r/repl/
prompt.rs

1//! Custom R prompt for the REPL.
2//!
3//! Shows `> ` as the primary prompt and `+ ` as the multiline continuation,
4//! matching R's standard prompt style.
5
6use std::borrow::Cow;
7
8use reedline::{Color, Prompt, PromptEditMode, PromptHistorySearch, PromptHistorySearchStatus};
9
10pub struct RPrompt;
11
12impl Prompt for RPrompt {
13    fn render_prompt_left(&self) -> Cow<'_, str> {
14        Cow::Borrowed("")
15    }
16
17    fn render_prompt_right(&self) -> Cow<'_, str> {
18        Cow::Borrowed("")
19    }
20
21    fn render_prompt_indicator(&self, _prompt_mode: PromptEditMode) -> Cow<'_, str> {
22        Cow::Borrowed("> ")
23    }
24
25    fn render_prompt_multiline_indicator(&self) -> Cow<'_, str> {
26        Cow::Borrowed("+ ")
27    }
28
29    fn render_prompt_history_search_indicator(
30        &self,
31        history_search: PromptHistorySearch,
32    ) -> Cow<'_, str> {
33        let prefix = match history_search.status {
34            PromptHistorySearchStatus::Passing => "",
35            PromptHistorySearchStatus::Failing => "failing ",
36        };
37        Cow::Owned(format!(
38            "({}reverse-search: {}) ",
39            prefix, history_search.term
40        ))
41    }
42
43    fn get_prompt_color(&self) -> Color {
44        Color::Reset
45    }
46
47    fn get_indicator_color(&self) -> Color {
48        Color::Reset
49    }
50
51    fn get_prompt_multiline_color(&self) -> nu_ansi_term::Color {
52        nu_ansi_term::Color::Default
53    }
54}
r/repl/prompt.rs

r/repl/
prompt.rs
