This adds support for (limited) mutable variables. Mutable variables are created with mut much the same way immutable variables are made with let.
Mutable variables allow mutation via the assignment operator (=).
❯ mut x = 100
❯ $x = 200
❯ print $x
200
Mutable variables are limited in that they're only tended to be used in the local code block. Trying to capture a local variable will result in an error:
❯ mut x = 123; {|| $x }
Error: nu::parser::expected_keyword (link)
× Capture of mutable variable.
The intent of this limitation is to reduce some of the issues with mutable variables in general: namely they make code that's harder to reason about. By reducing the scope that a mutable variable can be used it, we can help create local reasoning about them.
Mutation can occur with fields as well, as in this case:
❯ mut y = {abc: 123}
❯ $y.abc = 456
❯ $y
On a historical note: mutable variables are something that we resisted for quite a long time, leaning as much as we could on the functional style of pipelines and dataflow. That said, we've watched folks struggle to work with reduce as an approximation for patterns that would be trivial to express with local mutation. With that in mind, we're leaning towards the happy path.
* add a new command to query the registry on windows
* cross platform tweaks
* return nushell datatype
* change visibility of exec and registry commands
* remove export_env command
* remove several export env usage in test code
* adjust hiding relative test case
* fix clippy
* adjust tests
* update tests
* unignore these tests to expose ut failed
* using `use` instead of `overlay use` in some tests
* Revert "using `use` instead of `overlay use` in some tests"
This reverts commit 2ae24b24c3.
* Revert "adjust hiding relative test case"
This reverts commit 4369af6d05.
* Bring back module example
* Revert "update tests"
This reverts commit 6ae94ef513.
* Fix tests
* "Fix" a test
* Remove remaining deprecated env functionality
* Re-enable environment hiding for `hide`
To not break virtualenv since the overlay update is not merged yet
* Fix hiding env in `hide` and ignore some tests
Co-authored-by: kubouch <kubouch@gmail.com>
* Initialize join.rs as a copy of collect.rs
* Evolve StrCollect into StrJoin
* Replace 'str collect' with 'str join' everywhere
git ls-files | lines | par-each { |it| sed -i 's,str collect,str join,g' $it }
* Deprecate 'str collect'
* Revert "Deprecate 'str collect'"
This reverts commit 959d14203e.
* Change `str collect` help message to say that it is deprecated
We cannot remove `str collect` currently (i.e. via
`nu_protocol::ShellError::DeprecatedCommand` since a prominent project
uses the API:
b85542c31c/src/virtualenv/activation/nushell/activate.nu (L43)
* Add a 'commandline' command for manipulating the current buffer
from `executehostcommand` keybindings. Inspired by fish:
https://fishshell.com/docs/current/cmds/commandline.html
* Update to development reedline
Includes nushell/reedline#472
Co-authored-by: sholderbach <sholderbach@users.noreply.github.com>
* nu-path: use 'linux' code on all non-macOS unix
* nu-command: cfg() the Ps command to platforms it's actually implemented on
* nu-system: cfg() the Ps test to the platforms Ps is implemented on
* start working on source-env
* WIP
* Get most tests working, still one to go
* Fix file-relative paths; Report parser error
* Fix merge conflicts; Restore source as deprecated
* Tests: Use source-env; Remove redundant tests
* Fmt
* Respect hidden env vars
* Fix file-relative eval for source-env
* Add file-relative eval to "overlay use"
* Use FILE_PWD only in source-env and "overlay use"
* Ignore new tests for now
This will be another issue
* Throw an error if setting FILE_PWD manually
* Fix source-related test failures
* Fix nu-check to respect FILE_PWD
* Fix corrupted spans in source-env shell errors
* Fix up some references to old source
* Remove deprecation message
* Re-introduce deleted tests
Co-authored-by: kubouch <kubouch@gmail.com>
* Add hide-env to hide env vars; Cleanup tests
Also, there were some old unalias tests that I converted to hide.
* Add missing file
* Re-enable hide for env vars
* Fix test
* Rename did you mean error back
It was causing random tests to break
* Allow private imports inside modules
Can call `use ...` inside modules now.
* Add more tests
* Add a leak test
* Refactor exportables; Prepare for 'export use'
* Fix description
* Implement 'export use' command
This allows re-exporting module's commands and aliases from another
module.
* Add more tests; Fix import pattern list strings
The import pattern strings didn't trim the surrounding quotes.
