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use std::convert::TryInto;
use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{ColumnPath, Primitive, Signature, SyntaxShape, UntaggedValue, Value};
use num_bigint::ToBigInt;
pub struct SubCommand;
impl WholeStreamCommand for SubCommand {
fn name(&self) -> &str {
"into filesize"
}
fn signature(&self) -> Signature {
Signature::build("into filesize").rest(
"rest",
SyntaxShape::ColumnPath,
"column paths to convert to filesize (for table input)",
)
}
fn usage(&self) -> &str {
"Convert value to filesize"
}
fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
into_filesize(args)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Convert string to filesize in table",
example: "echo [[bytes]; ['5'] [3.2] [4] [2kb]] | into filesize bytes",
result: Some(vec![
UntaggedValue::row(indexmap! {
"bytes".to_string() => UntaggedValue::filesize(5).into(),
})
.into(),
UntaggedValue::row(indexmap! {
"bytes".to_string() => UntaggedValue::filesize(3).into(),
})
.into(),
UntaggedValue::row(indexmap! {
"bytes".to_string() => UntaggedValue::filesize(4).into(),
})
.into(),
UntaggedValue::row(indexmap! {
"bytes".to_string() => UntaggedValue::filesize(2000).into(),
})
.into(),
]),
},
Example {
description: "Convert string to filesize",
example: "echo '2' | into filesize",
result: Some(vec![UntaggedValue::filesize(2).into()]),
},
Example {
description: "Convert decimal to filesize",
example: "echo 8.3 | into filesize",
result: Some(vec![UntaggedValue::filesize(8).into()]),
},
Example {
description: "Convert int to filesize",
example: "echo 5 | into filesize",
result: Some(vec![UntaggedValue::filesize(5).into()]),
},
Example {
description: "Convert file size to filesize",
example: "echo 4KB | into filesize",
result: Some(vec![UntaggedValue::filesize(4000).into()]),
},
]
}
}
fn into_filesize(args: CommandArgs) -> Result<OutputStream, ShellError> {
let column_paths: Vec<ColumnPath> = args.rest(0)?;
Ok(args
.input
.map(move |v| {
if column_paths.is_empty() {
action(&v, v.tag())
} 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())),
)?;
}
Ok(ret)
}
})
.into_input_stream())
}
pub fn action(input: &Value, tag: impl Into<Tag>) -> Result<Value, ShellError> {
let tag = tag.into();
match &input.value {
UntaggedValue::Primitive(prim) => Ok(UntaggedValue::filesize(match prim {
Primitive::String(a_string) => match int_from_string(a_string.trim(), &tag) {
Ok(n) => n,
Err(e) => {
return Err(e);
}
},
Primitive::Decimal(dec) => match dec.to_bigint() {
Some(n) => match n.to_u64() {
Some(i) => i,
None => {
return Err(ShellError::unimplemented(
"failed to convert decimal to filesize",
));
}
},
None => {
return Err(ShellError::unimplemented(
"failed to convert decimal to filesize",
));
}
},
Primitive::Int(n_ref) => (*n_ref).try_into().map_err(|_| {
ShellError::unimplemented("cannot convert negative integer to filesize")
})?,
Primitive::Filesize(a_filesize) => *a_filesize,
_ => {
return Err(ShellError::unimplemented(
"'into filesize' for non-numeric primitives",
))
}
})
.into_value(&tag)),
UntaggedValue::Row(_) => Err(ShellError::labeled_error(
"specify column name to use, with 'into filesize COLUMN'",
"found table",
tag,
)),
_ => Err(ShellError::unimplemented(
"'into filesize' for unsupported type",
)),
}
}
fn int_from_string(a_string: &str, tag: &Tag) -> Result<u64, ShellError> {
match a_string.parse::<u64>() {
Ok(n) => Ok(n),
Err(_) => match a_string.parse::<f64>() {
Ok(f) => match f.to_u64() {
Some(i) => Ok(i),
None => Err(ShellError::labeled_error(
"Could not convert string value to filesize",
"original value",
tag.clone(),
)),
},
Err(_) => Err(ShellError::labeled_error(
"Could not convert string value to filesize",
"original value",
tag.clone(),
)),
},
}
}
#[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 {})
}
}
