refactor: replace manual header guards with #pragma once

It is less error-prone than manually defining header guards. Pretty much
all compilers support it even if it's not part of the C standard.

src/nvim/api/autocmd.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_AUTOCMD_H
-#define NVIM_API_AUTOCMD_H
+#pragma once
 
 #include <stdint.h>
 
@@ -9,4 +8,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/autocmd.h.generated.h"
 #endif
-#endif  // NVIM_API_AUTOCMD_H

src/nvim/api/buffer.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_BUFFER_H
-#define NVIM_API_BUFFER_H
+#pragma once
 
 #include <lauxlib.h>
 
@@ -10,4 +9,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/buffer.h.generated.h"
 #endif
-#endif  // NVIM_API_BUFFER_H

src/nvim/api/command.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_COMMAND_H
-#define NVIM_API_COMMAND_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -9,4 +8,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/command.h.generated.h"
 #endif
-#endif  // NVIM_API_COMMAND_H

src/nvim/api/deprecated.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_DEPRECATED_H
-#define NVIM_API_DEPRECATED_H
+#pragma once
 
 #include <stdint.h>
 
@@ -8,4 +7,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/deprecated.h.generated.h"
 #endif
-#endif  // NVIM_API_DEPRECATED_H

src/nvim/api/extmark.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_EXTMARK_H
-#define NVIM_API_EXTMARK_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -14,4 +13,3 @@ EXTERN handle_T next_namespace_id INIT( = 1);
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/extmark.h.generated.h"
 #endif
-#endif  // NVIM_API_EXTMARK_H

src/nvim/api/keysets.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_KEYSETS_H
-#define NVIM_API_KEYSETS_H
+#pragma once
 
 #include "nvim/api/private/defs.h"
 
@@ -314,5 +313,3 @@ typedef struct {
 typedef struct {
   Boolean output;
 } Dict(exec_opts);
-
-#endif  // NVIM_API_KEYSETS_H

src/nvim/api/options.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_OPTIONS_H
-#define NVIM_API_OPTIONS_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -8,5 +7,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/options.h.generated.h"
 #endif
-
-#endif  // NVIM_API_OPTIONS_H

src/nvim/api/private/converter.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_PRIVATE_CONVERTER_H
-#define NVIM_API_PRIVATE_CONVERTER_H
+#pragma once
 
 #include "nvim/api/private/defs.h"
 #include "nvim/eval/typval_defs.h"
@@ -7,5 +6,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/private/converter.h.generated.h"
 #endif
-
-#endif  // NVIM_API_PRIVATE_CONVERTER_H

src/nvim/api/private/defs.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_PRIVATE_DEFS_H
-#define NVIM_API_PRIVATE_DEFS_H
+#pragma once
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -139,5 +138,3 @@ typedef struct {
 } KeySetLink;
 
 typedef KeySetLink *(*FieldHashfn)(const char *str, size_t len);
-
-#endif  // NVIM_API_PRIVATE_DEFS_H

src/nvim/api/private/dispatch.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_PRIVATE_DISPATCH_H
-#define NVIM_API_PRIVATE_DISPATCH_H
+#pragma once
 
 #include <stdbool.h>
 #include <stdint.h>
@@ -30,5 +29,3 @@ extern const MsgpackRpcRequestHandler method_handlers[];
 # include "api/private/dispatch_wrappers.h.generated.h"
 # include "keysets_defs.generated.h"
 #endif
-
-#endif  // NVIM_API_PRIVATE_DISPATCH_H

src/nvim/api/private/helpers.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_PRIVATE_HELPERS_H
-#define NVIM_API_PRIVATE_HELPERS_H
+#pragma once
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -199,5 +198,3 @@ typedef struct {
     current_channel_id = save_channel_id; \
     current_sctx = save_current_sctx; \
   } while (0);
-
-#endif  // NVIM_API_PRIVATE_HELPERS_H

src/nvim/api/private/validate.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_PRIVATE_VALIDATE_H
-#define NVIM_API_PRIVATE_VALIDATE_H
+#pragma once
 
 #include <stdbool.h>
 #include <stddef.h>
@@ -95,5 +94,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/private/validate.h.generated.h"
 #endif
-
-#endif  // NVIM_API_PRIVATE_VALIDATE_H

src/nvim/api/tabpage.h

@@ -1,9 +1,7 @@
-#ifndef NVIM_API_TABPAGE_H
-#define NVIM_API_TABPAGE_H
+#pragma once
 
 #include "nvim/api/private/defs.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/tabpage.h.generated.h"
 #endif
-#endif  // NVIM_API_TABPAGE_H

src/nvim/api/ui.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_UI_H
-#define NVIM_API_UI_H
+#pragma once
 
 #include <stdint.h>
 
@@ -11,4 +10,3 @@
 # include "api/ui.h.generated.h"
 # include "ui_events_remote.h.generated.h"
 #endif
-#endif  // NVIM_API_UI_H

src/nvim/api/ui_events.in.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_UI_EVENTS_IN_H
-#define NVIM_API_UI_EVENTS_IN_H
+#pragma once
 
 // This file is not compiled, just parsed for definitions
 #ifdef INCLUDE_GENERATED_DECLARATIONS
@@ -170,4 +169,3 @@ void msg_history_clear(void)
 
 void error_exit(Integer status)
   FUNC_API_SINCE(12);
-#endif  // NVIM_API_UI_EVENTS_IN_H

src/nvim/api/vim.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_VIM_H
-#define NVIM_API_VIM_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -7,4 +6,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/vim.h.generated.h"
 #endif
-#endif  // NVIM_API_VIM_H

src/nvim/api/vimscript.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_VIMSCRIPT_H
-#define NVIM_API_VIMSCRIPT_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -7,4 +6,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/vimscript.h.generated.h"
 #endif
-#endif  // NVIM_API_VIMSCRIPT_H

src/nvim/api/win_config.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_WIN_CONFIG_H
-#define NVIM_API_WIN_CONFIG_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -8,4 +7,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/win_config.h.generated.h"
 #endif
-#endif  // NVIM_API_WIN_CONFIG_H

src/nvim/api/window.h

@@ -1,5 +1,4 @@
-#ifndef NVIM_API_WINDOW_H
-#define NVIM_API_WINDOW_H
+#pragma once
 
 #include "nvim/api/keysets.h"
 #include "nvim/api/private/defs.h"
@@ -7,4 +6,3 @@
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/window.h.generated.h"
 #endif
-#endif  // NVIM_API_WINDOW_H