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use derive_new::new;
use nu_errors::ShellError;
use nu_protocol::{format_primitive, UntaggedValue, Value};
use ptree::item::StringItem;
use ptree::output::print_tree_with;
use ptree::print_config::PrintConfig;
use ptree::style::{Color, Style};
use ptree::TreeBuilder;
pub struct TreeViewer;
#[derive(new)]
pub struct TreeView {
tree: StringItem,
}
impl TreeView {
fn from_value_helper(value: &UntaggedValue, mut builder: &mut TreeBuilder) {
match value {
UntaggedValue::Primitive(p) => {
let _ = builder.add_empty_child(format_primitive(p, None));
}
UntaggedValue::Row(o) => {
for (k, v) in o.entries.iter() {
builder = builder.begin_child(k.clone());
Self::from_value_helper(v, builder);
builder = builder.end_child();
}
}
UntaggedValue::Table(l) => {
for elem in l.iter() {
Self::from_value_helper(elem, builder);
}
}
_ => {}
}
}
pub fn from_value(value: &Value) -> TreeView {
let descs = value.data_descriptors();
let mut tree = TreeBuilder::new("".to_string());
let mut builder = &mut tree;
for desc in descs {
let value = match &value.value {
UntaggedValue::Row(d) => d.get_data(&desc).borrow().clone(),
_ => value.clone(),
};
builder = builder.begin_child(desc.clone());
Self::from_value_helper(&value, &mut builder);
builder = builder.end_child();
}
TreeView::new(builder.build())
}
pub fn render_view(&self) -> Result<(), ShellError> {
let config = {
let mut config = PrintConfig::from_env();
config.branch = Style {
foreground: Some(Color::Green),
dimmed: true,
..Style::default()
};
config.leaf = Style {
bold: true,
..Style::default()
};
config.indent = 4;
config
};
print_tree_with(&self.tree, &config)?;
Ok(())
}
}