Changed:

• Error message improved for sourcing foreign shells, when file cannot be found
  or there is a syntax error.

Fixed:

• Fixed issues with readline completer tab completing entries
  with spaces.
• Fixed xonsh.tools.columnize() bug the prevented single-row
  input from being columnized correctly.
• Now honor ASYNC and AWAIT as keywords in tokenizer on
  Python 3.7.

Added:

• Docs for using @(<expr>) as a way to run commands and a gotcha about
  list of strings vs single string expressions.
• Ubuntu versions which xonsh is packaged for (with xonsh versions)

Changed:

• When reporting errors without a traceback (i.e. $XONSH_SHOW_TRACEBACK = False) and the error is a XonshError
  the exception type is not longer printed.
• CommandPipeline.proc may now be None, to accomodate when the process
  fails to even start (i.e. a missing command or incorrect permisions).

Fixed:

• The curl command will now be run in a thread, which prevents documents that
  do not end in a newline from writing over the next prompt and vice versa.
• Fix bug on Windows when PATHEXT environment variable did not exist.
  This also fixes building the xonsh documentation on Windows.
• Fixed a bug in the free_cwd <http://xon.sh/xontribs.html#free-cwd>__ Windows Xontrib, which caused the prompt to error if the current directory is
  deleted/renamed from an other process.
• Fixed issue with $XONSH_SHOW_TRACEBACK not being respected in subprocess
  mode when the command could not be found or had incorrect permissions.

Added:

• Release tarballs now include licenses and minimal documentation for xonsh and ply
• Wizard now has a FileInserter node that allows blocks to be
  inserted and replaced inside of a file. This adheres to conversion
  rules fordumping as provided on this node.
• New xonsh.wizard.StateVisitor.flatten() method for flattening the
  current state.

Changed:

• The xonsh startup wizard will only be triggered if no xonshrc files exist
  and the file ~/.local/config/xonsh/no-wizard is not present.
• The xonfig wizard command will now run write out to the xonshrc file.
• Wizard nodes Save and Load had their names changed to SaveJSON
  and LoadJSON.

Removed:

• Static configuration is dead (config.json), long live run control (xonshrc)!
• The following evironment variables have been removed as they are no longer needed:
  $LOADED_CONFIG and $XONSHCONFIG.
• Many support functions for static configuration have also been removed.

Fixed:

• Files starting with # are auto-escaped by TAB completion

Added:

• Support for MSYS2.
• New xonsh.main.setup() function for starting up xonsh in 3rd party
  packages.

Changed:

• Updated CircleCI to use circle version 2.0
• Replaced StopIteration with return in CommandPipeline.iterraw.
• Xonsh run control now also looks for the XDG-compliant file
  ~/.config/xonsh/rc.xsh at startup.

Fixed:

• Clean out $LINES and $COLUMNS if set, preventing some programs from drawing weirdly
• cat from xoreutils now outputs in configured encoding
• Fixed hanging issue with pipelines whose middle processes exit before the
  first or last process.
• Fixed issue where xonsh would deduplicate spaces from bash autocompletions.
• Fixed failing redirections from stderr to stdout when the command
  being executed was a callable alias.
• Ensure that the free_cwd contrib can only be active on pure Windows.
• Made an exceptional case in iglobpath() more robust when Python globbing
  fails for due to strange scrandir issue.
• Unexpected process suspension on Cygwin and MSYS2.
• $XONSH_APPEND_NEWLINE will now default to True when in interactive mode.
• Fixed issue with uncalled lambdas being run in subproc mode.
• Lambda nodes not have proper line and column numbers in AST.
• Properly throw SyntaxError when no kwargs are defined
  in a kwarg-only function. This used to throw a
  TypeError: 'NoneType' object is not iterable.
• Addressed issue where encoding and errors were None when teeing output.
• Commands like git c would complete to git 'checkout ' because git adds an extra space
  to the end of the completion, which was being captured in the completion. Xonsh now fixes the git issue
  while retaining all whitespace when there is other internal whitespace.

Added:

• Added an alias command, matching bash's implementation, available as part of bashisms.

• New $AUTO_SUGGEST_IN_COMPLETIONS environment variable that enables/disables
  whether the auto-suggestion result appears in the tab completions.

• Added __add__() and __radd__() methods to EnvPath.

• Xonsh now supports f-strings, as in Python v3.6+.

• Added ipython as unthreadable in command cache threadabilty predictors.

• Added whole_word_jumping xontrib

• Added $XONSH_APPEND_NEWLINE environment variable

• Support for PEP 515: Underscores in Numeric Literals

• xonsh.color_tools.make_palette()

  Simple rename of the pre-existing
  xonsh.color_tools.make_pallete() function.

• xonsh.tools.decorator() function/method decorator.

  This allows for an API function to be annotated with a
  decorator that documents deprecation, while also tying in
  functionality that will warn a user that the function has
  been deprecated, and, raise an AssertionError if the
  function has passed its expiry date.

• New xontrib schedule (Xonsh Task Scheduler)

Changed:

• on_pre_prompt is now fired before prompt calculations are made, allowing modifications to the prompt.
• emacsclient will now return false in the threadable predictors.
• Improved the autopair behavior to match that of popular code editors.
• Moved the lazy pkg_resources package back to its original
  place. The will hopefully address some of the slowdown issues
  experiances on some platforms.
• When xonsh is used to run an xsh script, the xonshrc is not loaded
• Change in the behavior of the default predictor with binary analysis. The pattern libgpm is use, assuming when gpm is used the program is not threadable. This change solves issues with programs as links.
• Error messages added to the source command if it is used with a language
  that is not xonsh or Python.

Deprecated:

• xonsh.color_tools.make_pallette()

  Deprecated in release 0.5.10 and will be removed in release 0.6.0.

Fixed:

• Now f-strings can be used inside @() without explicit enclosing command in ![]

• Fix for x, y, *z = ... unpacking.

• Git branch detection now correctly passes the environment down to the subprocess
  call. This allows for branch detection when git is installed into a non-standard
  location.

• Escape regex characters in path_complete to avoid regex parsing errors for
  certain combinations of characters in path completer

• gistatus: Fixed hash not being shown when in detaced HEAD and there are no tags

• Fix branch colorization when git or hg are aliases.

• Fixed leftover .git/index.lock in gitstatus

• Made JSON history loading more robust to corrupt files.

• Starting a new command with an open parentheses will no longer
  throw a traceback when $UPDATE_COMPLETIONS_ON_KEYPRESS is
  True.

• Automatically wrapping subprocess calls would sometimes include
  semincolons and other line-ending tokens, rather than stopping at them.
  This has been fixed.

• Numerous spelling errors in documentation, docstrings/comments, text
  strings and local variable names.

• Spelling error in the xonsh.color_tools.make_pallete() public
  function declaration. This was fixed by renaming the function to
  xonsh.color_tools.make_palette() while maintaining a binding
  of make_pallete() to the new make_palette() in case users
  are already used to this API.

• Fixed issue with starting triple quote strings being run as a command.

• Fixed a problem with escaping charet (^) character for cmd.exe in the source-cmd function.

• EOF in multi-line statement errors were misreported as being on line 0.
  Now they are correctly reported as being on the last line of the file.

Fixed:

• Fixed release.xsh to prevent it from dirtying the repo on release and
  leading to an unwanted .dev suffix on the version number

Added:

• release.xsh creates a github release with the merged news entries as the
  release body

Fixed:

• xonfig now displays the proper value for "on linux"

v0.5.9

Added:

• Add Alt . keybinding to bashisms-xontrib to insert last argument of
  previous command into current buffer

Fixed:

• Fix crash when openSSH version of bash is on PATH on Windows.

• Added missing ensurers to make sure that bool env_vars are bools and
  int env_vars are integers:

  • DIRSTACK_SIZE
  • EXPAND_ENV_VARS
  • PUSHD_MINUS
  • PUSHD_SILENT
  • SUGGEST_COMMANDS
  • SUGGEST_MAX_NUM
  • SUGGEST_THRESHOLD

Added:

• Tab completion xontrib for python applications based on click framework.
• Added on_transform_command event for pre-processing that macros can't handle.
• Autodetection of backgroundability by binary analysis on POSIX.
• New argument expand_user=True to tools.expand_path.
• New $COMPLETION_QUERY_LIMIT environment variable for setting the
  number of completions above which the user will be asked if they wish to
  see the potential completions.
• Users may now redirect stdout to stderr in subprocess mode.

