forked from extern/nushell
193b00764b
* Moves off of draining between filters. Instead, the sink will pull on the stream, and will drain element-wise. This moves the whole stream to being lazy. * Adds ctrl-c support and connects it into some of the key points where we pull on the stream. If a ctrl-c is detect, we immediately halt pulling on the stream and return to the prompt. * Moves away from having a SourceMap where anchor locations are stored. Now AnchorLocation is kept directly in the Tag. * To make this possible, split tag and span. Span is largely used in the parser and is copyable. Tag is now no longer copyable.
83 lines
2.1 KiB
Rust
83 lines
2.1 KiB
Rust
use crate::commands::WholeStreamCommand;
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use crate::data::{TaggedDictBuilder, Value};
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use crate::errors::ShellError;
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use crate::prelude::*;
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pub struct Size;
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impl WholeStreamCommand for Size {
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fn name(&self) -> &str {
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"size"
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}
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fn signature(&self) -> Signature {
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Signature::build("size")
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}
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fn usage(&self) -> &str {
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"Gather word count statistics on the text."
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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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size(args, registry)
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}
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}
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fn size(args: CommandArgs, _registry: &CommandRegistry) -> Result<OutputStream, ShellError> {
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let input = args.input;
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let tag = args.call_info.name_tag;
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Ok(input
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.values
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.map(move |v| match v.item {
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Value::Primitive(Primitive::String(ref s)) => ReturnSuccess::value(count(s, v.tag())),
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_ => Err(ShellError::labeled_error_with_secondary(
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"Expected a string from pipeline",
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"requires string input",
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&tag,
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"value originates from here",
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v.tag(),
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)),
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})
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.to_output_stream())
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}
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fn count(contents: &str, tag: impl Into<Tag>) -> Tagged<Value> {
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let mut lines: i64 = 0;
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let mut words: i64 = 0;
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let mut chars: i64 = 0;
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let bytes = contents.len() as i64;
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let mut end_of_word = true;
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for c in contents.chars() {
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chars += 1;
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match c {
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'\n' => {
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lines += 1;
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end_of_word = true;
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}
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' ' => end_of_word = true,
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_ => {
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if end_of_word {
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words += 1;
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}
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end_of_word = false;
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}
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}
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}
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let mut dict = TaggedDictBuilder::new(tag);
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//TODO: add back in name when we have it in the tag
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//dict.insert("name", Value::string(name));
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dict.insert("lines", Value::int(lines));
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dict.insert("words", Value::int(words));
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dict.insert("chars", Value::int(chars));
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dict.insert("max length", Value::int(bytes));
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dict.into_tagged_value()
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}
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