Add Atom.getAvailablePackageMetadata()

This includes the metadata for all available packages
whether or not they are currently loaded.

src/app/atom.coffee

@@ -115,6 +115,14 @@ _.extend atom,
   getAvailablePackageNames: ->
     fsUtils.base(path) for path in @getAvailablePackagePaths()
 
+  getAvailablePackageMetadata: ->
+    packages = []
+    for packagePath in atom.getAvailablePackagePaths()
+      name = fsUtils.base(packagePath)
+      metadata = atom.getLoadedPackage(name)?.metadata ? Package.loadMetadata(path, true)
+      packages.push(metadata)
+    packages
+
   loadThemes: ->
     themeNames = config.get("core.themes")
     themeNames = [themeNames] unless _.isArray(themeNames)

src/app/installed-packages-config-panel.coffee

@@ -12,12 +12,5 @@ class InstalledPackagesConfigPanel extends ConfigPanel
     @div class: 'installed-packages'
 
   initialize: ->
-    for packagePath in atom.getAvailablePackagePaths().sort()
-      name = path.basename(packagePath)
-      metadata = atom.getLoadedPackage(name)?.metadata
-      unless metadata
-        try
-          metadata = Package.loadMetadata()
-        catch e
-          metadata = {name}
+    for metadata in _.sortBy(atom.getAvailablePackageMetadata(), 'name')
       @append(new PackageConfigView(metadata))

src/app/package-config-view.coffee

@@ -102,7 +102,7 @@ class PackageConfigView extends View
 
     @updateDefaultAction()
 
-    @enableToggle.find('a').on 'click', => @togglePackageEnablement
+    @enableToggle.find('a').on 'click', => @togglePackageEnablement()
 
     @observeConfig 'core.disabledPackages', =>
       @updatePackageState()

src/app/package.coffee

@@ -18,9 +18,12 @@ class Package
     pack.load(options)
     pack
 
-  @loadMetadata: (path) ->
+  @loadMetadata: (path, ignoreErrors=false) ->
     if metadataPath = CSON.resolve(join(path, 'package'))
-      metadata = CSON.readFileSync(metadataPath)
+      try
+        metadata = CSON.readFileSync(metadataPath)
+      catch e
+        throw e unless ignoreErrors
     metadata ?= {}
     metadata.name = basename(path)
     metadata