Changed:

• The Block and Functor context managers from xonsh.contexts have been
  rewritten to use xonsh's macro capabilities. You must now enter these via the
  with! statement, e.g. with! Block(): pass.
• The distributed xontrib now needs to use the with! statement, since it
  relies on Functor.
• telnet has been flagged as unthreadable.
• When $DYNAMIC_CWD_ELISION_CHAR is non empty and the last dir of cwd is too
  long and shortened, the elision char is added at the end.
• pygments is no longer a strict dependency of the prompt_toolkit
  backend. If pygments is not installed, the PTK backend will use the
  default ansi color settings from the terminal. Syntax highlighting requires
  that pygments is installed.
• Events are now keyword arguments only
• Restored on_precommand to its original signature.
• Move built_ins.expand_path to tools.expand_path.
• Rename tools.expandpath to tools._expandpath.
• Added gvim command to unthreadable predictors.
• The source alias now passes $ARGS down to file it is sourcing.

Removed:

• XonshBlockError has been removed, since it no longer serves a purpose.

Fixed:

• PopenThread will now re-issue SIGINT to the main thread when it is
  recieved.
• Fixed an issue that using sqlite history backend does not kill unfinished
  jobs when quitting xonsh with a second "exit".
• Fixed an issue that xonsh would fail over to external shells when
  running .xsh script which raises exceptions.
• Fixed an issue with openpty() returning non-unix line endings in its buffer.
  This was causing git and ssh to fail when xonsh was used as the login shell on the
  server. See https://mail.python.org/pipermail/python-list/2013-June/650460.html for
  more details.
• Restored the ability to ^Z and fg processes on posix platforms.
• CommandPipelines were not gauranteeded to have been ended when the return code
  was requested. This has been fixed.
• Introduce path expansion in is_writable_file to fix
  $XONSH_TRACEBACK_LOGFILE=~/xonsh.log.
• Backgrounding a running process (^Z) now restores ECHO mode to the terminal
  in cases where the subprocess doesn't properly restore itself. A major instance
  of this behaviour is Python's interactive interpreter.
• Readline backend would not ask the user to confirm the printing of completion
  options if they numbered above a certain value. Instead they would be dumped to
  the screen. This has been fixed.
• Jupyter kernel was no longer properly running subprocess commands.
  This has been fixed.
• The filename is applied to the target of the source alias, providing better
  tracebacks.

Added:

• Add alias xip ("kip") so that xonsh's Python environment (whatever that is) can be modified.
• HistoryEntry, a SimpleNamespace object that represents a command in history.
• xonsh.completers.bash_completion module
• Added option to report timing information of xonsh startup times. Start xonsh
  with the --timings flag to use the feature.
• The Python tab completer will now complete the argument names of functions
  and other callables.
• Uptime module added to xonsh.xoreutils. This can report the system
  boot time and up time.
• The environment variable XONSH_HISTORY_BACKEND now also supports a
  value of class type or a History Backend instance.
• on_envvar_new event that fires after a new envvar is created.
• on_envvar_change event that fires after an envvar is changed.

Changed:

• history indexing api to be more simple, now returns HistoryEntry.
• Decoupled bash_completion from xonsh project and added shim back to
  xonsh.
• The JSON history backend will now unlock history files that were created
  prior to the last reboot.

Fixed:

• Fixed broken bash completions on Windows if 'Windows Subsystem for Linux' is installed.
• Readline history would try to read the first element of history prior to
  actually loading any history. This caused an exception to be raised on
  Windows at xonsh startup when using pyreadline.
• Fixed issue with readline tab completer overwriting initial prefix in
  some instances.
• Fixed issue wherein if git or (presumably) hg are aliased, then branch
  information no longer appears in the $PROMPT
• Fixed an issue with commands that background themselves (such as
  gpg-connect-agent) not being able to be run from within xonshrc.

Added:

• New --rc command line option allows users to specify paths to run control
  files from the command line. This includes both xonsh-based and JSON-based
  configuration.
• New $UPDATE_COMPLETIONS_ON_KEYPRESS controls whether or not completions
  will automatically display and update while typing. This feature is only
  available in the prompt-toolkit shell.

Changed:

• Xonsh scripts now report __file__ and __name__ when run as scripts
  or sourced. These variables have the same meaning as they do in Python
  scripts.
• $XONSHRC and related configuration variables now accept JSON-based
  static configuration file names as elements. This unifies the two methods
  of run control to a single entry point and loading system.
• The xonsh.shell.Shell() class now requires that an Execer instance
  be explicitly provided to its init method. This class is no longer
  responsible for creating an execer an its deprendencies.
• Moved decorators unthreadable, uncapturable from
  xonsh.proc to xonsh.tools.
• Some refactorings on jobs control.

