term.ui: fix exception thrown in GetConsoleMode on windows (stop abusing consts as globals) (#19529)

vlib/term/ui/input_nix.c.v

@@ -1,6 +1,7 @@
 // Copyright (c) 2020-2021 Raúl Hernández. All rights reserved.
 // Use of this source code is governed by an MIT license
 // that can be found in the LICENSE file.
+[has_globals]
 module ui
 
 struct ExtraContext {
@@ -11,7 +12,7 @@ mut:
 	read_all_bytes bool = true
 }
 
-const ctx_ptr = &Context(unsafe { nil })
+__global ctx_ptr = &Context(unsafe { nil })
 
 // init initializes the terminal console with Config `cfg`.
 pub fn init(cfg Config) &Context {
@@ -20,12 +21,7 @@ pub fn init(cfg Config) &Context {
 	}
 	ctx.read_buf = []u8{cap: cfg.buffer_size}
 
-	// lmao
+	ctx_ptr = ctx
-	unsafe {
-		x := &ui.ctx_ptr
-		*x = ctx
-		_ = x
-	}
 	return ctx
 }
 

vlib/term/ui/input_windows.c.v

@@ -1,6 +1,7 @@
 // Copyright (c) 2020-2021 Raúl Hernández. All rights reserved.
 // Use of this source code is governed by an MIT license
 // that can be found in the LICENSE file.
+[has_globals]
 module ui
 
 import os
@@ -8,9 +9,9 @@ import time
 
 const buf_size = 64
 
-const ctx_ptr = &Context(unsafe { nil })
+__global ctx_ptr = &Context(unsafe { nil })
 
-const stdin_at_startup = u32(0)
+__global stdin_at_startup = u32(0)
 
 struct ExtraContext {
 mut:
@@ -21,14 +22,14 @@ mut:
 }
 
 fn restore_terminal_state() {
-	if unsafe { ui.ctx_ptr != 0 } {
+	if unsafe { ctx_ptr != 0 } {
-		if ui.ctx_ptr.cfg.use_alternate_buffer {
+		if ctx_ptr.cfg.use_alternate_buffer {
 			// clear the terminal and set the cursor to the origin
 			print('\x1b[2J\x1b[3J')
 			print('\x1b[?1049l')
 			flush_stdout()
 		}
-		C.SetConsoleMode(ui.ctx_ptr.stdin_handle, ui.stdin_at_startup)
+		C.SetConsoleMode(ctx_ptr.stdin_handle, stdin_at_startup)
 	}
 	load_title()
 	os.flush()
@@ -46,7 +47,7 @@ pub fn init(cfg Config) &Context {
 		panic('could not get stdin handle')
 	}
 	// save the current input mode, to be restored on exit
-	if !C.GetConsoleMode(stdin_handle, &ui.stdin_at_startup) {
+	if !C.GetConsoleMode(stdin_handle, &stdin_at_startup) {
 		panic('could not get stdin console mode')
 	}
 
@@ -80,14 +81,11 @@ pub fn init(cfg Config) &Context {
 		flush_stdout()
 	}
 
-	unsafe {
+	ctx_ptr = ctx
-		x := &ui.ctx_ptr
-		*x = ctx
-	}
 	C.atexit(restore_terminal_state)
 	for code in ctx.cfg.reset {
 		os.signal_opt(code, fn (_ os.Signal) {
-			mut c := unsafe { ui.ctx_ptr }
+			mut c := ctx_ptr
 			if unsafe { c != 0 } {
 				c.cleanup()
 			}

vlib/term/ui/termios_nix.c.v

@@ -36,7 +36,7 @@ fn restore_terminal_state_signal(_ os.Signal) {
 
 fn restore_terminal_state() {
 	termios_reset()
-	mut c := unsafe { ctx_ptr }
+	mut c := ctx_ptr
 	if unsafe { c != 0 } {
 		c.paused = true
 		load_title()
@@ -118,7 +118,7 @@ fn (mut ctx Context) termios_setup() ! {
 	C.atexit(restore_terminal_state)
 	os.signal_opt(.tstp, restore_terminal_state_signal) or {}
 	os.signal_opt(.cont, fn (_ os.Signal) {
-		mut c := unsafe { ctx_ptr }
+		mut c := ctx_ptr
 		if unsafe { c != 0 } {
 			c.termios_setup() or { panic(err) }
 			c.window_height, c.window_width = get_terminal_size()
@@ -133,7 +133,7 @@ fn (mut ctx Context) termios_setup() ! {
 	}) or {}
 	for code in ctx.cfg.reset {
 		os.signal_opt(code, fn (_ os.Signal) {
-			mut c := unsafe { ctx_ptr }
+			mut c := ctx_ptr
 			if unsafe { c != 0 } {
 				c.cleanup()
 			}
@@ -142,7 +142,7 @@ fn (mut ctx Context) termios_setup() ! {
 	}
 
 	os.signal_opt(.winch, fn (_ os.Signal) {
-		mut c := unsafe { ctx_ptr }
+		mut c := ctx_ptr
 		if unsafe { c != 0 } {
 			c.window_height, c.window_width = get_terminal_size()