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// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
//
// TODO Windows version needs 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
//
// read_line_utf8 blocks execution in a loop and awaits user input
// characters from a terminal until `EOF` or `Enter` key is encountered
// in the input stream.
// read_line_utf8 returns the complete input line as an UTF-8 encoded `[]rune` or
// an error if the line is empty.
// The `prompt` `string` is output as a prefix text for the input capturing.
// read_line_utf8 is the main method of the `readline` module and `Readline` struct.
pub fn (mut r Readline) read_line_utf8(prompt string) ?[]rune {
r.current = []rune{}
r.cursor = 0
r.prompt = prompt
r.search_index = 0
if r.previous_lines.len <= 1 {
r.previous_lines << []rune{}
r.previous_lines << []rune{}
} else {
r.previous_lines[0] = []rune{}
}
print(r.prompt)
r.current = os.get_raw_line().runes()
r.previous_lines[0] = []rune{}
r.search_index = 0
if r.current.len == 0 {
return error('empty line')
}
return r.current
}
// read_line does the same as `read_line_utf8` but returns user input as a `string`.
// (As opposed to `[]rune` returned by `read_line_utf8`).
pub fn (mut r Readline) read_line(prompt string) ?string {
s := r.read_line_utf8(prompt) ?
return s.string()
}
// read_line_utf8 blocks execution in a loop and awaits user input
// characters from a terminal until `EOF` or `Enter` key is encountered
// in the input stream.
// read_line_utf8 returns the complete input line as an UTF-8 encoded `[]rune` or
// an error if the line is empty.
// The `prompt` `string` is output as a prefix text for the input capturing.
// read_line_utf8 is the main method of the `readline` module and `Readline` struct.
// NOTE that this version of `read_line_utf8` is a standalone function without
// persistent functionalities (e.g. history).
pub fn read_line_utf8(prompt string) ?[]rune {
mut r := Readline{}
s := r.read_line_utf8(prompt) ?
return s
}
// read_line does the same as `read_line_utf8` but returns user input as a `string`.
// (As opposed to `[]rune` as returned by `read_line_utf8`).
// NOTE that this version of `read_line` is a standalone function without
// persistent functionalities (e.g. history).
pub fn read_line(prompt string) ?string {
mut r := Readline{}
s := r.read_line(prompt) ?
return s
}
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