Deprecated:

• The --config-path command line option is now deprecated in favor of
  --rc.

Removed:

• xonsh.environ.DEFAULT_XONSHRC has been removed due to deprecation.
  For this value, please check the environment instead, or call
  xonsh.environ.default_xonshrc(env).

Fixed:

• Command pipelines that end in a callable alias are now interruptable with
  ^C and the processes that are piped into the alais have their file handles
  closed. This should ensure that the entire pipeline is closed.
• Fixed issue where unthreadable subprocs were not allowed to be
  captured with the $(cmd) operator.
• The ProcProxy class (unthreadable aliases) was not being executed and would
  hange if the alias was capturable. This has been fixed.
• Fixed a tcsetattr: Interrupted system call issue when run xonsh scripts.
• Fixed issue with ValueError being thrown from inspect.signature()
  when called on C-extention callables in tab completer.
• Fixed issue that ls | less crashes on Mac.
• Threadable prediction was incorrectly based on the user input command, rather than
  the version where aliases have been resolved. This has been corrected.

Added:

• New core utility function aliases (written in pure Python) are now
  available in xonsh.xoreutils. These include: cat, echo,
  pwd, tee, tty, and yes. These are not enabled by default.
  Use the new coreutils xontrib to load them.

• CircleCI test post codecov run

• The trace will automatically disable color printing when
  stdout is not a TTY or stdout is captured.

• New jedi xontrib enables jedi-based tab completions when it is loaded.
  This supercedes xonsh's default Python-mode completer.

• The lexer has a new split() method which splits strings
  according to xonsh's rules for whitespace and quotes.

• New events for hooking into the Python import process are now available.
  You can now provide a handler for:

  • on_import_pre_find_spec
  • on_import_post_find_spec
  • on_import_pre_create_module
  • on_import_post_create_module
  • on_import_pre_exec_module
  • on_import_post_exec_module

Changed:

• The prompt toolkit shell's first completion will now be the
  current token from the auto-suggetion, if available.
• Sourcing foreign shells will now safely skip applying aliases
  with the same name as existing xonsh aliases by default.
  This prevents accitidentally overwriting important xonsh standard
  aliases, such as cd.

Fixed:

• Threadable predicition for subprocesses will now consult both the command
  as it was typed in and any resolved aliases.
• The first prompt will no longer print in the middle of the line if the user has
  already started typing.
• Windows consoles will now automatically enable virtual terminal processing
  with the readline shell, if available. This allows the full use of ANSI
  escape sequences.
• On the Windows readline shell, the teb-completion supression prompt will no
  longer error out depending on what you press.
• Fixed issue with subprocess mode wrapping not repecting line continuation
  backslashes.
• Handle a bug where Bash On Windows causes platform.windows_bash_command()
  to raise CalledProcessError.
• Fixed issues pertaining to completing from raw string paths.
  This is particularly relevant to Windows, where raw strings
  are instered in path completion.
• Replace deprecated calls to time.clock() by calls to
  time.perf_counter().
• Use clock() to set the start time of _timings in non-windows instead
  of manually setting it to 0.0.
• The trace utility will now correctly color output and not
  print extraneous newlines when called in a script.
• The @$(cmd) operator now correctly splits strings according to
  xonsh semantics, rather than just on whitespace using str.split().
• The mpl xontrib has been updated to improve matplotlib
  handling. If xontrib load mpl is run before matplotlib
  is imported and xonsh is in ineteractive mode, matplotlib
  will automatically enter interactive mode as well. Additionally,
  pyplot.show() is patched in interactive mode to be non-blocking.
  If a non-blocking show fails to draw the figre for some reason,
  a regular blocking version is called.
• Fixed issues like timeit ls causing OSError - "Inappropriate ioctl
  for device".
• Fixed a potential "OSError: [Errno 22] Invalid argument" to increase job
  control stability.

