add warnings for no isatty(), and bad terminfo.

README.md

@@ -337,6 +337,8 @@ The screen on which every other node renders.
   combining characters properly. Blessed simply removes them from an element's
   content if iTerm2 is detected).
 - __sendFocus__ - send focus events after mouse is enabled.
+- __warnings__ - display warnings (such as the output not being a TTY, similar
+  to ncurses).
 
 ##### Properties:
 

lib/program.js

@@ -249,6 +249,12 @@ Program.prototype.setupTput = function() {
     termcap: options.termcap
   });
 
+  if (tput.error) {
+    nextTick(function() {
+      self.emit('warning', tput.error.message);
+    });
+  }
+
   this.put = function() {
     var args = slice.call(arguments)
       , cap = args.shift();
@@ -368,6 +374,12 @@ Program.prototype.listen = function() {
   if (this.output._blessedListened) return;
   this.output._blessedListened = true;
 
+  if (!this.output.isTTY) {
+    nextTick(function() {
+      self.emit('warning', 'Output is not a TTY');
+    });
+  }
+
   // Output
   function resize() {
     self.cols = self.output.columns;

lib/tput.js

@@ -68,6 +68,7 @@ Tput.prototype.setup = function() {
         this.injectTermcap();
       } catch (e) {
         if (this.debug) throw e;
+        this.error = new Error('Termcap parse error.');
         this._useInternalCap(this.terminal);
       }
     } else {
@@ -75,6 +76,7 @@ Tput.prototype.setup = function() {
         this.injectTerminfo();
       } catch (e) {
         if (this.debug) throw e;
+        this.error = new Error('Terminfo parse error.');
         this._useInternalInfo(this.terminal);
       }
     }
@@ -82,6 +84,7 @@ Tput.prototype.setup = function() {
     // If there was an error, fallback
     // to an internally stored terminfo/cap.
     if (this.debug) throw e;
+    this.error = new Error('Terminfo not found.');
     this._useXtermInfo();
   }
 };

lib/widgets/screen.js

@@ -152,6 +152,10 @@ function Screen(options) {
     self.emit('blur');
   });
 
+  this.program.on('warning', function(text) {
+    self.emit('warning', text);
+  });
+
   this.on('newListener', function fn(type) {
     if (type === 'keypress' || type.indexOf('key ') === 0 || type === 'mouse') {
       if (type === 'keypress' || type.indexOf('key ') === 0) self._listenKeys();
@@ -347,6 +351,30 @@ Screen.prototype.postEnter = function() {
     this.debugLog.key(['q', 'escape'], self.debugLog.toggle);
     this.key('f12', self.debugLog.toggle);
   }
+
+  if (this.options.warnings) {
+    this.on('warning', function(text) {
+      var warning = new Box({
+        screen: self,
+        parent: self,
+        left: 'center',
+        top: 'center',
+        width: 30,
+        height: 'shrink',
+        align: 'center',
+        valign: 'middle',
+        border: 'line',
+        label: ' {red-fg}{bold}WARNING{/} ',
+        content: '{bold}' + text + '{/bold}',
+        tags: true
+      });
+      self.render();
+      setTimeout(function() {
+        warning.destroy();
+        self.render();
+      }, 1500).unref();
+    });
+  }
 };
 
 Screen.prototype.destroy = function() {