Basic lsp and precompiler header support

include/lsp.h

@@ -0,0 +1,56 @@
+#ifndef LSP_H
+#define LSP_H
+
+#include "./editor.h"
+#include "./pch.h"
+#include "utils.h"
+
+struct LSP {
+  const char *command;
+  std::vector<const char *> args;
+};
+
+struct LSPPending {
+  std::string method;
+  Editor *editor = nullptr;
+
+  std::function<void(Editor *, std::string, json)> callback;
+};
+
+struct LSPOpenRequest {
+  Language language;
+  Editor *editor;
+};
+
+struct LSPInstance {
+  std::shared_mutex mtx;
+  LSP *lsp;
+  std::string root_dir;
+  int pid{-1};
+  int stdin_fd{-1};
+  int stdout_fd{-1};
+  bool initialized = false;
+  uint32_t last_id = 0;
+  Queue<json> inbox;
+  Queue<json> outbox;
+  std::unordered_map<uint32_t, LSPPending *> pending;
+  std::vector<Editor *> editors;
+};
+
+extern std::shared_mutex active_lsps_mtx;
+extern std::unordered_map<uint8_t, LSPInstance *> active_lsps;
+extern std::unordered_map<uint8_t, LSP> lsp_map;
+
+void lsp_worker();
+void lsp_handle(LSPInstance *lsp, json message);
+
+LSPInstance *get_or_init_lsp(uint8_t lsp_id);
+void close_lsp(uint8_t lsp_id);
+
+void request_add_to_lsp(Language language, Editor *editor);
+void add_to_lsp(Language language, Editor *editor);
+void remove_from_lsp(Editor *editor);
+
+void lsp_send(LSPInstance *lsp, json message, LSPPending *pending);
+
+#endif