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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 "vector.h"

#include "diff.h"

#include "patch_generate.h"

#define DIFF_RENAME_FILE_SEPARATOR " => "

#define STATS_FULL_MIN_SCALE 7

typedef struct {

size_t insertions;

size_t deletions;

} diff_file_stats;

struct git_diff_stats {

git_diff *diff;

diff_file_stats *filestats;

size_t files_changed;

size_t insertions;

size_t deletions;

size_t renames;

size_t max_name;

size_t max_filestat;

int max_digits;

};

static int digits_for_value(size_t val)

{

int count = 1;

size_t placevalue = 10;

while (val >= placevalue) {

++count;

placevalue *= 10;

}

return count;

}

int git_diff_file_stats__full_to_buf(

git_buf *out,

const git_diff_delta *delta,

const diff_file_stats *filestat,

const git_diff_stats *stats,

size_t width)

{

const char *old_path = NULL, *new_path = NULL;

size_t padding, old_size, new_size;

old_path = delta->old_file.path;

new_path = delta->new_file.path;

old_size = delta->old_file.size;

new_size = delta->new_file.size;

if (git_buf_printf(out, " %s", old_path) < 0)

goto on_error;

if (strcmp(old_path, new_path) != 0) {

padding = stats->max_name - strlen(old_path) - strlen(new_path);

if (git_buf_printf(out, DIFF_RENAME_FILE_SEPARATOR "%s", new_path) < 0)

goto on_error;

} else {

padding = stats->max_name - strlen(old_path);

if (stats->renames > 0)

padding += strlen(DIFF_RENAME_FILE_SEPARATOR);

}

if (git_buf_putcn(out, ' ', padding) < 0 ||

git_buf_puts(out, " | ") < 0)

goto on_error;

if (delta->flags & GIT_DIFF_FLAG_BINARY) {

if (git_buf_printf(out,

"Bin %" PRIuZ " -> %" PRIuZ " bytes", old_size, new_size) < 0)

goto on_error;

}

else {

if (git_buf_printf(out,

"%*" PRIuZ, stats->max_digits,

filestat->insertions + filestat->deletions) < 0)

goto on_error;

if (filestat->insertions || filestat->deletions) {

if (git_buf_putc(out, ' ') < 0)

goto on_error;

if (!width) {

if (git_buf_putcn(out, '+', filestat->insertions) < 0 ||

git_buf_putcn(out, '-', filestat->deletions) < 0)

goto on_error;

} else {

size_t total = filestat->insertions + filestat->deletions;

size_t full = (total * width + stats->max_filestat / 2) /

stats->max_filestat;

size_t plus = full * filestat->insertions / total;

size_t minus = full - plus;

if (git_buf_putcn(out, '+', max(plus, 1)) < 0 ||

git_buf_putcn(out, '-', max(minus, 1)) < 0)

goto on_error;

}

}

}

git_buf_putc(out, '\n');

on_error:

return (git_buf_oom(out) ? -1 : 0);

}

int git_diff_file_stats__number_to_buf(

git_buf *out,

const git_diff_delta *delta,

const diff_file_stats *filestats)

{

int error;

const char *path = delta->new_file.path;

if (delta->flags & GIT_DIFF_FLAG_BINARY)

error = git_buf_printf(out, "%-8c" "%-8c" "%s\n", '-', '-', path);

else

error = git_buf_printf(out, "%-8" PRIuZ "%-8" PRIuZ "%s\n",

filestats->insertions, filestats->deletions, path);

return error;

}

int git_diff_file_stats__summary_to_buf(

git_buf *out,

const git_diff_delta *delta)

{

if (delta->old_file.mode != delta->new_file.mode) {

if (delta->old_file.mode == 0) {

git_buf_printf(out, " create mode %06o %s\n",

delta->new_file.mode, delta->new_file.path);

}

else if (delta->new_file.mode == 0) {

git_buf_printf(out, " delete mode %06o %s\n",

delta->old_file.mode, delta->old_file.path);

}

else {

git_buf_printf(out, " mode change %06o => %06o %s\n",

delta->old_file.mode, delta->new_file.mode, delta->new_file.path);

}

}

return 0;

}

int git_diff_get_stats(

git_diff_stats **out,

git_diff *diff)

{

size_t i, deltas;

size_t total_insertions = 0, total_deletions = 0;

git_diff_stats *stats = NULL;

int error = 0;

assert(out && diff);

stats = git__calloc(1, sizeof(git_diff_stats));

