3 files changed, 47 insertions, 4 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,
+}
diff --git a/src/map.rs b/src/map.rs
index 3fe1e12..00b680f 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -2,7 +2,6 @@ use std::collections::HashMap;
 
 use textwrap::fill;
 
-pub use crate::from_yaml;
 pub use crate::RoadmapError;
 pub use crate::Status;
 pub use crate::Step;
@@ -220,7 +219,8 @@ impl Roadmap {
 
 #[cfg(test)]
 mod tests {
-    use super::{from_yaml, Roadmap, Status, Step};
+    use super::{Roadmap, Status, Step};
+    use crate::from_yaml;
 
     #[test]
     fn new_roadmap() {
diff --git a/src/parser.rs b/src/parser.rs
index 8c7a9c1..6b7d845 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,9 +1,7 @@
 use std::collections::HashMap;
 
 pub use crate::Roadmap;
-pub use crate::RoadmapError;
 pub use crate::RoadmapResult;
-pub use crate::Status;
 pub use crate::Step;
 
 /// Create a new roadmap from a textual YAML representation.