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https://github.com/nushell/nushell
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nibon7
GitHub
parent
fa5aab8170
commit
746641edae
3 changed files with 372 additions and 0 deletions
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@ -298,6 +298,7 @@ pub fn create_default_context(cwd: impl AsRef<Path>) -> EngineState {
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// Generators
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bind_command! {
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Cal,
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Seq,
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SeqDate,
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};
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@ -1,5 +1,7 @@
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mod cal;
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mod seq;
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mod seq_date;
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pub use cal::Cal;
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pub use seq::Seq;
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pub use seq_date::SeqDate;
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369
crates/nu-command/src/generators/seq.rs
Normal file
369
crates/nu-command/src/generators/seq.rs
Normal file
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@ -0,0 +1,369 @@
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use nu_engine::CallExt;
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use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, IntoPipelineData, PipelineData, ShellError, Signature, Span, Spanned,
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SyntaxShape, Value,
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};
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use std::cmp;
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#[derive(Clone)]
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pub struct Seq;
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impl Command for Seq {
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fn name(&self) -> &str {
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"seq"
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}
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fn signature(&self) -> Signature {
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Signature::build("seq")
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.rest("rest", SyntaxShape::Number, "sequence values")
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.named(
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"separator",
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SyntaxShape::String,
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"separator character (defaults to \\n)",
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Some('s'),
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)
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.named(
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"terminator",
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SyntaxShape::String,
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"terminator character (defaults to \\n)",
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Some('t'),
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)
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.switch(
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"widths",
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"equalize widths of all numbers by padding with zeros",
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Some('w'),
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)
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.category(Category::Generators)
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}
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fn usage(&self) -> &str {
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"Print sequences of numbers."
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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_input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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seq(engine_state, stack, call)
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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: "sequence 1 to 10 with newline separator",
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example: "seq 1 10",
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result: Some(Value::List {
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vals: vec![
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Value::test_int(1),
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Value::test_int(2),
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Value::test_int(3),
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Value::test_int(4),
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Value::test_int(5),
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Value::test_int(6),
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Value::test_int(7),
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Value::test_int(8),
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Value::test_int(9),
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Value::test_int(10),
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],
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span: Span::test_data(),
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}),
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},
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Example {
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description: "sequence 1.0 to 2.0 by 0.1s with newline separator",
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example: "seq 1.0 0.1 2.0",
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result: Some(Value::List {
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vals: vec![
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Value::test_float(1.0000),
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Value::test_float(1.1000),
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Value::test_float(1.2000),
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Value::test_float(1.3000),
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Value::test_float(1.4000),
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Value::test_float(1.5000),
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Value::test_float(1.6000),
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Value::test_float(1.7000),
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Value::test_float(1.8000),
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Value::test_float(1.9000),
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Value::test_float(2.0000),
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],
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span: Span::test_data(),
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}),
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},
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Example {
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description: "sequence 1 to 10 with pipe separator",
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example: "seq -s '|' 1 10",
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result: Some(Value::test_string("1|2|3|4|5|6|7|8|9|10")),
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},
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Example {
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description: "sequence 1 to 10 with pipe separator padded with 0",
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example: "seq -s '|' -w 1 10",
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result: Some(Value::test_string("01|02|03|04|05|06|07|08|09|10")),
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},
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Example {
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description: "sequence 1 to 10 with pipe separator padded by 2s",
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example: "seq -s ' | ' -w 1 2 10",
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result: Some(Value::test_string("01 | 03 | 05 | 07 | 09")),
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},
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]
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}
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}
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fn seq(
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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) -> Result<PipelineData, ShellError> {
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let span = call.head;
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let rest_nums: Vec<Spanned<f64>> = call.rest(engine_state, stack, 0)?;
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let separator: Option<Spanned<String>> = call.get_flag(engine_state, stack, "separator")?;
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let terminator: Option<Spanned<String>> = call.get_flag(engine_state, stack, "terminator")?;
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let widths = call.has_flag("widths");
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if rest_nums.is_empty() {
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return Err(ShellError::SpannedLabeledError(
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"seq requires some parameters".into(),
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"needs parameter".into(),
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call.head,
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));
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}
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let sep: String = match separator {
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Some(s) => {
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if s.item == r"\t" {
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'\t'.to_string()
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} else if s.item == r"\n" {
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'\n'.to_string()
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} else if s.item == r"\r" {
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'\r'.to_string()
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} else {
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let vec_s: Vec<char> = s.item.chars().collect();
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if vec_s.is_empty() {
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return Err(ShellError::SpannedLabeledError(
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"Expected a single separator char from --separator".into(),
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"requires a single character string input".into(),
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s.span,
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));
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};
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vec_s.iter().collect()
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}
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}
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_ => '\n'.to_string(),
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};
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let term: String = match terminator {
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Some(t) => {
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if t.item == r"\t" {
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'\t'.to_string()
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} else if t.item == r"\n" {
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'\n'.to_string()
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} else if t.item == r"\r" {
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'\r'.to_string()
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} else {
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let vec_t: Vec<char> = t.item.chars().collect();
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if vec_t.is_empty() {
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return Err(ShellError::SpannedLabeledError(
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"Expected a single terminator char from --terminator".into(),
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"requires a single character string input".into(),
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t.span,
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));
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};
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vec_t.iter().collect()
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}
