diff --git a/spec/project-spec.coffee b/spec/project-spec.coffee
index b05543ad1..0583a0749 100644
--- a/spec/project-spec.coffee
+++ b/spec/project-spec.coffee
@@ -4,7 +4,6 @@ Project = require '../src/project'
 _ = require 'underscore-plus'
 fs = require 'fs-plus'
 path = require 'path'
-platform = require './spec-helper-platform'
 BufferedProcess = require '../src/buffered-process'
 
 describe "Project", ->
@@ -195,290 +194,6 @@ describe "Project", ->
       expect(atom.project.getPaths()[0]).toEqual path.dirname(require.resolve('./fixtures/dir/a'))
       expect(atom.project.getDirectories()[0].path).toEqual path.dirname(require.resolve('./fixtures/dir/a'))
 
-  describe ".replace()", ->
-    [filePath, commentFilePath, sampleContent, sampleCommentContent] = []
-
-    beforeEach ->
-      atom.project.setPaths([atom.project.resolve('../')])
-
-      filePath = atom.project.resolve('sample.js')
-      commentFilePath = atom.project.resolve('sample-with-comments.js')
-      sampleContent = fs.readFileSync(filePath).toString()
-      sampleCommentContent = fs.readFileSync(commentFilePath).toString()
-
-    afterEach ->
-      fs.writeFileSync(filePath, sampleContent)
-      fs.writeFileSync(commentFilePath, sampleCommentContent)
-
-    describe "when a file doesn't exist", ->
-      it "calls back with an error", ->
-        errors = []
-        missingPath = path.resolve('/not-a-file.js')
-        expect(fs.existsSync(missingPath)).toBeFalsy()
-
-        waitsForPromise ->
-          atom.project.replace /items/gi, 'items', [missingPath], (result, error) ->
-            errors.push(error)
-
-        runs ->
-          expect(errors).toHaveLength 1
-          expect(errors[0].path).toBe missingPath
-
-    describe "when called with unopened files", ->
-      it "replaces properly", ->
-        results = []
-        waitsForPromise ->
-          atom.project.replace /items/gi, 'items', [filePath], (result) ->
-            results.push(result)
-
-        runs ->
-          expect(results).toHaveLength 1
-          expect(results[0].filePath).toBe filePath
-          expect(results[0].replacements).toBe 6
-
-    describe "when a buffer is already open", ->
-      it "replaces properly and saves when not modified", ->
-        editor = null
-        results = []
-
-        waitsForPromise ->
-          atom.project.open('sample.js').then (o) -> editor = o
-
-        runs ->
-          expect(editor.isModified()).toBeFalsy()
-
-        waitsForPromise ->
-          atom.project.replace /items/gi, 'items', [filePath], (result) ->
-            results.push(result)
-
-        runs ->
-          expect(results).toHaveLength 1
-          expect(results[0].filePath).toBe filePath
-          expect(results[0].replacements).toBe 6
-
-          expect(editor.isModified()).toBeFalsy()
-
-      it "does not replace when the path is not specified", ->
-        editor = null
-        results = []
-
-        waitsForPromise ->
-          atom.project.open('sample-with-comments.js').then (o) -> editor = o
-
-        waitsForPromise ->
-          atom.project.replace /items/gi, 'items', [commentFilePath], (result) ->
-            results.push(result)
-
-        runs ->
-          expect(results).toHaveLength 1
-          expect(results[0].filePath).toBe commentFilePath
-
-      it "does NOT save when modified", ->
-        editor = null
-        results = []
-
-        waitsForPromise ->
-          atom.project.open('sample.js').then (o) -> editor = o
-
-        runs ->
-          editor.buffer.setTextInRange([[0,0],[0,0]], 'omg')
-          expect(editor.isModified()).toBeTruthy()
-
-        waitsForPromise ->
-          atom.project.replace /items/gi, 'okthen', [filePath], (result) ->
-            results.push(result)
-
-        runs ->
-          expect(results).toHaveLength 1
-          expect(results[0].filePath).toBe filePath
-          expect(results[0].replacements).toBe 6
-
-          expect(editor.isModified()).toBeTruthy()
-
-  describe ".scan(options, callback)", ->
-    describe "when called with a regex", ->
-      it "calls the callback with all regex results in all files in the project", ->
-        results = []
-        waitsForPromise ->
-          atom.project.scan /(a)+/, (result) ->
-            results.push(result)
-
-        runs ->
-          expect(results).toHaveLength(3)
