Change: roadmap2dot to take input filename from command line

2 files changed, 21 insertions, 9 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 7500897..191e6ba 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,4 @@ edition = "2018"
 
 [dependencies]
 serde_yaml = "0.8.9"
+structopt = "0.3"
diff --git a/src/bin/roadmap2dot.rs b/src/bin/roadmap2dot.rs
index 599c178..bb27a5f 100644
--- a/src/bin/roadmap2dot.rs
+++ b/src/bin/roadmap2dot.rs
@@ -1,15 +1,26 @@
 use roadmap::Roadmap;
+use structopt::StructOpt;
+use std::path::PathBuf;
+use std::fs::File;
+use std::io::Read;
+
+#[derive(Debug, StructOpt)]
+#[structopt(name = "roadmap2dot", about = "Create a dot graph of a roadmap in YAML")]
+struct Opt {
+    // The input filename.
+    #[structopt(parse(from_os_str))]
+    filename: PathBuf,
+}
 
-fn main() {
-    let r = Roadmap::from_yaml("
-first:
-  label: first step
 
-second:
-  label: the second step
-  depends:
-  - first
-").unwrap();
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let opt = Opt::from_args();
+    let mut text = String::new();
+    let mut f = File::open(opt.filename)?;
+    f.read_to_string(&mut text)?;
 
+    let r = Roadmap::from_yaml(&text)?;
     println!("{}", r.as_dot().unwrap());
+
+    Ok(())
 }