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-rw-r--r--ui-diff.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/ui-diff.c b/ui-diff.c
new file mode 100644
index 0000000..0bd9ade
--- /dev/null
+++ b/ui-diff.c
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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"
+#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>");
+}