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-rw-r--r--ui-ssdiff.c264
1 files changed, 264 insertions, 0 deletions
diff --git a/ui-ssdiff.c b/ui-ssdiff.c
new file mode 100644
index 0000000..3591ab4
--- /dev/null
+++ b/ui-ssdiff.c
@@ -0,0 +1,264 @@
+#include "cgit.h"
+#include "html.h"
+#include "ui-shared.h"
+
+extern int use_ssdiff;
+
+static int current_old_line, current_new_line;
+
+struct deferred_lines {
+ int line_no;
+ char *line;
+ struct deferred_lines *next;
+};
+
+static struct deferred_lines *deferred_old, *deferred_old_last;
+static struct deferred_lines *deferred_new, *deferred_new_last;
+
+static int line_from_hunk(char *line, char type)
+{
+ char *buf1, *buf2;
+ int len;
+
+ buf1 = strchr(line, type);
+ if (buf1 == NULL)
+ return 0;
+ buf1 += 1;
+ buf2 = strchr(buf1, ',');
+ if (buf2 == NULL)
+ return 0;
+ len = buf2 - buf1;
+ buf2 = xmalloc(len + 1);
+ strncpy(buf2, buf1, len);
+ buf2[len] = '\0';
+ int res = atoi(buf2);
+ free(buf2);
+ return res;
+}
+
+static char *replace_tabs(char *line)
+{
+ char *prev_buf = line;
+ char *cur_buf;
+ int linelen = strlen(line);
+ int n_tabs = 0;
+ int i;
+ char *result;
+ char *spaces = " ";
+
+ if (linelen == 0) {
+ result = xmalloc(1);
+ result[0] = '\0';
+ return result;
+ }
+
+ for (i = 0; i < linelen; i++)
+ if (line[i] == '\t')
+ n_tabs += 1;
+ result = xmalloc(linelen + n_tabs * 8 + 1);
+ result[0] = '\0';
+
+ while (1) {
+ cur_buf = strchr(prev_buf, '\t');
+ if (!cur_buf) {
+ strcat(result, prev_buf);
+ break;
+ } else {
+ strcat(result, " ");
+ strncat(result, spaces, 8 - (strlen(result) % 8));
+ strncat(result, prev_buf, cur_buf - prev_buf);
+ }
+ prev_buf = cur_buf + 1;
+ }
+ return result;
+}
+
+static void deferred_old_add(char *line, int line_no)
+{
+ struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
+ item->line = xstrdup(line);
+ item->line_no = line_no;
+ item->next = NULL;
+ if (deferred_old) {
+ deferred_old_last->next = item;
+ deferred_old_last = item;
+ } else {
+ deferred_old = deferred_old_last = item;
+ }
+}
+
+static void deferred_new_add(char *line, int line_no)
+{
+ struct deferred_lines *item = xmalloc(sizeof(struct deferred_lines));
+ item->line = xstrdup(line);
+ item->line_no = line_no;
+ item->next = NULL;
+ if (deferred_new) {
+ deferred_new_last->next = item;
+ deferred_new_last = item;
+ } else {
+ deferred_new = deferred_new_last = item;
+ }
+}
+
+static void print_ssdiff_line(char *class, int old_line_no, char *old_line,
+ int new_line_no, char *new_line)
+{
+ html("<tr>");
+ if (old_line_no > 0)
+ htmlf("<td class='%s'>%d </td><td class='%s'>", class,
+ old_line_no, class);
+ else
+ htmlf("<td class='%s_dark'> </td><td class='%s_dark'>", class, class);
+
+ if (old_line) {
+ old_line = replace_tabs(old_line + 1);
+ html_txt(old_line);
+ free(old_line);
+ }
+
+ html(" </td>");
+
+ if (new_line_no > 0)
+ htmlf("<td class='%s'> %d </td><td class='%s'>", class,
+ new_line_no, class);
+ else
+ htmlf("<td class='%s_dark'> </td><td class='%s_dark'>", class, class);
