Shell: implement ‘!’ operator

Changelog: Implement negation using the `!` operator in the shell interpreter.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/asset/shell/logic.et b/test/asset/shell/logic.et
new file mode 100644
index 0000000..d1d4b32
--- /dev/null
+++ b/test/asset/shell/logic.et
@@ -0,0 +1,14 @@
+test NegateFalse:
+    node n
+    shell on n as sh:
+        ! false
+
+test NegateTrue:
+    node n
+    shell on n as sh:
+        ! true
+
+test NegateNothing:
+    node n
+    shell on n as sh:
+        !