module term import os import strings.textscanner 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) } // failed returns a bold white on red version of the string `s` // If colors are not allowed, returns the string `s` pub fn failed(s string) string { if can_show_color_on_stdout() { return bg_red(bold(white(s))) } return s } // 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 { if can_show_color_on_stdout() { return green(' $s ') } return 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 failed(' $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 { if can_show_color_on_stdout() { return bright_yellow(' $s ') } return 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 } // strip_ansi removes any ANSI sequences in the `text` pub fn strip_ansi(text string) string { // This is a port of https://github.com/kilobyte/colorized-logs/blob/master/ansi2txt.c // \e, [, 1, m, a, b, c, \e, [, 2, 2, m => abc mut input := textscanner.new(text) mut output := []byte{cap: text.len} mut ch := 0 for ch != -1 { ch = input.next() if ch == 27 { ch = input.next() if ch == `[` { for { ch = input.next() if ch in [`;`, `?`] || (ch >= `0` && ch <= `9`) { continue } break } } else if ch == `]` { ch = input.next() if ch >= `0` && ch <= `9` { for { ch = input.next() if ch == -1 || ch == 7 { break } if ch == 27 { ch = input.next() break } } } } else if ch == `%` { ch = input.next() } } else if ch != -1 { output << byte(ch) } } return output.bytestr() } // 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() mut result := '' if divider.len > 0 { result = divider.repeat(1 + (cols / divider.len)) } else { result = ' '.repeat(1 + cols) } return result[0..cols] } // header_left returns a horizontal divider line with a title text on the left. // e.g: term.header_left('TITLE', '=') // ==== TITLE ========================= pub fn header_left(text string, divider string) string { plain_text := strip_ansi(text) xcols, _ := get_terminal_size() cols := imax(1, xcols) relement := if divider.len > 0 { divider } else { ' ' } hstart := relement.repeat(4)[0..4] remaining_cols := (cols - (hstart.len + 1 + plain_text.len + 1)) hend := relement.repeat((remaining_cols + 1) / relement.len)[0..remaining_cols] return '$hstart $text $hend' } // 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) mut ln := '' if divider.len > 0 { ln = divider.repeat(1 + cols / divider.len)[0..cols] } else { ln = ' '.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 } env_term := os.getenv('TERM') if env_term == 'dumb' { return false } $if windows { env_conemu := os.getenv('ConEmuANSI') if env_conemu == 'ON' { return true } // 4 is enable_virtual_terminal_processing return (os.is_atty(fd) & 0x0004) > 0 } $else { return os.is_atty(fd) > 0 } }