xonsh

things I'm used to in bash that need to work in xonsh:

• theme/colorize dark terminals (cygwin) and light terminals (ilc, rserver)
• using ! to retrieve history cmd

• tab completion finds items in other directories instead of local

• find/grep from tutorial page (DONE)

• plain bash/busybox cmds: find, grep (my own find: DONE)

other:

Tutorial: Programmable Tab-Completion

Customizing the Prompt

use of !(), ![], $(), $[]

this is subp.py:

# ------------------------------------------
#
print("plain date")
date

print("bang sq date")
![date]

print("=============")
print("![date} >>>> bang sq: output to stdout, rc is value struct, but not iterable")
rc = ![date]
print_cmdout(rc)

print("$[date] >>>> dollar sq: output to stdout, rc is none")
rc = $[date]
print("rc=", rc)

# ------------------------------
print("!(date) >>>> bang paren: output to variable (not stdout), value is cmd struct and is iterable")

try:
    if $OS.startswith("Windows"):   # we must be on cygwin
        $THREAD_SUBPROCS=True
except:
    pass

rc = !(printenv)
print("If you iterate over the CommandPipeline object, it will yield lines of its output.")
print("NEED to explicitly set THREAD_SUBPROCS on cygwin")
print("len=", len(rc))
print("type=", type(rc))
for rr in rc:
    print("    rr=", rr)
print_cmdout(rc)

print("---")
try:
    if $OS.startswith("Windows"):   # we must be on cygwin
        $THREAD_SUBPROCS=False
except:
    pass

print("$(date) >>>> dollar paren: output to variable (not stdout), no rc or struct")
rc = $(date)
print("rc=", rc)

Captured Subprocess with $() and !()

Uncaptured Subprocess with $[] and ![]

redirection

todo: redirection

filename globbing

Filename Globbing with *

=================== all items below are < 9/19/2020 ==================

attempts to use native install

1) plain unix command:

ls: xonsh: subprocess mode: permission denied: ls

2) invalid command

$ nonsense
xonsh: For full traceback set: $XONSH_SHOW_TRACEBACK = True
xonsh: subprocess mode: command not found: nonsense

3) full path to cygwin cmd:

$ /usr/bin/ls
from_git  notes.txt
<terminal hangs>

4) full path with .exe:

wendell@wwtlaptop ~/xonsh_testing $ /usr/bin/ls.exe
from_git  notes.txt
<terminal hangs>

attempts to fix:

> pip3.7 install pyreadline
...

>>> import pyreadline
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.7/site-packages/pyreadline/__init__.py", line 12, in <module>
    from . import logger, clipboard, lineeditor, modes, console
  File "/usr/lib/python3.7/site-packages/pyreadline/clipboard/__init__.py", line 13, in <module>
    from .win32_clipboard import GetClipboardText, SetClipboardText
  File "/usr/lib/python3.7/site-packages/pyreadline/clipboard/win32_clipboard.py", line 37, in <module>
    import ctypes.wintypes as wintypes
  File "/usr/lib/python3.7/ctypes/wintypes.py", line 20, in <module>
    class VARIANT_BOOL(ctypes._SimpleCData):
ValueError: _type_ 'v' not supported

gitter

my answer on gitter (https://gitter.im/xonsh/xonsh):
Anthony Scopatz @scopatz 00:15
Hmm that is weird @wendellwt - we used to have someone who paid closer attention to cygwin. We are happy to get error reports & pull requests

git repo

initial clone:

    > cd xonsh_testing/from_git/
    > git clone https://github.com/xonsh/xonsh.git

later:

    > cd xonsh/
    > git pull

EDIT as needed, then:

    > python3.7 setup.py build
    ...
    copying xonsh/prompt/__init__.py -> build/lib/xonsh/prompt
    copying xonsh/dev.githash -> build/lib/xonsh
    running build_scripts

    > python3.7 setup.py install
    ...
    Installing xonsh script to /usr/bin
    Installing xonsh-cat script to /usr/bin

and finally:

    > xonsh

            Welcome to the xonsh shell (0.9.21.dev9.dev9.dev12.dev26.dev26)

              ~ Piggy glanced nervously into hell and cradled the xonsh ~

    xonfig tutorial    ->    Launch the tutorial in the browser
    xonfig web         ->    Run the configuration tool in the browser and claim your shell
    (Note: Run the configuration tool or create a ~/.xonshrc file to suppress the welcome screen)

    wendell@wwtlaptop ~/xonsh_testing/from_git/xonsh $

but then...???

experimental editing

edit near line 753:

    > vim xonsh/xonfig.py
        ("{{INTENSE_WHITE}}Welcome-wt2 to the xonsh shell ({version}){{NO_COLOR}}", "^", " "),

    > python3.7 setup.py build
    > python3.7 setup.py install

ok, at least that change shows up...

it appears that edits to xonsh/xonfig.py show up in xonsh/__amalgam__.py and /build/lib/xonsh/__amalgam__.py

hmm...

FILES EDITED:

• xonsh/xonfig.py
• xonsh/shell.py
• xonsh/readline_shell.py