-          expect(results[0].filePath).toBe atom.project.resolve('a')
-          expect(results[0].matches).toHaveLength(3)
-          expect(results[0].matches[0]).toEqual
-            matchText: 'aaa'
-            lineText: 'aaa bbb'
-            lineTextOffset: 0
-            range: [[0, 0], [0, 3]]
-
-      it "works with with escaped literals (like $ and ^)", ->
-        results = []
-        waitsForPromise ->
-          atom.project.scan /\$\w+/, (result) -> results.push(result)
-
-        runs ->
-          expect(results.length).toBe 1
-
-          {filePath, matches} = results[0]
-          expect(filePath).toBe atom.project.resolve('a')
-          expect(matches).toHaveLength 1
-          expect(matches[0]).toEqual
-            matchText: '$bill'
-            lineText: 'dollar$bill'
-            lineTextOffset: 0
-            range: [[2, 6], [2, 11]]
-
-      it "works on evil filenames", ->
-        platform.generateEvilFiles()
-        atom.project.setPaths([path.join(__dirname, 'fixtures', 'evil-files')])
-        paths = []
-        matches = []
-        waitsForPromise ->
-          atom.project.scan /evil/, (result) ->
-            paths.push(result.filePath)
-            matches = matches.concat(result.matches)
-
-        runs ->
-          _.each(matches, (m) -> expect(m.matchText).toEqual 'evil')
-
-          if platform.isWindows()
-            expect(paths.length).toBe 3
-            expect(paths[0]).toMatch /a_file_with_utf8.txt$/
-            expect(paths[1]).toMatch /file with spaces.txt$/
-            expect(path.basename(paths[2])).toBe "utfa\u0306.md"
-          else
-            expect(paths.length).toBe 5
-            expect(paths[0]).toMatch /a_file_with_utf8.txt$/
-            expect(paths[1]).toMatch /file with spaces.txt$/
-            expect(paths[2]).toMatch /goddam\nnewlines$/m
-            expect(paths[3]).toMatch /quote".txt$/m
-            expect(path.basename(paths[4])).toBe "utfa\u0306.md"
-
-      it "ignores case if the regex includes the `i` flag", ->
-        results = []
-        waitsForPromise ->
-          atom.project.scan /DOLLAR/i, (result) -> results.push(result)
-
-        runs ->
-          expect(results).toHaveLength 1
-
-      describe "when the core.excludeVcsIgnoredPaths config is truthy", ->
-        [projectPath, ignoredPath] = []
-
-        beforeEach ->
-          sourceProjectPath = path.join(__dirname, 'fixtures', 'git', 'working-dir')
-          projectPath = path.join(temp.mkdirSync("atom"))
-
-          writerStream = fstream.Writer(projectPath)
-          fstream.Reader(sourceProjectPath).pipe(writerStream)
-
-          waitsFor (done) ->
-            writerStream.on 'close', done
-            writerStream.on 'error', done
-
-          runs ->
-            fs.rename(path.join(projectPath, 'git.git'), path.join(projectPath, '.git'))
-            ignoredPath = path.join(projectPath, 'ignored.txt')
-            fs.writeFileSync(ignoredPath, 'this match should not be included')
-
-        afterEach ->
-          fs.removeSync(projectPath) if fs.existsSync(projectPath)
-
-        it "excludes ignored files", ->
-          atom.project.setPaths([projectPath])
-          atom.config.set('core.excludeVcsIgnoredPaths', true)
-          resultHandler = jasmine.createSpy("result found")
-          waitsForPromise ->
-            atom.project.scan /match/, (results) ->
-              resultHandler()
-
-          runs ->
-            expect(resultHandler).not.toHaveBeenCalled()
-
-      it "includes only files when a directory filter is specified", ->
-        projectPath = path.join(path.join(__dirname, 'fixtures', 'dir'))
-        atom.project.setPaths([projectPath])
-
-        filePath = path.join(projectPath, 'a-dir', 'oh-git')
-
-        paths = []
-        matches = []
-        waitsForPromise ->
-          atom.project.scan /aaa/, paths: ["a-dir#{path.sep}"], (result) ->
-            paths.push(result.filePath)
-            matches = matches.concat(result.matches)
-
-        runs ->
-          expect(paths.length).toBe 1
-          expect(paths[0]).toBe filePath
-          expect(matches.length).toBe 1
-
-      it "includes files and folders that begin with a '.'", ->
-        projectPath = temp.mkdirSync()
-        filePath = path.join(projectPath, '.text')
-        fs.writeFileSync(filePath, 'match this')
-        atom.project.setPaths([projectPath])
