Support `%` in `path` option to mean current buffer directory

In the end, % is not that painful to work with as its only set seldomly,
and we usually dont need to use expansion at the same time. Moreover, it
just requires a single \ to be escaped.

Fixes #1562

1 files changed, 7 insertions, 0 deletions

diff --git a/src/insert_completer.cc b/src/insert_completer.cc
index 5bd1efe7..8db65556 100644
--- a/src/insert_completer.cc
+++ b/src/insert_completer.cc
@@ -246,6 +246,13 @@ InsertCompletion complete_filename(const SelectionList& sels,
         {
             if (not dir.empty() and dir.back() != '/')
                 dir += '/';
+            if (dir.substr(0, 2_byte) == "%/")
+            {
+                if (not (buffer.flags() & Buffer::Flags::File))
+                    continue;
+                dir = split_path(buffer.name()).first.str() + '/' + dir.substr(2_byte);
+            }
+
             for (auto& filename : Kakoune::complete_filename(dir + prefix,
                                                              options["ignored_files"].get<Regex>()))
             {