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}
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_ => '\n'.to_string(),
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};
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let rest_nums: Vec<String> = rest_nums.iter().map(|n| n.item.to_string()).collect();
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run_seq(sep, Some(term), widths, rest_nums, span)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_examples() {
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use crate::test_examples;
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test_examples(Seq {})
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}
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}
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fn parse_float(mut s: &str) -> Result<f64, String> {
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if s.starts_with('+') {
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s = &s[1..];
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}
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match s.parse() {
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Ok(n) => Ok(n),
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Err(e) => Err(format!(
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"seq: invalid floating point argument `{}`: {}",
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s, e
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)),
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}
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}
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fn escape_sequences(s: &str) -> String {
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s.replace("\\n", "\n").replace("\\t", "\t")
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}
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pub fn run_seq(
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sep: String,
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termy: Option<String>,
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widths: bool,
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free: Vec<String>,
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span: Span,
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) -> Result<PipelineData, ShellError> {
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let mut largest_dec = 0;
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let mut padding = 0;
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let first = if free.len() > 1 {
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let slice = &free[0][..];
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let len = slice.len();
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let dec = slice.find('.').unwrap_or(len);
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largest_dec = len - dec;
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padding = dec;
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match parse_float(slice) {
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Ok(n) => n,
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Err(s) => return Err(ShellError::LabeledError(s, "error parsing float".into())),
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}
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} else {
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1.0
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};
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let step = if free.len() > 2 {
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let slice = &free[1][..];
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let len = slice.len();
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let dec = slice.find('.').unwrap_or(len);
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largest_dec = cmp::max(largest_dec, len - dec);
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padding = cmp::max(padding, dec);
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match parse_float(slice) {
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Ok(n) => n,
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Err(s) => return Err(ShellError::LabeledError(s, "error parsing float".into())),
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}
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} else {
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1.0
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};
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let last = {
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let slice = &free[free.len() - 1][..];
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padding = cmp::max(padding, slice.find('.').unwrap_or_else(|| slice.len()));
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match parse_float(slice) {
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Ok(n) => n,
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Err(s) => {
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return Err(ShellError::LabeledError(s, "error parsing float".into()));
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}
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}
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};
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if largest_dec > 0 {
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largest_dec -= 1;
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}
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let separator = escape_sequences(&sep[..]);
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let terminator = match termy {
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Some(term) => escape_sequences(&term[..]),
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None => separator.clone(),
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};
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Ok(print_seq(
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first,
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step,
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last,
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largest_dec,
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separator,
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terminator,
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widths,
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padding,
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span,
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))
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}
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fn done_printing(next: f64, step: f64, last: f64) -> bool {
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if step >= 0f64 {
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next > last
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} else {
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next < last
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}
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}
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#[allow(clippy::too_many_arguments)]
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fn print_seq(
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first: f64,
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step: f64,
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last: f64,
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largest_dec: usize,
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separator: String,
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terminator: String,
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pad: bool,
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padding: usize,
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span: Span,
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) -> PipelineData {
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let mut i = 0isize;
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let mut value = first + i as f64 * step;
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// for string output
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let mut ret_str = "".to_owned();
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// for number output
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let mut ret_num = vec![];
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// If the separator and terminator are line endings we can convert to numbers
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let use_num =
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(separator == "\n" || separator == "\r") && (terminator == "\n" || terminator == "\r");
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while !done_printing(value, step, last) {
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if use_num {
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ret_num.push(value);
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} else {
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// formatting for string output with potential padding
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let istr = format!("{:.*}", largest_dec, value);
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let ilen = istr.len();
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let before_dec = istr.find('.').unwrap_or(ilen);
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if pad && before_dec < padding {
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for _ in 0..(padding - before_dec) {
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ret_str.push('0');
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}
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}
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ret_str.push_str(&istr);
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}
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i += 1;
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value = first + i as f64 * step;
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if !done_printing(value, step, last) {
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ret_str.push_str(&separator);
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}
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}
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if !use_num && ((first >= last && step < 0f64) || (first <= last && step > 0f64)) {
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ret_str.push_str(&terminator);
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}
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if use_num {
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// we'd like to keep the datatype the same for the output, so check
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// and see if any of the output is really decimals, and if it is
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// we'll make the entire output decimals
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let contains_decimals = vec_contains_decimals(&ret_num);
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let rows: Vec<Value> = ret_num
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.iter()
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.map(|v| {
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if contains_decimals {
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Value::float(*v, span)
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} else {
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Value::int(*v as i64, span)
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}
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})
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.collect();
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Value::List { vals: rows, span }.into_pipeline_data()
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} else {
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let rows: String = ret_str.lines().collect();
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Value::string(rows, span).into_pipeline_data()
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}
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}
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fn vec_contains_decimals(array: &[f64]) -> bool {
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let mut found_decimal = false;
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for x in array {
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if x.fract() != 0.0 {
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found_decimal = true;
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break;
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}
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}
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found_decimal
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}
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