2015-08-30 21:10:26 +00:00
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#[cfg(feature = "suggestions")]
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use strsim;
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2015-11-09 08:48:49 +00:00
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use fmt::Format;
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2015-08-30 21:10:26 +00:00
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/// Produces a string from a given list of possible values which is similar to
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/// the passed in value `v` with a certain confidence.
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/// Thus in a list of possible values like ["foo", "bar"], the value "fop" will yield
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/// `Some("foo")`, whereas "blark" would yield `None`.
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#[cfg(feature = "suggestions")]
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#[cfg_attr(feature = "lints", allow(needless_lifetimes))]
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2015-10-28 14:23:59 +00:00
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pub fn did_you_mean<'a, T, I>(v: &str, possible_values: I) -> Option<&'a str>
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2015-09-07 01:07:46 +00:00
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where T: AsRef<str> + 'a,
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I: IntoIterator<Item = &'a T>
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{
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2015-08-30 21:10:26 +00:00
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let mut candidate: Option<(f64, &str)> = None;
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for pv in possible_values.into_iter() {
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let confidence = strsim::jaro_winkler(v, pv.as_ref());
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2015-09-07 01:07:46 +00:00
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if confidence > 0.8 &&
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(candidate.is_none() || (candidate.as_ref().unwrap().0 < confidence)) {
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2015-08-30 21:10:26 +00:00
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candidate = Some((confidence, pv.as_ref()));
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}
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}
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match candidate {
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None => None,
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Some((_, candidate)) => Some(candidate),
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}
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}
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#[cfg(not(feature = "suggestions"))]
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2015-10-28 14:23:59 +00:00
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pub fn did_you_mean<'a, T, I>(_: &str, _: I) -> Option<&'a str>
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2015-09-07 01:07:46 +00:00
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where T: AsRef<str> + 'a,
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I: IntoIterator<Item = &'a T>
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{
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2015-08-30 21:10:26 +00:00
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None
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}
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2015-11-09 08:48:49 +00:00
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/// Returns a suffix that can be empty, or is the standard 'did you mean phrase
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#[cfg_attr(feature = "lints", allow(needless_lifetimes))]
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pub fn did_you_mean_suffix<'z, T, I>(arg: &str,
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values: I,
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style: DidYouMeanMessageStyle)
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-> (String, Option<&'z str>)
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where T: AsRef<str> + 'z,
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I: IntoIterator<Item = &'z T>
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{
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match did_you_mean(arg, values) {
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Some(candidate) => {
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let mut suffix = "\n\tDid you mean ".to_owned();
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match style {
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DidYouMeanMessageStyle::LongFlag =>
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suffix.push_str(&*format!("{}", Format::Good("--"))),
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DidYouMeanMessageStyle::EnumValue => suffix.push('\''),
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}
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suffix.push_str(&Format::Good(candidate).to_string()[..]);
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if let DidYouMeanMessageStyle::EnumValue = style {
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suffix.push('\'');
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}
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suffix.push_str(" ?");
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(suffix, Some(candidate))
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}
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None => (String::new(), None),
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}
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}
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2015-08-30 21:10:26 +00:00
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/// A helper to determine message formatting
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pub enum DidYouMeanMessageStyle {
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/// Suggested value is a long flag
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LongFlag,
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/// Suggested value is one of various possible values
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EnumValue,
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2015-09-04 15:59:55 +00:00
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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fn did_you_mean_possible_values() {
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let p_vals = ["test", "possible", "values"];
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assert_eq!(did_you_mean("tst", p_vals.iter()), Some("test"));
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assert!(did_you_mean("hahaahahah", p_vals.iter()).is_none());
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}
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2015-09-07 01:07:46 +00:00
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}
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