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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/config.h"

/* Tweaked from Core Git. I wonder what we could use this for... */

void git_text_gather_stats(git_text_stats *stats, const git_buf *text)

{

size_t i;

memset(stats, 0, sizeof(*stats));

for (i = 0; i < git_buf_len(text); i++) {

unsigned char c = text->ptr[i];

if (c == '\r') {

stats->cr++;

if (i + 1 < git_buf_len(text) && text->ptr[i + 1] == '\n')

stats->crlf++;

}

else if (c == '\n')

stats->lf++;

else if (c == 0x85)

/* Unicode CR+LF */

stats->crlf++;

else if (c == 127)

/* DEL */

stats->nonprintable++;

else if (c <= 0x1F || (c >= 0x80 && c <= 0x9F)) {

switch (c) {

/* BS, HT, ESC and FF */

case '\b': case '\t': case '\033': case '\014':

stats->printable++;

break;

case 0:

stats->nul++;

/* fall through */

default:

stats->nonprintable++;

}

}

else

stats->printable++;

}

/* If file ends with EOF then don't count this EOF as non-printable. */

if (git_buf_len(text) >= 1 && text->ptr[text->size - 1] == '\032')

stats->nonprintable--;

}

/*

* Fresh from Core Git

*/

int git_text_is_binary(git_text_stats *stats)

{

if (stats->nul)

return 1;

if ((stats->printable >> 7) < stats->nonprintable)

return 1;

/*

* Other heuristics? Average line length might be relevant,

* as might LF vs CR vs CRLF counts..

*

* NOTE! It might be normal to have a low ratio of CRLF to LF

* (somebody starts with a LF-only file and edits it with an editor

* that adds CRLF only to lines that are added..). But do we

* want to support CR-only? Probably not.

*/

return 0;

}

int git_filters_load(git_vector *filters, git_repository *repo, const char *path, int mode)

{

int error;

if (mode == GIT_FILTER_TO_ODB) {

/* Load the CRLF cleanup filter when writing to the ODB */

error = git_filter_add__crlf_to_odb(filters, repo, path);

if (error < 0)

return error;

} else {

giterr_set(GITERR_INVALID, "Worktree filters are not implemented yet");

return -1;

}

return (int)filters->length;

}

void git_filters_free(git_vector *filters)

{

size_t i;

git_filter *filter;

git_vector_foreach(filters, i, filter) {

if (filter->do_free != NULL)

filter->do_free(filter);

else

git__free(filter);

}

git_vector_free(filters);

}

int git_filters_apply(git_buf *dest, git_buf *source, git_vector *filters)

{

unsigned int i, src;

git_buf *dbuffer[2];

dbuffer[0] = source;

dbuffer[1] = dest;

src = 0;

if (git_buf_len(source) == 0) {

git_buf_clear(dest);

return 0;

}

/* Pre-grow the destination buffer to more or less the size

* we expect it to have */

if (git_buf_grow(dest, git_buf_len(source)) < 0)

return -1;

for (i = 0; i < filters->length; ++i) {

git_filter *filter = git_vector_get(filters, i);

unsigned int dst = 1 - src;

git_buf_clear(dbuffer[dst]);

/* Apply the filter from dbuffer[src] to the other buffer;

* if the filtering is canceled by the user mid-filter,

* we skip to the next filter without changing the source

* of the double buffering (so that the text goes through

* cleanly).

*/

if (filter->apply(filter, dbuffer[dst], dbuffer[src]) == 0)

src = dst;

if (git_buf_oom(dbuffer[dst]))

return -1;

}

/* Ensure that the output ends up in dbuffer[1] (i.e. the dest) */

if (src != 1)

git_buf_swap(dest, source);

return 0;

}