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https://github.com/nushell/nushell
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Merge pull request #835 from t-hart/from-ssv/variable-separator
`from-ssv`: user-defined number of spaces to split on
This commit is contained in:
Jonathan Turner
GitHub
commit
7d3025176f
3 changed files with 103 additions and 12 deletions
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@ -284,7 +284,7 @@ Nu adheres closely to a set of goals that make up its design philosophy. As feat
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| from-ini | Parse text as .ini and create table |
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| from-json | Parse text as .json and create table |
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| from-sqlite | Parse binary data as sqlite .db and create table |
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| from-ssv | Parse text as whitespace-separated values and create table|
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| from-ssv --minimum-spaces <minimum number of spaces to count as a separator> | Parse text as space-separated values and create table |
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| from-toml | Parse text as .toml and create table |
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| from-tsv | Parse text as .tsv and create table |
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| from-url | Parse urlencoded string and create a table |
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@ -7,9 +7,12 @@ pub struct FromSSV;
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#[derive(Deserialize)]
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pub struct FromSSVArgs {
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headerless: bool,
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#[serde(rename(deserialize = "minimum-spaces"))]
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minimum_spaces: Option<Tagged<usize>>,
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}
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const STRING_REPRESENTATION: &str = "from-ssv";
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const DEFAULT_MINIMUM_SPACES: usize = 2;
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impl WholeStreamCommand for FromSSV {
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fn name(&self) -> &str {
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@ -17,11 +20,13 @@ impl WholeStreamCommand for FromSSV {
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}
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fn signature(&self) -> Signature {
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Signature::build(STRING_REPRESENTATION).switch("headerless")
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Signature::build(STRING_REPRESENTATION)
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.switch("headerless")
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.named("minimum-spaces", SyntaxShape::Int)
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}
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fn usage(&self) -> &str {
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"Parse text as whitespace-separated values and create a table."
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"Parse text as space-separated values and create a table. The default minimum number of spaces counted as a separator is 2."
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}
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fn run(
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@ -33,12 +38,19 @@ impl WholeStreamCommand for FromSSV {
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}
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}
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fn string_to_table(s: &str, headerless: bool) -> Option<Vec<Vec<(String, String)>>> {
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fn string_to_table(
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s: &str,
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headerless: bool,
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split_at: usize,
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) -> Option<Vec<Vec<(String, String)>>> {
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let mut lines = s.lines().filter(|l| !l.trim().is_empty());
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let separator = " ".repeat(std::cmp::max(split_at, 1));
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let headers = lines
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.next()?
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.split_whitespace()
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.split(&separator)
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.map(|s| s.trim())
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.filter(|s| !s.is_empty())
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.map(|s| s.to_owned())
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.collect::<Vec<String>>();
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@ -55,7 +67,11 @@ fn string_to_table(s: &str, headerless: bool) -> Option<Vec<Vec<(String, String)
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.map(|l| {
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header_row
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.iter()
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.zip(l.split_whitespace())
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.zip(
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l.split(&separator)
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.map(|s| s.trim())
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.filter(|s| !s.is_empty()),
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)
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.map(|(a, b)| (String::from(a), String::from(b)))
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.collect()
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})
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@ -66,10 +82,11 @@ fn string_to_table(s: &str, headerless: bool) -> Option<Vec<Vec<(String, String)
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fn from_ssv_string_to_value(
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s: &str,
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headerless: bool,
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split_at: usize,
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tag: impl Into<Tag>,
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) -> Option<Tagged<Value>> {
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let tag = tag.into();
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let rows = string_to_table(s, headerless)?
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let rows = string_to_table(s, headerless, split_at)?
