add a shell-pipe command

1 files changed, 15 insertions, 1 deletions

diff --git a/std.py b/std.py
index 1bb20d4..30d81c9 100644
--- a/std.py
+++ b/std.py
@@ -124,7 +124,19 @@ def std_literal_to_string(arg):
 # shell
 def std_shell(arg):
     assert isinstance(arg, NebString)
-    subprocess.run(arg.value)
+    lst = arg.value.split(" ")
+    subprocess.run(lst)
+    return NebBool(True)
+
+def std_shell_pipe(args):
+    prev = None
+    stdout = subprocess.PIPE
+    for idx, arg in enumerate(args.items):
+        if idx == len(args.items) - 1:
+            stdout = None
+        lst = arg.value.split(" ")
+        ret = subprocess.run(lst, stdout=stdout, input=prev)
+        prev = ret.stdout
     return NebBool(True)
 
 def evaluate_expression(expr):
@@ -229,5 +241,7 @@ def build_std():
     # shell
     shell_string = FuncImpl(NebFunction("$", [NebString], NebBool), std_shell)
     STD["$"] = [shell_string]
+    shell_pipe = FuncImpl(NebFunction("$|", [NebList], NebBool), std_shell_pipe)
+    STD["$|"] = [shell_pipe]
 
 build_std()