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term.ui: approximate colors into ansi if rgb isn't supported (#6951)

pull/6954/head
spaceface777 2020-11-26 00:28:57 +01:00 committed by GitHub
parent 258f8f6af9
commit e03ae19372
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 215 additions and 34 deletions
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3
examples/term.ui/term_drawing.v
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@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module main
import term.ui as tui

88
vlib/term/ui/color.v 100644
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@ -0,0 +1,88 @@
// radare - LGPL - Copyright 2013-2020 - pancake, xarkes
// ansi 256 color extension for r_cons
// https://en.wikipedia.org/wiki/ANSI_color
module ui
const (
value_range = [0x00, 0x5f, 0x87, 0xaf, 0xd7, 0xff]!!
color_table = init_color_table()
)
[direct_array_access]
fn init_color_table() []int {
mut color_table := []int{len: 256}
// ansi colors
color_table[0] = 0x000000
color_table[1] = 0x800000
color_table[2] = 0x008000
color_table[3] = 0x808000
color_table[4] = 0x000080
color_table[5] = 0x800080
color_table[6] = 0x008080
color_table[7] = 0xc0c0c0
color_table[8] = 0x808080
color_table[9] = 0xff0000
color_table[10] = 0x00ff00
color_table[11] = 0xffff00
color_table[12] = 0x0000ff
color_table[13] = 0xff00ff
color_table[14] = 0x00ffff
color_table[15] = 0xffffff
// color palette
for i in 0 .. 216 {
r := value_range[(i / 36) % 6]
g := value_range[(i / 6) % 6]
b := value_range[i % 6]
color_table[i + 16] = ((r << 16) & 0xffffff) + ((g << 8) & 0xffff) + (b & 0xff)
}
// grayscale
for i in 0 .. 24 {
r := 8 + (i * 10)
color_table[i + 232] = ((r << 16) & 0xffffff) + ((r << 8) & 0xffff) + (r & 0xff)
}
return color_table
}
fn clamp(x int, y int, z int) int {
if x < y {
return y
}
if x > z {
return z
}
return x
}
fn approximate_rgb(r int, g int, b int) int {
grey := r > 0 && r < 255 && r == g && r == b
if grey {
return 232 + int(f64(r) / (255 / 24.1))
}
k := int(256.0 / 6)
r2 := clamp(r / k, 0, 5)
g2 := clamp(g / k, 0, 5)
b2 := clamp(b / k, 0, 5)
return 16 + (r2 * 36) + (g2 * 6) + b2
}
fn lookup_rgb(r int, g int, b int) int {
color := (r << 16) + (g << 8) + b
// lookup extended colors only, coz non-extended can be changed by users.
for i in 16 .. 256 {
if color_table[i] == color {
return i
}
}
return -1
}
// converts an RGB color to an ANSI 256-color, approximating it to the nearest available color
// if an exact match is not found
fn rgb2ansi(r int, g int, b int) int {
c := lookup_rgb(r, g, b)
if c == -1 {
return approximate_rgb(r, g, b)
}
return c
}

8
vlib/term/ui/input.v
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@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
pub enum KeyCode {
@ -164,11 +167,11 @@ pub struct Context {
pub:
cfg Config
mut:
termios C.termios
read_buf []byte
print_buf []byte
paused bool
enable_su bool
enable_rgb bool
pub mut:
frame_count u64
window_width int
@ -191,6 +194,7 @@ pub struct Config {
hide_cursor bool
capture_events bool
use_alternate_buffer bool = true
// All kill signals
skip_init_checks bool
// All kill signals to set up exit listeners on
reset []int = [1, 2, 3, 4, 6, 7, 8, 9, 11, 13, 14, 15, 19]
}

7
vlib/term/ui/input_nix.c.v
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@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
const (
@ -28,12 +31,12 @@ pub fn (mut ctx Context) load_title() {
print('\x1b[23;0t')
}
pub fn (mut ctx Context) run() {
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()
ctx.termios_setup()?
ctx.termios_loop()
}
}

3
vlib/term/ui/input_windows.c.v
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@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
const (