* Add ignored test
* Remove comment
* Split delta and environment merging
* Move table mode to a more logical place
* Cleanup
* Merge environment after reading default_env.nu
* Fmt
* allow for easy config reset with a single command
* add slightly better help, rebase
* add option to make no backups, make all backups unique through including UNIX Epoch Time in the filename
* time is now formatted in rfc3339
* time is now formatted in a window-friendly format
* add bytes collect
* index_of support searching from end
* add bytes remove
* make bytes replace work better for empty pattern
* add bytes build
* remove comment
* tweak words
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
* feat: deprecate `hash base64` command
* feat: extend `decode` and `encode` command families
This commit
- Adds `encode` command family
- Backports `hash base64` features to `encode base64` and `decode base64` subcommands.
- Refactors code a bit and extends tests for encodings
- `decode base64` returns a binary `Value` (that may be decoded into a string using `decode` command)
* feat: add `--binary(-b)` flag to `decode base64`
Default output type is now string, but binary can be requested using this new flag.
* input and output tests
* input and output types for dfr
* expression converter
* remove deprecated command
* correct expressions
* cargo clippy
* identifier for ls
* cargo clippy
* type for head and tail expression
* modify full cell path if block
* WIP: Start laying overlays
* Rename Overlay->Module; Start adding overlay
* Revamp adding overlay
* Add overlay add tests; Disable debug print
* Fix overlay add; Add overlay remove
* Add overlay remove tests
* Add missing overlay remove file
* Add overlay list command
* (WIP?) Enable overlays for env vars
* Move OverlayFrames to ScopeFrames
* (WIP) Move everything to overlays only
ScopeFrame contains nothing but overlays now
* Fix predecls
* Fix wrong overlay id translation and aliases
* Fix broken env lookup logic
* Remove TODOs
* Add overlay add + remove for environment
* Add a few overlay tests; Fix overlay add name
* Some cleanup; Fix overlay add/remove names
* Clippy
* Fmt
* Remove walls of comments
* List overlays from stack; Add debugging flag
Currently, the engine state ordering is somehow broken.
* Fix (?) overlay list test
* Fix tests on Windows
* Fix activated overlay ordering
* Check for active overlays equality in overlay list
This removes the -p flag: Either both parser and engine will have the
same overlays, or the command will fail.
* Add merging on overlay remove
* Change help message and comment
* Add some remove-merge/discard tests
* (WIP) Track removed overlays properly
* Clippy; Fmt
* Fix getting last overlay; Fix predecls in overlays
* Remove merging; Fix re-add overwriting stuff
Also some error message tweaks.
* Fix overlay error in the engine
* Update variable_completions.rs
* Adds flags and optional arguments to view-source (#5446)
* added flags and optional arguments to view-source
* removed redundant code
* removed redundant code
* fmt
* fix bug in shell_integration (#5450)
* fix bug in shell_integration
* add some comments
* enable cd to work with directory abbreviations (#5452)
* enable cd to work with abbreviations
* add abbreviation example
* fix tests
* make it configurable
* make cd recornize symblic link (#5454)
* implement seq char command to generate single character sequence (#5453)
* add tmp code
* add seq char command
* Add split number flag in `split row` (#5434)
Signed-off-by: Yuheng Su <gipsyh.icu@gmail.com>
* Add two more overlay tests
* Add ModuleId to OverlayFrame
* Fix env conversion accidentally activating overlay
It activated overlay from permanent state prematurely which would
cause `overlay add` to misbehave.
* Remove unused parameter; Add overlay list test
* Remove added traces
* Add overlay commands examples
* Modify TODO
* Fix $nu.scope iteration
* Disallow removing default overlay
* Refactor some parser errors
* Remove last overlay if no argument
* Diversify overlay examples
* Make it possible to update overlay's module
In case the origin module updates, the overlay add loads the new module,
makes it overlay's origin and applies the changes. Before, it was
impossible to update the overlay if the module changed.
Co-authored-by: JT <547158+jntrnr@users.noreply.github.com>
Co-authored-by: pwygab <88221256+merelymyself@users.noreply.github.com>
Co-authored-by: Darren Schroeder <343840+fdncred@users.noreply.github.com>
Co-authored-by: WindSoilder <WindSoilder@outlook.com>
Co-authored-by: Yuheng Su <gipsyh.icu@gmail.com>
