82 lines
2.0 KiB
Go
82 lines
2.0 KiB
Go
// License: GPLv3 Copyright: 2022, Kovid Goyal, <kovid at kovidgoyal.net>
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package readline
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import (
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"fmt"
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"kitty/tools/wcswidth"
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)
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var _ = fmt.Print
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func (self *Readline) write_line_with_prompt(line, prompt string, screen_width int) int {
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self.loop.QueueWriteString(prompt)
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self.loop.QueueWriteString(line)
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w := wcswidth.Stringwidth(prompt) + wcswidth.Stringwidth(line)
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num_lines := w / screen_width
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if w%screen_width == 0 {
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num_lines--
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}
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return num_lines
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}
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func (self *Readline) move_cursor_to_text_position(pos, screen_width int) int {
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num_of_lines := pos / screen_width
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self.loop.MoveCursorVertically(num_of_lines)
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self.loop.QueueWriteString("\r")
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x := pos % screen_width
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self.loop.MoveCursorHorizontally(x)
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return num_of_lines
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}
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func (self *Readline) update_current_screen_size() {
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screen_size, err := self.loop.ScreenSize()
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if err != nil {
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screen_size.WidthCells = 80
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screen_size.HeightCells = 24
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}
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if screen_size.WidthCells < 1 {
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screen_size.WidthCells = 1
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}
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if screen_size.HeightCells < 1 {
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screen_size.HeightCells = 1
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}
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self.screen_width = int(screen_size.WidthCells)
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}
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func (self *Readline) redraw() {
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if self.screen_width == 0 {
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self.update_current_screen_size()
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}
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if self.screen_width < 4 {
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return
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}
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if self.cursor_y > 0 {
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self.loop.MoveCursorVertically(-self.cursor_y)
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}
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self.loop.QueueWriteString("\r")
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self.loop.ClearToEndOfScreen()
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line_with_cursor := 0
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y := 0
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for i, line := range self.lines {
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p := self.prompt
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if i > 0 {
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y += 1
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self.loop.QueueWriteString("\r\n")
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p = self.continuation_prompt
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}
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if i == self.cursor.Y {
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line_with_cursor = y
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}
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y += self.write_line_with_prompt(line, p, self.screen_width)
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}
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self.loop.MoveCursorVertically(-y + line_with_cursor)
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line := self.lines[self.cursor.Y]
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plen := self.prompt_len
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if self.cursor.Y > 0 {
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plen = self.continuation_prompt_len
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}
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line_with_cursor += self.move_cursor_to_text_position(plen+wcswidth.Stringwidth(line[:self.cursor.X]), self.screen_width)
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self.cursor_y = line_with_cursor
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}
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