start using zero-indexed instance of Program.

lib/program.js

@@ -35,7 +35,7 @@ function Program(options) {
   this.input = options.input || process.stdin;
   this.output = options.output || process.stdout;
 
-  this.zero = options.zero;
+  this.zero = options.zero !== false;
 
   this.x = 0;
   this.y = 0;

lib/widget.js

@@ -228,8 +228,11 @@ function Screen(options) {
   Node.call(this, options);
 
   this.program = options.program;
+  this.program.zero = true;
   this.tput = this.program.tput;
+
   this.dattr = ((0 << 18) | (0x1ff << 9)) | 0x1ff;
+
   this.position = {
     left: this.left = this.rleft = 0,
     right: this.right = this.rright = 0,
@@ -496,11 +499,11 @@ Screen.prototype.blankLine = function(ch, dirty) {
 };
 
 Screen.prototype.insertLine = function(n, y, top, bottom) {
-  this.program.csr(top + 1, bottom + 1);
-  this.program.cup(y + 1, 1);
+  this.program.csr(top, bottom);
+  this.program.cup(y, 0);
   this.program.il(1);
-  this.program.csr(1, this.height - 1 + 1);
-  this.program.cup(y + 1, 1);
+  this.program.csr(0, this.height - 1);
+  this.program.cup(y, 0);
 
   if (n < 1) n = 1;
 
@@ -516,11 +519,11 @@ Screen.prototype.insertLine = function(n, y, top, bottom) {
 };
 
 Screen.prototype.deleteLine = function(n, y, top, bottom) {
-  this.program.csr(top + 1, bottom + 1);
-  this.program.cup(y + 1, 1);
+  this.program.csr(top, bottom);
+  this.program.cup(y, 0);
   this.program.dl(1);
-  this.program.csr(1, this.height - 1 + 1);
-  this.program.cup(y + 1, 1);
+  this.program.csr(0, this.height - 1);
+  this.program.cup(y, 0);
 
   if (n < 1) n = 1;
 
@@ -2358,8 +2361,8 @@ function Textbox(options) {
   function updateCursor() {
     if (self.screen.focused !== self) return;
     self.screen.program.cup(
-      self.top + 1 + (self.border ? 1 : 0),
-      self.left + 1 + (self.border ? 1 : 0)
+      self.top + (self.border ? 1 : 0),
+      self.left + (self.border ? 1 : 0)
       + self.value.length);
   }
 }
@@ -2384,8 +2387,8 @@ Textbox.prototype.setInput = function(callback) {
   // Could possibly save and restore cursor.
 
   this.screen.program.cup(
-    this.top + 1 + (this.border ? 1 : 0),
-    this.left + 1 + (this.border ? 1 : 0)
+    this.top + (this.border ? 1 : 0),
+    this.left + (this.border ? 1 : 0)
     + this.value.length);
   this.screen.program.showCursor();
   this.screen.program.sgr('normal');
@@ -2520,6 +2523,10 @@ Textarea.prototype.updateCursor = function() {
     return;
   }
 
+  // To test blessed-maintained coords:
+  // this.cx = this.screen.program.x;
+  // this.cy = this.screen.program.y;
+
   var last = this._clines[this._clines.length-1]
     , program = this.screen.program
     , line
@@ -2537,8 +2544,8 @@ Textarea.prototype.updateCursor = function() {
     this._clines.length - 1 - this.childBase,
     this.height - (this.border ? 2 : 0) - 1);
 
-  cy = this.top + 1 + (this.border ? 1 : 0) + line;
-  cx = this.left + 1 + (this.border ? 1 : 0) + last.length;
+  cy = this.top + (this.border ? 1 : 0) + line;
+  cx = this.left + (this.border ? 1 : 0) + last.length;
 
   if (cy === this.cy && cx === this.cx) {
     return;
@@ -2552,18 +2559,17 @@ Textarea.prototype.updateCursor = function() {
     }
   } else if (cx === this.cx) {
     if (cy > this.cy) {
-      if (cy - this.cy === 1) {
-        program.ind();
-      } else {
+      // if (cy - this.cy === 1) {
+      //   program.ind();
+      // } else {
       program.cud(cy - this.cy);
-      }
     } else if (cy < this.cy) {
-      if (this.cy - cy === 1) {
-        program.ri();
-      } else {
+      // Technically works:
+      // if (this.cy - cy === 1) {
+      //   program.ri();
+      // } else {
       program.cuu(this.cy - cy);
     }
-    }
   } else {
     program.cup(cy, cx);
   }