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