From 9db97cd61c162347efada68d5755a13a1d75eba5 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Sun, 14 Jul 2013 08:37:57 -0500
Subject: [PATCH] easier feature checking.

---
 lib/program.js | 32 +++++++++++++++++++++-----------
 lib/tput.js    | 29 +++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+), 11 deletions(-)

diff --git a/lib/program.js b/lib/program.js
index b7a9d86..aa61aa9 100644
--- a/lib/program.js
+++ b/lib/program.js
@@ -118,6 +118,12 @@ Program.prototype.setupTput = function() {
   });
 };
 
+Program.prototype.has = function(name) {
+  return this.tput
+    ? this.tput.has(name)
+    : false;
+};
+
 Program.prototype.term = function(is) {
   return this.terminal.indexOf(is) === 0;
 };
@@ -953,13 +959,13 @@ Program.prototype.repeat = function(ch, i) {
 
 //Program.prototype.pad =
 Program.prototype.nul = function() {
-  //if (this.tput) return this.put.pad();
+  //if (this.has('pad')) return this.put.pad();
   return this.write('\0');
 };
 
 Program.prototype.bel =
 Program.prototype.bell = function() {
-  if (this.tput) return this.put.bel();
+  if (this.has('bel')) return this.put.bel();
   return this.write('\x07');
 };
 
@@ -971,7 +977,7 @@ Program.prototype.vtab = function() {
 
 Program.prototype.ff =
 Program.prototype.form = function() {
-  if (this.tput) return this.put.ff();
+  if (this.has('ff')) return this.put.ff();
   return this.write('\x0c');
 };
 
@@ -979,7 +985,7 @@ Program.prototype.kbs =
 Program.prototype.backspace = function() {
   this.x--;
   this._ncoords();
-  if (this.tput) return this.put.kbs();
+  if (this.has('kbs')) return this.put.kbs();
   return this.write('\x08');
 };
 
@@ -987,24 +993,24 @@ Program.prototype.ht =
 Program.prototype.tab = function() {
   this.x += 8;
   this._ncoords();
-  if (this.tput) return this.put.ht();
+  if (this.has('ht')) return this.put.ht();
   return this.write('\t');
 };
 
 Program.prototype.shiftOut = function() {
-  // if (this.tput) return this.put.S2();
+  // if (this.has('S2')) return this.put.S2();
   return this.write('\x0e');
 };
 
 Program.prototype.shiftIn = function() {
-  // if (this.tput) return this.put.S3();
+  // if (this.has('S3')) return this.put.S3();
   return this.write('\x0f');
 };
 
 Program.prototype.cr =
 Program.prototype.return = function() {
   this.x = 0;
-  if (this.tput) return this.put.cr();
+  if (this.has('cr')) return this.put.cr();
   return this.write('\r');
 };
 
@@ -1014,7 +1020,7 @@ Program.prototype.feed = function() {
   this.x = 0;
   this.y++;
   this._ncoords();
-  if (this.tput) return this.put.nel();
+  if (this.has('nel')) return this.put.nel();
   return this.write('\n');
 };
 
@@ -1050,14 +1056,18 @@ Program.prototype.nextLine = function() {
   this.y++;
   this.x = 0;
   this._ncoords();
-  if (this.tput) return this.put.nel();
+  if (this.has('nel')) return this.put.nel();
   return this.write('\x1bE');
 };
 
 // ESC c Full Reset (RIS).
 Program.prototype.reset = function() {
   this.x = this.y = 0;
-  if (this.tput) return this.put.rs1 ? this.put.rs1() : this.put.ris();
+  if (this.has('rs1') || this.has('ris')) {
+    return this.has('rs1')
+      ? this.put.rs1()
+      : this.put.ris();
+  }
   return this.write('\x1bc');
 };
 
diff --git a/lib/tput.js b/lib/tput.js
index bfe2640..2c3f16c 100644
--- a/lib/tput.js
+++ b/lib/tput.js
@@ -1581,6 +1581,35 @@ assert.equal(Tput.alias.exit_delete_mode.termcap, 'ed');
 // Tput.alias.lines.ignore = 0;
 // Tput.alias.set_lr_margin.ignore = 1;
 
+/**
+ * Feature Checking
+ */
+
+Tput.aliasMap = {};
+
+Object.keys(Tput.alias).forEach(function(key) {
+  var aliases = Array.isArray(Tput.alias[key])
+    ? Tput.alias[key]
+    : [Tput.alias[key]];
+  Tput.aliasMap[key] = key;
+  aliases.forEach(function(k) {
+    Tput.aliasMap[k] = key;
+  });
+});
+
+Tput.prototype.has = function(name) {
+  var name = Tput.aliasMap[name]
+    , val = this.all[name];
+
+  if (!name) return false;
+
+  if (typeof val === 'number') {
+    return val !== -1;
+  }
+
+  return !!val;
+};
+
 /**
  * Fallback Termcap Entry
  */