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.iter()
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.map(|row| {
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let mut tagged_dict = TaggedDictBuilder::new(&tag);
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@ -87,13 +104,20 @@ fn from_ssv_string_to_value(
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}
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fn from_ssv(
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FromSSVArgs { headerless }: FromSSVArgs,
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FromSSVArgs {
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headerless,
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minimum_spaces,
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}: FromSSVArgs,
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RunnableContext { input, name, .. }: RunnableContext,
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) -> Result<OutputStream, ShellError> {
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let stream = async_stream! {
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let values: Vec<Tagged<Value>> = input.values.collect().await;
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let mut concat_string = String::new();
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let mut latest_tag: Option<Tag> = None;
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let split_at = match minimum_spaces {
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Some(number) => number.item,
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None => DEFAULT_MINIMUM_SPACES
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};
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for value in values {
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let value_tag = value.tag();
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@ -112,7 +136,7 @@ fn from_ssv(
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}
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}
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match from_ssv_string_to_value(&concat_string, headerless, name.clone()) {
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match from_ssv_string_to_value(&concat_string, headerless, split_at, name.clone()) {
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Some(x) => match x {
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Tagged { item: Value::Table(list), ..} => {
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for l in list { yield ReturnSuccess::value(l) }
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@ -151,7 +175,7 @@ mod tests {
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3 4
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"#;
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let result = string_to_table(input, false);
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let result = string_to_table(input, false, 1);
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assert_eq!(
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result,
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Some(vec![
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@ -168,7 +192,7 @@ mod tests {
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1 2
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3 4
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"#;
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let result = string_to_table(input, true);
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let result = string_to_table(input, true, 1);
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assert_eq!(
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result,
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Some(vec![
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@ -181,7 +205,46 @@ mod tests {
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#[test]
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fn it_returns_none_given_an_empty_string() {
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let input = "";
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let result = string_to_table(input, true);
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let result = string_to_table(input, true, 1);
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assert_eq!(result, None);
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}
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#[test]
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fn it_allows_a_predefined_number_of_spaces() {
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let input = r#"
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column a column b
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entry 1 entry number 2
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3 four
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"#;
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let result = string_to_table(input, false, 3);
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assert_eq!(
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result,
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Some(vec![
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vec![
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owned("column a", "entry 1"),
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owned("column b", "entry number 2")
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],
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vec![owned("column a", "3"), owned("column b", "four")]
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])
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);
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}
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#[test]
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fn it_trims_remaining_separator_space() {
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let input = r#"
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colA colB colC
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val1 val2 val3
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"#;
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let trimmed = |s: &str| s.trim() == s;
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let result = string_to_table(input, false, 2).unwrap();
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assert_eq!(
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true,
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result
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.iter()
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.all(|row| row.iter().all(|(a, b)| trimmed(a) && trimmed(b)))
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)
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}
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}
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@ -383,6 +383,34 @@ fn converts_from_ssv_text_to_structured_table() {
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})
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}
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#[test]
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fn converts_from_ssv_text_to_structured_table_with_separator_specified() {
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Playground::setup("filter_from_ssv_test_1", |dirs, sandbox| {
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sandbox.with_files(vec![FileWithContentToBeTrimmed(
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"oc_get_svc.txt",
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r#"
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NAME LABELS SELECTOR IP PORT(S)
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docker-registry docker-registry=default docker-registry=default 172.30.78.158 5000/TCP
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kubernetes component=apiserver,provider=kubernetes <none> 172.30.0.2 443/TCP
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kubernetes-ro component=apiserver,provider=kubernetes <none> 172.30.0.1 80/TCP
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"#,
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)]);
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let actual = nu!(
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cwd: dirs.test(), h::pipeline(
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r#"
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open oc_get_svc.txt
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| from-ssv --minimum-spaces 3
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| nth 0
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| get IP
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| echo $it
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"#
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));
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assert_eq!(actual, "172.30.78.158");
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})
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}
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#[test]
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fn converts_from_ssv_text_skipping_headers_to_structured_table() {
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Playground::setup("filter_from_ssv_test_2", |dirs, sandbox| {
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