feature #26372 Revert "feature #24763 [Process] Allow writing portabl…

…e "prepared" command lines (Simperfit)" (nicolas-grekas)

This PR was merged into the 4.1-dev branch.

Discussion
----------

Revert "feature #24763 [Process] Allow writing portable "prepared" command lines (Simperfit)"

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

This reverts commit 1364089, reversing
changes made to e043478.

As discussed in #24763 and #26344

This doens't revert the possibility to use prepared command lines. They just won't be *portable* anymore, unless special care is taken by "userland".
Ie the placeholders need to be shell-dependent: use eg `echo "$FOO"` on *nix (the double quotes *are* important), and `echo !FOO!` on Windows (no double quotes there).

Commits
-------

6a98bfa Revert "feature #24763 [Process] Allow writing portable "prepared" command lines (Simperfit)"

src/Symfony/Component/Process/Process.php

@@ -258,21 +258,18 @@ public function start(callable $callback = null, array $env = array())
         $this->hasCallback = null !== $callback;
         $descriptors = $this->getDescriptors();
 
-        if ($this->env) {
-            $env += $this->env;
-        }
-
         if (is_array($commandline = $this->commandline)) {
             $commandline = implode(' ', array_map(array($this, 'escapeArgument'), $commandline));
 
             if ('\\' !== DIRECTORY_SEPARATOR) {
                 // exec is mandatory to deal with sending a signal to the process
                 $commandline = 'exec '.$commandline;
             }
-        } else {
-            $commandline = $this->replacePlaceholders($commandline, $env);
         }
 
+        if ($this->env) {
+            $env += $this->env;
+        }
         $env += $this->getDefaultEnv();
 
         $options = array('suppress_errors' => true);
@@ -1552,29 +1549,6 @@ private function escapeArgument(string $argument): string
         return '"'.str_replace(array('"', '^', '%', '!', "\n"), array('""', '"^^"', '"^%"', '"^!"', '!LF!'), $argument).'"';
     }
 
-    private function replacePlaceholders(string $commandline, array $env)
-    {
-        $pattern = '\\' === DIRECTORY_SEPARATOR ? '!%s!' : '"$%s"';
-
-        return preg_replace_callback('/\{\{ ?([_a-zA-Z0-9]++) ?\}\}/', function ($m) use ($pattern, $commandline, $env) {
-            if (!isset($env[$m[1]]) || false === $env[$m[1]]) {
-                foreach ($env as $k => $v) {
-                    if (false === $v) {
-                        unset($env[$k]);
-                    }
-                }
-                if (!$env) {
-                    throw new InvalidArgumentException(sprintf('Invalid command line "%s": no values provided for any placeholders.', $commandline));
-                }
-                $env = implode('", "', array_keys($env));
-
-                throw new InvalidArgumentException(sprintf('Invalid command line "%s": no value provided for placeholder "%s", did you mean "%s"?', $commandline, $m[1], $env));
-            }
-
-            return sprintf($pattern, $m[1]);
-        }, $commandline);
-    }
-
     private function getDefaultEnv()
     {
         $env = array();

src/Symfony/Component/Process/Tests/ProcessTest.php

@@ -1474,34 +1474,6 @@ public function provideEscapeArgument()
         yield array('éÉèÈàÀöä');
     }
 
-    public function testPreparedCommand()
-    {
-        $p = new Process(self::$phpBin.' -r \'print_r($argv);\' {{ abc }}DEF');
-        $p->run(null, array('abc' => 'A" B "C'));
-
-        $this->assertContains('A" B "CDEF', $p->getOutput());
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Process\Exception\InvalidArgumentException
-     * @expectedExceptionMessage Invalid command line "echo {{ abc }}": no value provided for placeholder "abc", did you mean "bcd"?
-     */
-    public function testPreparedCommandWithMissingValue()
-    {
-        $p = new Process('echo {{ abc }}');
-        $p->run(null, array('bcd' => 'BCD'));
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Process\Exception\InvalidArgumentException
-     * @expectedExceptionMessage Invalid command line "echo {{ abc }}": no values provided for any placeholders.
-     */
-    public function testPreparedCommandWithNoValues()
-    {
-        $p = new Process('echo {{ abc }}');
-        $p->run();
-    }
-
     public function testEnvArgument()
     {
         $env = array('FOO' => 'Foo', 'BAR' => 'Bar');