spec: simplify __str__ implementation (#23593)

The implementation for __str__ has been simplified to traverse the spec directly, 
and doesn't call anymore the flat_dependencies method. Dead code has been 
removed.

2 files changed, 10 insertions, 13 deletions

diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index 54ae03092e..aceceda081 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -3566,11 +3566,6 @@ class Spec(object):
         else:
             return any(s.satisfies(spec) for s in self.traverse(root=False))
 
-    def sorted_deps(self):
-        """Return a list of all dependencies sorted by name."""
-        deps = self.flat_dependencies()
-        return tuple(deps[name] for name in sorted(deps))
-
     def eq_dag(self, other, deptypes=True, vs=None, vo=None):
         """True if the full dependency DAGs of specs are equal."""
         if vs is None:
@@ -3880,7 +3875,9 @@ class Spec(object):
                 'Format string terminated while reading attribute.'
                 'Missing terminating }.'
             )
-        return out.getvalue()
+
+        formatted_spec = out.getvalue()
+        return formatted_spec.strip()
 
     def old_format(self, format_string='$_$@$%@+$+$=', **kwargs):
         """
@@ -4136,12 +4133,12 @@ class Spec(object):
         kwargs.setdefault('color', None)
         return self.format(*args, **kwargs)
 
-    def dep_string(self):
-        return ''.join(" ^" + dep.format() for dep in self.sorted_deps())
-
     def __str__(self):
-        ret = self.format() + self.dep_string()
-        return ret.strip()
+        sorted_nodes = [self] + sorted(
+            self.traverse(root=False), key=lambda x: x.name
+        )
+        spec_str = " ^".join(d.format() for d in sorted_nodes)
+        return spec_str.strip()
 
     def install_status(self):
         """Helper for tree to print DB install status."""
diff --git a/lib/spack/spack/test/spec_semantics.py b/lib/spack/spack/test/spec_semantics.py
index 9fb5eaf2b6..16a4cf77ce 100644
--- a/lib/spack/spack/test/spec_semantics.py
+++ b/lib/spack/spack/test/spec_semantics.py
@@ -776,7 +776,7 @@ class TestSpecSematics(object):
         sigil_package_segments = [("{@VERSIONS}", '@' + str(spec.version)),
                                   ("{%compiler}", '%' + str(spec.compiler)),
                                   ("{arch=architecture}",
-                                   ' arch=' + str(spec.architecture))]
+                                   'arch=' + str(spec.architecture))]
 
         compiler_segments = [("{compiler.name}", "name"),
                              ("{compiler.version}", "versions")]
@@ -798,7 +798,7 @@ class TestSpecSematics(object):
         for named_str, prop in package_segments:
             expected = getattr(spec, prop, "")
             actual = spec.format(named_str)
-            assert str(expected) == actual
+            assert str(expected).strip() == actual
 
         for named_str, expected in sigil_package_segments:
             actual = spec.format(named_str)