-        paths = []
-        matches = []
-        waitsForPromise ->
-          atom.project.scan /match this/, (result) ->
-            paths.push(result.filePath)
-            matches = matches.concat(result.matches)
-
-        runs ->
-          expect(paths.length).toBe 1
-          expect(paths[0]).toBe filePath
-          expect(matches.length).toBe 1
-
-      it "excludes values in core.ignoredNames", ->
-        projectPath = path.join(__dirname, 'fixtures', 'git', 'working-dir')
-        ignoredNames = atom.config.get("core.ignoredNames")
-        ignoredNames.push("a")
-        atom.config.set("core.ignoredNames", ignoredNames)
-
-        resultHandler = jasmine.createSpy("result found")
-        waitsForPromise ->
-          atom.project.scan /dollar/, (results) ->
-            resultHandler()
-
-        runs ->
-          expect(resultHandler).not.toHaveBeenCalled()
-
-      it "scans buffer contents if the buffer is modified", ->
-        editor = null
-        results = []
-
-        waitsForPromise ->
-          atom.project.open('a').then (o) ->
-            editor = o
-            editor.setText("Elephant")
-
-        waitsForPromise ->
-          atom.project.scan /a|Elephant/, (result) -> results.push result
-
-        runs ->
-          expect(results).toHaveLength 3
-          resultForA = _.find results, ({filePath}) -> path.basename(filePath) == 'a'
-          expect(resultForA.matches).toHaveLength 1
-          expect(resultForA.matches[0].matchText).toBe 'Elephant'
-
-      it "ignores buffers outside the project", ->
-        editor = null
-        results = []
-
-        waitsForPromise ->
-          atom.project.open(temp.openSync().path).then (o) ->
-            editor = o
-            editor.setText("Elephant")
-
-        waitsForPromise ->
-          atom.project.scan /Elephant/, (result) -> results.push result
-
-        runs ->
-          expect(results).toHaveLength 0
-
   describe ".eachBuffer(callback)", ->
     beforeEach ->
       atom.project.bufferForPathSync('a')
diff --git a/spec/workspace-spec.coffee b/spec/workspace-spec.coffee
index 453e70c03..b96bc79af 100644
--- a/spec/workspace-spec.coffee
+++ b/spec/workspace-spec.coffee
@@ -2,6 +2,10 @@ path = require 'path'
 temp = require 'temp'
 Workspace = require '../src/workspace'
 {View} = require '../src/space-pen-extensions'
+platform = require './spec-helper-platform'
+_ = require 'underscore-plus'
+fstream = require 'fstream'
+fs = require 'fs-plus'
 
 describe "Workspace", ->
   workspace = null
@@ -553,3 +557,287 @@ describe "Workspace", ->
 
         expect(atom.workspace.panelForItem(item)).toBe panel
         expect(atom.workspace.panelForItem(itemWithNoPanel)).toBe null
+
+  describe "::scan(regex, options, callback)", ->
+    describe "when called with a regex", ->
+      it "calls the callback with all regex results in all files in the project", ->
+        results = []
+        waitsForPromise ->
+          atom.workspace.scan /(a)+/, (result) ->
+            results.push(result)
+
+        runs ->
+          expect(results).toHaveLength(3)
+          expect(results[0].filePath).toBe atom.project.resolve('a')
+          expect(results[0].matches).toHaveLength(3)
+          expect(results[0].matches[0]).toEqual
+            matchText: 'aaa'
+            lineText: 'aaa bbb'
+            lineTextOffset: 0
+            range: [[0, 0], [0, 3]]
+
+      it "works with with escaped literals (like $ and ^)", ->
+        results = []
+        waitsForPromise ->
+          atom.workspace.scan /\$\w+/, (result) -> results.push(result)
+
+        runs ->
+          expect(results.length).toBe 1
+
+          {filePath, matches} = results[0]
+          expect(filePath).toBe atom.project.resolve('a')
+          expect(matches).toHaveLength 1
+          expect(matches[0]).toEqual
+            matchText: '$bill'
+            lineText: 'dollar$bill'
+            lineTextOffset: 0
+            range: [[2, 6], [2, 11]]
+
+      it "works on evil filenames", ->
+        platform.generateEvilFiles()
+        atom.project.setPaths([path.join(__dirname, 'fixtures', 'evil-files')])
+        paths = []
+        matches = []
+        waitsForPromise ->
+          atom.workspace.scan /evil/, (result) ->
+            paths.push(result.filePath)
+            matches = matches.concat(result.matches)
+
+        runs ->
