Update deprecation warnings (#15867)

# Description
- Use #15770 to
  - improve `get --sensitive` deprecation warning
  - add deprecation warning for `filter`
- refactor `filter` to use `where` as its implementation
- replace usages of `filter` with `where` in `std`

# User-Facing Changes
- `get --sensitive` will raise a warning only once, during parsing
whereas before it was raised during runtime for each usage.
- using `filter` will raise a deprecation warning, once

# Tests + Formatting
No existing test broke or required tweaking. Additional tests covering
this case was added.
- 🟢 toolkit fmt
- 🟢 toolkit clippy
- 🟢 toolkit test
- 🟢 toolkit test stdlib

# After Submitting
N/A

---------

Co-authored-by: Bahex <17417311+Bahex@users.noreply.github.com>

crates/nu-command/src/filters/filter.rs

@@ -1,6 +1,5 @@
-use super::utils::chain_error_with_input;
-use nu_engine::{ClosureEval, ClosureEvalOnce, command_prelude::*};
-use nu_protocol::engine::Closure;
+use nu_engine::command_prelude::*;
+use nu_protocol::{DeprecationEntry, DeprecationType, ReportMode};
 
 #[derive(Clone)]
 pub struct Filter;
@@ -15,8 +14,8 @@ impl Command for Filter {
     }
 
     fn extra_description(&self) -> &str {
-        r#"This command works similar to 'where' but allows reading the predicate closure from
-a variable. On the other hand, the "row condition" syntax is not supported."#
+        r#"This command works similar to 'where' but can only use a closure as a predicate.
+The "row condition" syntax is not supported."#
     }
 
     fn signature(&self) -> nu_protocol::Signature {
@@ -47,80 +46,20 @@ a variable. On the other hand, the "row condition" syntax is not supported."#
         call: &Call,
         input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
-        let head = call.head;
-        let closure: Closure = call.req(engine_state, stack, 0)?;
+        use super::where_::Where;
+        <Where as Command>::run(&Where, engine_state, stack, call, input)
+    }
 
-        let metadata = input.metadata();
-        match input {
-            PipelineData::Empty => Ok(PipelineData::Empty),
-            PipelineData::Value(Value::Range { .. }, ..)
-            | PipelineData::Value(Value::List { .. }, ..)
-            | PipelineData::ListStream(..) => {
-                let mut closure = ClosureEval::new(engine_state, stack, closure);
-                Ok(input
-                    .into_iter()
-                    .filter_map(move |value| {
-                        match closure
-                            .run_with_value(value.clone())
-                            .and_then(|data| data.into_value(head))
-                        {
-                            Ok(cond) => cond.is_true().then_some(value),
-                            Err(err) => {
-                                let span = value.span();
-                                let err = chain_error_with_input(err, value.is_error(), span);
-                                Some(Value::error(err, span))
-                            }
-                        }
-                    })
-                    .into_pipeline_data(head, engine_state.signals().clone()))
+    fn deprecation_info(&self) -> Vec<nu_protocol::DeprecationEntry> {
+        vec![
+            DeprecationEntry {
+                ty: DeprecationType::Command,
+                report_mode: ReportMode::FirstUse,
+                since: Some("0.105.0".into()),
+                expected_removal: None,
+                help: Some("`where` command can be used instead, as it can now read the predicate closure from a variable".into()),
             }
-            PipelineData::ByteStream(stream, ..) => {
-                if let Some(chunks) = stream.chunks() {
-                    let mut closure = ClosureEval::new(engine_state, stack, closure);
-                    Ok(chunks
-                        .into_iter()
-                        .filter_map(move |value| {
-                            let value = match value {
-                                Ok(value) => value,
-                                Err(err) => return Some(Value::error(err, head)),
-                            };
-
-                            match closure
-                                .run_with_value(value.clone())
-                                .and_then(|data| data.into_value(head))
-                            {
-                                Ok(cond) => cond.is_true().then_some(value),
-                                Err(err) => {
-                                    let span = value.span();
-                                    let err = chain_error_with_input(err, value.is_error(), span);
-                                    Some(Value::error(err, span))
-                                }
-                            }
-                        })
-                        .into_pipeline_data(head, engine_state.signals().clone()))
-                } else {
-                    Ok(PipelineData::Empty)
-                }
-            }
-            // This match allows non-iterables to be accepted,
-            // which is currently considered undesirable (Nov 2022).
-            PipelineData::Value(value, ..) => {
-                let result = ClosureEvalOnce::new(engine_state, stack, closure)
-                    .run_with_value(value.clone())
-                    .and_then(|data| data.into_value(head));
-
-                Ok(match result {
-                    Ok(cond) => cond.is_true().then_some(value),
-                    Err(err) => {
-                        let span = value.span();
-                        let err = chain_error_with_input(err, value.is_error(), span);
-                        Some(Value::error(err, span))
-                    }
-                }
-                .into_pipeline_data(head, engine_state.signals().clone()))
-            }
-        }
-        .map(|data| data.set_metadata(metadata))
+        ]
     }
 
     fn examples(&self) -> Vec<Example> {

crates/nu-command/src/filters/get.rs

@@ -1,7 +1,7 @@
 use std::borrow::Cow;
 
 use nu_engine::command_prelude::*;
-use nu_protocol::{Signals, ast::PathMember, report_shell_warning};
+use nu_protocol::{DeprecationEntry, DeprecationType, ReportMode, Signals, ast::PathMember};
 