Added:

• New color_tools module provides basic color tools for converting
  to and from various formats as well as creating pallettes from color
  strings.
• Redirections may now be used in string and list-of-strings
  aliases.
• Subprocess redirection may now forego the whitespace between the
  redirection and a file name. For example,
  echo hello world >/dev/null.
• Add a -P flag to the cd function in order to change directory and
  following symlinks.
• xonfig tutorial command to launch the http://xon.sh/tutorial in the
  browser.
• @(...) syntax now supports generators and tuples without parentheses.
• Sourcing foreign shells now have the --show option, which
  lets you see when script will be run, and the --dryrun
  option which prevents the source from actually taking place.
  Xonsh's foreign shell API also added these keyword arguments.
• Subprocess mode now supports subshells. Place any xonsh
  code between two parentheses, e.g. (cmd), to run
  this command in a separate xonsh subprocess.
• Foreign shell aliases now have the ability to take extra arguments,
  if needed.
• Xonsh will issue a warning message when the current working
  directory has been remove out from under it and not replaced
  prior to running the next command.
• Line continuation backslashes are respected on Windows in the PTK shell if
  the backspace is is preceded by a space.
• Added ponysay as a command which will ususally not run in a
  threaded mode in the commands cache.
• New jsonutils module available for serializing special
  xonsh objects to JSON.

Changed:

• The literal tokens and and or must be surrounded by
  whitespace to delimit subprocess mode. If they do not have
  whitespace on both sides in subproc mode, they are condisered
  to be part of a command argument.
• The xontrib command is now flagged as unthreadable and will be
  run on the main Python thread. This allows xontribs to set signal
  handlers and other operations that require the main thread.
• nvim (Neovim) has been flagged as unthreadable
• The interactive prompt will now catch SystemExit and, instead
  of exiting the session, will refresh the prompt. This is the same
  process as for keyboard interrupts.
• Xonsh no longer launches the wizard for new users. Instead a welcome screen is
  shown which says how to launch the wizard.
• Added Windows expanduser()-like function which prevents
  the expansion of ~ that are not followed by a path
  separator.
• Collecting xonsh history files was reported to have random runtime
  OSError failures. This exception is now handled, just in case. The
  The exception will still be printed in debug mode.
• Shell.stype has been renamed to Shell.shell_type.
• The configuration wizard now displays the proper control sequence to leave
  the wizard at the to start of the wizard itself. Note that this is Ctrl+D for
  readline and Ctrl+C for prompt-toolkit.
• Callable alias proxy functions are now more friendly to
  functools.partial().
• prompt.vc.get_hg_branch now uses os.scandir to walk up the filetree
  looking for a .hg directory. This results in (generally) faster branch
  resolution compared to the subprocess call to hg root.
• Xonsh's script and code caches will are now invalidated whenever the
  xonsh version changes for a given Python version.
• Autowrapping of subprocess globs has been improved to cover
  more cases that are ambiguous with Python syntax.
• Job control info when foregrounding or backgrounding jobs will now
  only be displayed when xonsh is in interactive mode.
• Enabled virtual terminal processing in the prompt-toolkit shell for Windows.

Fixed:

• 3rd party pygments styles (like solorized or monokailight) are now
  able to be used in xonsh. These styles are dynamically created upon
  first use, rather than being lazily loaded by xonsh.
• On Windows, os.environ is case insensitive. This would potentially
  change the case of envrionment variables set into the environment.
  Xonsh now uses nt.envrion, the case sensitive counterpart, to avoid
  these issues on Windows.
• Fix how $PWD is managed in order to work with symlinks gracefully
• history replay no longer barfs on style_name when setting up the
  environment
• Shell.shell_type is now properly set to the same value as $SHELL_TYPE.
• Fixed source-zsh to work with zsh v5.2.
• Fixed issue where del (x, y) would raise a syntax error.
• Certain vim commands issue commands involving subshells,
  and this is now supported.
• Null bytes handed to Popen are now automatically escaped prior
  to running a subprocess. This preevents Popen from issuing
  embedded null byte exceptions.
• Xonsh will no longer crash is the current working directory is
  removed out from under it.
• Multiline strings can now be written in subprocess mode.
• PTK completions will now correctly deduplicate autosuggest completions
  and display completions values based on the cursor position.
• Fixed bug where trailing backspaces on Windows paths could be interpreted
  as line continuations characters. Now line continuation characters must be
  preceded by a space on Windows. This only applies to xonsh in interactive
  mode to ensure scripts are portable.
• Importing *.xsh files will now respect the encoding listed in
  that file and properly fallback to UTF-8. This beahviour follows
  the rules described in PEP 263.
• Wizard is now able to properly serialize envrionment paths.

