extern/nushell
1
0
Fork 1
mirror of https://github.com/nushell/nushell.git synced 2025-08-09 09:05:47 +02:00
Code Issues Packages Projects Releases Wiki Activity

Allow $env and mutable records to be mutated by = (closes #7110) (#7318)

Browse Source 
# Description

Closes #7110. ~~Note that unlike "real" `mut` vars, $env can be deeply
mutated via stuff like `$env.PYTHON_IO_ENCODING = utf8` or
`$env.config.history.max_size = 2000`. So, it's a slightly awkward
special case, arguably justifiable because of what $env represents (the
environment variables of your system, which is essentially "outside"
normal Nushell regulations).~~
EDIT: Now allows all `mut` vars to be deeply mutated using `=`, on
request.

# User-Facing Changes

See above.

# Tests + Formatting

Don't forget to add tests that cover your changes.

Make sure you've run and fixed any issues with these commands:

- `cargo fmt --all -- --check` to check standard code formatting (`cargo
fmt --all` applies these changes)
- `cargo clippy --workspace -- -D warnings -D clippy::unwrap_used -A
clippy::needless_collect` to check that you're using the standard code
style
- `cargo test --workspace` to check that all tests pass

# After Submitting

If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
This commit is contained in:
Leon
2022-12-07 03:51:55 +10:00
committed by GitHub
parent 48ade4993d
commit 9b41f9ecb8
6 changed files with 129 additions and 59 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
crates/nu-engine/src/eval.rs
View File

@ -491,30 +491,37 @@ pub fn eval_expression(
}
Expr::FullCellPath(cell_path) => match &cell_path.head.expr {
Expr::Var(var_id) | Expr::VarDecl(var_id) => {
if var_id == &ENV_VARIABLE_ID {
// let mut lhs =
// eval_expression(engine_state, stack, &cell_path.head)?;
//lhs.update_data_at_cell_path(&cell_path.tail, rhs)?;
match &cell_path.tail[0] {
PathMember::String { val, .. } => {
stack.add_env_var(val.to_string(), rhs);
}
PathMember::Int { val, .. } => {
stack.add_env_var(val.to_string(), rhs);
// The $env variable is considered "mutable" in Nushell.
// As such, give it special treatment here.
let is_env = var_id == &ENV_VARIABLE_ID;
if is_env || engine_state.get_var(*var_id).mutable {
let mut lhs =
eval_expression(engine_state, stack, &cell_path.head)?;
lhs.upsert_data_at_cell_path(&cell_path.tail, rhs)?;
if is_env {
// The special $env treatment: for something like $env.config.history.max_size = 2000,
// get $env.config (or whichever one it is) AFTER the above mutation, and set it
// as the "config" environment variable.
let vardata = lhs.follow_cell_path(
&[cell_path.tail[0].clone()],
false,
)?;
match &cell_path.tail[0] {
PathMember::String { val, .. } => {
stack.add_env_var(val.to_string(), vardata);
}
// In case someone really wants an integer env-var
PathMember::Int { val, .. } => {
stack.add_env_var(val.to_string(), vardata);
}
}
} else {
stack.vars.insert(*var_id, lhs);
}
Ok(Value::nothing(cell_path.head.span))
} else {
let var_info = engine_state.get_var(*var_id);
if var_info.mutable {
let mut lhs =
eval_expression(engine_state, stack, &cell_path.head)?;
lhs.update_data_at_cell_path(&cell_path.tail, rhs)?;
stack.vars.insert(*var_id, lhs);
Ok(Value::nothing(cell_path.head.span))
} else {
Err(ShellError::AssignmentRequiresMutableVar(lhs.span))
}
Err(ShellError::AssignmentRequiresMutableVar(lhs.span))
}
}
_ => Err(ShellError::AssignmentRequiresVar(lhs.span)),