+
+ if (new_line) {
+ new_line = replace_tabs(new_line + 1);
+ html_txt(new_line);
+ free(new_line);
+ }
+
+ html("</td></tr>");
+}
+
+static void print_deferred_old_lines()
+{
+ struct deferred_lines *iter_old, *tmp;
+
+ iter_old = deferred_old;
+ while (iter_old) {
+ print_ssdiff_line("del", iter_old->line_no,
+ iter_old->line, -1, NULL);
+ tmp = iter_old->next;
+ free(iter_old);
+ iter_old = tmp;
+ }
+}
+
+static void print_deferred_new_lines()
+{
+ struct deferred_lines *iter_new, *tmp;
+
+ iter_new = deferred_new;
+ while (iter_new) {
+ print_ssdiff_line("add", -1, NULL, iter_new->line_no,
+ iter_new->line);
+ tmp = iter_new->next;
+ free(iter_new);
+ iter_new = tmp;
+ }
+}
+
+static void print_deferred_changed_lines()
+{
+ struct deferred_lines *iter_old, *iter_new, *tmp;
+
+ iter_old = deferred_old;
+ iter_new = deferred_new;
+ while (iter_old || iter_new) {
+ if (iter_old && iter_new)
+ print_ssdiff_line("changed", iter_old->line_no,
+ iter_old->line,
+ iter_new->line_no, iter_new->line);
+ else if (iter_old)
+ print_ssdiff_line("changed", iter_old->line_no,
+ iter_old->line, -1, NULL);
+ else if (iter_new)
+ print_ssdiff_line("changed", -1, NULL,
+ iter_new->line_no, iter_new->line);
+
+ if (iter_old) {
+ tmp = iter_old->next;
+ free(iter_old);
+ iter_old = tmp;
+ }
+
+ if (iter_new) {
+ tmp = iter_new->next;
+ free(iter_new);
+ iter_new = tmp;
+ }
+ }
+}
+
+void cgit_ssdiff_print_deferred_lines()
+{
+ if (!deferred_old && !deferred_new)
+ return;
+
+ if (deferred_old && !deferred_new)
+ print_deferred_old_lines();
+ else if (!deferred_old && deferred_new)
+ print_deferred_new_lines();
+ else
+ print_deferred_changed_lines();
+
+ deferred_old = deferred_old_last = NULL;
+ deferred_new = deferred_new_last = NULL;
+}
+
+/*
+ * print a single line returned from xdiff
+ */
+void cgit_ssdiff_line_cb(char *line, int len)
+{
+ char c = line[len - 1];
+
+ line[len - 1] = '\0';
+
+ if (line[0] == '@') {
+ current_old_line = line_from_hunk(line, '-');
+ current_new_line = line_from_hunk(line, '+');
+ }
+
+ if (line[0] == ' ') {
+ if (deferred_old || deferred_new)
+ cgit_ssdiff_print_deferred_lines();
+ print_ssdiff_line("ctx", current_old_line, line,
+ current_new_line, line);
+ current_old_line += 1;
+ current_new_line += 1;
+ } else if (line[0] == '+') {
+ deferred_new_add(line, current_new_line);
+ current_new_line += 1;
+ } else if (line[0] == '-') {
+ deferred_old_add(line, current_old_line);
+ current_old_line += 1;
+ } else if (line[0] == '@') {
+ html("<tr><td colspan='4' class='hunk'>");
+ html_txt(line);
+ html("</td></tr>");
+ } else {
+ html("<tr><td colspan='4' class='ctx'>");
+ html_txt(line);
+ html("</td></tr>");
+ }
+ line[len - 1] = c;
+}
+
+void cgit_ssdiff_header()
+{
+ current_old_line = 0;
+ current_new_line = 0;
+ html("<table class='ssdiff'>");
+}
+
+void cgit_ssdiff_footer()
+{
+ if (deferred_old || deferred_new)
+ cgit_ssdiff_print_deferred_lines();
+ html("</table>");
+}