From e8c25423b8a46aafb3e044ec5f97fe3e0eaf3e8c Mon Sep 17 00:00:00 2001
From: Casey Rodarmor <casey@rodarmor.com>
Date: Fri, 23 Aug 2019 20:45:57 -0700
Subject: [PATCH] Display alias with `--show NAME` if one exists

Given the following justfile:

    alias b := build
    build:
        echo 'Building!'

Just will show the alias along with the recipe:

    $ just --show b
    alias b := build
    build:
        echo 'Building!'
---
 src/justfile.rs      |  4 ++++
 src/run.rs           | 25 ++++++++++++++-----------
 tests/integration.rs |  2 +-
 3 files changed, 19 insertions(+), 12 deletions(-)

diff --git a/src/justfile.rs b/src/justfile.rs
index 288a9c6..6bf733e 100644
--- a/src/justfile.rs
+++ b/src/justfile.rs
@@ -141,6 +141,10 @@ impl<'a> Justfile<'a> where {
     Ok(())
   }
 
+  pub fn get_alias(&self, name: &str) -> Option<&Alias> {
+    self.aliases.get(name)
+  }
+
   pub fn get_recipe(&self, name: &str) -> Option<&Recipe<'a>> {
     if let Some(recipe) = self.recipes.get(name) {
       Some(recipe)
diff --git a/src/run.rs b/src/run.rs
index 13e205d..61324c6 100644
--- a/src/run.rs
+++ b/src/run.rs
@@ -446,18 +446,21 @@ pub fn run() {
   }
 
   if let Some(name) = matches.value_of("SHOW") {
-    match justfile.get_recipe(name) {
-      Some(recipe) => {
-        println!("{}", recipe);
-        process::exit(EXIT_SUCCESS);
-      }
-      None => {
-        eprintln!("Justfile does not contain recipe `{}`.", name);
-        if let Some(suggestion) = justfile.suggest(name) {
-          eprintln!("Did you mean `{}`?", suggestion);
-        }
-        process::exit(EXIT_FAILURE)
+    if let Some(alias) = justfile.get_alias(name) {
+      let recipe = justfile.get_recipe(alias.target).unwrap();
+      println!("{}", alias);
+      println!("{}", recipe);
+      process::exit(EXIT_SUCCESS);
+    }
+    if let Some(recipe) = justfile.get_recipe(name) {
+      println!("{}", recipe);
+      process::exit(EXIT_SUCCESS);
+    } else {
+      eprintln!("Justfile does not contain recipe `{}`.", name);
+      if let Some(suggestion) = justfile.suggest(name) {
+        eprintln!("Did you mean `{}`?", suggestion);
       }
+      process::exit(EXIT_FAILURE)
     }
   }
 
diff --git a/tests/integration.rs b/tests/integration.rs
index 76db1a4..5cd5df3 100644
--- a/tests/integration.rs
+++ b/tests/integration.rs
@@ -276,7 +276,7 @@ integration_test! {
   justfile: "foo:\n    bar\nalias f := foo",
   args: ("--show", "f"),
   stdin:  "",
-  stdout: "foo:
+  stdout: "alias f := foo\nfoo:
     bar
 ",
   stderr: "",