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readline: history feature
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parent
7dd754ae74
commit
216f343f09
@ -40,6 +40,8 @@ mut:
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overwrite bool
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cursor_row_offset int
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prompt string
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previous_lines []string
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search_index int
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}
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@ -112,6 +114,14 @@ pub fn (r mut Readline) read_line(prompt string) string {
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r.current = ''
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r.cursor = 0
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r.prompt = prompt
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r.search_index = 0
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if r.previous_lines.len <= 1 {
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r.previous_lines << ''
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r.previous_lines << ''
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}
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else {
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r.previous_lines[0] = ''
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}
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print(r.prompt)
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for {
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@ -121,6 +131,8 @@ pub fn (r mut Readline) read_line(prompt string) string {
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break
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}
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}
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r.previous_lines[0] = ''
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r.search_index = 0
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return r.current
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}
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@ -150,8 +162,8 @@ fn (r Readline) analyse_control() Action {
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switch sequence {
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case `C`: return Action.move_cursor_right
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case `D`: return Action.move_cursor_left
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case `E`: return Action.history_next
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case `F`: return Action.history_previous
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case `B`: return Action.history_next
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case `A`: return Action.history_previous
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case `1`: return r.analyse_extended_control()
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case `3`: return r.analyse_extended_control_no_eat()
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}
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@ -194,6 +206,8 @@ fn (r mut Readline) execute(a Action, c byte) bool {
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case Action.move_cursor_end: r.move_cursor_end()
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case Action.move_cursor_word_left: r.move_cursor_word_left()
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case Action.move_cursor_word_right: r.move_cursor_word_right()
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case Action.history_previous: r.history_previous()
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case Action.history_next: r.history_next()
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case Action.clear_screen: r.clear_screen()
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}
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return false
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@ -294,7 +308,9 @@ fn (r mut Readline) suppr_character() {
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// Add a line break then stops the main loop
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fn (r mut Readline) commit_line() bool {
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r.previous_lines.insert(1, r.current)
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r.current = r.current + '\n'
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println('')
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return true
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}
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@ -349,3 +365,26 @@ fn (r mut Readline) clear_screen() {
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term.erase_clear()
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r.refresh_line()
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}
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fn (r mut Readline) history_previous() {
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if r.search_index + 2 >= r.previous_lines.len {
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return
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}
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if r.search_index == 0 {
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r.previous_lines[0] = r.current
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}
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r.search_index++
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r.current = r.previous_lines[r.search_index]
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r.cursor = r.current.len
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r.refresh_line()
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}
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fn (r mut Readline) history_next() {
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if r.search_index <= 0 {
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return
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}
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r.search_index--
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r.current = r.previous_lines[r.search_index]
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r.cursor = r.current.len
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r.refresh_line()
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}
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