--- /dev/null
+/*
+ * 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 [kevin.lamonte@gmail.com]
+ * @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();
+ }
+ }
+
+}
git://git.nikiroo.be / fanfix.git / blobdiff