Changed:

• The xonsh.platform.os_environ wrapper is now case-insesitive and
  case-preserving on Windows.
• The private _TeeStd class will no longer attempt to write to a
  standard buffer after the tee has been 'closed' and the standard
  buffer returned to the system.

Fixed:

• Fixed a bug on py34 where os.scandir was used by accident.
• Line continuations (\\) is subproc mode will no longer consume the
  surrounding whitespace.
• Fixed a bug if foreign_shell name was not written in lower case in
  the static configuration file config.json
• Fixed a regression on Windows where caused which reported that the
  PATH envrionment variable could not be found.
• Fixed issue with foregrounding jobs that were started in the background.
• Fixed that Ctrl-C crashes xonsh after running an invalid command.
• Fixed an potential ProcessLookupError issue, see #2288.

Added:

• New option COMPLETIONS_CONFIRM. When set, <Enter> is used to confirm completion instead of running command while completion menu is displayed.
• NetBSD is now supported.
• Macro function calls are now available. These use a Rust-like f!(arg) syntax.
• Macro subprocess call now avalaible with the echo! x y z syntax.
• A new event subsystem has been added.
• howto install sections for Debian/Ubuntu and Fedora.
• History methods __iter__ and __getitem__
• tools.get_portions that yields parts of an iterable
• Added a py.test plugin to collect test_*.xsh files and run test_*() functions.
• __repr__ and __str__ magic method on LazyObject

Changed:

• create_module implementation on XonshImportHook
• Results of the bash tab completer are now properly escaped (quoted) when necessary.
• Foreign aliases that match xonsh builtin aliases are now ignored with a warning.
• prompt_toolkit completions now only show the rightmost portion of a given completion in the dropdown
• The value of 'none' is no longer allowed for $SHELL_TYPE just during the initial load from the environment. -D, later times, and other sources still work.
• yacc_debug=True now load the parser on the same thread that the Parser instance is created. setup.py now uses this synchronous form as it was causing the parser table to be missed by some package managers.
• Tilde expansion for the home directory now has the same semantics as Bash. Previously it only matched leading tildes.
• Context sensitive AST transformation now checks that all names in an expression are in scope. If they are, then Python mode is retained. However, if even one is missing, subprocess wrapping is attempted. Previously, only the left-most name was examined for being within scope.
• dirstack.pushd and dirstack.popd now handle UNC paths (of form \\<server>\<share>\...), but only on Windows. They emulate behavior of CMD.EXE by creating a temporary mapped drive letter (starting from z: down) to replace the \\<server>\<share> portion of the path, on the pushd and unmapping the drive letter when all references to it are popped.
• And dirstack suppresses this temporary drive mapping funky jive if registry entry HKCU\software\microsoft\command processor\DisableUNCCheck (or HKLM...) is a DWORD value 1. This allows Xonsh to show the actual UNC path in your prompt string and also allows subprocess commands invoking CMD.EXE to run in the expected working directory. See https://support.microsoft.com/en-us/kb/156276 to satisfy any lingering curiosity.
• lazy_locate_binary handles binary on different drive letter than current working directory (on Windows).
• _curr_session_parser now iterates over History
• New implementation of bash completer with better performanc
• $COMPLETIONS_BRACKETS is now available to determine whether or not to include opening brackets in Python completions
• xonsh.bat tries to use pylauncher when available.

Removed:

• History method show
• _hist_get_portion in favor of tools.get_portions
• Unused imports in proc, flake8.

Fixed:

• xonsh modules imported now have the file attribute
• Context senstitive AST transformer was not adding argument names to the local scope. This would then enable extraneous subprocess mode wrapping for expressions whose leftmost name was function argument. This has been fixed by properly adding the argument names to the scope.
• Foreign shell functions that are mapped to empty filenames no longer receive alaises since they can’t be found to source later.
• Correctly preserve arguments given to xon.sh, in case there are quoted ones.
• Environment variables in subprocess mode were not being expanded unless they were in a sting. They are now expanded properly.
• Fixed a bug that prevented xonsh from running scripts with code caching disabled.
• Text of instructions to download missing program now does not get off and appears in whole.
• Fix some test problems when win_unicode_console was installed on windows.
• Fixed bug that prompt string and $PWD failed to track change in actual working directory if the invoked Python function happened to change it (e.g via os.chdir()`. Fix is to update $PWD` after each command in BaseShell.default()``.
• The interactive prompt now correctly handles multiline strings.
• cd \\<server>\<share> now works when $AUTO_PUSHD is set, either creating a temporary mapped drive or simply setting UNC working directory based on registry DisableUNCCheck. However, if $AUTO_PUSHD is not set and UNC checking is enabled (default for Windows), it issues an error message and fails. This improves on prior behavior, which would fail to change the current working directory, but would set $PWD and prompt string to the UNC path, creating false expectations.
• fix parsing for tuple of tuples (like (),())
• sys.stdin, sys.stdout, sys.stderr no longer complete with opening square brackets
• xonsh now properly handles syntax error messages arising from using values in inappropriate contexts (e.g., del 7).

