strop-editor 0.1.2

strop — a modal text editor in Rust: see the cut before you make it
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//! Which-key overlay (0003 §3): shows while a leader prefix pends.
//! v1 covers the Space namespace statically; the coverage-tested,
//! binding-table-driven version lands with the keymap tables (0003 §5.7).

use ratatui::layout::Rect;
use ratatui::style::{Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, BorderType, Borders, Clear, Paragraph};
use ratatui::Frame;

use crate::editor::Editor;

use super::{ACCENT, BASE, MUTED, TEXT};

/// The Space namespace, as it will exist: available now vs. planned.
const SPACE_HINTS: &[(&str, &str, bool)] = &[
    ("f", "file finder", true),
    ("b", "buffers (MRU)", true),
    ("/", "live grep", true),
    ("j", "jumplist", false),
    ("s", "symbols", false),
    ("u", "undo tree", false),
    ("g", "git…", true),
];

const GIT_HINTS: &[(&str, &str, bool)] = &[
    ("u", "undo hunk (reset to HEAD)", true),
    ("s", "stage hunk", true),
    ("p", "preview hunk", true),
    ("l", "commit browser", false),
    ("h", "file history", false),
    ("b", "blame", false),
    ("y", "copy permalink", false),
];

pub fn render_which_key(editor: &Editor, frame: &mut Frame) {
    if editor.picker_open() {
        return;
    }
    if editor.pending == " g" {
        return render_hints(frame, " space g ", GIT_HINTS);
    }
    if editor.pending != " " {
        return;
    }
    render_hints(frame, " space ", SPACE_HINTS);
}

fn render_hints(frame: &mut Frame, title: &str, hints: &[(&str, &str, bool)]) {
    let area = frame.area();
    let width = 40u16.min(area.width.saturating_sub(4));
    let height = (hints.len() as u16 + 2).min(area.height.saturating_sub(2));
    let card = Rect {
        x: area.width.saturating_sub(width + 2),
        y: area.height.saturating_sub(height + 2),
        width,
        height,
    };
    frame.render_widget(Clear, card);
    let block = Block::default()
        .borders(Borders::ALL)
        .border_type(BorderType::Rounded)
        .border_style(Style::default().fg(MUTED))
        .style(Style::default().bg(BASE))
        .title(Span::styled(
            title,
            Style::default().fg(TEXT).add_modifier(Modifier::BOLD),
        ));
    let inner = block.inner(card);
    frame.render_widget(block, card);

    let lines: Vec<Line> = hints
        .iter()
        .map(|(key, desc, available)| {
            let key_style = if *available {
                Style::default().fg(ACCENT).add_modifier(Modifier::BOLD)
            } else {
                Style::default().fg(MUTED)
            };
            let desc_style = if *available {
                Style::default().fg(TEXT)
            } else {
                Style::default().fg(MUTED)
            };
            let suffix = if *available { "" } else { "  (soon)" };
            Line::from(vec![
                Span::raw(" "),
                Span::styled(format!(" {key} "), key_style.bg(super::SELECT_BG)),
                Span::styled(format!("  {desc}{suffix}"), desc_style),
            ])
        })
        .collect();
    frame.render_widget(Paragraph::new(lines), inner);
}