tmprl 0.1.0

A keyboard-driven terminal client for Temporal
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//! The confirmation that stands in front of every destructive action.
//!
//! It shows **the equivalent `temporal` CLI command**, which is the whole design: you read
//! exactly what is about to happen rather than trusting a verb, and if you would rather not
//! trust a TUI with it you can copy the line and run it yourself.

use ratatui::Frame;
use ratatui::style::{Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, Clear, Paragraph, Wrap};
use tmprl_core::mutation::Confirm;

use crate::theme::Theme;

/// How many targets a batch confirmation lists before summarising the rest.
const LISTED: usize = 8;

pub fn render(frame: &mut Frame, confirm: &Confirm, t: &Theme) {
    let m = confirm.first();
    // Destructive actions are outlined in the error colour. The border is doing real work
    // here: it is the difference between "this changes something" and "this ends it".
    let accent = if m.destroys_history() {
        t.err
    } else if m.is_destructive() {
        t.warn
    } else {
        t.accent
    };

    // A batch names the count, not one id: the number is what is at stake, and picking one
    // row's id to stand for twelve would understate it.
    let heading = if confirm.is_batch() {
        format!("  {} {} {}", m.verb(), confirm.len(), m.subject_plural())
    } else {
        format!("  {} {}", m.verb(), m.workflow_id())
    };
    let mut lines = vec![
        Line::from(Span::styled(
            heading,
            Style::new().fg(t.fg).add_modifier(Modifier::BOLD),
        )),
        Line::from(Span::styled(
            format!("  in {}", m.namespace()),
            Style::new().fg(t.dim),
        )),
    ];

    if confirm.is_batch() {
        lines.push(Line::raw(""));
        // Every target listed, up to a limit: a confirmation you cannot see the end of is
        // one you cannot check, and checking it is the point.
        for target in confirm.mutations.iter().take(LISTED) {
            lines.push(Line::from(Span::styled(
                format!("    {}", target.workflow_id()),
                Style::new().fg(t.dim),
            )));
        }
        if confirm.len() > LISTED {
            lines.push(Line::from(Span::styled(
                format!("    and {} more", confirm.len() - LISTED),
                Style::new().fg(t.faint),
            )));
        }
    }

    lines.push(Line::raw(""));
    lines.push(Line::from(Span::styled(
        if confirm.is_batch() {
            "  the equivalent command, for the first:"
        } else {
            "  the equivalent command:"
        },
        Style::new().fg(t.faint),
    )));
    // Wrapped rather than truncated: a command you can only see half of is not one you can
    // check, and checking it is the point.
    for chunk in wrap(&m.cli(), 66) {
        lines.push(Line::from(Span::styled(
            format!("    {chunk}"),
            Style::new().fg(t.ok),
        )));
    }
    lines.push(Line::raw(""));

    if let Some(word) = &confirm.typed_word {
        lines.push(Line::from(vec![
            Span::styled("  ", Style::new()),
            Span::styled(
                format!("{} ", confirm.caution().unwrap_or_default()),
                Style::new().fg(t.err).add_modifier(Modifier::BOLD),
            ),
            Span::styled(format!("type `{word}`:"), Style::new().fg(t.fg)),
        ]));
        lines.push(Line::from(vec![
            Span::styled("    ", Style::new()),
            Span::styled(confirm.entered.clone(), Style::new().fg(t.fg)),
            Span::styled("█", Style::new().fg(accent)),
        ]));
        lines.push(Line::raw(""));
    }
    lines.push(Line::from(Span::styled(
        format!("  {}", confirm.prompt()),
        Style::new().fg(t.faint),
    )));

    let height = (lines.len() as u16 + 2).min(frame.area().height);
    let area = super::centered(frame.area(), 74, height);
    if area.height < 3 || area.width < 20 {
        return;
    }

    frame.render_widget(Clear, area);
    frame.render_widget(
        Paragraph::new(lines).wrap(Wrap { trim: false }).block(
            Block::bordered()
                .borders(Borders::ALL)
                .title(Span::styled(
                    format!(" confirm, {} ", m.verb().to_lowercase()),
                    Style::new().fg(accent).add_modifier(Modifier::BOLD),
                ))
                .border_style(Style::new().fg(accent)),
        ),
        area,
    );
}

/// Break a long command on spaces so it can be read across several lines.
fn wrap(s: &str, width: usize) -> Vec<String> {
    let mut out = Vec::new();
    let mut line = String::new();
    for word in s.split(' ') {
        if !line.is_empty() && line.chars().count() + 1 + word.chars().count() > width {
            out.push(std::mem::take(&mut line));
        }
        if !line.is_empty() {
            line.push(' ');
        }
        line.push_str(word);
    }
    if !line.is_empty() {
        out.push(line);
    }
    out
}