Line charts. Chart plugin sub command extraction. (#2627)

crates/nu-cli/src/cli.rs

@@ -114,6 +114,8 @@ pub fn create_default_context(interactive: bool) -> Result<EvaluationContext, Bo
             whole_stream_command(Shells),
             whole_stream_command(Enter),
             whole_stream_command(Exit),
+            // Viz
+            whole_stream_command(Chart),
             // Viewers
             whole_stream_command(Autoview),
             whole_stream_command(Table),

crates/nu-cli/src/commands.rs

@@ -17,6 +17,7 @@ pub(crate) mod build_string;
 pub(crate) mod cal;
 pub(crate) mod cd;
 pub(crate) mod char_;
+pub(crate) mod chart;
 pub(crate) mod classified;
 #[cfg(feature = "clipboard-cli")]
 pub(crate) mod clip;
@@ -142,6 +143,7 @@ pub(crate) use benchmark::Benchmark;
 pub(crate) use build_string::BuildString;
 pub(crate) use cal::Cal;
 pub(crate) use char_::Char;
+pub(crate) use chart::Chart;
 pub(crate) use compact::Compact;
 pub(crate) use config::{
     Config, ConfigClear, ConfigGet, ConfigLoad, ConfigPath, ConfigRemove, ConfigSet, ConfigSetInto,

crates/nu-cli/src/commands/chart.rs

@@ -0,0 +1,52 @@
+use crate::commands::WholeStreamCommand;
+use crate::prelude::*;
+use nu_errors::ShellError;
+use nu_protocol::{ReturnSuccess, Signature, UntaggedValue};
+
+#[derive(Clone)]
+pub struct Chart;
+
+#[async_trait]
+impl WholeStreamCommand for Chart {
+    fn name(&self) -> &str {
+        "chart"
+    }
+
+    fn signature(&self) -> Signature {
+        Signature::build("chart")
+    }
+
+    fn usage(&self) -> &str {
+        "Displays charts."
+    }
+
+    async fn run(
+        &self,
+        _args: CommandArgs,
+        registry: &CommandRegistry,
+    ) -> Result<OutputStream, ShellError> {
+        if registry.get_command("chart bar").is_none() {
+            return Err(ShellError::untagged_runtime_error(
+                "nu_plugin_chart not installed.",
+            ));
+        }
+
+        let registry = registry.clone();
+        Ok(OutputStream::one(Ok(ReturnSuccess::Value(
+            UntaggedValue::string(crate::commands::help::get_help(&Chart, &registry))
+                .into_value(Tag::unknown()),
+        ))))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Chart;
+
+    #[test]
+    fn examples_work_as_expected() {
+        use crate::examples::test as test_examples;
+
+        test_examples(Chart {})
+    }
+}