Pass flags to the regex engine to correct anchors

Current behaviour was matching ^ $ for the current search start/end
(and \b was always matching begin/end as well).

Fixes #536

1 files changed, 22 insertions, 0 deletions

diff --git a/src/buffer_utils.hh b/src/buffer_utils.hh
index 3851ee65..8e7fe5dc 100644
--- a/src/buffer_utils.hh
+++ b/src/buffer_utils.hh
@@ -4,6 +4,9 @@
 #include "buffer.hh"
 #include "selection.hh"
 
+#include "utf8_iterator.hh"
+#include "unicode.hh"
+
 namespace Kakoune
 {
 
@@ -24,6 +27,25 @@ inline CharCount char_length(const Buffer& buffer, const Selection& range)
                           buffer.iterator_at(buffer.char_next(range.max())));
 }
 
+inline bool is_bol(ByteCoord coord)
+{
+    return coord.column == 0;
+}
+
+inline bool is_eol(const Buffer& buffer, ByteCoord coord)
+{
+    return buffer.is_end(coord) or buffer[coord.line].length() == coord.column+1;
+}
+
+inline bool is_eow(const Buffer& buffer, ByteCoord coord)
+{
+    if (buffer.is_end(coord) or coord == ByteCoord{0,0})
+        return true;
+
+    auto it = utf8::iterator<BufferIterator>(buffer.iterator_at(coord), buffer);
+    return is_word(*(it-1)) and not is_word(*it);
+}
+
 CharCount get_column(const Buffer& buffer,
                      CharCount tabstop, ByteCoord coord);