Baseline environment and configuration work. (#1287)

crates/nu-protocol/src/value.rs

@@ -122,7 +122,6 @@ impl UntaggedValue {
     }
 
     /// Helper for creating row values
-    #[allow(unused)]
     pub fn row(entries: IndexMap<String, Value>) -> UntaggedValue {
         UntaggedValue::Row(entries.into())
     }

crates/nu-test-support/Cargo.toml

@@ -10,14 +10,17 @@ license = "MIT"
 doctest = false
 
 [dependencies]
+nu = { path = "../..", version = "0.8.0" }
 nu-parser = { path = "../nu-parser", version = "0.8.0" }
 nu-source = { path = "../nu-source", version = "0.8.0" }
+nu-protocol = { path = "../nu-protocol", version = "0.8.0" }
 
 app_dirs = "1.2.1"
 dunce = "1.0.0"
 getset = "0.0.9"
 glob = "0.3.0"
 tempfile = "3.1.0"
+indexmap = { version = "1.3.0", features = ["serde-1"] }
 
 [build-dependencies]
 nu-build = { version = "0.8.0", path = "../nu-build" }

crates/nu-value-ext/Cargo.toml

@@ -17,6 +17,7 @@ nu-protocol = { path = "../nu-protocol", version = "0.8.0" }
 
 num-traits = "0.2.10"
 itertools = "0.8.2"
+indexmap = { version = "1.3.0", features = ["serde-1"] }
 
 [build-dependencies]
 nu-build = { version = "0.8.0", path = "../nu-build" }

crates/nu-value-ext/src/lib.rs

@@ -8,6 +8,8 @@ use nu_source::{HasSpan, PrettyDebug, Spanned, SpannedItem, Tag, Tagged, TaggedI
 use num_traits::cast::ToPrimitive;
 
 pub trait ValueExt {
+    fn row_entries(&self) -> RowValueIter<'_>;
+    fn table_entries(&self) -> TableValueIter<'_>;
     fn into_parts(self) -> (UntaggedValue, Tag);
     fn get_data(&self, desc: &str) -> MaybeOwned<'_, Value>;
     fn get_data_by_key(&self, name: Spanned<&str>) -> Option<Value>;
@@ -39,6 +41,14 @@ pub trait ValueExt {
 }
 
 impl ValueExt for Value {
+    fn row_entries(&self) -> RowValueIter<'_> {
+        row_entries(self)
+    }
+
+    fn table_entries(&self) -> TableValueIter<'_> {
+        table_entries(self)
+    }
+
     fn into_parts(self) -> (UntaggedValue, Tag) {
         (self.value, self.tag)
     }
@@ -524,3 +534,52 @@ pub(crate) fn get_mut_data_by_member<'value>(
         _ => None,
     }
 }
+
+pub enum RowValueIter<'a> {
+    Empty,
+    Entries(indexmap::map::Iter<'a, String, Value>),
+}
+
+pub enum TableValueIter<'a> {
+    Empty,
+    Entries(std::slice::Iter<'a, Value>),
+}
+
+impl<'a> Iterator for RowValueIter<'a> {
+    type Item = (&'a String, &'a Value);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self {
+            RowValueIter::Empty => None,
+            RowValueIter::Entries(iter) => iter.next(),
+        }
+    }
+}
+
+impl<'a> Iterator for TableValueIter<'a> {
+    type Item = &'a Value;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        match self {
+            TableValueIter::Empty => None,
+            TableValueIter::Entries(iter) => iter.next(),
+        }
+    }
+}
+
+pub fn table_entries(value: &Value) -> TableValueIter<'_> {
+    match &value.value {
+        UntaggedValue::Table(t) => TableValueIter::Entries(t.iter()),
+        _ => TableValueIter::Empty,
+    }
+}
+
+pub fn row_entries(value: &Value) -> RowValueIter<'_> {
+    match &value.value {
+        UntaggedValue::Row(o) => {
+            let iter = o.entries.iter();
+            RowValueIter::Entries(iter)
+        }
+        _ => RowValueIter::Empty,
+    }
+}