Add fuzzy/ignore flag to get (#641)

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

@@ -1,7 +1,7 @@
 use nu_engine::CallExt;
 use nu_protocol::ast::{Call, CellPath};
 use nu_protocol::engine::{Command, EngineState, Stack};
-use nu_protocol::{Category, IntoPipelineData, PipelineData, Signature, SyntaxShape};
+use nu_protocol::{Category, IntoPipelineData, PipelineData, Signature, SyntaxShape, Value};
 
 #[derive(Clone)]
 pub struct Get;
@@ -22,6 +22,11 @@ impl Command for Get {
                 SyntaxShape::CellPath,
                 "the cell path to the data",
             )
+            .switch(
+                "ignore-errors",
+                "return nothing if path can't be found",
+                Some('i'),
+            )
             .category(Category::Filters)
     }
 
@@ -33,9 +38,19 @@ impl Command for Get {
         input: PipelineData,
     ) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
         let cell_path: CellPath = call.req(engine_state, stack, 0)?;
+        let ignore_errors = call.has_flag("ignore-errors");
 
-        input
+        let output = input
             .follow_cell_path(&cell_path.members, call.head)
-            .map(|x| x.into_pipeline_data())
+            .map(|x| x.into_pipeline_data());
+
+        if ignore_errors {
+            match output {
+                Ok(output) => Ok(output),
+                Err(_) => Ok(Value::Nothing { span: call.head }.into_pipeline_data()),
+            }
+        } else {
+            output
+        }
     }
 }

src/tests/test_table_operations.rs

@@ -210,3 +210,8 @@ fn length_for_columns() -> TestResult {
 fn length_for_rows() -> TestResult {
     run_test(r#"[[name,age,grade]; [bill,20,a] [a b c]] | length"#, "2")
 }
+
+#[test]
+fn get_fuzzy() -> TestResult {
+    run_test("(ls | get -i foo) == $nothing", "true")
+}