maintain gcode header/footer padding with substitutions

src/kiri/print.js

@@ -980,7 +980,7 @@
         }
     }
 
-    function constReplace(str, consts, start) {
+    function constReplace(str, consts, start, pad) {
         let cs = str.indexOf("{", start || 0),
             ce = str.indexOf("}", cs),
             tok, nutok, nustr;
@@ -992,6 +992,9 @@
                 constOp(tok, consts, "/", function(v1,v2) { return v1/v2 }) ||
                 constOp(tok, consts, "*", function(v1,v2) { return v1*v2 }) ||
                 consts[tok] || 0;
+            if (pad) {
+                nutok = nutok.toString().padEnd(ce-cs+1, ' ');
+            }
             nustr = str.replace("{"+tok+"}",nutok);
             return constReplace(nustr, consts, ce+1+(nustr.length-str.length));
         } else {

src/mode/fdm/export.js

@@ -116,8 +116,12 @@
             }
         };
 
-        function appendSub(line) {
-            append(print.constReplace(line, subst));
+        function appendSubPad(line, pad) {
+            appendSub(line, true);
+        }
+
+        function appendSub(line, pad) {
+            append(print.constReplace(line, subst, 0, pad));
         }
 
         function appendAll(arr) {
@@ -126,10 +130,10 @@
             arr.forEach(function(line) { append(line) });
         }
 
-        function appendAllSub(arr) {
+        function appendAllSub(arr, pad) {
             if (!arr) return;
             if (!Array.isArray(arr)) arr = [ arr ];
-            arr.forEach(function(line) { appendSub(line) });
+            arr.forEach(function(line) { appendSub(line, pad) });
         }
 
         append(`; Generated by Kiri:Moto ${KIRI.version}`);
@@ -174,11 +178,11 @@
             if (line.indexOf("{tool}") > 0 && extruders.length > 1) {
                 for (let i=0; i<extruders.length; i++) {
                     subst.tool = i;
-                    appendSub(line);
+                    appendSubPad(line);
                 }
                 subst.tool = 0;
             } else {
-                appendSub(line);
+                appendSubPad(line);
             }
         }
 
@@ -275,8 +279,8 @@
                 path.layer === 0 ?
                     (process.firstSliceHeight || process.sliceHeight) : path.height);
 
-            subst.z = zpos = path.z;
-            subst.Z = subst.z;
+            zpos = path.z;
+            subst.z = subst.Z = zpos.round(3);
             subst.e = subst.E = outputLength;
             subst.layer = layer;
             subst.height = path.height.toFixed(3);

web/kiri/index.css

@@ -873,8 +873,8 @@ th, tr, td, label {
     min-height: 4em !important;
 }
 #code-preview-textarea {
-    width: 100%;
-    height: 250px;
+    width: 40em;
+    height: 12em;
     font-size: 10px;
 }
 .mod-end {