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#
#
# Nim's Runtime Library
# (c) Copyright 2015 Andreas Rumpf
#
# See the file "copying.txt", included in this
# distribution, for details about the copyright.
#
## This module contains code for reading from `stdin`:idx:. On UNIX the
## linenoise library is wrapped and set up to provide default key bindings
## (e.g. you can navigate with the arrow keys). On Windows ``system.readLine``
## is used. This suffices because Windows' console already provides the
## wanted functionality.
{.deadCodeElim: on.} # dce option deprecated
when defined(Windows):
proc readLineFromStdin*(prompt: string): TaintedString {.
tags: [ReadIOEffect, WriteIOEffect].} =
## Reads a line from stdin.
stdout.write(prompt)
result = readLine(stdin)
proc readLineFromStdin*(prompt: string, line: var TaintedString): bool {.
tags: [ReadIOEffect, WriteIOEffect].} =
## Reads a `line` from stdin. `line` must not be
## ``nil``! May throw an IO exception.
## A line of text may be delimited by ``CR``, ``LF`` or
## ``CRLF``. The newline character(s) are not part of the returned string.
## Returns ``false`` if the end of the file has been reached, ``true``
## otherwise. If ``false`` is returned `line` contains no new data.
stdout.write(prompt)
result = readLine(stdin, line)
elif defined(genode):
proc readLineFromStdin*(prompt: string): TaintedString {.
tags: [ReadIOEffect, WriteIOEffect].} =
stdin.readLine()
proc readLineFromStdin*(prompt: string, line: var TaintedString): bool {.
tags: [ReadIOEffect, WriteIOEffect].} =
stdin.readLine(line)
else:
import linenoise, termios
proc readLineFromStdin*(prompt: string): TaintedString {.
tags: [ReadIOEffect, WriteIOEffect].} =
var buffer = linenoise.readLine(prompt)
if isNil(buffer):
raise newException(IOError, "Linenoise returned nil")
result = TaintedString($buffer)
if result.string.len > 0:
historyAdd(buffer)
linenoise.free(buffer)
proc readLineFromStdin*(prompt: string, line: var TaintedString): bool {.
tags: [ReadIOEffect, WriteIOEffect].} =
var buffer = linenoise.readLine(prompt)
if isNil(buffer):
line.string.setLen(0)
return false
line = TaintedString($buffer)
if line.string.len > 0:
historyAdd(buffer)
linenoise.free(buffer)
result = true
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