Lsp completion logic

include/editor/completions.h

@@ -0,0 +1,44 @@
+#ifndef EDITOR_COMPLETIONS_H
+#define EDITOR_COMPLETIONS_H
+
+#include "editor/decl.h"
+#include "pch.h"
+#include "ui/completionbox.h"
+#include "utils/utils.h"
+
+struct CompletionItem {
+  std::string label;                        // Shown in the autocomplete box
+  uint8_t kind;                             // Function, variable, class, etc.
+  std::optional<std::string> detail;        // Shown greyed in autocomplete box
+  std::optional<std::string> documentation; // Hover box (can be lazy-loaded)
+  bool is_markup = false;
+  bool deprecated = false; // Shown with strikethrough, may push down in list
+  std::string sort;        // Used for sorting
+  std::string filter;      // Used for filtering (default: label)
+  bool snippet = false;
+  std::vector<TextEdit> edits;
+  json original;
+  std::vector<char> end_chars; // Ends completion session if typed
+};
+
+struct CompletionSession {
+  std::shared_mutex mtx;
+
+  bool active = false;
+  Coord hook;                        // set to start of word
+  std::optional<std::string> prefix; // text between hook and cursor
+  uint8_t select = 0; // index of selected item (defualts to preselcted one
+                      // when data requested)
+  std::vector<CompletionItem> items;
+  std::vector<uint8_t> visible;
+  bool complete = true; // If false, client may request more items on filter
+                        // (but doesnt try filtering on its own)
+  std::optional<char> trigger_char; // Character that triggered completion sent
+                                    // to lsp for isIncomplete resolving
+  uint8_t trigger = 0; // Type of trigger (1: manual, 2: trigger char, 3: auto)
+  CompletionBox box;
+
+  CompletionSession() : box(this) {}
+};
+
+#endif