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//! Writes what the page in web/ needs: hongo.js holds the wasm, and font.js holds the typefaces
//!
//! A page opened by double clicking cannot read the files next to it, so both are written as
//! base64 into scripts that the page loads.
//!
//! Usage:
//! cargo build --lib --release --target wasm32-unknown-unknown
//! cargo run --example web
//! cargo run --example web -- --font-japanese /path/to/mincho.otf --output ~/Desktop/hongo
use std::path::{Path, PathBuf};
/// The wasm that cargo builds
const WASM: &str = "target/wasm32-unknown-unknown/release/hongo.wasm";
/// The math typeface
const MATH: &str = "font/latinmodern-math.otf";
/// The directory that holds the page
const PAGE: &str = "web";
fn main() {
let mut argument: Vec<String> = std::env::args().skip(1).collect();
let japanese = take(&mut argument, "--font-japanese")
.map(PathBuf::from)
.or_else(|| any_font(Path::new(MATH)));
let output = take(&mut argument, "--output")
.map(PathBuf::from)
.unwrap_or_else(|| PathBuf::from(PAGE));
let wasm = read(
Path::new(WASM),
"build it first with cargo build --lib --release --target wasm32-unknown-unknown",
);
let math = read(Path::new(MATH), "the math typeface is needed");
let japanese_data = match &japanese {
Some(path) => read(path, "cannot read the typeface for Japanese text"),
None => {
eprintln!("no typeface for Japanese text, so Japanese will not appear. Put a Mincho typeface in font/ to set it");
Vec::new()
}
};
if let Err(reason) = std::fs::create_dir_all(&output) {
fail(&format!("cannot make {}: {reason}", output.display()));
}
copy_page(&output);
write(&output.join("hongo.js"), &format!("const hongoWasm = '{}'\n", base64(&wasm)));
write(
&output.join("font.js"),
&format!(
"// mathFont is Latin Modern Math from GUST, under the GUST Font License \
(GUST-FONT-LICENSE.txt)\nconst mathFont = '{}'\n\nconst japaneseFont = '{}'\n",
base64(&math),
base64(&japanese_data)
),
);
println!("wrote {}. Open index.html", output.display());
}
/// Takes out one option
fn take(argument: &mut Vec<String>, name: &str) -> Option<String> {
let at = argument.iter().position(|one| one == name)?;
if at + 1 >= argument.len() {
fail(&format!("{name} must be followed by a value"));
}
let value = argument.remove(at + 1);
argument.remove(at);
Some(value)
}
/// Looks for one typeface in font/ that is not the math typeface
fn any_font(except: &Path) -> Option<PathBuf> {
let mut found: Vec<PathBuf> = std::fs::read_dir("font")
.ok()?
.filter_map(|entry| entry.ok())
.map(|entry| entry.path())
.filter(|path| {
let suffix = path
.extension()
.and_then(|one| one.to_str())
.unwrap_or_default()
.to_lowercase();
matches!(suffix.as_str(), "otf" | "ttf" | "ttc") && path != except
})
.collect();
found.sort();
found.into_iter().next()
}
/// Copies the page and the license of the math typeface when the output is somewhere other than
/// web/
fn copy_page(output: &Path) {
let same = match (output.canonicalize(), Path::new(PAGE).canonicalize()) {
(Ok(left), Ok(right)) => left == right,
_ => false,
};
if same {
return;
}
for name in ["index.html", "GUST-FONT-LICENSE.txt"] {
if let Err(reason) = std::fs::copy(Path::new(PAGE).join(name), output.join(name)) {
fail(&format!("cannot copy {name}: {reason}"));
}
}
}
/// Reads a file. If it cannot be read, says so and stops
fn read(path: &Path, hint: &str) -> Vec<u8> {
match std::fs::read(path) {
Ok(data) => data,
Err(reason) => fail(&format!("cannot read {}: {reason}\n{hint}", path.display())),
}
}
/// Writes a file. If it cannot be written, says so and stops
fn write(path: &Path, body: &str) {
if let Err(reason) = std::fs::write(path, body) {
fail(&format!("cannot write {}: {reason}", path.display()));
}
}
/// Says what went wrong and stops
fn fail(message: &str) -> ! {
eprintln!("{message}");
std::process::exit(1)
}
/// Writes bytes in base64
fn base64(data: &[u8]) -> String {
const TABLE: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
let mut out = String::with_capacity(data.len().div_ceil(3) * 4);
for chunk in data.chunks(3) {
let value = ((chunk[0] as usize) << 16)
| ((chunk.get(1).copied().unwrap_or(0) as usize) << 8)
| (chunk.get(2).copied().unwrap_or(0) as usize);
out.push(TABLE[(value >> 18) & 63] as char);
out.push(TABLE[(value >> 12) & 63] as char);
out.push(if chunk.len() > 1 {TABLE[(value >> 6) & 63] as char} else {'='});
out.push(if chunk.len() > 2 {TABLE[value & 63] as char} else {'='});
}
out
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn bytes_become_base64() {
assert_eq!(base64(b""), "");
assert_eq!(base64(b"f"), "Zg==");
assert_eq!(base64(b"fo"), "Zm8=");
assert_eq!(base64(b"foo"), "Zm9v");
assert_eq!(base64(b"foobar"), "Zm9vYmFy");
}
}
