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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 "git2/attr.h"
#include "diff.h"
#include "diff_patch.h"
#include "diff_driver.h"
#include "strmap.h"
#include "pool.h"
#include "map.h"
#include "buf_text.h"
GIT__USE_STRMAP;
typedef enum {
DIFF_DRIVER_AUTO = 0,
DIFF_DRIVER_FALSE = 1,
DIFF_DRIVER_TRUE = 2,
DIFF_DRIVER_NAMED = 3,
} git_diff_driver_t;
enum {
DIFF_CONTEXT_FIND_NORMAL = 0,
DIFF_CONTEXT_FIND_ICASE = (1 << 0),
DIFF_CONTEXT_FIND_EXT = (1 << 1),
};
/* data for finding function context for a given file type */
struct git_diff_driver {
git_diff_driver_t type;
git_strarray fn_patterns;
int binary; /* 0 => treat as text, 1 => treat as binary, -1 => auto */
};
struct git_diff_driver_registry {
git_strmap *drivers;
git_pool strings;
};
static git_diff_driver global_drivers[3] = {
{ DIFF_DRIVER_AUTO, { NULL, 0 }, -1 },
{ DIFF_DRIVER_FALSE, { NULL, 0 }, 1 },
{ DIFF_DRIVER_TRUE, { NULL, 0 }, 0 },
};
git_diff_driver_registry *git_diff_driver_registry_new()
{
git_diff_driver_registry *reg =
git__calloc(1, sizeof(git_diff_driver_registry));
if (!reg)
return NULL;
if (git_pool_init(®->strings, 1, 0) < 0 ||
(reg->drivers = git_strmap_alloc()) == NULL)
{
git_diff_driver_registry_free(reg);
return NULL;
}
return reg;
}
void git_diff_driver_registry_free(git_diff_driver_registry *reg)
{
if (!reg)
return;
git_strmap_free(reg->drivers);
git_pool_clear(®->strings);
git__free(reg);
}
static int git_diff_driver_load(
git_diff_driver **out, git_repository *repo, const char *name)
{
GIT_UNUSED(out);
GIT_UNUSED(repo);
GIT_UNUSED(name);
return GIT_ENOTFOUND;
}
int git_diff_driver_lookup(
git_diff_driver **out, git_repository *repo, const char *path)
{
int error = 0;
const char *value;
assert(out);
if (!repo || !path || !strlen(path))
goto use_auto;
if ((error = git_attr_get(&value, repo, 0, path, "diff")) < 0)
return error;
if (GIT_ATTR_FALSE(value)) {
*out = &global_drivers[DIFF_DRIVER_FALSE];
return 0;
}
else if (GIT_ATTR_TRUE(value)) {
*out = &global_drivers[DIFF_DRIVER_TRUE];
return 0;
}
/* otherwise look for driver information in config and build driver */
if ((error = git_diff_driver_load(out, repo, value)) < 0) {
if (error != GIT_ENOTFOUND)
return error;
else
giterr_clear();
}
use_auto:
*out = &global_drivers[DIFF_DRIVER_AUTO];
return 0;
}
void git_diff_driver_free(git_diff_driver *driver)
{
GIT_UNUSED(driver);
/* do nothing for now */
}
int git_diff_driver_is_binary(git_diff_driver *driver)
{
return driver ? driver->binary : -1;
}
int git_diff_driver_content_is_binary(
git_diff_driver *driver, const char *content, size_t content_len)
{
const git_buf search = { (char *)content, 0, min(content_len, 4000) };
GIT_UNUSED(driver);
/* TODO: provide encoding / binary detection callbacks that can
* be UTF-8 aware, etc. For now, instead of trying to be smart,
* let's just use the simple NUL-byte detection that core git uses.
*/
/* previously was: if (git_buf_text_is_binary(&search)) */
if (git_buf_text_contains_nul(&search))
return 1;
return 0;
}
static long diff_context_find(
const char *line,
long line_len,
char *out,
long out_size,
void *payload)
{
git_diff_driver *driver = payload;
const char *scan;
GIT_UNUSED(driver);
if (line_len > 0 && line[line_len - 1] == '\n')
line_len--;
if (line_len > 0 && line[line_len - 1] == '\r')
line_len--;
if (!line_len)
return -1;
if (!git__isalpha(*line) && *line != '_' && *line != '$')
return -1;
for (scan = &line[line_len-1]; scan > line && git__isspace(*scan); --scan)
/* search backward for non-space */;
line_len = scan - line;
if (line_len >= out_size)
line_len = out_size - 1;
memcpy(out, line, line_len);
out[line_len] = '\0';
return line_len;
}
git_diff_find_context_fn git_diff_driver_find_content_fn(git_diff_driver *driver)
{
GIT_UNUSED(driver);
return diff_context_find;
}
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