LibLinEdit + Shell: handle signals

This allows the LineEditor to get notified about signals, since we
cannot set signal handlers in a clean way within the LineEditor
instance.

Libraries/LibLineEdit/LineEditor.cpp

@@ -42,14 +42,8 @@ LineEditor::LineEditor(struct termios termios)
 }
 
 LineEditor::LineEditor()
-    : m_termios({})
+    : LineEditor(termios {})
-    , m_initialized(false)
 {
-    struct winsize ws;
-    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) < 0)
-        m_num_columns = 80;
-    else
-        m_num_columns = ws.ws_col;
 }
 
 LineEditor::~LineEditor()

Libraries/LibLineEdit/LineEditor.h

@@ -70,7 +70,11 @@ public:
 
     Function<Vector<String>(const String&)> on_tab_complete_first_token = nullptr;
     Function<Vector<String>(const String&)> on_tab_complete_other_token = nullptr;
-    // FIXME: figure out signals
+
+    // FIXME: we will have to kindly ask our instantiators to set our signal handlers
+    // since we can not do this cleanly ourselves (signal() limitation: cannot give member functions)
+    void interrupted() { m_was_interrupted = true; }
+    void resized() { m_was_resized = true; }
 
     size_t cursor() const { return m_cursor; }
     const Vector<char, 1024>& buffer() const { return m_buffer; }

Shell/main.cpp

@@ -1154,14 +1154,16 @@ int main(int argc, char** argv)
 
     signal(SIGINT, [](int) {
         g.was_interrupted = true;
-    });
+        editor.interrupted();
-
-    signal(SIGHUP, [](int) {
-        save_history();
     });
 
     signal(SIGWINCH, [](int) {
         g.was_resized = true;
+        editor.resized();
+    });
+
+    signal(SIGHUP, [](int) {
+        save_history();
     });
 
     int rc = gethostname(g.hostname, sizeof(g.hostname));