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