Added:

• Define alias for 'echo' on startup for Windows only.
• New coredev astronouth7303 added
• which -a now searches in __xonsh_ctx__ too
• Info about the xontrib cookiecutter template on xontrib tutorial
• xonsh's optional dependencies may now be installed with the pip extras ptk, proctitle, linux, mac, and win.
• Env help method to format and print the vardocs for an envvar
• test_news fails if no empty line before a category
• more info on test_news failures
• Added on_precommand and on_postcommand events
• New FORMATTER_DICT entry gitstatus to provides informative git status
• FOREIGN_ALIASES_OVERRIDE envvar to control whether foreign aliases should
  override xonsh aliases with the same name.
• Warning on tutorial about foreign aliases being ignored if a xonsh alias
  exist with the same name if not FOREIGN_ALIASES_OVERRIDE.
• The prompt-toolkit shell now auto-inserts matching parentheses, brackets, and quotes. Enabled via the $XONSH_AUTOPAIR environment variable
• Better syntax highlights in prompt-toolkit, including valid command / path highlighting, macro syntax highlighting, and more
• More info on tutorial about history interaction
• Entry on bash_to_xsh
• Macro context managers are now available via the with!
  syntax.

Changed:

• Devguide reflects the current process of releasing through release.xsh
• moved which from xonsh.aliases into xoreutils.which
• xonsh.prompt.gitstatus.gitstatus now returns a namedtuple
• implementation of xonsh.prompt.vc_branch.get_git_branch and
  xonsh.prompt.vc_branch.git_dirty_working_directory to use 'git status --procelain'
• moved prompt formatting specific functions from xonsh.environ
  to xonsh.prompt.base
• All prompt formatter functions moved to xonsh.prompt subpackage
• Printing the message about foreign aliases being ingored happens only
  if XONSH_DEBUG is set.
• Use SetConsoleTitleW() on Windows instead of a process call.
• Tutorial to reflect the current history command argument functionality
• Macro function arguments now default to str, rather than eval,
  for consistentcy with other parts of the macro system.

Removed:

• aliases that use '!' in their name cause they clash with the macro syntax

Fixed:

• Fix regression where bash git completions where not loaded
  automatically when GitForWindows is installed.
• More tokens are now supported in subproc args, such as ==.
• Python completions now work without space delimiters, e.g. a=matpl<TAB>
  will complete to a=matplotlib
• Parser would fail on nested, captured suprocess macros. Now, it works,
  hooray!?
• now fires chdir event if OS change in working directory is detected.
• xonsh.prompt.vc_branch.git_dirty_working_directory
  uses porcelain option instead of using the bytestring
  nothing to commit to find out if a git directory is dirty
• Fix bug where know commands where not highlighed on windows.
• Fixed completer showing executable in upper case on windows.
• Fixed issue where tilde expansion was occuring more than once before an
  equals sign.
• test_dirstack test_cdpath_expansion leaving stray testing dirs
• Better completer display for long completions in prompt-toolkit
• Automatucally append newine to target of source alias, so that it may
  be exec'd.
• test_news fails when single graves around word
• Slashes in virtual environment names work in vox
• non string type value in $FORMATTER_DICT turning prompt ugly
• whole prompt turning useless when one formatting function raises an exception
• Fix completion after alias expansion
• Fix hard crash when foreign shell functions fails to run. #1715
• Bug where non-default locations for XDG_DATA_HOME and XONSH_DATA_DIR
  would not expand ~ into the home directory
• Auto quote path completions if path contains 'and' or 'or'
• Completion now works on subcommands after pipe, &&, || and so on.
• cd . and cd now work. Fix indexerror in AUTO_PUSHD case, too.
• Fixed issue with accidentally wrapping generators inside of function calls.
• History indexing with string returns most recent command.