Create command line interface 💻

Cargo.toml

@@ -11,3 +11,7 @@ unicode-segmentation = "1.2"
 unicode-xid = "0.1.0"
 byteorder = "1"
 smallvec = "0.6.9"
+
+[[bin]]
+name = "typst"
+path = "src/bin/main.rs"

src/bin/main.rs

@@ -0,0 +1,72 @@
+use std::env;
+use std::fs::File;
+use std::error::Error;
+use std::process;
+use std::io::Read;
+use std::path::{Path, PathBuf};
+
+use typeset::Compiler;
+use typeset::{font::FileSystemFontProvider, font_info};
+use typeset::export::pdf::PdfExporter;
+
+
+fn run() -> Result<(), Box<Error>> {
+    let args: Vec<String> = env::args().collect();
+    if args.len() < 2 || args.len() > 3 {
+        help_and_quit();
+    }
+
+    // Open the input file.
+    let mut file = File::open(&args[1]).map_err(|_| "failed to open source file")?;
+
+    // The output file name.
+    let output_filename = if args.len() <= 2 {
+        let source_path = Path::new(&args[1]);
+        let stem = source_path.file_stem().ok_or_else(|| "missing destation file name")?;
+        let base = source_path.parent().ok_or_else(|| "missing destation folder")?;
+        base.join(format!("{}.pdf", stem.to_string_lossy()))
+    } else {
+        PathBuf::from(&args[2])
+    };
+
+    // Read the input file.
+    let mut src = String::new();
+    file.read_to_string(&mut src).map_err(|_| "failed to read from source file")?;
+
+    // Create a compiler with a font provider that provides three fonts
+    // (two sans-serif fonts and a fallback for the emoji).
+    let mut compiler = Compiler::new();
+    compiler.add_font_provider(FileSystemFontProvider::new("fonts", vec![
+        ("NotoSans-Regular.ttf",     font_info!(["NotoSans", "Noto", SansSerif])),
+        ("NotoSans-Italic.ttf",      font_info!(["NotoSans", "Noto", SansSerif], italic)),
+        ("NotoSans-Bold.ttf",        font_info!(["NotoSans", "Noto", SansSerif], bold)),
+        ("NotoSans-BoldItalic.ttf",  font_info!(["NotoSans", "Noto", SansSerif], italic, bold)),
+        ("NotoSansMath-Regular.ttf", font_info!(["NotoSansMath", "Noto", SansSerif])),
+        ("NotoEmoji-Regular.ttf",    font_info!(["NotoEmoji", "Noto", SansSerif, Serif, Monospace])),
+    ]));
+
+    // Compile the source code with the compiler.
+    let document = compiler.typeset(&src)?;
+
+
+    // Export the document into a PDF file.
+    let exporter = PdfExporter::new();
+    let output_file = File::create(&output_filename)?;
+    exporter.export(&document, output_file)?;
+
+    Ok(())
+}
+
+fn main() {
+    if let Err(err) = run() {
+        eprintln!("error: {}", err);
+        process::exit(1);
+    }
+}
+
+/// Print a usage message and quit.
+fn help_and_quit() {
+    let name = env::args().next().unwrap_or("help".to_string());
+    println!("usage: {} <source> [<destination>]", name);
+    process::exit(0);
+}