add nushell support

thefuck/shells/__init__.py

@@ -10,14 +10,16 @@
 from .tcsh import Tcsh
 from .zsh import Zsh
 from .powershell import Powershell
+from .nushell import Nushell
 
 shells = {'bash': Bash,
           'fish': Fish,
           'zsh': Zsh,
           'csh': Tcsh,
           'tcsh': Tcsh,
           'powershell': Powershell,
-          'pwsh': Powershell}
+          'pwsh': Powershell,
+          'nu': Nushell}
 
 
 def _get_shell_from_env():

thefuck/shells/nushell.py

@@ -0,0 +1,72 @@
+from subprocess import Popen, PIPE
+import os
+import six
+import sys
+from .. import logs
+from ..utils import DEVNULL
+from .generic import Generic
+
+
+class Nushell(Generic):
+    friendly_name = 'Nushell Shell'
+
+    def get_aliases(self):
+        aliases = {}
+        command = 'help aliases | select name expansion | each { |row| $row.name + " ; " + $row.expansion } | str join (char nl)'
+        proc = Popen(['nu', '-l', '-c', command], stdout=PIPE, stderr=DEVNULL)
+        if proc.stdout is None:
+            return aliases
+        alias_out = proc.stdout.read().decode('utf-8').strip()
+        for alias in alias_out.split('\n'):
+            split_alias = alias.split(" ; ")
+            if len(split_alias) == 2:
+                name, value = split_alias
+                aliases[name] = value
+        return aliases
+
+    def app_alias(self, alias_name):
+        return 'alias {0} = thefuck $"(history | last 1 | get command | get 0)"'.format(alias_name)
+
+    def _get_history_file_name(self):
+        return os.path.expanduser('~/.config/nushell/history.txt')
+
+    def _get_history_line(self, command_script):
+        return command_script
+
+    def and_(self, *commands):
+        return u' and '.join(commands)
+
+    def or_(self, *commands):
+        return u' or '.join(commands)
+
+    def how_to_configure(self):
+        return self._create_shell_configuration(
+            content='alias fuck = thefuck $"(history | last 1 | get command | get 0)"',
+            path="$nu.config-path",
+            reload="source $nu.config-path"
+        )
+
+    def _script_from_history(self, line):
+        return line
+
+    def put_to_history(self, command):
+        """Adds fixed command to shell history."""
+        try:
+            history_file_name = self._get_history_file_name()
+            if os.path.isfile(history_file_name):
+                with open(history_file_name, 'a') as history:
+                    entry = self._get_history_line(command)
+                    if six.PY2:
+                        history.write(entry.encode('utf-8'))
+                    else:
+                        history.write(entry)
+        except IOError:
+            logs.exception("Can't update history", sys.exc_info())
+
+    def _get_version(self):
+        """Returns the version of the current shell"""
+        proc = Popen(['nu', '--version'], stdout=PIPE, stderr=DEVNULL)
+        if proc.stdout:
+            return proc.stdout.read().decode('utf-8')
+        else: 
+            raise Exception("Could not get the version of the current shell")