Addd flag to list used template variables

manager/src/main.rs

@@ -4,11 +4,13 @@ extern crate log;
 mod builder;
 mod error;
 mod linker;
+mod peeker;
 
 use builder::build_tree;
 use error::Errors;
 use linker::link_tree;
 use log::LevelFilter;
+use peeker::peek_tree;
 use std::env;
 use std::path::PathBuf;
 use structopt::StructOpt;
@@ -24,6 +26,9 @@ struct Opt {
     #[structopt(short, long)]
     link_dir: Option<PathBuf>,
 
+    #[structopt(short, long)]
+    print_variables: bool,
+
     #[structopt(short, parse(from_occurrences))]
     verbosity: u8,
 
@@ -75,11 +80,16 @@ async fn run() -> Result<(), Errors> {
         flags: opt.flags,
     };
 
-    info!("building tree");
-    build_tree(&cfg).await?;
+    if opt.print_variables {
+        info!("peeking tree");
+        peek_tree(&cfg).await?;
+    } else {
+        info!("building tree");
+        build_tree(&cfg).await?;
 
-    info!("linking tree");
-    link_tree(&cfg).await?;
+        info!("linking tree");
+        link_tree(&cfg).await?;
+    }
 
     Ok(())
 }