+          _.each(matches, (m) -> expect(m.matchText).toEqual 'evil')
+
+          if platform.isWindows()
+            expect(paths.length).toBe 3
+            expect(paths[0]).toMatch /a_file_with_utf8.txt$/
+            expect(paths[1]).toMatch /file with spaces.txt$/
+            expect(path.basename(paths[2])).toBe "utfa\u0306.md"
+          else
+            expect(paths.length).toBe 5
+            expect(paths[0]).toMatch /a_file_with_utf8.txt$/
+            expect(paths[1]).toMatch /file with spaces.txt$/
+            expect(paths[2]).toMatch /goddam\nnewlines$/m
+            expect(paths[3]).toMatch /quote".txt$/m
+            expect(path.basename(paths[4])).toBe "utfa\u0306.md"
+
+      it "ignores case if the regex includes the `i` flag", ->
+        results = []
+        waitsForPromise ->
+          atom.workspace.scan /DOLLAR/i, (result) -> results.push(result)
+
+        runs ->
+          expect(results).toHaveLength 1
+
+      describe "when the core.excludeVcsIgnoredPaths config is truthy", ->
+        [projectPath, ignoredPath] = []
+
+        beforeEach ->
+          sourceProjectPath = path.join(__dirname, 'fixtures', 'git', 'working-dir')
+          projectPath = path.join(temp.mkdirSync("atom"))
+
+          writerStream = fstream.Writer(projectPath)
+          fstream.Reader(sourceProjectPath).pipe(writerStream)
+
+          waitsFor (done) ->
+            writerStream.on 'close', done
+            writerStream.on 'error', done
+
+          runs ->
+            fs.rename(path.join(projectPath, 'git.git'), path.join(projectPath, '.git'))
+            ignoredPath = path.join(projectPath, 'ignored.txt')
+            fs.writeFileSync(ignoredPath, 'this match should not be included')
+
+        afterEach ->
+          fs.removeSync(projectPath) if fs.existsSync(projectPath)
+
+        it "excludes ignored files", ->
+          atom.project.setPaths([projectPath])
+          atom.config.set('core.excludeVcsIgnoredPaths', true)
+          resultHandler = jasmine.createSpy("result found")
+          waitsForPromise ->
+            atom.workspace.scan /match/, (results) ->
+              resultHandler()
+
+          runs ->
+            expect(resultHandler).not.toHaveBeenCalled()
+
+      it "includes only files when a directory filter is specified", ->
+        projectPath = path.join(path.join(__dirname, 'fixtures', 'dir'))
+        atom.project.setPaths([projectPath])
+
+        filePath = path.join(projectPath, 'a-dir', 'oh-git')
+
+        paths = []
+        matches = []
+        waitsForPromise ->
+          atom.workspace.scan /aaa/, paths: ["a-dir#{path.sep}"], (result) ->
+            paths.push(result.filePath)
+            matches = matches.concat(result.matches)
+
+        runs ->
+          expect(paths.length).toBe 1
+          expect(paths[0]).toBe filePath
+          expect(matches.length).toBe 1
+
+      it "includes files and folders that begin with a '.'", ->
+        projectPath = temp.mkdirSync()
+        filePath = path.join(projectPath, '.text')
+        fs.writeFileSync(filePath, 'match this')
+        atom.project.setPaths([projectPath])
+        paths = []
+        matches = []
+        waitsForPromise ->
+          atom.workspace.scan /match this/, (result) ->
+            paths.push(result.filePath)
+            matches = matches.concat(result.matches)
+
+        runs ->
+          expect(paths.length).toBe 1
+          expect(paths[0]).toBe filePath
+          expect(matches.length).toBe 1
+
+      it "excludes values in core.ignoredNames", ->
+        projectPath = path.join(__dirname, 'fixtures', 'git', 'working-dir')
+        ignoredNames = atom.config.get("core.ignoredNames")
+        ignoredNames.push("a")
+        atom.config.set("core.ignoredNames", ignoredNames)
+
+        resultHandler = jasmine.createSpy("result found")
+        waitsForPromise ->
+          atom.workspace.scan /dollar/, (results) ->
+            resultHandler()
+
+        runs ->
+          expect(resultHandler).not.toHaveBeenCalled()
+
+      it "scans buffer contents if the buffer is modified", ->
+        editor = null
+        results = []
+
+        waitsForPromise ->
+          atom.project.open('a').then (o) ->
+            editor = o
+            editor.setText("Elephant")
+
+        waitsForPromise ->
+          atom.workspace.scan /a|Elephant/, (result) -> results.push result
