Add a --hold command line option to stay open after the child process exits

Fixes #667

__main__.py

@@ -26,6 +26,13 @@ def runpy(args):
     exec(args[1])
 
 
+def hold(args):
+    import subprocess
+    ret = subprocess.Popen(args[1:]).wait()
+    sys.stdin.read()
+    raise SystemExit(ret)
+
+
 def launch(args):
     import runpy
     sys.argv = args[1:]
@@ -61,6 +68,7 @@ entry_points = {
     '+': namespaced,
 }
 namespaced_entry_points = {k: v for k, v in entry_points.items() if k[0] not in '+@'}
+namespaced_entry_points['hold'] = hold
 
 
 def setup_openssl_environment():

kitty/cli.py

@@ -76,6 +76,12 @@ Path to a file containing the startup :italic:`session` (tabs, windows, layout,
 See the README file for details and an example.
 
 
+--hold
+type=bool-set
+Remain open after child process exits. Note that this only affects the first
+window. You can quit by either using the close window shortcut or :kbd:`Ctrl+d`.
+
+
 --single-instance -1
 type=bool-set
 If specified only a single instance of :italic:`{appname}` will run. New invocations will
@@ -213,6 +219,10 @@ def code(x):
     return x
 
 
+def kbd(x):
+    return x
+
+
 def env(x):
     return italic(x)
 

kitty/session.py

@@ -124,6 +124,8 @@ def create_session(opts, args=None, special_window=None, cwd_from=None, respect_
     ans.tabs[-1].layout = current_layout
     if special_window is None:
         cmd = args.args if args and args.args else resolved_shell(opts)
+        if args.hold:
+            cmd = ['kitty', '+hold'] + cmd
         from kitty.tabs import SpecialWindow
         k = {'cwd_from': cwd_from}
         if respect_cwd: