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term: implement term.clear() for windows (#8650)

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Swastik Baranwal 2021-02-09 17:55:31 +05:30 committed by GitHub
parent 5308b63a01
commit 6de78ecb59
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3 changed files with 65 additions and 8 deletions
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8
vlib/term/term.v
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@ -119,11 +119,3 @@ fn supports_escape_sequences(fd int) bool {
return is_atty(fd) > 0
}
}
// clear clears current terminal screen.
pub fn clear() {
$if !windows {
print('\x1b[2J')
print('\x1b[H')
}
}

6
vlib/term/term_nix.c.v
View File

@ -93,3 +93,9 @@ pub fn set_terminal_title(title string) bool {
print('\033]0;${title}\007')
return true
}
// clear clears current terminal screen.
pub fn clear() {
print('\x1b[2J')
print('\x1b[H')
}

59
vlib/term/term_windows.c.v
View File

@ -4,12 +4,14 @@ import os
[typedef]
struct C.COORD {
mut:
X i16
Y i16
}
[typedef]
struct C.SMALL_RECT {
mut:
Left u16
Top u16
Right u16
@ -20,6 +22,7 @@ struct C.SMALL_RECT {
// https://docs.microsoft.com/en-us/windows/console/console-screen-buffer-info-str
[typedef]
struct C.CONSOLE_SCREEN_BUFFER_INFO {
mut:
dwSize C.COORD
dwCursorPosition C.COORD
wAttributes u16
@ -27,12 +30,31 @@ struct C.CONSOLE_SCREEN_BUFFER_INFO {
dwMaximumWindowSize C.COORD
}
union C.uChar {
mut:
UnicodeChar rune
AsciiChar byte
}
[typedef]
struct C.CHAR_INFO {
mut:
Char C.uChar
Attributes u16
}
// ref - https://docs.microsoft.com/en-us/windows/console/getconsolescreenbufferinfo
fn C.GetConsoleScreenBufferInfo(handle os.HANDLE, info &C.CONSOLE_SCREEN_BUFFER_INFO) bool
// ref - https://docs.microsoft.com/en-us/windows/console/setconsoletitle
fn C.SetConsoleTitle(title &u16) bool
// ref - https://docs.microsoft.com/en-us/windows/console/setconsolecursorposition
fn C.SetConsoleCursorPosition(handle os.HANDLE, coord C.COORD) bool
// ref - https://docs.microsoft.com/en-us/windows/console/scrollconsolescreenbuffer
fn C.ScrollConsoleScreenBuffer(output os.HANDLE, scroll_rect &C.SMALL_RECT, clip_rect &C.SMALL_RECT, des C.COORD, fill C.CHAR_INFO) bool
// get_terminal_size returns a number of colums and rows of terminal window.
pub fn get_terminal_size() (int, int) {
if is_atty(1) > 0 && os.getenv('TERM') != 'dumb' {
@ -64,3 +86,40 @@ pub fn set_terminal_title(title string) bool {
title_change := C.SetConsoleTitle(title.to_wide())
return title_change
}
// clear clears current terminal screen.
// Implementation taken from https://docs.microsoft.com/en-us/windows/console/clearing-the-screen#example-2.
pub fn clear() {
hconsole := C.GetStdHandle(C.STD_OUTPUT_HANDLE)
mut csbi := C.CONSOLE_SCREEN_BUFFER_INFO{}
mut scrollrect := C.SMALL_RECT{}
mut scrolltarget := C.COORD{}
mut fill := C.CHAR_INFO{}
// Get the number of character cells in the current buffer.
if !C.GetConsoleScreenBufferInfo(hconsole, &csbi) {
return
}
// Scroll the rectangle of the entire buffer.
scrollrect.Left = 0
scrollrect.Top = 0
scrollrect.Right = u16(csbi.dwSize.X)
scrollrect.Bottom = u16(csbi.dwSize.Y)
// Scroll it upwards off the top of the buffer with a magnitude of the entire height.
scrolltarget.X = 0
scrolltarget.Y = (0 - csbi.dwSize.Y)
// Fill with empty spaces with the buffer's default text attribute.
fill.Char.UnicodeChar = rune(` `)
fill.Attributes = csbi.wAttributes
// Do the scroll
C.ScrollConsoleScreenBuffer(hconsole, &scrollrect, C.NULL, scrolltarget, &fill)
// Move the cursor to the top left corner too.
csbi.dwCursorPosition.X = 0
csbi.dwCursorPosition.Y = 0
C.SetConsoleCursorPosition(hconsole, csbi.dwCursorPosition)
}