Merge pull request #400 from ethereum/files-api

src/app/files.js

+'use strict'
+
+var EventManager = require('../lib/eventManager')
+
+function Files (storage) {
+  var event = new EventManager()
+  this.event = event
+  var readonly = {}
+
+  this.exists = function (path) {
+    // NOTE: ignore the config file
+    if (path === '.browser-solidity.json') {
+      return false
+    }
+
+    return this.isReadOnly(path) || storage.exists(path)
+  }
+
+  this.get = function (path) {
+    // NOTE: ignore the config file
+    if (path === '.browser-solidity.json') {
+      return null
+    }
+
+    return readonly[path] || storage.get(path)
+  }
+
+  this.set = function (path, content) {
+    // NOTE: ignore the config file
+    if (path === '.browser-solidity.json') {
+      return false
+    }
+
+    if (!this.isReadOnly(path)) {
+      var exists = storage.exists(path)
+      if (!storage.set(path, content)) {
+        return false
+      }
+      if (!exists) {
+        event.trigger('fileAdded', [path, false])
+      } else {
+        event.trigger('fileChanged', [path])
+      }
+      return true
+    }
+
+    return false
+  }
+
+  this.addReadOnly = function (path, content) {
+    if (!storage.exists(path)) {
+      readonly[path] = content
+      event.trigger('fileAdded', [path, true])
+      return true
+    }
+
+    return false
+  }
+
+  this.isReadOnly = function (path) {
+    return !!readonly[path]
+  }
+
+  this.remove = function (path) {
+    if (!this.exists(path)) {
+      return false
+    }
+
+    if (this.isReadOnly(path)) {
+      readonly[path] = undefined
+    } else {
+      if (!storage.remove(path)) {
+        return false
+      }
+    }
+    event.trigger('fileRemoved', [path])
+    return true
+  }
+
+  this.rename = function (oldPath, newPath) {
+    if (!this.isReadOnly(oldPath) && storage.exists(oldPath)) {
+      if (!storage.rename(oldPath, newPath)) {
+        return false
+      }
+      event.trigger('fileRenamed', [oldPath, newPath])
+      return true
+    }
+    return false
+  }
+
+  this.list = function () {
+    var files = {}
+
+    // add r/w files to the list
+    storage.keys().forEach(function (path) {
+      // NOTE: as a temporary measure do not show the config file
+      if (path !== '.browser-solidity.json') {
+        files[path] = false
+      }
+    })
+
+    // add r/o files to the list
+    Object.keys(readonly).forEach(function (path) {
+      files[path] = true
+    })
+
+    return files
+  }
+}
+
+module.exports = Files

src/app/storage.js

@@ -10,7 +10,12 @@ function Storage () {
   }
 
   this.set = function (name, content) {
-    window.localStorage.setItem('sol:' + name, content)
+    try {
+      window.localStorage.setItem('sol:' + name, content)
+    } catch (exception) {
+      return false
+    }
+    return true
   }
 
   function safeKeys () {
@@ -28,12 +33,16 @@ function Storage () {
 
   this.remove = function (name) {
     window.localStorage.removeItem('sol:' + name)
+    return true
   }
 
   this.rename = function (originalName, newName) {
     var content = this.get(originalName)
-    this.set(newName, content)
+    if (!this.set(newName, content)) {
+      return false
+    }
     this.remove(originalName)
+    return true
   }
 
   this.loadFile = function (filename, content) {