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// Copyright 2014-2017 The Rprompt Developers // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. use std::io::Write; /// Reads user input, but without \n as `stdin::read_line` would pub fn read_reply() -> std::io::Result<String> { let mut reply = String::new(); std::io::stdin().read_line(&mut reply)?; // We should have a newline at the end. This helps prevent things such as: // > printf "no-newline" | program-using-rprompt // If we didn't have the \n check, we'd be removing the last "e" by mistake. if reply.chars().last() != Some('\n') { return Err(std::io::Error::new( std::io::ErrorKind::UnexpectedEof, "unexpected end of file", )); } // Remove the \n from the line. reply.pop().ok_or(std::io::Error::new( std::io::ErrorKind::UnexpectedEof, "unexpected end of file", ))?; Ok(reply) } /// Prompts for user input on STDOUT pub fn prompt_reply_stdout(prompt: &str) -> std::io::Result<String> { let mut stdout = std::io::stdout(); write!(stdout, "{}", prompt)?; stdout.flush()?; read_reply() } /// Prompts for user input on STDERR pub fn prompt_reply_stderr(prompt: &str) -> std::io::Result<String> { let mut stderr = std::io::stderr(); write!(stderr, "{}", prompt)?; stderr.flush()?; read_reply() }