use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{ColumnPath, Primitive, Signature, SyntaxShape, UntaggedValue, Value};
use nu_source::Tagged;
use num_bigint::{BigInt, BigUint, ToBigInt};
use nu_data::base::shape::InlineShape;
use num_format::Locale;
use num_traits::{Pow, Signed};
use std::iter;
pub struct SubCommand;
impl WholeStreamCommand for SubCommand {
fn name(&self) -> &str {
"into string"
}
fn signature(&self) -> Signature {
Signature::build("into string")
.rest(
"rest",
SyntaxShape::ColumnPath,
"column paths to convert to string (for table input)",
)
.named(
"decimals",
SyntaxShape::Int,
"decimal digits to which to round",
Some('d'),
)
}
fn usage(&self) -> &str {
"Convert value to string"
}
fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
into_string(args)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "convert decimal to string and round to nearest integer",
example: "echo 1.7 | into string -d 0",
result: Some(vec![UntaggedValue::string("2").into_untagged_value()]),
},
Example {
description: "convert decimal to string",
example: "echo 4.3 | into string",
result: Some(vec![UntaggedValue::string("4.3").into_untagged_value()]),
},
Example {
description: "convert string to string",
example: "echo '1234' | into string",
result: Some(vec![UntaggedValue::string("1234").into_untagged_value()]),
},
Example {
description: "convert boolean to string",
example: "echo $true | into string",
result: Some(vec![UntaggedValue::string("true").into_untagged_value()]),
},
Example {
description: "convert date to string",
example: "date now | into string",
result: None,
},
Example {
description: "convert filepath to string",
example: "ls Cargo.toml | get name | into string",
result: None,
},
Example {
description: "convert filesize to string",
example: "ls Cargo.toml | get size | into string",
result: None,
},
]
}
}
fn into_string(args: CommandArgs) -> Result<OutputStream, ShellError> {
let decimals: Option<Tagged<u64>> = args.get_flag("decimals")?;
let column_paths: Vec<ColumnPath> = args.rest(0)?;
let digits = decimals.as_ref().map(|tagged| tagged.item);
let group_digits = false;
Ok(args
.input
.map(move |v| {
if column_paths.is_empty() {
action(&v, v.tag(), digits, group_digits)
} else {
let mut ret = v;
for path in &column_paths {
ret = ret.swap_data_by_column_path(
path,
Box::new(move |old| action(old, old.tag(), digits, group_digits)),
)?;
}
Ok(ret)
}
})
.into_input_stream())
}
pub fn action(
input: &Value,
tag: impl Into<Tag>,
digits: Option<u64>,
group_digits: bool,
) -> Result<Value, ShellError> {
match &input.value {
UntaggedValue::Primitive(prim) => Ok(UntaggedValue::string(match prim {
Primitive::Int(int) => {
if group_digits {
format_int(*int) } else {
int.to_string()
}
}
Primitive::BigInt(int) => {
if group_digits {
format_bigint(int) } else {
int.to_string()
}
}
Primitive::Decimal(dec) => format_decimal(dec.clone(), digits, group_digits),
Primitive::String(a_string) => a_string.to_string(),
Primitive::Boolean(a_bool) => a_bool.to_string(),
Primitive::Date(a_date) => a_date.format("%c").to_string(),
Primitive::FilePath(a_filepath) => a_filepath.as_path().display().to_string(),
Primitive::Filesize(a_filesize) => {
let byte_string = InlineShape::format_bytes(*a_filesize, None);
byte_string.1
}
Primitive::Nothing => "nothing".to_string(),
_ => {
return Err(ShellError::unimplemented(&format!(
"into string for primitive: {:?}",
prim
)))
}
})
.into_value(tag)),
UntaggedValue::Row(_) => Err(ShellError::labeled_error(
"specify column to use 'into string'",
"found table",
input.tag.clone(),
)),
UntaggedValue::Table(_) => Err(ShellError::unimplemented("into string for table")),
_ => Err(ShellError::unimplemented("into string for non-primitive")),
}
}
fn format_int(int: i64) -> String {
int.to_string()
}
fn format_bigint(int: &BigInt) -> String {
int.to_string()
}
fn format_decimal(mut decimal: BigDecimal, digits: Option<u64>, group_digits: bool) -> String {
if let Some(n) = digits {
decimal = round_decimal(&decimal, n)
}
if decimal.is_integer() && (digits.is_none() || digits == Some(0)) {
let int = decimal
.to_bigint()
.expect("integer BigDecimal should convert to BigInt");
return if group_digits {
int.to_string()
} else {
format_bigint(&int)
};
}
let (int, exp) = decimal.as_bigint_and_exponent();
let factor = BigInt::from(10).pow(BigUint::from(exp as u64)); let int_part = &int / &factor;
let dec_part = (&int % &factor)
.abs()
.to_biguint()
.expect("BigInt::abs should always produce positive signed BigInt and thus BigUInt")
.to_str_radix(10);
let dec_str = if let Some(n) = digits {
dec_part
.chars()
.chain(iter::repeat('0'))
.take(n as usize)
.collect()
} else {
String::from(dec_part.trim_end_matches('0'))
};
let format_default_loc = |int_part: BigInt| {
let loc = Locale::en;
let (int_str, sep) = (int_part.to_string(), String::from(loc.decimal()));
format!("{}{}{}", int_str, sep, dec_str)
};
format_default_loc(int_part)
}
fn round_decimal(decimal: &BigDecimal, mut digits: u64) -> BigDecimal {
let mut mag = decimal.clone();
while mag >= BigDecimal::from(1) {
mag = mag / 10;
digits += 1;
}
decimal.with_prec(digits)
}
#[cfg(test)]
mod tests {
use super::ShellError;
use super::SubCommand;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
test_examples(SubCommand {})
}
}