/* 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" #include "xdiff.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) { char type[20]; 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("<h2>diff</h2>\n"); html("<table class='diff'><tr><td>"); run_diff(sha1, sha2); html("</td></tr></table>"); }