fix clr_eos/ed and other possible collisions.

lib/program.js

@@ -1053,7 +1053,9 @@ Program.prototype.eraseInDisplay = function(param) {
 };
 
 Program.prototype.clear = function() {
-  return this.eraseInDisplay('all');
+  if (this.tput) return this.tput.clear();
+  return this.write('\x1b[H\x1b[J');
+  // return this.ed('all');
 };
 
 // CSI Ps K  Erase in Line (EL).

lib/tput.js

@@ -1188,6 +1188,31 @@ delete Tput.alias.numbers;
 merge(Tput.alias, Tput.alias.strings);
 delete Tput.alias.strings;
 
+// Make sure there are no collisions between cap and tcap.
+Tput._vec = [];
+
+Object.keys(Tput.alias).forEach(function(key) {
+  if (!Array.isArray(Tput.alias[key])) {
+    return Tput._vec.push(Tput.alias[key]);
+  }
+  Tput._vec.push(Tput.alias[key][0]);
+});
+
+Object.keys(Tput.alias).forEach(function(key) {
+  if (!Array.isArray(Tput.alias[key])) {
+    return;
+  }
+
+  var alias = Tput.alias[key]
+    , tcap = alias[1];
+
+  if (!tcap) return;
+
+  if (~Tput._vec.indexOf(tcap)) {
+    alias.splice(1, 1);
+  }
+});
+
 /**
  * Terminfo Data
  */