Fix #1302 Clear out the json cache on unbuild

lib/unbuild.js

@@ -23,6 +23,7 @@ function unbuild_ (folder, cb) {
   readJson(path.resolve(folder, "package.json"), function (er, pkg) {
     // if no json, then just trash it, but no scripts or whatever.
     if (er) return rm(folder, cb)
+    readJson.clearCache(folder)
     chain
       ( [ [lifecycle, pkg, "preuninstall", folder]
         , [lifecycle, pkg, "uninstall", folder]

lib/utils/read-json.js

@@ -3,6 +3,7 @@ module.exports = readJson
 readJson.processJson = processJson
 readJson.unParsePeople = unParsePeople
 readJson.parsePeople = parsePeople
+readJson.clearCache = clearCache
 
 var fs = require("graceful-fs")
   , semver = require("semver")
@@ -110,6 +111,7 @@ function processJson (opts, cb) {
     }
   }
 }
+
 function processJsonString (opts, cb) { return function (er, jsonString) {
   jsonString += ""
   if (er) return cb(er, jsonString)
@@ -132,6 +134,7 @@ function processJsonString (opts, cb) { return function (er, jsonString) {
   return processObject(opts, cb)(er, json)
 }}
 
+
 function jsonParseFail (ex, file, cb) {
   var e = new Error(
     "Failed to parse json\n"+ex.message)
@@ -309,6 +312,7 @@ function processObject (opts, cb) { return function (er, json) {
   if (cb) cb(null,json)
   return json
 }}
+
 function depObjectify (deps) {
   if (!Array.isArray(deps)) return deps
   var o = {}
@@ -318,6 +322,7 @@ function depObjectify (deps) {
   })
   return o
 }
+
 function testEngine (json) {
   // if engines is empty, then assume that node is allowed.
   log.silly(json, "testEngine")
@@ -368,6 +373,7 @@ function testEngine (json) {
 }
 
 function unParsePeople (json) { return parsePeople(json, true) }
+
 function parsePeople (json, un) {
   var fn = un ? unParsePerson : parsePerson
   if (json.author) json.author = fn(json.author)
@@ -376,6 +382,7 @@ function parsePeople (json, un) {
   })
   return json
 }
+
 function unParsePerson (person) {
   if (typeof person === "string") return person
   var name = person.name || ""
@@ -385,6 +392,7 @@ function unParsePerson (person) {
     , email = e ? (" <"+e+">") : ""
   return name+email+url
 }
+
 function parsePerson (person) {
   if (typeof person !== "string") return person
   var name = person.match(/^([^\(<]+)/)
@@ -396,3 +404,13 @@ function parsePerson (person) {
   if (url) obj.url = url[1]
   return obj
 }
+
+function clearCache (prefix) {
+  if (!prefix) {
+    cache = {}
+    return
+  }
+  Object.keys(cache).forEach(function (c) {
+    if (c.indexOf(prefix) === 0) delete cache[c]
+  })
+}