Monochromator

// Palette bundles the color values of a single mode (dark/light).
type Palette struct {
	BG     string `json:"bg"`
	FG     string `json:"fg"`
	Accent string `json:"accent"`
}

// Pick returns the dark or light value depending on the mode.
func Pick(mode, dark, light string) string {
	if mode == "dark" {
		return dark
	}
	return light
}

func (p Palette) Color(name string) (string, error) {
	switch name {
	case "blue":
		return p.Blue, nil
	case "magenta":
		return p.Magenta, nil
	default:
		return "", fmt.Errorf("unknown color %q", name)
	}
}

func Load(dir string) (*Config, error) {
	data, err := os.ReadFile(filepath.Join(dir, "base.json"))
	if err != nil {
		return nil, fmt.Errorf("loading base palette: %w", err)
	}
	var palettes map[string]Palette
	if err := json.Unmarshal(data, &palettes); err != nil {
		return nil, fmt.Errorf("parsing base palette: %w", err)
	}
	return &Config{Palettes: palettes}, nil
}

#[derive(Debug, Clone, PartialEq)]
pub struct Token {
    pub text: String,
    pub pos: usize,
}

/// A lexer over the beta-code apparatus.
pub struct Lexer<'a> {
    input: &'a str,
    pos: usize,
}

impl<'a> Lexer<'a> {
    pub fn new(input: &'a str) -> Self {
        Self { input, pos: 0 }
    }

    /// Converts a beta-code letter with its diacritics into Unicode.
    pub fn convert(&mut self, c: char) -> Result<char, ParseError> {
        self.pos += 1;
        match c {
            'a'..='z' => Ok(BASE[(c as u8 - b'a') as usize]),
            ')' => Ok('\u{0313}'),
            '(' => Ok('\u{0314}'),
            _ => Err(ParseError::new(
                self.pos,
                format!("unknown character {c:?}"),
            )),
        }
    }

    pub fn words(&self) -> impl Iterator<Item = &str> + '_ {
        self.input.split_whitespace().filter(|w| !w.is_empty())
    }
}

type Mode = "dark" | "light"

interface Verse {
  v: number
  t: string
}

interface Chapter {
  book: string
  vs: Verse[]
}

const CACHE = new Map<string, Chapter>()

/**
 * Loads a chapter from the static data store.
 * @param ref Canonical reference, e.g. "MT/5"
 */
export async function loadChapter(ref: string): Promise<Chapter | null> {
  const cached = CACHE.get(ref)
  if (cached !== undefined) return cached
  const res = await fetch(`/data/ntg/text/${ref}.json`)
  if (!res.ok) return null
  const data: Chapter = await res.json()
  CACHE.set(ref, data)
  return data
}

export function wordCount(ch: Chapter): number {
  return ch.vs
    .filter((verse) => verse.t !== "")
    .reduce((sum, verse) => sum + verse.t.split(/\s+/).length, 0)
}

#include <errno.h>
#include <stdio.h>
#include <string.h>

#define KEY_LEN 32

enum key_state { KEY_EMPTY = 0, KEY_LOADED, KEY_WIPED };

struct key {
    unsigned char bytes[KEY_LEN];
    enum key_state state;
};

int read_key(struct key *k, FILE *fp);

/* Zeroes the buffer before key material is released. */
static void bzero_explicit(unsigned char *buf, size_t len) {
    volatile unsigned char *p = buf;
    while (len--)
        *p++ = 0;
}

int main(void) {
    struct key k = { .state = KEY_EMPTY };
    if (read_key(&k, stdin) != 0) {
        fprintf(stderr, "no key: %s\n", strerror(errno));
        return 1;
    }
    printf("loaded: %d bytes\n", KEY_LEN);
    bzero_explicit(k.bytes, sizeof k.bytes);
    k.state = KEY_WIPED;
    return 0;
}

#include <algorithm>
#include <string>
#include <string_view>
#include <vector>

namespace ntg {

// A hit in the apparatus: position plus reading.
struct Hit {
    std::size_t pos;
    std::string reading;
};

template <typename Pred>
std::vector<Hit> collect(std::string_view text, Pred keep) {
    std::vector<Hit> hits;
    for (std::size_t i = 0; i < text.size(); ++i) {
        if (keep(text[i])) {
            hits.push_back({i, std::string{text[i]}});
        }
    }
    return hits;
}

constexpr auto is_sigla = [](char c) { return c == '*' || c == '#'; };

std::size_t count_sigla(std::string_view text) {
    auto hits = collect(text, is_sigla);
    std::sort(hits.begin(), hits.end(),
              [](const Hit& a, const Hit& b) { return a.pos < b.pos; });
    return hits.size();
}

} // namespace ntg

package at.beem.ntg;

import java.util.List;
import java.util.Objects;

/** A witness to the text: a manuscript siglum with its readings. */
public final class Witness {

    private static final String UNKNOWN = "\u2014";

    private final String siglum;
    private final List<String> readings;

    /**
     * Creates a witness.
     *
     * @param siglum the manuscript siglum, for example "P46"
     */
    public Witness(String siglum, List<String> readings) {
        this.siglum = Objects.requireNonNull(siglum);
        this.readings = List.copyOf(readings);
    }

    public String readingAt(int index) {
        if (index < 0 || index >= readings.size()) {
            return UNKNOWN;
        }
        return readings.get(index);
    }

    @Override
    public String toString() {
        return siglum + ": " + readings.size() + " readings";
    }
}

# Monochromator

Distraction-free **monochrome** theme for VS Code, Zed, Helix and Neovim.

## Installation

1. Open the Extensions view (`Ctrl+Shift+X`)
2. Search for *Monochromator*
3. Or install directly via [Open VSX](https://open-vsx.org/extension/beem/monochromator)

> For 100 % correct behavior, set `editor.bracketPairColorization.enabled`
> to `false`.

## Variants

| Variant | Accent |
|---------|--------|
| Default | Blue   |
| Ruby    | Red    |

Use \* to write a literal asterisk, ~~struck~~ works too.

% Minimal article: one lemma, one equation.
\documentclass[11pt]{article}
\usepackage{amsmath}
\usepackage{amsthm}

\newtheorem{lemma}{Lemma}
\title{On the Grating Equation}
\author{J. Beem}

\begin{document}
\maketitle

\section{Setup}
The wavelength follows from $m\lambda = d\sin\theta_m$, where $m$
is the diffraction order.

\begin{lemma}
For the sodium D line, $\lambda = 589.3\,\mathrm{nm}$.
\end{lemma}

\begin{equation}
  E = h\nu = \frac{hc}{\lambda}
\end{equation}

\end{document}