add filter option to deps.unlock (#4932)

Signed-off-by: José Valim <jose.valim@plataformatec.com.br>

Author: mobileoverlord

lib/mix/lib/mix/tasks/deps.unlock.ex

@@ -16,7 +16,7 @@ defmodule Mix.Tasks.Deps.Unlock do
 
   """
 
-  @switches [all: :boolean, unused: :boolean]
+  @switches [all: :boolean, unused: :boolean, filter: :string]
 
   @spec run(OptionParser.argv) :: :ok
   def run(args) do
@@ -29,6 +29,27 @@ defmodule Mix.Tasks.Deps.Unlock do
       opts[:unused] ->
         apps = Mix.Dep.loaded([]) |> Enum.map(& &1.app)
         Mix.Dep.Lock.read() |> Map.take(apps) |> Mix.Dep.Lock.write()
+      filter = opts[:filter] ->
+        lock = Mix.Dep.Lock.read
+        apps = Map.keys(lock)
+
+        unlock =
+          apps
+          |> Enum.filter(&String.contains?("#{&1}", filter))
+
+        if unlock == [] do
+          Mix.shell.error "warning: no dependencies were matched"
+        else
+          lock =
+            Enum.reject(lock, fn({app, _}) ->
+              app in unlock
+            end)
+          Mix.Dep.Lock.write(lock)
+          Mix.shell.info """
+          Unlocked deps:
+          * #{Enum.join(unlock, "\n* ")}
+          """
+        end
 
       apps != [] ->
         lock =

lib/mix/test/mix/tasks/deps_test.exs

@@ -238,6 +238,21 @@ defmodule Mix.Tasks.DepsTest do
     end
   end
 
+  test "unlocks filtered deps", context do
+    Mix.Project.push DepsApp
+    in_tmp context.test, fn ->
+      Mix.Dep.Lock.write %{git_repo: "abcdef", another: "hash", another_one: "hash"}
+      Mix.Tasks.Deps.Unlock.run ["--filter", "another"]
+      assert Mix.Dep.Lock.read == %{git_repo: "abcdef"}
+      output = """
+      Unlocked deps:
+      * another
+      * another_one
+      """
+      assert_received {:mix_shell, :info, [^output]}
+    end
+  end
+
   ## Deps environment
 
   defmodule DepsEnvApp do