Initial project import

tools/v/vlib/term/ui/input_nix.c.v

@@ -0,0 +1,85 @@
+// Copyright (c) 2020-2024 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 {
+mut:
+	read_buf []u8
+	// read_all_bytes causes all the raw bytes to be read as one event unit.
+	// This is cruicial for UTF-8 support since Unicode codepoints can span several bytes.
+	read_all_bytes bool = true
+}
+
+__global ctx_ptr = &Context(unsafe { nil })
+
+// init initializes the terminal console with Config `cfg`.
+pub fn init(cfg Config) &Context {
+	caps := current_terminal_capabilities()
+	mut ctx := &Context{
+		cfg:                       cfg
+		enable_ansi256:            caps.enable_ansi256
+		supports_alternate_buffer: caps.supports_alternate_buffer
+		supports_sgr_mouse:        caps.supports_sgr_mouse
+		supports_sync_updates:     caps.supports_sync_updates
+		supports_window_title:     caps.supports_window_title
+	}
+	ctx.read_buf = []u8{cap: cfg.buffer_size}
+
+	ctx_ptr = ctx
+	return ctx
+}
+
+@[inline]
+fn save_title() {
+	mut ctx := ctx_ptr
+	if unsafe { ctx == 0 } || !ctx.supports_window_title {
+		return
+	}
+	// restore the previously saved terminal title
+	print('\x1b[22;0t')
+	flush_stdout()
+}
+
+@[inline]
+fn load_title() {
+	mut ctx := ctx_ptr
+	if unsafe { ctx == 0 } || !ctx.supports_window_title {
+		return
+	}
+	// restore the previously saved terminal title
+	print('\x1b[23;0t')
+	flush_stdout()
+}
+
+// run sets up and starts the terminal.
+pub fn (mut ctx Context) run() ! {
+	if ctx.cfg.use_x11 {
+		ctx.fail('error: x11 backend not implemented yet')
+		exit(1)
+	} else {
+		ctx.termios_setup() or { panic(err) }
+		ctx.termios_loop()
+	}
+}
+
+// shifts the array left, to remove any data that was just read, and updates its len
+// TODO: remove
+@[inline]
+fn (mut ctx Context) shift(len int) {
+	unsafe {
+		C.memmove(ctx.read_buf.data, &u8(ctx.read_buf.data) + len, ctx.read_buf.cap - len)
+		ctx.resize_arr(ctx.read_buf.len - len)
+	}
+}
+
+// TODO: don't actually do this, lmao
+@[inline]
+fn (mut ctx Context) resize_arr(size int) {
+	mut l := unsafe { &ctx.read_buf.len }
+	unsafe {
+		*l = size
+		_ = l
+	}
+}