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/* ui-diff.c: show diff between two blobs
*
* Copyright (C) 2006 Lars Hjemli
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#include "cgit.h"
char *diff_buffer;
int diff_buffer_size;
/*
* print a single line returned from xdiff
*/
static void print_line(char *line, int len)
{
char *class = "ctx";
char c = line[len-1];
if (line[0] == '+')
class = "add";
else if (line[0] == '-')
class = "del";
else if (line[0] == '@')
class = "hunk";
htmlf("<div class='%s'>", class);
line[len-1] = '\0';
html_txt(line);
html("</div>");
line[len-1] = c;
}
/*
* Receive diff-buffers from xdiff and concatenate them as
* needed across multiple callbacks.
*
* This is basically a copy of xdiff-interface.c/xdiff_outf(),
* ripped from git and modified to use globals instead of
* a special callback-struct.
*/
int diff_cb(void *priv_, mmbuffer_t *mb, int nbuf)
{
int i;
for (i = 0; i < nbuf; i++) {
if (mb[i].ptr[mb[i].size-1] != '\n') {
/* Incomplete line */
diff_buffer = xrealloc(diff_buffer,
diff_buffer_size + mb[i].size);
memcpy(diff_buffer + diff_buffer_size,
mb[i].ptr, mb[i].size);
diff_buffer_size += mb[i].size;
continue;
}
/* we have a complete line */
if (!diff_buffer) {
print_line(mb[i].ptr, mb[i].size);
continue;
}
diff_buffer = xrealloc(diff_buffer,
diff_buffer_size + mb[i].size);
memcpy(diff_buffer + diff_buffer_size, mb[i].ptr, mb[i].size);
print_line(diff_buffer, diff_buffer_size + mb[i].size);
free(diff_buffer);
diff_buffer = NULL;
diff_buffer_size = 0;
}
if (diff_buffer) {
print_line(diff_buffer, diff_buffer_size);
free(diff_buffer);
diff_buffer = NULL;
diff_buffer_size = 0;
}
return 0;
}
static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
{
enum object_type type;
if (is_null_sha1(sha1)) {
file->ptr = (char *)"";
file->size = 0;
} else {
file->ptr = read_sha1_file(sha1, &type, &file->size);
}
return 1;
}
static void run_diff(const unsigned char *sha1, const unsigned char *sha2)
{
mmfile_t file1, file2;
xpparam_t diff_params;
xdemitconf_t emit_params;
xdemitcb_t emit_cb;
if (!load_mmfile(&file1, sha1) || !load_mmfile(&file2, sha2)) {
cgit_print_error("Unable to load files for diff");
return;
}
diff_params.flags = XDF_NEED_MINIMAL;
emit_params.ctxlen = 3;
emit_params.flags = XDL_EMIT_FUNCNAMES;
emit_cb.outf = diff_cb;
xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
}
void cgit_print_diff(const char *old_hex, const char *new_hex)
{
unsigned char sha1[20], sha2[20];
get_sha1(old_hex, sha1);
get_sha1(new_hex, sha2);
html("<table class='diff'><tr><td>");
run_diff(sha1, sha2);
html("</td></tr></table>");
}
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