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