75
vlib/term/ui/termios_nix.c.v
View File

@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
import os
@ -51,10 +54,14 @@ fn restore_terminal_state() {
os.flush()
}
fn (mut ctx Context) termios_setup() {
fn (mut ctx Context) termios_setup() ? {
// store the current title, so restore_terminal_state can get it back
ctx.save_title()
if !ctx.cfg.skip_init_checks && !(is_atty(C.STDIN_FILENO) != 0 && is_atty(C.STDOUT_FILENO) != 0) {
return error('not running under a TTY')
}
mut termios := get_termios()
if ctx.cfg.capture_events {
@ -75,12 +82,16 @@ fn (mut ctx Context) termios_setup() {
print('\x1b]0;$ctx.cfg.window_title\x07')
}
if !ctx.cfg.skip_init_checks {
// prevent blocking during the feature detections, but allow enough time for the terminal
// to send back the relevant input data
termios.c_cc[C.VTIME] = 1
termios.c_cc[C.VMIN] = 0
C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH, &termios)
// feature-test the SU spec
sx, sy := get_cursor_position()
print('$bsu$esu')
ex, ey := get_cursor_position()
if sx == ex && sy == ey {
// the terminal either ignored or handled the sequence properly, enable SU
ctx.enable_su = true
@ -89,6 +100,10 @@ fn (mut ctx Context) termios_setup() {
ctx.set_cursor_position(sx, sy)
ctx.flush()
}
// feature-test rgb (truecolor) support
ctx.enable_rgb = supports_truecolor()
}
// Prevent stdin from blocking by making its read time 0
termios.c_cc[C.VTIME] = 0
termios.c_cc[C.VMIN] = 0
@ -101,7 +116,6 @@ fn (mut ctx Context) termios_setup() {
// clear the terminal and set the cursor to the origin
print('\x1b[2J\x1b[3J\x1b[1;1H')
}
ctx.termios = termios
ctx.window_height, ctx.window_width = get_terminal_size()
// Reset console on exit
@ -179,6 +193,61 @@ fn get_cursor_position() (int, int) {
return x, y
}
fn supports_truecolor() bool {
// set the bg color to some arbirtrary value (#010203), assumed not to be the default
print('\x1b[48:2:1:2:3m')
sx, sy := get_cursor_position()
// sequence to query the current cursor position
print('\x1bP\$qm\x1b\\')
color := get_current_bg_color()
ex, ey := get_cursor_position()
// if the terminal doesn't understand the "get current color",
// assume it doesn't support truecolor either
if !(sx == ex && sy == ey) {
println('>>> different pos: ($sx, $sy) -> ($ex, $ey)')
return false
}
// TODO: iTerm emits a different sequence, but it's compatible anyways, so
if color !in [0x010203, 0x01010203] {
println('>>> no match: $color')
return false
}
return true
}
fn get_current_bg_color() int {
mut res := 0
mut colon_cnt := 0
mut cur_val := 0
for i := 0; i < 50 ; i++ {
ch := int(C.getchar())
b := byte(ch)
if b in [0, 255] {
return -1
} else if b == `m` {
if colon_cnt > 1 {
res = (res << 8) | cur_val
cur_val = 0
}
break
} else if b in [`:`, `;`] {
if colon_cnt > 1 {
res = (res << 8) | cur_val
cur_val = 0
}
colon_cnt++
} else if b.is_digit() {
if colon_cnt > 1 {
cur_val = cur_val * 10 + b - byte(`0`)
}
}
}
return res
}
fn termios_reset() {
C.tcsetattr(C.STDIN_FILENO, C.TCSAFLUSH /* C.TCSANOW ?? */, &termios_at_startup)
print('\x1b[?1003l\x1b[?1006l\x1b[?25h')

11
vlib/term/ui/ui.v
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@ -1,3 +1,6 @@
// Copyright (c) 2020 Raúl Hernández. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module ui
import strings
@ -57,12 +60,20 @@ pub fn (mut ctx Context) set_cursor_position(x int, y int) {
[inline]
pub fn (mut ctx Context) set_color(c Color) {
if ctx.enable_rgb {
ctx.write('\x1b[38;2;${int(c.r)};${int(c.g)};${int(c.b)}m')
} else {
ctx.write('\x1b[38;5;${rgb2ansi(c.r, c.g, c.b)}m')
}
}
[inline]
pub fn (mut ctx Context) set_bg_color(c Color) {
if ctx.enable_rgb {
ctx.write('\x1b[48;2;${int(c.r)};${int(c.g)};${int(c.b)}m')
} else {
ctx.write('\x1b[48;5;${rgb2ansi(c.r, c.g, c.b)}m')
}
}
[inline]