reedline/hinter/
default.rs

1use crate::{hinter::get_first_token, history::SearchQuery, Hinter, History};
2use nu_ansi_term::{Color, Style};
3
4/// A hinter that uses the completions or the history to show a hint to the user
5pub struct DefaultHinter {
6    style: Style,
7    current_hint: String,
8    min_chars: usize,
9}
10
11impl Hinter for DefaultHinter {
12    fn handle(
13        &mut self,
14        line: &str,
15        #[allow(unused_variables)] pos: usize,
16        history: &dyn History,
17        use_ansi_coloring: bool,
18    ) -> String {
19        self.current_hint = if line.chars().count() >= self.min_chars {
20            history
21                .search(SearchQuery::last_with_prefix(
22                    line.to_string(),
23                    history.session(),
24                ))
25                .expect("todo: error handling")
26                .first()
27                .map_or_else(String::new, |entry| {
28                    entry
29                        .command_line
30                        .get(line.len()..)
31                        .unwrap_or_default()
32                        .to_string()
33                })
34        } else {
35            String::new()
36        };
37
38        if use_ansi_coloring && !self.current_hint.is_empty() {
39            self.style.paint(&self.current_hint).to_string()
40        } else {
41            self.current_hint.clone()
42        }
43    }
44
45    fn complete_hint(&self) -> String {
46        self.current_hint.clone()
47    }
48
49    fn next_hint_token(&self) -> String {
50        get_first_token(&self.current_hint)
51    }
52}
53
54impl Default for DefaultHinter {
55    fn default() -> Self {
56        DefaultHinter {
57            style: Style::new().fg(Color::LightGray),
58            current_hint: String::new(),
59            min_chars: 1,
60        }
61    }
62}
63
64impl DefaultHinter {
65    /// A builder that sets the style applied to the hint as part of the buffer
66    #[must_use]
67    pub fn with_style(mut self, style: Style) -> Self {
68        self.style = style;
69        self
70    }
71
72    /// A builder that sets the number of characters that have to be present to enable history hints
73    #[must_use]
74    pub fn with_min_chars(mut self, min_chars: usize) -> Self {
75        self.min_chars = min_chars;
76        self
77    }
78}
reedline/hinter/default.rs

reedline/hinter/
default.rs
