Buffer: add filter support

filters are functions called prior to applying a modification
to a buffer. They can manipulate the modification to change
the editor behaviour.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/buffer.hh b/src/buffer.hh
index 5a336f23..0221e46a 100644
--- a/src/buffer.hh
+++ b/src/buffer.hh
@@ -7,6 +7,10 @@
 #include <memory>
 
 #include "line_and_column.hh"
+#include "filter.hh"
+#include "exception.hh"
+#include "completion.hh"
+#include "idvaluemap.hh"
 
 namespace Kakoune
 {
@@ -149,6 +153,18 @@ public:
     void register_modification_listener(BufferModificationListener* listener);
     void unregister_modification_listener(BufferModificationListener* listener);
 
+    struct filter_id_not_unique : public runtime_error
+    {
+        filter_id_not_unique(const std::string& id)
+            : runtime_error("filter id not unique: " + id) {}
+    };
+
+    void add_filter(FilterAndId&& filter);
+    void remove_filter(const std::string& id);
+
+    CandidateList complete_filterid(const std::string& prefix,
+                                    size_t cursor_pos = std::string::npos);
+
     // returns an iterator pointing to the first character of the line
     // iterator is on
     BufferIterator iterator_at_line_begin(const BufferIterator& iterator) const;
@@ -190,6 +206,8 @@ private:
     size_t m_last_save_undo_index;
 
     std::vector<BufferModificationListener*> m_modification_listeners;
+
+    idvaluemap<std::string, FilterFunc> m_filters;
 };
 
 }