Use child_process.spawn from Project.scan

spec/app/project-spec.coffee

@@ -1,6 +1,7 @@
 Project = require 'project'
 fs = require 'fs'
 _ = require 'underscore'
+BufferedProcess = require 'buffered-process'
 
 describe "Project", ->
   beforeEach ->
@@ -239,12 +240,12 @@ describe "Project", ->
           expect(fs.base(paths[4])).toBe "utfa\u0306.md"
 
       it "handles breaks in the search subprocess's output following the filename", ->
-        spyOn $native, 'exec'
+        spyOn(BufferedProcess.prototype, 'bufferStream')
 
         iterator = jasmine.createSpy('iterator')
         project.scan /a+/, iterator
 
-        stdout = $native.exec.argsForCall[0][1].stdout
+        stdout = BufferedProcess.prototype.bufferStream.argsForCall[0][1]
         stdout ":#{require.resolve('fixtures/dir/a')}\n"
         stdout "1;0 3:aaa bbb\n2;3 2:cc aa cc\n"
 

src/app/project.coffee

@@ -6,7 +6,7 @@ Buffer = require 'buffer'
 EditSession = require 'edit-session'
 EventEmitter = require 'event-emitter'
 Directory = require 'directory'
-ChildProcess = require 'child-process'
+BufferedProcess = require 'buffered-process'
 
 module.exports =
 class Project
@@ -159,9 +159,7 @@ class Project
     _.remove(@buffers, buffer)
 
   scan: (regex, iterator) ->
-    command = "#{require.resolve('ag')} --ackmate '#{regex.source}' '#{@getPath()}'"
     bufferedData = ""
-
     state = 'readingPath'
     path = null
 
@@ -193,11 +191,22 @@ class Project
         match = lineText.substr(column, length)
         iterator({path, range, match})
 
-    ChildProcess.exec command , bufferLines: true, stdout: (data) ->
+    deferred = $.Deferred()
+    exit = (code) ->
+      if code is -1
+        deferred.reject({command, code})
+      else
+        deferred.resolve()
+    stdout = (data) ->
       lines = data.split('\n')
       lines.pop() # the last segment is a spurious '' because data always ends in \n due to bufferLines: true
       for line in lines
         readPath(line) if state is 'readingPath'
         readLine(line) if state is 'readingLines'
 
+    command = require.resolve('ag')
+    args = ['--ackmate', regex.source, @getPath()]
+    new BufferedProcess({command, args, stdout, exit})
+    deferred
+
 _.extend Project.prototype, EventEmitter

src/stdlib/buffered-process.coffee

@@ -2,8 +2,8 @@ ChildProcess = nodeRequire 'child_process'
 
 module.exports =
 class BufferedProcess
-  constructor: (options={}) ->
-    process = ChildProcess.spawn(options.command, options.args)
+  constructor: ({command, args, options, stdout, stderr, exit}={}) ->
+    process = ChildProcess.spawn(command, args, options)
 
     stdoutClosed = true
     stderrClosed = true
@@ -11,21 +11,21 @@ class BufferedProcess
     exitCode = 0
     triggerExitCallback = ->
       if stdoutClosed and stderrClosed and processExited
-        options.exit?(exitCode)
+        exit?(exitCode)
 
-    if options.stdout
+    if stdout
       stdoutClosed = false
-      @bufferStream process.stdout, options.stdout, ->
+      @bufferStream process.stdout, stdout, ->
         stdoutClosed = true
         triggerExitCallback()
 
-    if options.stderr
+    if stderr
       stderrClosed = false
-      @bufferStream process.stderr, options.stderr, ->
+      @bufferStream process.stderr, stderr, ->
         stderrClosed = true
         triggerExitCallback()
 
-    if options.exit
+    if exit
       processExited = false
       process.on 'exit', (code) ->
         exitCode = code