feat: add a program to produce an SVG from a roadmap

Signed-off-by: Lars Wirzenius <liw@liw.fi>
Sponsored-by: author

1 files changed, 45 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..f4b3c33
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,45 @@
+use std::{
+    fs::{read, write},
+    path::PathBuf,
+    process::Command,
+};
+
+use clap::Parser;
+use tempfile::tempdir;
+
+use roadmap::from_yaml;
+
+fn main() -> anyhow::Result<()> {
+    let args = Args::parse();
+
+    let data = read(&args.filename)?;
+    let yaml = String::from_utf8(data)?;
+    let roadmap = from_yaml(&yaml)?;
+    let graph = roadmap.format_as_dot(args.label_width)?;
+
+    let tmp = tempdir()?;
+    let filename = tmp.path().join("dot");
+    write(&filename, graph)?;
+
+    let output = Command::new("dot").arg("-Tsvg").arg(filename).output()?;
+    if output.status.success() {
+        let dot = String::from_utf8(output.stdout)?;
+        println!("{}", dot);
+    } else {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        eprintln!("ERROR: dot failed:\n{stderr}");
+        std::process::exit(output.status.code().unwrap());
+    }
+
+    Ok(())
+}
+
+#[derive(Parser)]
+struct Args {
+    /// Width of labels in the graph in characters.
+    #[clap(short, long, default_value = "20")]
+    label_width: usize,
+
+    /// Input filename.
+    filename: PathBuf,
+}