Make all edit session uri's relative

This allows them to be collaborated without having absolute paths
in the shared document.

src/app/directory.coffee

@@ -49,7 +49,9 @@ class Directory
   # pathToCheck - the {String} path to check.
   #
   # Returns a {Boolean}.
-  contains: (pathToCheck='') ->
+  contains: (pathToCheck) ->
+    return false unless pathToCheck
+
     if pathToCheck.indexOf(path.join(@getPath(), path.sep)) is 0
       true
     else if pathToCheck.indexOf(path.join(@getRealPath(), path.sep)) is 0
@@ -62,7 +64,9 @@ class Directory
   # fullPath - The {String} path to convert.
   #
   # Returns a {String}.
-  relativize: (fullPath='') ->
+  relativize: (fullPath) ->
+    return fullPath unless fullPath
+
     if fullPath is @getPath()
       ''
     else if fullPath.indexOf(path.join(@getPath(), path.sep)) is 0

src/app/edit-session.coffee

@@ -304,7 +304,7 @@ class EditSession
   # Retrieves the current buffer's URI.
   #
   # Returns a {String}.
-  getUri: -> @getPath()
+  getUri: -> @buffer.getUri()
 
   # {Delegates to: Buffer.isRowBlank}
   isBufferRowBlank: (bufferRow) -> @buffer.isRowBlank(bufferRow)

src/app/project.coffee

@@ -162,6 +162,7 @@ class Project
   #
   # Returns either an {EditSession} (for text) or {ImageEditSession} (for images).
   open: (filePath, options={}) ->
+    filePath = @resolve(filePath) if filePath?
     for opener in @constructor.openers
       return resource if resource = opener(filePath, options)
 

src/app/root-view.coffee

@@ -114,7 +114,7 @@ class RootView extends View
   # Returns the `EditSession` for the file URI.
   open: (path, options = {}) ->
     changeFocus = options.changeFocus ? true
-    path = project.resolve(path) if path?
+    path = project.relativize(path)
     if activePane = @getActivePane()
       editSession = activePane.itemForUri(path) ? project.open(path)
       activePane.showItem(editSession)

src/app/text-buffer.coffee

@@ -74,7 +74,7 @@ class TextBuffer
 
   serialize: ->
     deserializer: 'TextBuffer'
-    path: @getPath()
+    path: @getUri()
     text: @getText() if @isModified()
 
   @deserialize: ({path, text}) ->
@@ -133,6 +133,9 @@ class TextBuffer
   getPath: ->
     @file?.getPath()
 
+  getUri: ->
+    project?.relativize(@getPath()) ? @getPath()
+
   # Sets the path for the file.
   #
   # path - A {String} representing the new file path

src/packages/archive-view/lib/archive-edit-session.coffee

@@ -14,10 +14,11 @@ class ArchiveEditSession
       new ArchiveEditSession(filePath) if archive.isPathSupported(filePath)
 
   @deserialize: ({path}={}) ->
+    path = project.resolve(path)
     if fsUtils.isFileSync(path)
       new ArchiveEditSession(path)
     else
-      console.warn "Could not build edit session for path '#{path}' because that file no longer exists"
+      console.warn "Could not build archive edit session for path '#{path}' because that file no longer exists"
 
   constructor: (@path) ->
     @file = new File(@path)
@@ -27,7 +28,7 @@ class ArchiveEditSession
 
   serialize: ->
     deserializer: 'ArchiveEditSession'
-    path: @path
+    path: @getUri()
 
   getViewClass: ->
     require './archive-view'
@@ -38,7 +39,7 @@ class ArchiveEditSession
     else
       'untitled'
 
-  getUri: -> @path
+  getUri: -> project?.relativize(@getPath()) ? @getPath()
 
   getPath: -> @path
 

src/packages/image-view/lib/image-edit-session.coffee

@@ -18,7 +18,8 @@ class ImageEditSession
         new ImageEditSession(filePath)
 
   @deserialize: ({path}={}) ->
-    if fsUtils.exists(path)
+    path = project.resolve(path)
+    if fsUtils.isFileSync(path)
       new ImageEditSession(path)
     else
       console.warn "Could not build image edit session for path '#{path}' because that file no longer exists"
@@ -27,7 +28,7 @@ class ImageEditSession
 
   serialize: ->
     deserializer: 'ImageEditSession'
-    path: @path
+    path: @getUri()
 
   getViewClass: ->
     require './image-view'
@@ -48,7 +49,7 @@ class ImageEditSession
   # Retrieves the URI of the current image.
   #
   # Returns a {String}.
-  getUri: -> @path
+  getUri: -> project?.relativize(@getPath()) ? @getPath()
 
   # Retrieves the path of the current image.
   #