* update bash to xonsh
* Update bash_to_xsh.rst
* Update bash_to_xsh.rst
* Update docs/bash_to_xsh.rst
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* Update docs/bash_to_xsh.rst
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* Command Alias
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Move the note about the last subprocess and return code to the section on Running Commands.
When found only in the 'Captured Subprocess' section, it implies that the behavior is only available for captured subprocesses, when in fact it's available for any command. This bit could have gone into its own section, but since it's already carved out as a 'Note', it seems fine to put it here in the Running Commands section.
Closes#5591
Reorders and updates the callable alias examples.
- Start with examples of valid return types first, then show uses for
different arguments
- Add example of using stdin (documents behavior from #5233)
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## For community
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Added SpecModifierAlias (#5443) to the tutorial.
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* Added py mention to docs
* Added tests
* Microfix
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* fix section
* added link to latest release
Please update https://xon.sh after merge this.
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### Motivation
I'm using [xonsh-install](https://github.com/anki-code/xonsh-install)
pretty long time and I see that it works pretty predictable, expected
and stable. I suggest to mention this approach in our docs to get more
attention and testing around this from users and some day move
xonsh-install to the xonsh project.
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After #5099#5491 we need more links to xonshrc article in our docs. So
I've added them.
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subj
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Fix#5491:
* fix condition
* added more well organized tests
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### Motivation
In #5099 was introduced the logic where all RC files are loaded in
interactive and non-interactive modes. This logic is not working good
for home based `~/.xonshrc` file.
First of all `~/.xonshrc` is the buffer/accumulator of settings focused
on interactive mode. Most tools with integration with xonsh (e.g.
`conda`, `zoxide`, etc) offer to just do `echo "init_tool()" >>
~/.xonshrc` (`conda` has around 20 lines of init code) to start using
the tool and users are doing this without any doubts.
But because of after 5099 `~/.xonshrc` is executed in non-interactive
mode the adding code to it leads to unexpected and unintended side
effects:
* If you run a script with shebang (e.g. `#!/usr/bin/env xonsh` or
[xonsh-awesome-cli-app](https://github.com/anki-code/xonsh-awesome-cli-app))
or just from `xonsh script.xsh` the code will be unexpected and
unintended slower.
* If you're using xonsh-based tools (e.g. you install them using pip)
and run them in environment that has no packages that initiated in
`~/.xonshrc` you will see epic errors.
* Additional context:
* Bash and Zsh do not load `~/.bashrc` and `~/.zshrc` in non-interactive
mode by the same reasons.
* We have welcome message `Create ~/.xonshrc file manually or use xonfig
to suppress the welcome message` and we don't want to make the process
of creating this file complex.
All of this leads to bad unexpected and unintended experience. This PR
is to fix this.
### Expectation
By doing this fix we assume that experienced user who wants to build
good repeatable run control files will use another ways to create config
files and this has [reflection in
docs](8860f2bd52/docs/xonshrc.rst).
In the nutshell if you want to create the RC files that affect every run
of code you should use one or many of these ways:
* Cross-desktop group (XDG) compliant `~/.config/xonsh/rc.xsh` control
file.
* The system-wide control file `/etc/xonsh/xonshrc` for Linux and OSX
and in `%ALLUSERSPROFILE%\xonsh\xonshrc` on Windows. It controls options
that are applied to all users of Xonsh on a given system.
* The home-based directory `~/.config/xonsh/rc.d/` and system
`/etc/xonsh/rc.d/` can contain .xsh files. They will be executed at
startup in order. This allows for drop-in configuration where your
configuration can be split across scripts and common and local
configurations more easily separated.
In your configs you need to check `$XONSH_INTERACTIVE` and
`$XONSH_LOGIN` explicitly.
### Before
`~/.xonshrc` is used in non-interactive mode.
```xsh
echo "echo RC" >> ~/.xonshrc
cd /tmp
echo "echo Script" > script.xsh
xonsh script.xsh
# RC
# Script
```
```xsh
cd /tmp
echo 'echo RC' >> ~/.xonshrc
echo '#!/usr/bin/env xonsh' > myscript
chmod +x myscript
./myscript
# RC
```
### After
`~/.xonshrc` is not used in non-interactive mode. Use `-i` if you need
it.