+
+        runs ->
+          expect(results).toHaveLength 3
+          resultForA = _.find results, ({filePath}) -> path.basename(filePath) == 'a'
+          expect(resultForA.matches).toHaveLength 1
+          expect(resultForA.matches[0].matchText).toBe 'Elephant'
+
+      it "ignores buffers outside the project", ->
+        editor = null
+        results = []
+
+        waitsForPromise ->
+          atom.project.open(temp.openSync().path).then (o) ->
+            editor = o
+            editor.setText("Elephant")
+
+        waitsForPromise ->
+          atom.workspace.scan /Elephant/, (result) -> results.push result
+
+        runs ->
+          expect(results).toHaveLength 0
+
+  describe "::replace(regex, replacementText, paths, iterator)", ->
+    [filePath, commentFilePath, sampleContent, sampleCommentContent] = []
+
+    beforeEach ->
+      atom.project.setPaths([atom.project.resolve('../')])
+
+      filePath = atom.project.resolve('sample.js')
+      commentFilePath = atom.project.resolve('sample-with-comments.js')
+      sampleContent = fs.readFileSync(filePath).toString()
+      sampleCommentContent = fs.readFileSync(commentFilePath).toString()
+
+    afterEach ->
+      fs.writeFileSync(filePath, sampleContent)
+      fs.writeFileSync(commentFilePath, sampleCommentContent)
+
+    describe "when a file doesn't exist", ->
+      it "calls back with an error", ->
+        errors = []
+        missingPath = path.resolve('/not-a-file.js')
+        expect(fs.existsSync(missingPath)).toBeFalsy()
+
+        waitsForPromise ->
+          atom.workspace.replace /items/gi, 'items', [missingPath], (result, error) ->
+            errors.push(error)
+
+        runs ->
+          expect(errors).toHaveLength 1
+          expect(errors[0].path).toBe missingPath
+
+    describe "when called with unopened files", ->
+      it "replaces properly", ->
+        results = []
+        waitsForPromise ->
+          atom.workspace.replace /items/gi, 'items', [filePath], (result) ->
+            results.push(result)
+
+        runs ->
+          expect(results).toHaveLength 1
+          expect(results[0].filePath).toBe filePath
+          expect(results[0].replacements).toBe 6
+
+    describe "when a buffer is already open", ->
+      it "replaces properly and saves when not modified", ->
+        editor = null
+        results = []
+
+        waitsForPromise ->
+          atom.project.open('sample.js').then (o) -> editor = o
+
+        runs ->
+          expect(editor.isModified()).toBeFalsy()
+
+        waitsForPromise ->
+          atom.workspace.replace /items/gi, 'items', [filePath], (result) ->
+            results.push(result)
+
+        runs ->
+          expect(results).toHaveLength 1
+          expect(results[0].filePath).toBe filePath
+          expect(results[0].replacements).toBe 6
+
+          expect(editor.isModified()).toBeFalsy()
+
+      it "does not replace when the path is not specified", ->
+        editor = null
+        results = []
+
+        waitsForPromise ->
+          atom.project.open('sample-with-comments.js').then (o) -> editor = o
+
+        waitsForPromise ->
+          atom.workspace.replace /items/gi, 'items', [commentFilePath], (result) ->
+            results.push(result)
+
+        runs ->
+          expect(results).toHaveLength 1
+          expect(results[0].filePath).toBe commentFilePath
+
+      it "does NOT save when modified", ->
+        editor = null
+        results = []
+
+        waitsForPromise ->
+          atom.project.open('sample.js').then (o) -> editor = o
+
+        runs ->
+          editor.buffer.setTextInRange([[0,0],[0,0]], 'omg')
+          expect(editor.isModified()).toBeTruthy()
+
+        waitsForPromise ->
+          atom.workspace.replace /items/gi, 'okthen', [filePath], (result) ->
+            results.push(result)
+
+        runs ->
+          expect(results).toHaveLength 1
+          expect(results[0].filePath).toBe filePath
+          expect(results[0].replacements).toBe 6
+
+          expect(editor.isModified()).toBeTruthy()
diff --git a/src/project.coffee b/src/project.coffee
index 0eba6c7bd..005c23165 100644
--- a/src/project.coffee
+++ b/src/project.coffee
@@ -176,92 +176,13 @@ class Project extends Model
   Section: Searching and Replacing
   ###
 
-  # Public: Performs a search across all the files in the project.
