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/*
* Jexer - Java Text User Interface
*
* The MIT License (MIT)
*
* Copyright (C) 2019 Kevin Lamonte
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* @author Kevin Lamonte [[email protected]]
* @version 1
*/
package jexer.backend;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.StringTokenizer;
/**
* TTYSessionInfo queries environment variables and the tty window size for
* the session information. The username is taken from user.name, language
* is taken from user.language, and text window size from 'stty size'.
*/
public class TTYSessionInfo implements SessionInfo {
// ------------------------------------------------------------------------
// Variables --------------------------------------------------------------
// ------------------------------------------------------------------------
/**
* User name.
*/
private String username = "";
/**
* Language.
*/
private String language = "";
/**
* Text window width. Default is 80x24 (same as VT100-ish terminals).
*/
private int windowWidth = 80;
/**
* Text window height. Default is 80x24 (same as VT100-ish terminals).
*/
private int windowHeight = 24;
/**
* Time at which the window size was refreshed.
*/
private long lastQueryWindowTime;
// ------------------------------------------------------------------------
// Constructors -----------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Public constructor.
*/
public TTYSessionInfo() {
// Populate lang and user from the environment
username = System.getProperty("user.name");
language = System.getProperty("user.language");
queryWindowSize();
}
// ------------------------------------------------------------------------
// SessionInfo ------------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Username getter.
*
* @return the username
*/
public String getUsername() {
return this.username;
}
/**
* Username setter.
*
* @param username the value
*/
public void setUsername(final String username) {
this.username = username;
}
/**
* Language getter.
*
* @return the language
*/
public String getLanguage() {
return this.language;
}
/**
* Language setter.
*
* @param language the value
*/
public void setLanguage(final String language) {
this.language = language;
}
/**
* Text window width getter.
*
* @return the window width
*/
public int getWindowWidth() {
if (System.getProperty("os.name").startsWith("Windows")) {
// Always use 80x25 for Windows (same as DOS)
return 80;
}
return windowWidth;
}
/**
* Text window height getter.
*
* @return the window height
*/
public int getWindowHeight() {
if (System.getProperty("os.name").startsWith("Windows")) {
// Always use 80x25 for Windows (same as DOS)
return 25;
}
return windowHeight;
}
/**
* Re-query the text window size.
*/
public void queryWindowSize() {
if (lastQueryWindowTime == 0) {
lastQueryWindowTime = System.currentTimeMillis();
} else {
long nowTime = System.currentTimeMillis();
if (nowTime - lastQueryWindowTime < 1000) {
// Don't re-spawn stty if it hasn't been a full second since
// the last time.
return;
}
}
if (System.getProperty("os.name").startsWith("Linux")
|| System.getProperty("os.name").startsWith("Mac OS X")
|| System.getProperty("os.name").startsWith("SunOS")
|| System.getProperty("os.name").startsWith("FreeBSD")
) {
// Use stty to get the window size
sttyWindowSize();
}
}
// ------------------------------------------------------------------------
// TTYSessionInfo ---------------------------------------------------------
// ------------------------------------------------------------------------
/**
* Call 'stty size' to obtain the tty window size. windowWidth and
* windowHeight are set automatically.
*/
private void sttyWindowSize() {
String [] cmd = {
"/bin/sh", "-c", "stty size < /dev/tty"
};
try {
Process process = Runtime.getRuntime().exec(cmd);
BufferedReader in = new BufferedReader(
new InputStreamReader(process.getInputStream(), "UTF-8"));
String line = in.readLine();
if ((line != null) && (line.length() > 0)) {
StringTokenizer tokenizer = new StringTokenizer(line);
int rc = Integer.parseInt(tokenizer.nextToken());
if (rc > 0) {
windowHeight = rc;
}
rc = Integer.parseInt(tokenizer.nextToken());
if (rc > 0) {
windowWidth = rc;
}
}
while (true) {
BufferedReader err = new BufferedReader(
new InputStreamReader(process.getErrorStream(),
"UTF-8"));
line = err.readLine();
if ((line != null) && (line.length() > 0)) {
System.err.println("Error output from stty: " + line);
}
try {
process.waitFor();
break;
} catch (InterruptedException e) {
// SQUASH
}
}
int rc = process.exitValue();
if (rc != 0) {
System.err.println("stty returned error code: " + rc);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
