diff --git a/lib/autocomplete.coffee b/lib/autocomplete.coffee
new file mode 100644
index 0000000..0995f04
--- /dev/null
+++ b/lib/autocomplete.coffee
@@ -0,0 +1,93 @@
+fuzz = require('fuzzaldrin-plus')
+
+module.exports =
+class AutoCompleter
+  constructor: (repl) ->
+    @repl = repl
+    @classes = null
+    @docs = null
+    # pre-allocate so it only gets compiled once
+    # look for some set of period-separated identifiers before the cursor
+    @prefixRegex = /([A-Za-z0-9_.]*)$/
+
+  handleNakedPrefix: (prefix) ->
+    # currently we onyly have classes in our naked database. If we
+    # add global variables we'll need to tweak this
+    names = fuzz.filter(@classes, prefix, {maxResults: 20})
+    return ({
+      text: name,
+      description: @docs["Classes/#{name}"],
+      type: "class"} for name in names)
+
+  handleClassMemberPrefix: (className, prefix) ->
+    candidates = []
+    return @getClassMethods(className)
+      .then (methods) =>
+        for m in methods
+          candidates.push({
+            text: m.name,
+            description: @makeMethodString(m),
+            type: "method"
+          })
+        return candidates
+
+  makeMethodString: (method) ->
+    argStrings = []
+    sep = ", "
+    N = method.args.length
+    if N == 0
+      # no arguments, show without parens
+      return method.name
+    for i in [0..(N-1)]
+      if method.argDefaults[i] == null
+        argStrings.push(method.args[i])
+      else
+        argStrings.push("#{method.args[i]}=#{method.argDefaults[i]}")
+    return "#{method.name}(#{argStrings.join(sep)})"
+
+  # these introspection commands return nil instead of an empty list
+  # if there aren't any methods/vars. bummer.
+  getClassMethods: (className) ->
+    code = """
+    if(#{className}.class.methods.isNil, {[]}, {
+      #{className}.class.methods.collect {
+      	arg m;
+      	(
+      		\\name: m.name,
+      		\\args: if(m.argNames.isNil, {[]}, {m.argNames[1..]}),
+      		\\argDefaults: if(m.prototypeFrame.isNil, {[]}, {m.prototypeFrame[1..]})
+      	)
+      }
+    })
+    """
+    return @repl.eval(code, true, null, false, false)
+
+  getClassVars: (className) ->
+    code = """
+    if(#{className}.classVarNames.isNil, {[]}, {
+      #{className}.classVarNames
+    })
+    """
+    return @repl.eval(code, true, null, false, false)
+
+  updateClassList: () ->
+    @repl.eval('Class.allClasses', true, null, false, false)
+      .then (result) =>
+        @classes = result
+    @repl.eval('SCDoc.documents.collect {arg doc; doc.summary}',
+               true, null, false, false)
+      .then (result) =>
+        @docs = result
+
+  getSuggestions: ({editor, bufferPosition}) =>
+     # Get the text for the line up to the triggered buffer position
+    line = editor.getTextInRange([[bufferPosition.row, 0], bufferPosition])
+    # this regex matches empty, so we should always get something
+    prefix = line.match(@prefixRegex)[0]
+    objs = prefix.split('.');
+    if objs.length == 1
+      return @handleNakedPrefix(objs[0])
+    else if objs.length == 2 && objs[0] in @classes
+      return @handleClassMemberPrefix(objs[0], objs[1])
+    else
+      return []
diff --git a/lib/controller.coffee b/lib/controller.coffee
index 897c341..7250263 100755
--- a/lib/controller.coffee
+++ b/lib/controller.coffee
@@ -17,6 +17,14 @@ class Controller
     @activeRepl = null
     @markers = []
     @scScope = 'source.supercollider'
+    @provider =
+      selector: '.source.supercollider'
+      inclusionPriority: 10
+      excludeLowerPriority: true
+      filterSuggestions: true
+      getSuggestions: (options) =>
+        @activeRepl.getSuggestions(options)
+
 
   start: ->
     atom.commands.add 'atom-workspace',
diff --git a/lib/repl.coffee b/lib/repl.coffee
index 518b1d5..1f59f07 100644
--- a/lib/repl.coffee
+++ b/lib/repl.coffee
@@ -1,4 +1,5 @@
 PostWindow = require('./post-window')
+AutoCompleter = require('./autocomplete')
 Bacon = require('baconjs')
 url = require('url')
 os = require('os')
@@ -23,6 +24,7 @@ class Repl
     @makeBus()
     @state = null
     @debug = atom.config.get 'supercollider.debug'
+    @autocompleter = new AutoCompleter(@)
     if @debug
       console.log 'Supercollider REPL [DEBUG=true]'
 
@@ -38,6 +40,9 @@ class Repl
 
     @postWindow = new PostWindow(@uri, @postBus, onClose)
 
+  getSuggestions: (options) ->
+    @autocompleter.getSuggestions(options)
+
   makeBus: ->
     @postBus = new Bacon.Bus()
     @controllerBus = new Bacon.Bus()
@@ -80,6 +85,7 @@ class Repl
       if @debug
         console.log 'booted'
       @ready.resolve()
+      @autocompleter.updateClassList()
 
     fail = (error) =>
       # dirs
@@ -198,12 +204,16 @@ class Repl
 
     return opts
 
-  eval: (expression, noecho=false, nowExecutingPath=null) ->
+  eval: (expression, noecho=false, nowExecutingPath=null,
+         returnString=true, printResult=true) ->
 
     deferred = Q.defer()
 
     ok = (result) =>
-      @postBus.push "<div class='pre out'>#{result}</div>"
+      if printResult
+        # we need to convert to string for printing if our output is a JSON object
+        printable = if returnString then result else JSON.stringify(result)
+        @postBus.push "<div class='pre out'>#{printable}</div>"
       deferred.resolve(result)
 
     err = (error) =>
@@ -223,7 +233,7 @@ class Repl
         @postBus.push "<div class='pre in'>#{echo}</div>"
 
       # expression path asString postErrors getBacktrace
-      @sclang.interpret(expression, nowExecutingPath, true, false, true)
+      @sclang.interpret(expression, nowExecutingPath, returnString, false, true)
         .then(ok, err)
 
     deferred.promise
diff --git a/lib/supercollider.coffee b/lib/supercollider.coffee
index 3fa94d3..611c36e 100644
--- a/lib/supercollider.coffee
+++ b/lib/supercollider.coffee
@@ -38,3 +38,6 @@ module.exports =
 
   serialize: ->
     {}
+
+  provide: () ->
+    @controller.provider
diff --git a/package.json b/package.json
index 5536f31..02a2916 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "atom-space-pen-views": "^2.2.0",
     "baconjs": "^0.7.89",
     "escape-html": "~1.0.3",
+    "fuzzaldrin-plus": "^0.5.0",
     "growl": "^1.9.2",
     "jquery": "^2",
     "moment": "^2.17.1",
@@ -31,5 +32,12 @@
       "supercollider:cmd-period",
       "supercollider:manage-quarks"
     ]
+  },
+  "providedServices": {
+    "autocomplete.provider": {
+      "versions": {
+        "2.0.0": "provide"
+      }
+    }
   }
 }