Reenable tasks without side-effects, that only run code (#7855)

Author: josevalim

lib/mix/lib/mix/tasks/do.ex

@@ -8,6 +8,8 @@ defmodule Mix.Tasks.Do do
 
   The comma should be followed by a space.
 
+  This task is automatically reenabled, so it can be called multiple times.
+
   ## Examples
 
   The example below prints the available compilers and
@@ -18,6 +20,7 @@ defmodule Mix.Tasks.Do do
   """
 
   def run(args) do
+    Mix.Task.reenable("do")
     Enum.each(gather_commands(args), fn [task | args] -> Mix.Task.run(task, args) end)
   end
 

lib/mix/lib/mix/tasks/profile.cprof.ex

@@ -21,6 +21,9 @@ defmodule Mix.Tasks.Profile.Cprof do
       mix profile.cprof -e "[1, 2, 3] |> Enum.reverse |> Enum.map(&Integer.to_string/1)"
       mix profile.cprof my_script.exs arg1 arg2 arg3
 
+  This task is automatically reenabled, so you can profile multiple times
+  in the same Mix invocation.
+
   ## Command line options
 
     * `--matching` - only profile calls matching the given `Module.function/arity` pattern
@@ -111,6 +114,7 @@ defmodule Mix.Tasks.Profile.Cprof do
 
   def run(args) do
     {opts, head} = OptionParser.parse_head!(args, aliases: @aliases, strict: @switches)
+    Mix.Task.reenable("profile.cprof")
 
     Mix.Tasks.Run.run(
       ["--no-mix-exs" | args],

lib/mix/lib/mix/tasks/profile.eprof.ex

@@ -21,6 +21,9 @@ defmodule Mix.Tasks.Profile.Eprof do
       mix profile.eprof -e "[1, 2, 3] |> Enum.reverse |> Enum.map(&Integer.to_string/1)"
       mix profile.eprof my_script.exs arg1 arg2 arg3
 
+  This task is automatically reenabled, so you can profile multiple times
+  in the same Mix invocation.
+
   ## Command line options
 
     * `--matching` - only profile calls matching the given `Module.function/arity` pattern
@@ -123,6 +126,7 @@ defmodule Mix.Tasks.Profile.Eprof do
 
   def run(args) do
     {opts, head} = OptionParser.parse_head!(args, aliases: @aliases, strict: @switches)
+    Mix.Task.reenable("profile.eprof")
 
     Mix.Tasks.Run.run(
       ["--no-mix-exs" | args],

lib/mix/lib/mix/tasks/profile.fprof.ex

@@ -19,6 +19,9 @@ defmodule Mix.Tasks.Profile.Fprof do
       mix profile.fprof -e Hello.world
       mix profile.fprof my_script.exs arg1 arg2 arg3
 
+  This task is automatically reenabled, so you can profile multiple times
+  in the same Mix invocation.
+
   ## Command line options
 
     * `--callers` - prints detailed information about immediate callers and called functions
@@ -127,6 +130,7 @@ defmodule Mix.Tasks.Profile.Fprof do
 
   def run(args) do
     {opts, head} = OptionParser.parse_head!(args, aliases: @aliases, strict: @switches)
+    Mix.Task.reenable("profile.fprof")
 
     Mix.Tasks.Run.run(
       ["--no-mix-exs" | args],

lib/mix/lib/mix/tasks/run.ex

@@ -40,11 +40,14 @@ defmodule Mix.Tasks.Run do
 
       elixir --sname hello -S mix run --no-halt
 
+  This task is automatically reenabled, so it can be called multiple times
+  with different arguments.
+
   ## Command-line options
 
     * `--config`, `-c`  - loads the given configuration file
     * `--eval`, `-e` - evaluates the given code
-    * `--require`, `-r` - requires pattern before running the command
+    * `--require`, `-r` - executes the given pattern/file
     * `--parallel`, `-p` - makes all requires parallel
     * `--preload-modules` - preloads all modules defined in applications
     * `--no-compile` - does not compile even if files require compilation
@@ -81,6 +84,7 @@ defmodule Mix.Tasks.Run do
 
     run(args, opts, head, &Code.eval_string/1, &Code.require_file/1)
     unless Keyword.get(opts, :halt, true), do: Process.sleep(:infinity)
+    Mix.Task.reenable("run")
     :ok
   end