}
}
/* append basename of F to D */
static void append_basename(struct strbuf *path, const char *dir, const char *file)
{
const char *tail = strrchr(file, '/');
strbuf_addstr(path, dir);
while (path->len && path->buf[path->len - 1] == '/')
path->len--;
strbuf_addch(path, '/');
strbuf_addstr(path, tail ? tail + 1 : file);
}
/*
* DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F"
* Note that we append the basename of F to D/, so "diff a/b/file D"
* becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file".
*/
static void fixup_paths(const char **path, struct strbuf *replacement)
{
unsigned int isdir0, isdir1;
if (path[0] == file_from_standard_input ||
path[1] == file_from_standard_input)
return;
isdir0 = is_directory(path[0]);
isdir1 = is_directory(path[1]);
if (isdir0 == isdir1)
return;
if (isdir0) {
append_basename(replacement, path[0], path[1]);
path[0] = replacement->buf;
} else {
append_basename(replacement, path[1], path[0]);
path[1] = replacement->buf;
}
}
void diff_no_index(struct rev_info *revs,
int argc, const char **argv)
{
int i;
const char *paths[2];
struct strbuf replacement = STRBUF_INIT;
const char *prefix = revs->prefix;
for (i = 1; i < argc - 2; ) {
int j;
if (!strcmp(argv[i], "--no-index"))
i++;
else if (!strcmp(argv[i], "--"))
i++;
else {
j = diff_opt_parse(&revs->diffopt, argv + i, argc - i,
revs->prefix);
if (j <= 0)
die("invalid diff option/value: %s", argv[i]);
i += j;
}
}
for (i = 0; i < 2; i++) {
const char *p = argv[argc - 2 + i];
if (!strcmp(p, "-"))
/*
* stdin should be spelled as "-"; if you have
* path that is "-", spell it as "./-".
*/
p = file_from_standard_input;
else if (prefix)
p = prefix_filename(prefix, p);
paths[i] = p;
}
fixup_paths(paths, &replacement);
revs->diffopt.skip_stat_unmatch = 1;
if (!revs->diffopt.output_format)
revs->diffopt.output_format = DIFF_FORMAT_PATCH;
revs->diffopt.flags.no_index = 1;
revs->diffopt.flags.relative_name = 1;
revs->diffopt.prefix = prefix;
revs->max_count = -2;
diff_setup_done(&revs->diffopt);
setup_diff_pager(&revs->diffopt);
revs->diffopt.flags.exit_with_status = 1;
if (queue_diff(&revs->diffopt, paths[0], paths[1]))
exit(1);
diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/");
diffcore_std(&revs->diffopt);
diff_flush(&revs->diffopt);
strbuf_release(&replacement);
/*
* The return code for --no-index imitates diff(1):
* 0 = no changes, 1 = changes, else error
*/
exit(diff_result_code(&revs->diffopt, 0));
}