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v/vlib/readline/readline.js.v

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2020-02-03 07:00:36 +03:00
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
// JS version
// Need to be implemented
// Will serve as more advanced input method
// Based on the work of https://github.com/AmokHuginnsson/replxx
module readline
import os
// Only use standard os.get_line
// Need implementation for readline capabilities
pub fn (r mut Readline) read_line_utf8(prompt string) ?ustring {
r.current = ''.ustring()
r.cursor = 0
r.prompt = prompt
r.search_index = 0
if r.previous_lines.len <= 1 {
r.previous_lines << ''.ustring()
r.previous_lines << ''.ustring()
}
else {
r.previous_lines[0] = ''.ustring()
}
print(r.prompt)
r.current = os.get_raw_line().ustring()
r.previous_lines[0] = ''.ustring()
r.search_index = 0
if r.current.s == '' {
return error('empty line')
}
return r.current
}
// Returns the string from the utf8 ustring
pub fn (r mut Readline) read_line(prompt string) ?string {
s := r.read_line_utf8(prompt) or {
return error(err)
}
return s.s
}
// Standalone function without persistent functionnalities (eg: history)
// Returns utf8 based ustring
pub fn read_line_utf8(prompt string) ?ustring {
mut r := Readline{}
s := r.read_line_utf8(prompt) or {
return error(err)
}
return s
}
// Standalone function without persistent functionnalities (eg: history)
// Return string from utf8 ustring
pub fn read_line(prompt string) ?string {
mut r := Readline{}
s := r.read_line(prompt) or {
return error(err)
}
return s
}