-  #
-  # * `regex` {RegExp} to search with.
-  # * `options` (optional) {Object} (default: {})
-  #   * `paths` An {Array} of glob patterns to search within
-  # * `iterator` {Function} callback on each file found
   scan: (regex, options={}, iterator) ->
-    if _.isFunction(options)
-      iterator = options
-      options = {}
+    Grim.deprecate("Use atom.workspace.scan instead of atom.project.scan")
+    atom.workspace.scan(regex, options, iterator)
 
-    deferred = Q.defer()
-
-    searchOptions =
-      ignoreCase: regex.ignoreCase
-      inclusions: options.paths
-      includeHidden: true
-      excludeVcsIgnores: atom.config.get('core.excludeVcsIgnoredPaths')
-      exclusions: atom.config.get('core.ignoredNames')
-      follow: atom.config.get('core.followSymlinks')
-
-    # TODO: need to support all paths in @getPaths()
-    task = Task.once require.resolve('./scan-handler'), @getPaths()[0], regex.source, searchOptions, ->
-      deferred.resolve()
-
-    task.on 'scan:result-found', (result) =>
-      iterator(result) unless @isPathModified(result.filePath)
-
-    task.on 'scan:file-error', (error) ->
-      iterator(null, error)
-
-    if _.isFunction(options.onPathsSearched)
-      task.on 'scan:paths-searched', (numberOfPathsSearched) ->
-        options.onPathsSearched(numberOfPathsSearched)
-
-    for buffer in @getBuffers() when buffer.isModified()
-      filePath = buffer.getPath()
-      continue unless @contains(filePath)
-      matches = []
-      buffer.scan regex, (match) -> matches.push match
-      iterator {filePath, matches} if matches.length > 0
-
-    promise = deferred.promise
-    promise.cancel = ->
-      task.terminate()
-      deferred.resolve('cancelled')
-    promise
-
-  # Public: Performs a replace across all the specified files in the project.
-  #
-  # * `regex` A {RegExp} to search with.
-  # * `replacementText` Text to replace all matches of regex with
-  # * `filePaths` List of file path strings to run the replace on.
-  # * `iterator` A {Function} callback on each file with replacements:
-  #   * `options` {Object} with keys `filePath` and `replacements`
   replace: (regex, replacementText, filePaths, iterator) ->
-    deferred = Q.defer()
-
-    openPaths = (buffer.getPath() for buffer in @getBuffers())
-    outOfProcessPaths = _.difference(filePaths, openPaths)
-
-    inProcessFinished = !openPaths.length
-    outOfProcessFinished = !outOfProcessPaths.length
-    checkFinished = ->
-      deferred.resolve() if outOfProcessFinished and inProcessFinished
-
-    unless outOfProcessFinished.length
-      flags = 'g'
-      flags += 'i' if regex.ignoreCase
-
-      task = Task.once require.resolve('./replace-handler'), outOfProcessPaths, regex.source, flags, replacementText, ->
-        outOfProcessFinished = true
-        checkFinished()
-
-      task.on 'replace:path-replaced', iterator
-      task.on 'replace:file-error', (error) -> iterator(null, error)
-
-    for buffer in @getBuffers()
-      continue unless buffer.getPath() in filePaths
-      replacements = buffer.replace(regex, replacementText, iterator)
-      iterator({filePath: buffer.getPath(), replacements}) if replacements
-
-    inProcessFinished = true
-    checkFinished()
-
-    deferred.promise
+    Grim.deprecate("Use atom.workspace.replace instead of atom.project.replace")
+    atom.workspace.replace(regex, replacementText, filePaths, iterator)
 
   ###
   Section: Private
diff --git a/src/workspace.coffee b/src/workspace.coffee
index 00a4550bc..aaca0bf02 100644
--- a/src/workspace.coffee
+++ b/src/workspace.coffee
@@ -14,6 +14,7 @@ PanelElement = require './panel-element'
 PanelContainer = require './panel-container'
 PanelContainerElement = require './panel-container-element'
 WorkspaceElement = require './workspace-element'
+Task = require './task'
 
