v/vlib/term/term.v

86 lines
2.7 KiB
V

module term
import os
const (
default_columns_size = 80
default_rows_size = 25
)
// can_show_color_on_stdout returns true if colors are allowed in stdout;
// returns false otherwise.
pub fn can_show_color_on_stdout() bool {
return supports_escape_sequences(1)
}
// can_show_color_on_stderr returns true if colors are allowed in stderr;
// returns false otherwise.
pub fn can_show_color_on_stderr() bool {
return supports_escape_sequences(2)
}
// ok_message returns a colored string with green color.
// If colors are not allowed, returns a given string.
pub fn ok_message(s string) string {
return if can_show_color_on_stdout() { green(s) } else { s }
}
// fail_message returns a colored string with red color.
// If colors are not allowed, returns a given string.
pub fn fail_message(s string) string {
return if can_show_color_on_stdout() { bold(bg_red(white(s))) } else { s }
}
// warn_message returns a colored string with yellow color.
// If colors are not allowed, returns a given string.
pub fn warn_message(s string) string {
return if can_show_color_on_stdout() { bright_yellow(s) } else { s }
}
// h_divider returns a horizontal divider line with a dynamic width,
// that depends on the current terminal settings.
// If an empty string is passed in, print enough spaces to make a new line
pub fn h_divider(divider string) string {
cols,_ := get_terminal_size()
result := if divider.len > 0 { divider.repeat(1 + (cols / divider.len)) } else { " ".repeat(1 + cols) }
return result[0..cols]
}
// header returns a horizontal divider line with a centered text in the middle.
// e.g: term.header('TEXT', '=')
// =============== TEXT ===============
pub fn header(text, divider string) string {
if text.len == 0 || divider.len < 2 {
return h_divider(divider)
}
cols,_ := get_terminal_size()
tlimit := if cols > text.len + 2 + 2 * divider.len { text.len } else { cols - 3 - 2 * divider.len }
tlimit_alligned := if (tlimit % 2) != (cols % 2) { tlimit + 1 } else { tlimit }
tstart := (cols - tlimit_alligned) / 2
ln := if divider.len > 0 { divider.repeat(1 + cols / divider.len)[0..cols] } else { " ".repeat(1 + cols) }
return ln[0..tstart] + ' ' + text[0..tlimit] + ' ' + ln[tstart + tlimit + 2..cols]
}
fn supports_escape_sequences(fd int) bool {
//println('TERM=' + os.getenv('TERM'))
if os.getenv('TERM') == 'dumb' {
return false
}
vcolors_override := os.getenv('VCOLORS')
if vcolors_override == 'always' {
return true
}
$if windows {
return (is_atty(fd) & 0x0004) > 0 && os.getenv('TERM') != 'dumb' // enable_virtual_terminal_processing
} $else {
return is_atty(fd) > 0 && os.getenv('TERM') != 'dumb'
}
}
// clear clears current terminal screen.
pub fn clear() {
$if !windows {
C.printf('\x1b[2J')
C.printf('\x1b[H')
}
}