Add a rule for pacman

thefuck/rules/pacman.py

@@ -0,0 +1,42 @@
+import subprocess
+
+
+def __command_available(command):
+    try:
+        subprocess.check_output([command], stderr=subprocess.DEVNULL)
+        return True
+    except subprocess.CalledProcessError:
+        # command exists but is not happy to be called without any argument
+        return True
+    except FileNotFoundError:
+        return False
+
+
+def __get_pkgfile(command):
+    try:
+        return subprocess.check_output(
+            ['pkgfile', '-b', '-v', command.script.split(" ")[0]],
+            universal_newlines=True, stderr=subprocess.DEVNULL
+        ).split()
+    except subprocess.CalledProcessError:
+        return None
+
+
+def match(command, settings):
+    return 'not found' in command.stderr and __get_pkgfile(command)
+
+
+def get_new_command(command, settings):
+    package = __get_pkgfile(command)[0]
+
+    return '{} -S {} && {}'.format(pacman, package, command.script)
+
+
+if not __command_available('pkgfile'):
+    enabled_by_default = False
+elif __command_available('yaourt'):
+    pacman = 'yaourt'
+elif __command_available('pacman'):
+    pacman = 'sudo pacman'
+else:
+    enabled_by_default = False