 # Essential: Represents the state of the user interface for the entire window.
 # An instance of this class is available via the `atom.workspace` global.
@@ -780,3 +781,98 @@ class Workspace extends Model
   addPanel: (location, options) ->
     options ?= {}
     @panelContainers[location].addPanel(new Panel(options))
+
+  ###
+  Section: Searching and Replacing
+  ###
+
+  # Public: Performs a search across all the files in the workspace.
+  #
+  # * `regex` {RegExp} to search with.
+  # * `options` (optional) {Object} (default: {})
+  #   * `paths` An {Array} of glob patterns to search within
+  # * `iterator` {Function} callback on each file found
+  #
+  # Returns a `Promise`.
+  scan: (regex, options={}, iterator) ->
+    if _.isFunction(options)
+      iterator = options
+      options = {}
+
+    deferred = Q.defer()
+
+    searchOptions =
+      ignoreCase: regex.ignoreCase
+      inclusions: options.paths
+      includeHidden: true
+      excludeVcsIgnores: atom.config.get('core.excludeVcsIgnoredPaths')
+      exclusions: atom.config.get('core.ignoredNames')
+      follow: atom.config.get('core.followSymlinks')
+
+    # TODO: need to support all paths in @getPaths()
+    task = Task.once require.resolve('./scan-handler'), atom.project.getPaths()[0], regex.source, searchOptions, ->
+      deferred.resolve()
+
+    task.on 'scan:result-found', (result) =>
+      iterator(result) unless atom.project.isPathModified(result.filePath)
+
+    task.on 'scan:file-error', (error) ->
+      iterator(null, error)
+
+    if _.isFunction(options.onPathsSearched)
+      task.on 'scan:paths-searched', (numberOfPathsSearched) ->
+        options.onPathsSearched(numberOfPathsSearched)
+
+    for buffer in atom.project.getBuffers() when buffer.isModified()
+      filePath = buffer.getPath()
+      continue unless atom.project.contains(filePath)
+      matches = []
+      buffer.scan regex, (match) -> matches.push match
+      iterator {filePath, matches} if matches.length > 0
+
+    promise = deferred.promise
+    promise.cancel = ->
+      task.terminate()
+      deferred.resolve('cancelled')
+    promise
+
+  # Public: Performs a replace across all the specified files in the project.
+  #
+  # * `regex` A {RegExp} to search with.
+  # * `replacementText` Text to replace all matches of regex with
+  # * `filePaths` List of file path strings to run the replace on.
+  # * `iterator` A {Function} callback on each file with replacements:
+  #   * `options` {Object} with keys `filePath` and `replacements`
+  #
+  # Returns a `Promise`.
+  replace: (regex, replacementText, filePaths, iterator) ->
+    deferred = Q.defer()
+
+    openPaths = (buffer.getPath() for buffer in atom.project.getBuffers())
+    outOfProcessPaths = _.difference(filePaths, openPaths)
+
+    inProcessFinished = !openPaths.length
+    outOfProcessFinished = !outOfProcessPaths.length
+    checkFinished = ->
+      deferred.resolve() if outOfProcessFinished and inProcessFinished
+
+    unless outOfProcessFinished.length
+      flags = 'g'
+      flags += 'i' if regex.ignoreCase
+
+      task = Task.once require.resolve('./replace-handler'), outOfProcessPaths, regex.source, flags, replacementText, ->
+        outOfProcessFinished = true
+        checkFinished()
+
+      task.on 'replace:path-replaced', iterator
+      task.on 'replace:file-error', (error) -> iterator(null, error)
+
+    for buffer in atom.project.getBuffers()
+      continue unless buffer.getPath() in filePaths
+      replacements = buffer.replace(regex, replacementText, iterator)
+      iterator({filePath: buffer.getPath(), replacements}) if replacements
+
+    inProcessFinished = true
+    checkFinished()
+
+    deferred.promise