2 * Jexer - Java Text User Interface
4 * License: LGPLv3 or later
6 * This module is licensed under the GNU Lesser General Public License
7 * Version 3. Please see the file "COPYING" in this directory for more
8 * information about the GNU Lesser General Public License Version 3.
10 * Copyright (C) 2015 Kevin Lamonte
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Lesser General Public License
14 * as published by the Free Software Foundation; either version 3 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
22 * You should have received a copy of the GNU Lesser General Public
23 * License along with this program; if not, see
24 * http://www.gnu.org/licenses/, or write to the Free Software
25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
28 * @author Kevin Lamonte [kevin.lamonte@gmail.com]
31 package jexer
.session
;
33 import java
.io
.BufferedReader
;
34 import java
.io
.InputStreamReader
;
35 import java
.io
.IOException
;
36 import java
.util
.Date
;
37 import java
.util
.StringTokenizer
;
40 * TTYSessionInfo queries environment variables and the tty window size for
41 * the session information. The username is taken from user.name, language
42 * is taken from user.language, and text window size from 'stty size'.
44 public final class TTYSessionInfo
implements SessionInfo
{
49 private String username
= "";
54 private String language
= "";
57 * Text window width. Default is 80x24 (same as VT100-ish terminals).
59 private int windowWidth
= 80;
62 * Text window height. Default is 80x24 (same as VT100-ish terminals).
64 private int windowHeight
= 24;
67 * Time at which the window size was refreshed.
69 private Date lastQueryWindowTime
;
74 * @return the username
76 public String
getUsername() {
83 * @param username the value
85 public void setUsername(final String username
) {
86 this.username
= username
;
92 * @return the language
94 public String
getLanguage() {
101 * @param language the value
103 public void setLanguage(final String language
) {
104 this.language
= language
;
108 * Call 'stty size' to obtain the tty window size. windowWidth and
109 * windowHeight are set automatically.
111 private void sttyWindowSize() {
113 "/bin/sh", "-c", "stty size < /dev/tty"
116 Process process
= Runtime
.getRuntime().exec(cmd
);
117 BufferedReader in
= new BufferedReader(
118 new InputStreamReader(process
.getInputStream(), "UTF-8"));
119 String line
= in
.readLine();
120 if ((line
!= null) && (line
.length() > 0)) {
121 StringTokenizer tokenizer
= new StringTokenizer(line
);
122 int rc
= Integer
.parseInt(tokenizer
.nextToken());
126 rc
= Integer
.parseInt(tokenizer
.nextToken());
132 BufferedReader err
= new BufferedReader(
133 new InputStreamReader(process
.getErrorStream(),
135 line
= err
.readLine();
136 if ((line
!= null) && (line
.length() > 0)) {
137 System
.err
.println("Error output from stty: " + line
);
142 } catch (InterruptedException e
) {
146 int rc
= process
.exitValue();
148 System
.err
.println("stty returned error code: " + rc
);
150 } catch (IOException e
) {
156 * Text window width getter.
158 * @return the window width
160 public int getWindowWidth() {
161 if (System
.getProperty("os.name").startsWith("Windows")) {
162 // Always use 80x25 for Windows (same as DOS)
169 * Text window height getter.
171 * @return the window height
173 public int getWindowHeight() {
174 if (System
.getProperty("os.name").startsWith("Windows")) {
175 // Always use 80x25 for Windows (same as DOS)
182 * Re-query the text window size.
184 public void queryWindowSize() {
185 if (lastQueryWindowTime
== null) {
186 lastQueryWindowTime
= new Date();
188 Date now
= new Date();
189 if (now
.getTime() - lastQueryWindowTime
.getTime() < 3000) {
190 // Don't re-spawn stty, it's been too soon.
194 if (System
.getProperty("os.name").startsWith("Linux")
195 || System
.getProperty("os.name").startsWith("Mac OS X")
196 || System
.getProperty("os.name").startsWith("SunOS")
197 || System
.getProperty("os.name").startsWith("FreeBSD")
199 // Use stty to get the window size
205 * Public constructor.
207 public TTYSessionInfo() {
208 // Populate lang and user from the environment
209 username
= System
.getProperty("user.name");
210 language
= System
.getProperty("user.language");