Shell: Add support for special parameter that expands to return-code …

…of last program executed
luteresa · Sep 10, 2019 · 91a609d · 91a609d
1 parent 2bd181a
commit 91a609d
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diff --git a/Shell/GlobalState.h b/Shell/GlobalState.h
@@ -14,6 +14,7 @@ struct GlobalState {
  struct termios termios;
  bool was_interrupted { false };
  bool was_resized { false };
+ int last_return_code { 0 };
 };
 
 extern GlobalState g;
diff --git a/Shell/main.cpp b/Shell/main.cpp
@@ -307,6 +307,8 @@ static Vector<String> expand_parameters(const StringView& param)
  return { param };
 
  String variable_name = String(param.substring_view(1, param.length() - 1));
+ if (variable_name == "?")
+ return { String::number(g.last_return_code) };
 
  char* env_value = getenv(variable_name.characters());
  if (env_value == nullptr)
@@ -546,6 +548,8 @@ static int run_command(const String& cmd)
  }
  }
 
+ g.last_return_code = return_value;
+
  // FIXME: Should I really have to tcsetpgrp() after my child has exited?
  // Is the terminal controlling pgrp really still the PGID of the dead process?
  tcsetpgrp(0, getpid());