add support for --class, --title and -e

[formula-spectre]

title. it would be handy to have them like every other terminal. -c and -t can be used to set a terminal class and name to facilitate finding, like making scratchpad sessions and make just them transparent with picom. -e is self explanatory, to have something executes as soon as termonad start.

[cdepillabout]

It looks like xterm supports these arguments.

Here's a little more information about the arguments.

• The xterm man page has an explanation of -class and -title:

  -class string
      This option allows you to override xterm's resource class.  Normally it is "XTerm", but can be set
      to another class such as "UXTerm" to override selected resources.
  
      X Toolkit sets the WM_CLASS property using the instance name and this class value.
  
  -title string
      This option specifies the window title string, which may be displayed by window managers if the
      user so chooses.  It is shorthand for specifying the "title" resource.  The default title is the
      command line specified after the -e option, if any, otherwise the application name.
  
      X Toolkit sets the WM_NAME property using this value.
  

  A couple points:

  • It is completely unrelated, but I actually have some Rust code that inspects the WM_NAME and WM_CLASS properties of all your currently open windows. I imagine this would be a good resource for someone trying to add functionality to Termonad for setting the WM_NAME and WM_CLASS: https://github.com/cdepillabout/break-time/blob/6c5e7d9a9d8b2213fbdde35edd9b65423e19470c/src/scheduler/plugins/window_titles.rs#L29-L37

  • Termonad currently sets the name (or maybe the class??) to Termonad:

    termonad/src/Termonad/App.hs

    Line 514 in cf40fec

    windowSetTitle win "Termonad"

  • Ideally we wouldn't use XLib calls for this directly, since I want Termonad to work on both X11 and Wayland. We should try to use functionality exposed by GTK or GLib or whatever for this.

• Here's the man page for xterm for -e:

  -e program [ arguments ... ]
      This option specifies the program (and its command line arguments) to be run in the
      xterm window.  It also sets the window title and icon name to be the basename of the
      program being executed if neither -T nor -n are given on the command line.
  
      NOTE: This must be the last option on the command line.
  

  Termonad currently looks for the SHELL environment variable to determine what to run in a newly opened window:

  termonad/src/Termonad/Term.hs

  Lines 376 to 379 in cf40fec

  	-- Should probably use GI.Vte.Functions.getUserShell, but contrary to its
  	-- documentation it raises an exception rather wrap in Maybe.
  	mShell <- lookupEnv "SHELL"
  	let argv = maybe ["/usr/bin/env", "bash"] pure mShell

  It would be nice to change this to be specified by the user in the Temonad Config.

• Ideally we would add the above settings to the actual Termonad Config, and not just take them on the command line: https://hackage.haskell.org/package/termonad-4.2.0.0/docs/Termonad-Config.html. There is an issue open about taking argument on the command line: take arguments on the command line #81

[refaelsh]

+1 for the -e option please.

[cdepillabout]

There is more specific information about this in #81 (comment).