+/*
+ * move authors of matched messages in the thread to
+ * the front of the authors list, but keep them in
+ * existing order within their group
+ */
+static void
+_thread_move_matched_author (notmuch_thread_t *thread,
+ const char *author)
+{
+ char *authors_copy;
+ char *current_author;
+ char *last_pipe,*next_pipe;
+ int idx,nm_start,author_len,authors_len;
+
+ if (thread->authors == NULL || author == NULL)
+ return;
+ if (thread->nonmatched_authors == NULL)
+ thread->nonmatched_authors = thread->authors;
+ author_len = strlen(author);
+ authors_len = strlen(thread->authors);
+ if (author_len == authors_len) {
+ /* just one author */
+ thread->nonmatched_authors += author_len;
+ return;
+ }
+ current_author = strcasestr(thread->authors, author);
+ if (current_author == NULL)
+ return;
+ /* how far inside the nonmatched authors is our author? */
+ idx = current_author - thread->nonmatched_authors;
+ if (idx < 0) {
+ /* already among matched authors */
+ return;
+ }
+ /* are there any authors in the list after our author? */
+ if (thread->nonmatched_authors + author_len < thread->authors + authors_len) {
+ /* we have to make changes, so let's get a temp copy */
+ authors_copy = talloc_strdup(thread,thread->authors);
+ /* nm_start is the offset into where the non-matched authors start */
+ nm_start = thread->nonmatched_authors - thread->authors;
+ /* copy this author and add the "| " - the if clause above tells us there's more */
+ strncpy(thread->nonmatched_authors,author,author_len);
+ strncpy(thread->nonmatched_authors+author_len,"| ",2);
+ thread->nonmatched_authors += author_len+2;
+ if (idx > 0) {
+ /* we are actually moving authors around, not just changing the separator
+ * first copy the authors that came BEFORE our author */
+ strncpy(thread->nonmatched_authors, authors_copy+nm_start, idx-2);
+ /* finally, if there are authors AFTER our author, copy those */
+ if(author_len+nm_start+idx < authors_len) {
+ strncpy(thread->nonmatched_authors + idx - 2,", ",2);
+ strncpy(thread->nonmatched_authors + idx, authors_copy+nm_start + idx + author_len + 2,
+ authors_len - (nm_start + idx + author_len + 2));
+ }
+ }
+ /* finally let's make sure there's just one '|' in the authors string */
+ last_pipe = strchr(thread->authors,'|');
+ while (last_pipe) {
+ next_pipe = strchr(last_pipe+1,'|');
+ if (next_pipe)
+ *last_pipe = ',';
+ last_pipe = next_pipe;
+ }
+ } else {
+ thread->nonmatched_authors += author_len;
+ /* so now all authors are matched - let's remove the '|' */
+ last_pipe = strchr(thread->authors,'|');
+ if (last_pipe)
+ *last_pipe = ',';
+ }
+ return;
+}
+