mirror of
https://github.com/nushell/nushell
synced 2024-12-29 06:23:11 +00:00
e4226def16
This commit extracts five new crates:
- nu-source, which contains the core source-code handling logic in Nu,
including Text, Span, and also the pretty.rs-based debug logic
- nu-parser, which is the parser and expander logic
- nu-protocol, which is the bulk of the types and basic conveniences
used by plugins
- nu-errors, which contains ShellError, ParseError and error handling
conveniences
- nu-textview, which is the textview plugin extracted into a crate
One of the major consequences of this refactor is that it's no longer
possible to `impl X for Spanned<Y>` outside of the `nu-source` crate, so
a lot of types became more concrete (Value became a concrete type
instead of Spanned<Value>, for example).
This also turned a number of inherent methods in the main nu crate into
plain functions (impl Value {} became a bunch of functions in the
`value` namespace in `crate::data::value`).
74 lines
1.9 KiB
Rust
74 lines
1.9 KiB
Rust
use crate::commands::from_delimited_data::from_delimited_data;
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use crate::commands::WholeStreamCommand;
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use crate::prelude::*;
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use nu_errors::ShellError;
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use nu_protocol::{Primitive, Signature, SyntaxShape, UntaggedValue, Value};
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pub struct FromCSV;
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#[derive(Deserialize)]
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pub struct FromCSVArgs {
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headerless: bool,
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separator: Option<Value>,
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}
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impl WholeStreamCommand for FromCSV {
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fn name(&self) -> &str {
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"from-csv"
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}
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fn signature(&self) -> Signature {
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Signature::build("from-csv")
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.named(
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"separator",
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SyntaxShape::String,
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"a character to separate columns, defaults to ','",
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)
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.switch("headerless", "don't treat the first row as column names")
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}
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fn usage(&self) -> &str {
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"Parse text as .csv and create table."
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}
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fn run(
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&self,
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args: CommandArgs,
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registry: &CommandRegistry,
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) -> Result<OutputStream, ShellError> {
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args.process(registry, from_csv)?.run()
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}
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}
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fn from_csv(
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FromCSVArgs {
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headerless,
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separator,
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}: FromCSVArgs,
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runnable_context: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let sep = match separator {
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Some(Value {
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value: UntaggedValue::Primitive(Primitive::String(s)),
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tag,
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..
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}) => {
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if s == r"\t" {
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'\t'
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} else {
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let vec_s: Vec<char> = s.chars().collect();
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if vec_s.len() != 1 {
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return Err(ShellError::labeled_error(
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"Expected a single separator char from --separator",
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"requires a single character string input",
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tag,
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));
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};
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vec_s[0]
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}
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}
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_ => ',',
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};
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from_delimited_data(headerless, sep, "CSV", runnable_context)
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}
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