```xsh
echo "echo RC" >> ~/.xonshrc
cd /tmp
echo "echo Script" > script.xsh
xonsh script.xsh
# Script
xonsh -i script.xsh
# RC
# Script
```
```xsh
cd /tmp
echo 'echo RC' >> ~/.xonshrc
echo '#!/usr/bin/env xonsh' > myscript
chmod +x myscript
./myscript
```
Closes#5488#4096#5496
### Fun
I want to leave here some nice representation of how it works in
bash/sh/zsh from [twitter
post](https://twitter.com/paxx39/status/1742768007154479109):
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### Motivation
* We have no recommended way to force subprocess command be
(un)threadable
* #4214
* #2119
* #5003
* It's interesting opportunity to have a way to modify specs and CP
using `SpecModifierAlias`.
### Before
```xsh
!(ssh host -T "echo 1")
# output='' # EXPECTED: 1
__xonsh__.commands_cache.threadable_predictors['ssh'] = lambda *a, **kw: True
!(ssh host -T "echo 1")
```
### After
```xsh
xthread
# Mark command as threadable.
!(xthread ssh host -T "echo 1")
# output='1'
```
Closes:
* Closes#4214
* Closes#2119
* Partially closes#5003
Implementation of `SpecModifierAlias` will help in:
* #2618
JFYI #5413
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Closes#3394
### Motivation
After reading [the history of threading and
operators](https://github.com/xonsh/xonsh/issues/5444) I realized that
this was intended, to make the `!()` operator non-blocking. So let's
write about this in tutorial.
### Next steps
In the future we need to solve these points:
* Confusion around `.output` and `.out`.
* Show good cases where non-blocking is doing perfect work to people. Or
remove the non-blocking functionality [to remove
threading](https://github.com/xonsh/xonsh/discussions/4710).
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### Motivation
There is no way to access to the CommandPipeline of executed command in
uncaptured mode. This causes:
* No chance to get return code in one universal way.
* Barrier to trace and inspection.
### Before
```xsh
$(ls nofile)
# No way to access to the CommandPipeline of executed command.
```
### After
```xsh
$(ls nofile)
__xonsh__.last.rtn # In interactive or not interactive.
# 2
```
```xsh
# Sugar sir:
last = type('LastCP', (object,), {'__getattr__':lambda self, name: getattr(__xonsh__.last, name) })()
ls nofile
last.rtn
# 2
```
JFYI #5342
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### Motivation
* To have an ability to manage the output format added ``$XONSH_SUBPROC_OUTPUT_FORMAT`` to switch the way to return the output lines. Default ``stream_lines`` to return text. Alternative ``list_lines`` to return the list of lines. Also supported custom lambda function.
* Additionally the [proposal to change default behavior](https://github.com/xonsh/xonsh/pull/5377#discussion_r1587627131) for a single line case.
* Closes#3924 as soft solution.
### Before
```xsh
mkdir -p /tmp/tst && cd /tmp/tst && touch 1 2 3
$(ls)
# '1\n2\n3\n'
id $(whoami)
# id: ‘pc\n’: no such user: Invalid argument
du $(ls)
# du: cannot access '1'$'\n''2'$'\n''3'$'\n': No such file or directory
ls $(fzf)
# ls: cannot access 'FUNDING.yml'$'\n': No such file or directory
```
### After
```xsh
mkdir -p /tmp/tst && cd /tmp/tst && touch 1 2 3
$XONSH_SUBPROC_OUTPUT_FORMAT = 'list_lines'
$(ls)
# ['1', '2', '3']
[f for f in $(ls)]
# ['1', '2', '3']
id $(whoami)
# uid=501(user) gid=20(staff)
du $(ls)
# 0 1
# 0 2
# 0 3
ls $(fzf)
# FUNDING.yml
# etc
mkdir -p /tmp/@($(whoami))/dir
cat /etc/passwd | grep $(whoami)
```
### Notes
* It will be good to improve parser for cases like `mkdir -p /tmp/$(whoami)/dir`. PR is welcome!
* I named the default mode as `stream_lines` (instead of just `stream` or `raw`) because in fact we transform raw output into stream of lines and possibly reduce the length of output ([replacing `\r\n` to `\n`](c3a12b2a9c/xonsh/procs/pipelines.py (L380-L383))). May be some day we need to add raw "stream" output format.
* Now anybody can implement bash `IFS` behavior in [bashisms](https://github.com/xonsh/xontrib-bashisms).
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* Add paragraph about support for xonsh as the default shell.
Ref #4469
Also, updated the text to use 'VS Code', which is the preferred short name.
* Add news entry.
* Update intro.rst to mention Python 3.6
The homepage mentions 3.6, so I update this section to be in line
* Create upgrade-python-version.rst
Add news item for https://github.com/xonsh/xonsh/pull/5193