 #[derive(Clone)]
 pub struct Get;
@@ -132,19 +132,7 @@ If multiple cell paths are given, this will produce a list of values."#
         let cell_path: CellPath = call.req(engine_state, stack, 0)?;
         let rest: Vec<CellPath> = call.rest(engine_state, stack, 1)?;
         let ignore_errors = call.has_flag(engine_state, stack, "ignore-errors")?;
-        let sensitive_span = call.get_flag_span(stack, "sensitive");
         let metadata = input.metadata();
-        if let Some(span) = sensitive_span {
-            report_shell_warning(
-                engine_state,
-                &ShellError::Deprecated {
-                    deprecated: "sensitive flag",
-                    suggestion: "",
-                    span,
-                    help: Some("cell-paths are case-sensitive by default"),
-                },
-            );
-        }
         action(
             input,
             cell_path,
@@ -155,6 +143,18 @@ If multiple cell paths are given, this will produce a list of values."#
         )
         .map(|x| x.set_metadata(metadata))
     }
+
+    fn deprecation_info(&self) -> Vec<DeprecationEntry> {
+        vec![
+            DeprecationEntry {
+                ty: DeprecationType::Flag("sensitive".into()),
+                report_mode: ReportMode::FirstUse,
+                since: Some("0.105.0".into()),
+                expected_removal: None,
+                help: Some("Cell-paths are now case-sensitive by default.\nTo access fields case-insensitively, add `!` after the relevant path member.".into())
+            }
+        ]
+    }
 }
 
 fn action(

crates/nu-command/tests/commands/filter.rs

@@ -14,5 +14,5 @@ fn filter_with_return_in_closure() {
     ));
 
     assert_eq!(actual.out, "[2, 4, 6, 8, 10]");
-    assert!(actual.err.is_empty());
+    assert!(actual.err.contains("deprecated"));
 }

crates/nu-std/std/iter/mod.nu

@@ -18,7 +18,7 @@
 export def find [
     fn: closure # the closure used to perform the search 
 ] {
-    filter {|e| try {do $fn $e} } | try { first }
+    where {|e| try {do $fn $e} } | try { first }
 }
 
 # Returns the index of the first element that matches the predicate or -1 if none
@@ -87,7 +87,7 @@ export def scan [ # -> list<any>
 #
 # This is equivalent to 
 #
-#     $in | each $fn | filter $fn
+#     $in | each $fn | where $fn
 @example "Get the squares of elements that can be squared" {
     [2 5 "4" 7] | iter filter-map {|e| $e ** 2}
 } --result [4, 25, 49]
@@ -101,7 +101,7 @@ export def filter-map [
             null 
         }
     } 
-    | filter {|e|
+    | where {|e|
         $e != null
     }
 }

crates/nu-std/std/xml/mod.nu

@@ -62,7 +62,7 @@ def xupdate-string-step [ step: string rest: list updater: closure ] {
     let input = $in
 
     # Get a list of elements to be updated and their indices
-    let to_update = ($input.content | enumerate | filter {|it|
+    let to_update = ($input.content | enumerate | where {|it|
         let item = $it.item
         $step == '*' or $item.tag == $step
     })

crates/nu-std/testing.nu

@@ -333,20 +333,20 @@ export def run-tests [
                 commands: (get-annotated $row.name)
             }
         }
-        | filter {|x| ($x.commands|length) > 0}
+        | where {|x| ($x.commands|length) > 0}
         | upsert commands {|module|
             $module.commands
             | create-test-record
         }
         | flatten
-        | filter {|x| ($x.test|length) > 0}
-        | filter {|x| if ($exclude_module|is-empty) {true} else {$x.name !~ $exclude_module}}
-        | filter {|x| if ($test|is-empty) {true} else {$x.test|any {|y| $y =~ $test}}}
-        | filter {|x| if ($module|is-empty) {true} else {$module == $x.name}}
+        | where {|x| ($x.test|length) > 0}
+        | where {|x| if ($exclude_module|is-empty) {true} else {$x.name !~ $exclude_module}}
+        | where {|x| if ($test|is-empty) {true} else {$x.test|any {|y| $y =~ $test}}}
+        | where {|x| if ($module|is-empty) {true} else {$module == $x.name}}
         | update test {|x|
             $x.test
-            | filter {|y| if ($test|is-empty) {true} else {$y =~ $test}}
-            | filter {|y| if ($exclude|is-empty) {true} else {$y !~ $exclude}}
+            | where {|y| if ($test|is-empty) {true} else {$y =~ $test}}
+            | where {|y| if ($exclude|is-empty) {true} else {$y !~ $exclude}}
         }
     )
     if $list {