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https://github.com/nushell/nushell.git
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f70c6d5d48
This commit extracts Tag, Span, Text, as well as source-related debug facilities into a new crate called nu_source. This change is much bigger than one might have expected because the previous code relied heavily on implementing inherent methods on `Tagged<T>` and `Spanned<T>`, which is no longer possible. As a result, this change creates more concrete types instead of using `Tagged<T>`. One notable example: Tagged<Value> became Value, and Value became UntaggedValue. This change clarifies the intent of the code in many places, but it does make it a big change.
50 lines
1.4 KiB
Rust
50 lines
1.4 KiB
Rust
use crate::cli::History as HistoryFile;
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use crate::commands::PerItemCommand;
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use crate::errors::ShellError;
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use crate::parser::registry::{self};
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use crate::prelude::*;
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use std::fs::File;
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use std::io::{BufRead, BufReader};
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pub struct History;
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impl PerItemCommand for History {
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fn name(&self) -> &str {
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"history"
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}
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fn signature(&self) -> registry::Signature {
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Signature::build("history")
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}
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fn usage(&self) -> &str {
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"Display command history."
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}
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fn run(
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&self,
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call_info: &CallInfo,
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_registry: &CommandRegistry,
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_raw_args: &RawCommandArgs,
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_input: Value,
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) -> Result<OutputStream, ShellError> {
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let tag = call_info.name_tag.clone();
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let stream = async_stream! {
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let history_path = HistoryFile::path();
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let file = File::open(history_path);
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if let Ok(file) = file {
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let reader = BufReader::new(file);
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for line in reader.lines() {
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if let Ok(line) = line {
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yield ReturnSuccess::value(UntaggedValue::string(line).into_value(tag.clone()));
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}
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}
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} else {
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yield Err(ShellError::labeled_error("Could not open history", "history file could not be opened", tag.clone()));
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}
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};
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Ok(stream.to_output_stream())
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}
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}
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