Shell: implement ‘!’ operator

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

2 files changed, 40 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:
+        !
diff --git a/test/script/shell.et b/test/script/shell.et
index e58dfea..086d3d3 100644
--- a/test/script/shell.et
+++ b/test/script/shell.et
@@ -154,3 +154,29 @@ test ShellExitOnError:
         expect /run-test-result Enabled failed/
         expect /run-done/
         flush
+
+
+test ShellLogic:
+    spawn as p
+    with p:
+        send "load ${scripts.path}/logic.et"
+        local:
+            expect /(load-.*)/ capture done
+            guard (done == "load-done")
+
+        send "run NegateFalse"
+        expect /run-test-result NegateFalse done/
+        expect /run-done/
+        flush
+
+        send "run NegateTrue"
+        expect /child-fail sh failed at: .*logic.et:9:9: ! true/
+        expect /run-test-result NegateTrue failed/
+        expect /run-done/
+        flush
+
+        send "run NegateNothing"
+        expect /child-fail sh failed at: .*logic.et:14:9: !/
+        expect /run-test-result NegateNothing failed/
+        expect /run-done/
+        flush