unicode detect. docs. device attr. focus/blur. smacs checks.

README.md

@@ -194,6 +194,9 @@ The screen on which every other node renders.
 - **keypress** - received on key events.
 - **element [name]** - global events received for all elements.
 - **key [name]** - received on key event for [name].
+- **focus, blur** - when the terminal window focuses/blurs. requires a terminal
+  supporting the focus protocol and focus needs to be passed to
+  program.enableMouse().
 
 ##### Methods:
 

lib/program.js

@@ -50,6 +50,8 @@ function Program(options) {
 
   this.terminal = options.terminal || process.env.TERM || 'xterm';
 
+  this.unicode = this.detectUnicode();
+
   // if (!Program.global) {
   //   Program._write = process.stdout.write;
   //   process.stdout.write = function() {};
@@ -499,6 +501,110 @@ Program.prototype._bindResponse = function(s) {
     }
   }
 
+  // CSI P s c
+  // Send Device Attributes (Primary DA).
+  // CSI > P s c
+  // Send Device Attributes (Secondary DA).
+  if (parts = /^\x1b\[(\?|>)(\d*(?:;\d*)*)c/.exec(s)) {
+    var primary = parts[1] === '?'
+      , parts = parts[2].split(';').map(function(ch) { return +ch || 0; })
+      , out = {};
+
+    if (primary) {
+      out.type = 'primary-attribute';
+      // VT100-style params:
+      if (parts[0] === 1 && parts[2] === 2) {
+        out.term = 'vt100';
+        out.advancedVideo = true;
+      } else if (parts[0] === 1 && parts[2] === 0) {
+        out.term = 'vt101';
+      } else if (parts[0] === 6) {
+        out.term = 'vt102';
+      } else if (parts[0] === 60
+        && parts[1] === 1 && parts[2] === 2
+        && parts[3] === 6 && parts[4] === 8
+        && parts[5] === 9 && parts[6] === 15) {
+        out.term = 'vt220';
+      } else {
+        // VT200-style params:
+        parts.forEach(function(attr) {
+          switch (attr) {
+            case 1:
+              out.132cols = true;
+              break;
+            case 2:
+              out.printer = true;
+              break;
+            case 6:
+              out.selectiveErase = true;
+              break;
+            case 8:
+              out.userDefinedKeys = true;
+              break;
+            case 9:
+              out.nationalReplacementCharsets = true;
+              break;
+            case 15:
+              out.technicalCharacters = true;
+              break;
+            case 18:
+              out.userWindows = true;
+              break;
+            case 21:
+              out.horizontalScrolling = true;
+              break;
+            case 22:
+              out.ansiColor = true;
+              break;
+            case 29:
+              out.ansiTextLocator = true;
+              break;
+          }
+        });
+      }
+    } else {
+      out.type = 'secondary-attribute';
+      switch (parts[0]) {
+        case 0:
+          out.term = 'vt100';
+          break;
+        case 1:
+          out.term = 'vt220';
+          break;
+        case 2:
+          out.term = 'vt240';
+          break;
+        case 18:
+          out.term = 'vt330';
+          break;
+        case 19:
+          out.term = 'vt340';
+          break;
+        case 24:
+          out.term = 'vt320';
+          break;
+        case 41:
+          out.term = 'vt420';
+          break;
+        case 61:
+          out.term = 'vt510';
+          break;
+        case 64:
+          out.term = 'vt520';
+          break;
+        case 65:
+          out.term = 'vt525';
+          break;
+      }
+      out.firmwareVersion = parts[1];
+      out.romCartridgeRegistrationNumber = parts[2];
+    }
+
+    return this.emit('response', {
+      deviceAttributes: out
+    });
+  }
+
   // CSI Ps n  Device Status Report (DSR).
   //     Ps = 5  -> Status Report.  Result (``OK'') is
   //   CSI 0 n
@@ -673,6 +779,42 @@ Program.prototype._bindResponse = function(s) {
   }
 };
 
+// Not as foolproof as I'd like it to be.
+Program.prototype.detectUnicode = function() {
+  var LANG = process.env.LANG
+    + ':' + process.env.LANGUAGE
+    + ':' + process.env.LC_ALL
+    + ':' + process.env.LC_CTYPE;
+
+  return /utf-?8/i.test(LANG);
+};
+
+// Could do something goofy like this:
+Program.prototype.detectUnicode_ = function(callback) {
+  var out = String.fromCharCode((0x1b << 8) | '['.charCodeAt(0)) + 'c'
+    , done;
+
+  this.once('response', function(data) {
+    if (done) return;
+    done = true;
+    if (data.deviceAttributes) {
+      return callback(null, false);
+    }
+  });
+
+  this.write(out);
+
+  this.cub(2);
+  this.write('  ');
+  this.cub(2);
+
+  setTimeout(function() {
+    if (done) return;
+    done = true;
+    return callback(null, true);
+  }, 100);
+};
+
 Program.prototype.receive = function(text, callback) {
   var listeners = (this._events && this._events['keypress']) || []
     , bak = listeners.slice()

lib/widget.js

@@ -306,6 +306,14 @@ function Screen(options) {
     self._resizeTimer = setTimeout(resize, time);
   });
 
+  this.program.on('focus', function() {
+    self.emit('focus');
+  });
+
+  this.program.on('blur', function() {
+    self.emit('blur');
+  });
+
   this.program.alternateBuffer();
   this.program.hideCursor();
 
@@ -758,8 +766,13 @@ Screen.prototype.draw = function(start, end) {
         }
       }
 
-      // TODO: Figure out a way to detect utf8 terminals.
+      if (!this.program.unicode && this.tput
-      if (this.tput && this.tput.strings.enter_alt_charset_mode && SCLD[ch]) {
+          && this.tput.strings.enter_alt_charset_mode && SCLD[ch]
+          && this.tput.strings.enter_alt_charset_mode !== '\x1b[11m') {
+        // TODO: Possibly do not check for unicode above.
+        // For some reason TERM=linux has smacs/rmacs, but it maps to `^[[11m`
+        // and it does not switch to the DEC SCLD character set. What the hell?
+        // xterm: \x1b(0, screen: \x0e
         ch = this.tput.smacs() + SCLD[ch] + this.tput.rmacs();
       }