Revert "Remove defunct commit helper utility."

This reverts commit 3a43238.

This included working changes to `cursor.js`.

commit.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+abend()
+{
+    local message=$1
+    echo "fatal: $message" 1>&2
+    exit 1
+}
+
+files=$(git ls-files -m | wc -l | tr -d ' ')
+
+[ "$files" -ne 1 ] && abend "only one modified file at a time please"
+
+file=$(git ls-files -m)
+node "$file" || abend "test is now failing"
+name=$(basename $file)
+
+case "$1" in
+    tidy)
+        git commit -a -m 'Tidy `'$file'`.'$'\n\nSee #351.'
+        ;;
+    assert)
+        git commit -a -m 'Use `assert` in `'$name'`.'$'\n\nSee #351.'
+        ;;
+    vivify)
+        git commit -a -m 'Use `vivify` in `'$name'`.'$'\n\nSee #352.'
+        ;;
+esac

cursor.js

@@ -46,9 +46,8 @@ Cursor.prototype.next = cadence(function (async) {
 // to user land
 Cursor.prototype.indexOf = function (key, index) {
     ok(arguments.length == 2, 'index requires two arguments')
-    ok(index === 0 || index === 1, 'unexpected index')
     var page = this._page
-    var index = this._sheaf.find(page, key, 0)
+    var index = this._sheaf.find(page, key, index)
     var unambiguous
     unambiguous = -1 < index // <- todo: ?
                || ~ index < this._page.items.length
@@ -104,7 +103,7 @@ Cursor.prototype._filename = function (page) {
 
 Cursor.prototype.insert = function (record, key, index) {
     ok(this.exclusive, 'cursor is not exclusive')
-    ok(index > 0 || this._page.address == 1 || this._page.ghosts === 1, 'insert at ghost')
+    ok(index > 0 || this._page.address == 1)
 
     this._sheaf.unbalanced(this._page)
 
@@ -113,13 +112,8 @@ Cursor.prototype.insert = function (record, key, index) {
     }
 
     var heft = this._appender.writeInsert(index, record).heft
-    var replace = 0
-    if (index === 0) {
-        this._page.ghosts--
-        replace = 1
-    }
 
-    this._page.splice(index, replace, {
+    this._page.splice(index, 0, {
         key: key,
         record: record,
         heft: heft

release.ft

@@ -14,7 +14,6 @@ The common utility functions are now exported globally. They may move into a uti
 
 ### Issue by Issue
 
- * Remove defunct commit helper utility. #501.
  * Upgrade Advance and Splice. #498.
  * Upgrade Cadence to 0.0.52. #497.
  * User record serializer in `writeInsert`. #495.

t/proof.js

@@ -177,14 +177,13 @@ function abstracted (dir) {
                 b = b.name.split('.').pop()
                 return +(a) - +(b)
             })
-            console.log(files.map(function (file) { return file.name }))
+//            console.log(files.map(function (file) { return file.name }))
             record = { log: [] }
             var entry = 0
             files.forEach(function (file) {
                 position = 0
-                console.log(file)
                 file.body.forEach(function (line, index) {
-                    console.log(line)
+//                    console.log(line)
                     var json = line.header
                     ok(++entry == json[0], 'entry record is wrong')
                     if (json[1]) {