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/*
* Copyright (C) 2009-2012 the libgit2 contributors
*
* 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 "fileops.h"
#include "hash.h"
#include "filter.h"
#include "repository.h"
#include "git2/attr.h"
struct crlf_attrs {
int crlf_action;
int eol;
};
struct crlf_filter {
git_filter f;
struct crlf_attrs attrs;
};
static int check_crlf(const char *value)
{
if (GIT_ATTR_TRUE(value))
return GIT_CRLF_TEXT;
if (GIT_ATTR_FALSE(value))
return GIT_CRLF_BINARY;
if (GIT_ATTR_UNSPECIFIED(value))
return GIT_CRLF_GUESS;
if (strcmp(value, "input") == 0)
return GIT_CRLF_INPUT;
if (strcmp(value, "auto") == 0)
return GIT_CRLF_AUTO;
return GIT_CRLF_GUESS;
}
static int check_eol(const char *value)
{
if (GIT_ATTR_UNSPECIFIED(value))
return GIT_EOL_UNSET;
if (strcmp(value, "lf") == 0)
return GIT_EOL_LF;
if (strcmp(value, "crlf") == 0)
return GIT_EOL_CRLF;
return GIT_EOL_UNSET;
}
static int crlf_input_action(struct crlf_attrs *ca)
{
if (ca->crlf_action == GIT_CRLF_BINARY)
return GIT_CRLF_BINARY;
if (ca->eol == GIT_EOL_LF)
return GIT_CRLF_INPUT;
if (ca->eol == GIT_EOL_CRLF)
return GIT_CRLF_CRLF;
return ca->crlf_action;
}
static int crlf_load_attributes(struct crlf_attrs *ca, git_repository *repo, const char *path)
{
#define NUM_CONV_ATTRS 3
static const char *attr_names[NUM_CONV_ATTRS] = {
"crlf", "eol", "text",
};
const char *attr_vals[NUM_CONV_ATTRS];
int error;
error = git_attr_get_many(repo, path, NUM_CONV_ATTRS, attr_names, attr_vals);
if (error == GIT_ENOTFOUND) {
ca->crlf_action = GIT_CRLF_GUESS;
ca->eol = GIT_EOL_UNSET;
return 0;
}
if (error == GIT_SUCCESS) {
ca->crlf_action = check_crlf(attr_vals[2]); /* text */
if (ca->crlf_action == GIT_CRLF_GUESS)
ca->crlf_action = check_crlf(attr_vals[0]); /* clrf */
ca->eol = check_eol(attr_vals[1]); /* eol */
return 0;
}
return error;
}
static int drop_crlf(git_buf *dest, const git_buf *source)
{
const char *scan = source->ptr, *next;
const char *scan_end = git_buf_cstr(source) + git_buf_len(source);
/* Main scan loop. Find the next carriage return and copy the
* whole chunk up to that point to the destination buffer.
*/
while ((next = memchr(scan, '\r', scan_end - scan)) != NULL) {
/* copy input up to \r */
if (next > scan)
git_buf_put(dest, scan, next - scan);
/* Do not drop \r unless it is followed by \n */
if (*(next + 1) != '\n')
git_buf_putc(dest, '\r');
scan = next + 1;
}
/* If there was no \r, then tell the library to skip this filter */
if (scan == source->ptr)
return -1;
/* Copy remaining input into dest */
git_buf_put(dest, scan, scan_end - scan);
return 0;
}
static int crlf_apply_to_odb(git_filter *self, git_buf *dest, const git_buf *source)
{
struct crlf_filter *filter = (struct crlf_filter *)self;
assert(self && dest && source);
/* Empty file? Nothing to do */
if (git_buf_len(source) == 0)
return 0;
/* Heuristics to see if we can skip the conversion.
* Straight from Core Git.
*/
if (filter->attrs.crlf_action == GIT_CRLF_AUTO ||
filter->attrs.crlf_action == GIT_CRLF_GUESS) {
git_text_stats stats;
git_text_gather_stats(&stats, source);
/*
* We're currently not going to even try to convert stuff
* that has bare CR characters. Does anybody do that crazy
* stuff?
*/
if (stats.cr != stats.crlf)
return -1;
/*
* And add some heuristics for binary vs text, of course...
*/
if (git_text_is_binary(&stats))
return -1;
#if 0
if (crlf_action == CRLF_GUESS) {
/*
* If the file in the index has any CR in it, do not convert.
* This is the new safer autocrlf handling.
*/
if (has_cr_in_index(path))
return 0;
}
#endif
if (!stats.cr)
return -1;
}
/* Actually drop the carriage returns */
return drop_crlf(dest, source);
}
int git_filter_add__crlf_to_odb(git_vector *filters, git_repository *repo, const char *path)
{
struct crlf_attrs ca;
struct crlf_filter *filter;
int error;
/* Load gitattributes for the path */
if ((error = crlf_load_attributes(&ca, repo, path)) < 0)
return error;
/*
* Use the core Git logic to see if we should perform CRLF for this file
* based on its attributes & the value of `core.auto_crlf`
*/
ca.crlf_action = crlf_input_action(&ca);
if (ca.crlf_action == GIT_CRLF_BINARY)
return 0;
if (ca.crlf_action == GIT_CRLF_GUESS) {
int auto_crlf;
if ((error = git_repository__cvar(
&auto_crlf, repo, GIT_CVAR_AUTO_CRLF)) < GIT_SUCCESS)
return error;
if (auto_crlf == GIT_AUTO_CRLF_FALSE)
return 0;
}
/* If we're good, we create a new filter object and push it
* into the filters array */
filter = git__malloc(sizeof(struct crlf_filter));
GITERR_CHECK_ALLOC(filter);
filter->f.apply = &crlf_apply_to_odb;
filter->f.do_free = NULL;
memcpy(&filter->attrs, &ca, sizeof(struct crlf_attrs));
return git_vector_insert(filters, filter);
}
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