Major update

- Add an IO system to hijack a bit of the terminal.
- Other minor fixes.

include/bed.h

@@ -4,11 +4,25 @@
 #include "internal/buffer/buffer.h"
 #include "internal/commands/commands.h"
 #include "internal/commands/suffixes.h"
+#include "internal/io/io.h"
 #include "internal/marks/marks.h"
 #include "internal/theme/theme.h"
 #include "pch.h"
 
 namespace bed {
+struct Suggestion {
+  enum : uint8_t {
+    Command,
+    Address,
+    Suffix,
+    History,
+    Regex
+  } type;
+  std::string_view name;
+  std::string_view desc;
+  std::string completion;
+};
+
 struct BEd {
   internal::trie::Trie<internal::commands::Command> commands;
   internal::commands::Command no_op;
@@ -16,6 +30,7 @@ struct BEd {
   std::array<std::optional<internal::commands::Suffix>, 26> suffixes;
   internal::theme::Theme theme;
   std::unordered_map<std::string, internal::syntax::Language> languages;
+  internal::io::IO &io;
 
   bool help_mode = false;
   std::string last_help = "";
@@ -27,7 +42,7 @@ struct BEd {
   std::unordered_map<std::string, internal::buffer::Buffer *> buffers;
   internal::buffer::Buffer *active;
 
-  BEd(std::vector<std::string> args);
+  BEd(std::vector<std::string> args, internal::io::IO &io);
   ~BEd();
   void handle(std::string_view cmd, bool eof);
   void run();