Start working on --tree

3 files changed, 39 insertions, 0 deletions

diff --git a/README.md b/README.md
index b65fccfb..5e065510 100644
--- a/README.md
+++ b/README.md
@@ -360,6 +360,9 @@ command-line interface.
 This does not, however, preclude fixing outright bugs, even if doing so might
 break `justfiles` that rely on their behavior.
 
+Also, output of `just` which is human readable, such as error messages and the
+output of `--list`, is not bound by the backwards compatibility guarantee.
+
 There will never be a `just` 2.0. Any desirable backwards-incompatible changes
 will be opt-in on a per-`justfile` basis, so users may migrate at their
 leisure.
diff --git a/src/config.rs b/src/config.rs
index 0a071463..d1fbd132 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -56,6 +56,7 @@ mod cmd {
   pub(crate) const LIST: &str = "LIST";
   pub(crate) const SHOW: &str = "SHOW";
   pub(crate) const SUMMARY: &str = "SUMMARY";
+  pub(crate) const TREE: &str = "TREE";
   pub(crate) const VARIABLES: &str = "VARIABLES";
 
   pub(crate) const ALL: &[&str] = &[
@@ -71,6 +72,7 @@ mod cmd {
     LIST,
     SHOW,
     SUMMARY,
+    TREE,
     VARIABLES,
   ];
 
@@ -84,6 +86,7 @@ mod cmd {
     LIST,
     SHOW,
     SUMMARY,
+    TREE,
     VARIABLES,
   ];
 }
@@ -382,6 +385,11 @@ impl Config {
           .help("List names of available recipes"),
       )
       .arg(
+        Arg::with_name(cmd::TREE)
+          .long("tree")
+          .help("Show tree of available recipes"),
+      )
+      .arg(
         Arg::with_name(cmd::VARIABLES)
           .long("variables")
           .help("List names of variables"),
@@ -611,6 +619,8 @@ impl Config {
         variable: positional.arguments.into_iter().next(),
         overrides,
       }
+    } else if matches.is_present(cmd::TREE) {
+      Subcommand::Tree
     } else if matches.is_present(cmd::VARIABLES) {
       Subcommand::Variables
     } else {
diff --git a/src/subcommand.rs b/src/subcommand.rs
index 8dbcbaea..c90a90af 100644
--- a/src/subcommand.rs
+++ b/src/subcommand.rs
@@ -34,6 +34,7 @@ pub(crate) enum Subcommand {
     name: String,
   },
   Summary,
+  Tree,
   Variables,
 }
 
@@ -82,6 +83,7 @@ impl Subcommand {
       List => Self::list(config, 0, justfile),
       Show { ref name } => Self::show(config, name, justfile)?,
       Summary => Self::summary(config, justfile),
+      Tree => Self::tree(justfile),
       Variables => Self::variables(justfile),
       Changelog | Completions { .. } | Edit | Init | Run { .. } => unreachable!(),
     }
@@ -569,6 +571,30 @@ impl Subcommand {
     }
   }
 
+  fn tree(justfile: &Justfile) {
+    for (i, (name, recipe)) in justfile.recipes.iter().enumerate() {
+      if recipe.is_public() {
+        if i == justfile.recipes.len() - 1 {
+          print!("└── ");
+        } else {
+          print!("├── ");
+        }
+
+        println!("{name}");
+
+        for (i, dependency) in recipe.dependencies.iter().enumerate() {
+          if i == recipe.dependencies.len() - 1 {
+            print!("│   └── ");
+          } else {
+            print!("│   ├── ");
+          }
+
+          println!("{}", dependency.recipe.name());
+        }
+      }
+    }
+  }
+
   fn variables(justfile: &Justfile) {
     for (i, (_, assignment)) in justfile.assignments.iter().enumerate() {
       if i > 0 {