1 files changed, 58 insertions, 0 deletions
diff --git a/src/source_hierarchy.rs b/src/source_hierarchy.rs
new file mode 100644
index 0000000..9478c56
--- /dev/null
+++ b/src/source_hierarchy.rs
@@ -0,0 +1,58 @@
+use crate::*;
+
+use ansi::*;
+
+
+pub struct SourceHierarchy<'a> {
+    pub resolver: &'a Resolver,
+}
+
+impl<'a> SourceHierarchy<'a> {
+    pub fn report(&self) {
+        eprintln!(".");
+        let len = self.resolver.root_unit_ids.len();
+        for (i, id) in self.resolver.root_unit_ids.iter().enumerate() {
+            let end = i + 1 == len;
+            self.report_leaf(*id, Vec::new(), end);
+        }
+    }
+
+    fn report_leaf(&self, id: usize, mut levels: Vec<bool>, end: bool) {
+        // A level entry is true if all entries in that level have been printed.
+        for level in &levels {
+            match level {
+                false => eprint!("│   "),
+                true  => eprint!("    "),
+            }
+        }
+        // The end value is true if all siblings of this entry have been printed.
+        match end {
+                false => eprint!("├── "),
+                true  => eprint!("└── "),
+        }
+        if let Some(unit) = self.resolver.source_units.get(id) {
+            let path_str = &unit.source_unit.main.path.as_os_str().to_string_lossy();
+            if let Some(name_str) = unit.source_unit.name() {
+                eprint!("{name_str}{BLUE}");
+                if unit.source_unit.head.is_some() { eprint!(" +head") }
+                if unit.source_unit.tail.is_some() { eprint!(" +tail") }
+                let mut unresolved = 0;
+                for symbol in &self.resolver.unresolved {
+                    if symbol.source_id == id { unresolved += 1; }
+                }
+                if unresolved > 0 { eprint!("{RED} ({unresolved})"); }
+                eprintln!("{NORMAL} {DIM}({path_str}){NORMAL}");
+            } else {
+                eprintln!("{path_str}");
+            }
+            levels.push(end);
+            let len = unit.child_ids.len();
+            for (i, id) in unit.child_ids.iter().enumerate() {
+                let end = i + 1 == len;
+                self.report_leaf(*id, levels.clone(), end);
+            }
+        } else {
+            eprintln!("<error loading source unit details>");
+        }
+    }
+}