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v/vlib/term/term.v
2021-02-08 00:28:46 +01:00

130 lines
3.4 KiB
V

module term
import os
const (
default_columns_size = 80
default_rows_size = 25
)
// Coord - used by term.get_cursor_position and term.set_cursor_position
pub struct Coord {
pub mut:
x int
y int
}
// 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() { inverse(bg_white(bold(red(' $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 }
}
// colorize returns a colored string by running the specified `cfn` over
// the message `s`, only if colored output is supported by the terminal.
// Example: term.colorize(term.yellow, 'the message')
pub fn colorize(cfn fn (string) string, s string) string {
if can_show_color_on_stdout() {
return cfn(s)
}
return 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 string, divider string) string {
if text.len == 0 {
return h_divider(divider)
}
xcols, _ := get_terminal_size()
cols := imax(1, xcols)
tlimit := imax(1, 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 := imax(0, (cols - tlimit_alligned) / 2)
ln := if divider.len > 0 {
divider.repeat(1 + cols / divider.len)[0..cols]
} else {
' '.repeat(1 + cols)
}
if ln.len == 1 {
return ln + ' ' + text[0..tlimit] + ' ' + ln
}
return ln[0..tstart] + ' ' + text[0..tlimit] + ' ' + ln[tstart + tlimit + 2..cols]
}
fn imax(x int, y int) int {
return if x > y { x } else { y }
}
fn supports_escape_sequences(fd int) bool {
vcolors_override := os.getenv('VCOLORS')
if vcolors_override == 'always' {
return true
}
if vcolors_override == 'never' {
return false
}
if os.getenv('TERM') == 'dumb' {
return false
}
$if windows {
if os.getenv('ConEmuANSI') == 'ON' {
return true
}
// 4 is enable_virtual_terminal_processing
return (is_atty(fd) & 0x0004) > 0
} $else {
return is_atty(fd) > 0
}
}
// clear clears current terminal screen.
pub fn clear() {
$if !windows {
print('\x1b[2J')
print('\x1b[H')
}
}