nushell/crates/nu-command/src/viewers/table.rs

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use nu_protocol::ast::{Call, PathMember};
use nu_protocol::engine::{Command, EvaluationContext};
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use nu_protocol::{ShellError, Signature, Span, Value};
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use nu_table::StyledString;
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use std::collections::HashMap;
use terminal_size::{Height, Width};
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#[derive(Clone)]
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pub struct Table;
//NOTE: this is not a real implementation :D. It's just a simple one to test with until we port the real one.
impl Command for Table {
fn name(&self) -> &str {
"table"
}
fn usage(&self) -> &str {
"Render the table."
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("table")
}
fn run(
&self,
_context: &EvaluationContext,
call: &Call,
input: Value,
) -> Result<nu_protocol::Value, nu_protocol::ShellError> {
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let term_width = if let Some((Width(w), Height(_h))) = terminal_size::terminal_size() {
w as usize
} else {
80usize
};
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match input {
Value::List { vals, .. } => {
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let table = convert_to_table(vals)?;
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if let Some(table) = table {
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let result = nu_table::draw_table(&table, term_width, &HashMap::new());
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Ok(Value::String {
val: result,
span: call.head,
})
} else {
Ok(Value::Nothing { span: call.head })
}
}
Value::Stream { stream, .. } => {
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let table = convert_to_table(stream)?;
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if let Some(table) = table {
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let result = nu_table::draw_table(&table, term_width, &HashMap::new());
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Ok(Value::String {
val: result,
span: call.head,
})
} else {
Ok(Value::Nothing { span: call.head })
}
}
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Value::Record { cols, vals, .. } => {
let mut output = vec![];
for (c, v) in cols.into_iter().zip(vals.into_iter()) {
output.push(vec![
StyledString {
contents: c,
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style: nu_table::TextStyle::default_field(),
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},
StyledString {
contents: v.into_string(),
style: nu_table::TextStyle::default(),
},
])
}
let table = nu_table::Table {
headers: vec![],
data: output,
theme: nu_table::Theme::rounded(),
};
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let result = nu_table::draw_table(&table, term_width, &HashMap::new());
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Ok(Value::String {
val: result,
span: call.head,
})
}
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Value::Error { error } => Err(error),
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x => Ok(x),
}
}
}
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fn convert_to_table(
iter: impl IntoIterator<Item = Value>,
) -> Result<Option<nu_table::Table>, ShellError> {
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let mut iter = iter.into_iter().peekable();
if let Some(first) = iter.peek() {
let mut headers = first.columns();
if !headers.is_empty() {
headers.insert(0, "#".into());
}
let mut data = vec![];
for (row_num, item) in iter.enumerate() {
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if let Value::Error { error } = item {
return Err(error);
}
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let mut row = vec![row_num.to_string()];
if headers.is_empty() {
row.push(item.into_string())
} else {
for header in headers.iter().skip(1) {
let result = match item {
Value::Record { .. } => {
item.clone().follow_cell_path(&[PathMember::String {
val: header.into(),
span: Span::unknown(),
}])
}
_ => Ok(item.clone()),
};
match result {
Ok(value) => row.push(value.into_string()),
Err(_) => row.push(String::new()),
}
}
}
data.push(row);
}
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Ok(Some(nu_table::Table {
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headers: headers
.into_iter()
.map(|x| StyledString {
contents: x,
style: nu_table::TextStyle::default_header(),
})
.collect(),
data: data
.into_iter()
.map(|x| {
x.into_iter()
.enumerate()
.map(|(col, y)| {
if col == 0 {
StyledString {
contents: y,
style: nu_table::TextStyle::default_header(),
}
} else {
StyledString {
contents: y,
style: nu_table::TextStyle::basic_left(),
}
}
})
.collect::<Vec<StyledString>>()
})
.collect(),
theme: nu_table::Theme::rounded(),
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}))
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} else {
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Ok(None)
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}
}