GITERR_CHECK_ALLOC(stats);

deltas = git_diff_num_deltas(diff);

stats->filestats = git__calloc(deltas, sizeof(diff_file_stats));

if (!stats->filestats) {

git__free(stats);

return -1;

}

stats->diff = diff;

GIT_REFCOUNT_INC(diff);

for (i = 0; i < deltas && !error; ++i) {

git_patch *patch = NULL;

size_t add = 0, remove = 0, namelen;

const git_diff_delta *delta;

if ((error = git_patch_from_diff(&patch, diff, i)) < 0)

break;

/* keep a count of renames because it will affect formatting */

delta = patch->delta;

/* TODO ugh */

namelen = strlen(delta->new_file.path);

if (strcmp(delta->old_file.path, delta->new_file.path) != 0) {

namelen += strlen(delta->old_file.path);

stats->renames++;

}

/* and, of course, count the line stats */

error = git_patch_line_stats(NULL, &add, &remove, patch);

git_patch_free(patch);

stats->filestats[i].insertions = add;

stats->filestats[i].deletions = remove;

total_insertions += add;

total_deletions += remove;

if (stats->max_name < namelen)

stats->max_name = namelen;

if (stats->max_filestat < add + remove)

stats->max_filestat = add + remove;

}

stats->files_changed = deltas;

stats->insertions = total_insertions;

stats->deletions = total_deletions;

stats->max_digits = digits_for_value(stats->max_filestat + 1);

if (error < 0) {

git_diff_stats_free(stats);

stats = NULL;

}

*out = stats;

return error;

}

size_t git_diff_stats_files_changed(

const git_diff_stats *stats)

{

assert(stats);

return stats->files_changed;

}

size_t git_diff_stats_insertions(

const git_diff_stats *stats)

{

assert(stats);

return stats->insertions;

}

size_t git_diff_stats_deletions(

const git_diff_stats *stats)

{

assert(stats);

return stats->deletions;

}

int git_diff_stats_to_buf(

git_buf *out,

const git_diff_stats *stats,

git_diff_stats_format_t format,

size_t width)

{

int error = 0;

size_t i;

const git_diff_delta *delta;

assert(out && stats);

if (format & GIT_DIFF_STATS_NUMBER) {

for (i = 0; i < stats->files_changed; ++i) {

if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)

continue;

error = git_diff_file_stats__number_to_buf(

out, delta, &stats->filestats[i]);

if (error < 0)

return error;

}

}

if (format & GIT_DIFF_STATS_FULL) {

if (width > 0) {

if (width > stats->max_name + stats->max_digits + 5)

width -= (stats->max_name + stats->max_digits + 5);

if (width < STATS_FULL_MIN_SCALE)

width = STATS_FULL_MIN_SCALE;

}

if (width > stats->max_filestat)

width = 0;

for (i = 0; i < stats->files_changed; ++i) {

if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)

continue;

error = git_diff_file_stats__full_to_buf(

out, delta, &stats->filestats[i], stats, width);

if (error < 0)

return error;

}

}

if (format & GIT_DIFF_STATS_FULL || format & GIT_DIFF_STATS_SHORT) {

git_buf_printf(

out, " %" PRIuZ " file%s changed",

stats->files_changed, stats->files_changed != 1 ? "s" : "");

if (stats->insertions || stats->deletions == 0)

git_buf_printf(

out, ", %" PRIuZ " insertion%s(+)",

stats->insertions, stats->insertions != 1 ? "s" : "");

if (stats->deletions || stats->insertions == 0)

git_buf_printf(

out, ", %" PRIuZ " deletion%s(-)",

stats->deletions, stats->deletions != 1 ? "s" : "");

git_buf_putc(out, '\n');

if (git_buf_oom(out))

return -1;

}

if (format & GIT_DIFF_STATS_INCLUDE_SUMMARY) {

for (i = 0; i < stats->files_changed; ++i) {

if ((delta = git_diff_get_delta(stats->diff, i)) == NULL)

continue;

error = git_diff_file_stats__summary_to_buf(out, delta);

if (error < 0)

return error;

}

}

return error;

}

void git_diff_stats_free(git_diff_stats *stats)

{

if (stats == NULL)

return;

git_diff_free(stats->diff); /* bumped refcount in constructor */

git__free(stats->filestats);

git__free(stats);

}